NORTHWEST NATURAL GAS COMPANY has sponsored the creation of one or more 401k plans.
Submission information for form 5500 for 401k plan RETIREMENT PLAN FOR BARGAINING UNIT AND NON-BARGAINING UNIT EMPLOYEES OF NORTHWEST NATURAL GAS COMPANY EMPLOYEES
401k plan membership statisitcs for RETIREMENT PLAN FOR BARGAINING UNIT AND NON-BARGAINING UNIT EMPLOYEES OF NORTHWEST NATURAL GAS COMPANY EMPLOYEES
| Measure | Date | Value |
|---|
| 2023: RETIREMENT PLAN FOR BARGAINING UNIT AND NON-BARGAINING UNIT EMPLOYEES OF NORTHWEST NATURAL GAS COMPANY EMPLOYEES 2023 401k membership |
|---|
| Total participants, beginning-of-year | 2023-01-01 | 1,563 |
| Total number of active participants reported on line 7a of the Form 5500 | 2023-01-01 | 311 |
| Number of retired or separated participants receiving benefits | 2023-01-01 | 941 |
| Number of other retired or separated participants entitled to future benefits | 2023-01-01 | 178 |
| Total of all active and inactive participants | 2023-01-01 | 1,430 |
| Number of deceased participants whose beneficiaries are receiving or are entitled to receive benefits | 2023-01-01 | 106 |
| Total participants | 2023-01-01 | 1,536 |
| Number of participants with account balances | 2023-01-01 | 0 |
| 2022: RETIREMENT PLAN FOR BARGAINING UNIT AND NON-BARGAINING UNIT EMPLOYEES OF NORTHWEST NATURAL GAS COMPANY EMPLOYEES 2022 401k membership |
|---|
| Market value of plan assets | 2022-12-31 | 399,216,435 |
| Acturial value of plan assets | 2022-12-31 | 375,421,753 |
| Funding target for retired participants and beneficiaries receiving payment | 2022-12-31 | 223,798,630 |
| Number of terminated vested participants | 2022-12-31 | 186 |
| Fundng target for terminated vested participants | 2022-12-31 | 19,242,345 |
| Active participant vested funding target | 2022-12-31 | 102,820,223 |
| Number of active participants | 2022-12-31 | 407 |
| Total funding liabilities for active participants | 2022-12-31 | 105,052,394 |
| Total participant count | 2022-12-31 | 1,611 |
| Total funding target for all participants | 2022-12-31 | 348,093,369 |
| Balance at beginning of prior year after applicable adjustments | 2022-12-31 | 0 |
| Prefunding balance at beginning of prior year after applicable adjustments | 2022-12-31 | 8,436,350 |
| Carryover balanced portion elected for use to offset prior years funding requirement | 2022-12-31 | 0 |
| Prefunding balanced used to offset prior years funding requirement | 2022-12-31 | 7,304,142 |
| Amount remaining of carryover balance | 2022-12-31 | 0 |
| Amount remaining of prefunding balance | 2022-12-31 | 1,132,208 |
| Present value of excess contributions | 2022-12-31 | 2,893,796 |
| Total available prior years excess cotributions available at beginning of current plan year to add to prefunding balance | 2022-12-31 | 3,208,062 |
| Total available prior years excess cotributions added at beginning of current plan year to add to prefunding balance | 2022-12-31 | 3,208,062 |
| Reductions in caryover balances due to elections or deemed elections | 2022-12-31 | 0 |
| Reductions in prefunding balances due to elections or deemed elections | 2022-12-31 | 0 |
| Balance of carryovers at beginning of current year | 2022-12-31 | 0 |
| Balance of prefunding at beginning of current year | 2022-12-31 | 4,463,228 |
| Total employer contributions | 2022-12-31 | 0 |
| Total employee contributions | 2022-12-31 | 0 |
| Contributions allocated toward unpaid minimum require contributions from prior years | 2022-12-31 | 0 |
| Contributions made to avoid restrictions adjusted to valuation date | 2022-12-31 | 0 |
| Contributions allocated toward minimum required contributions for current year adjusted to valuation date | 2022-12-31 | 0 |
| Liquidity shortfalls end of Q1 | 2022-12-31 | 0 |
| Liquidity shortfalls end of Q2 | 2022-12-31 | 0 |
| Liquidity shortfalls end of Q3 | 2022-12-31 | 0 |
| Liquidity shortfalls end of Q4 | 2022-12-31 | 0 |
| Unpaid minimum required contributions for all prior years | 2022-12-31 | 0 |
| iDiscounted employer contributions allocated toward unpaid minimum required contributions from prior years | 2022-12-31 | 0 |
| Remaining amount of unpaid minimum required contributions | 2022-12-31 | 0 |
| Minimum required contributions for current year target normal cost | 2022-12-31 | 8,201,288 |
| Net shortfall amortization installment of oustanding balance | 2022-12-31 | 0 |
| Waiver amortization installment | 2022-12-31 | 0 |
| Total funding amount beforereflecting carryover/prefunding balances | 2022-12-31 | 0 |
| Carryover balance elected to use to offset funding requirement | 2022-12-31 | 0 |
| Prefunding balance elected to use to offset funding requirement | 2022-12-31 | 0 |
| Additional cash requirement | 2022-12-31 | 0 |
| Contributions allocatedtoward minimum required contributions for current year | 2022-12-31 | 0 |
| Unpaid minimum required contributions for current year | 2022-12-31 | 0 |
| Unpaid minimum required contributions for all years | 2022-12-31 | 0 |
| Total participants, beginning-of-year | 2022-01-01 | 1,593 |
| Total number of active participants reported on line 7a of the Form 5500 | 2022-01-01 | 346 |
| Number of retired or separated participants receiving benefits | 2022-01-01 | 931 |
| Number of other retired or separated participants entitled to future benefits | 2022-01-01 | 186 |
| Total of all active and inactive participants | 2022-01-01 | 1,463 |
| Number of deceased participants whose beneficiaries are receiving or are entitled to receive benefits | 2022-01-01 | 100 |
| Total participants | 2022-01-01 | 1,563 |
| Number of participants with account balances | 2022-01-01 | 0 |
| Participants that terminated employment during the plan year with accrued benefits that were less than 100% vested | 2022-01-01 | 0 |
| 2021: RETIREMENT PLAN FOR BARGAINING UNIT AND NON-BARGAINING UNIT EMPLOYEES OF NORTHWEST NATURAL GAS COMPANY EMPLOYEES 2021 401k membership |
|---|
| Market value of plan assets | 2021-12-31 | 378,461,226 |
| Acturial value of plan assets | 2021-12-31 | 340,615,104 |
| Funding target for retired participants and beneficiaries receiving payment | 2021-12-31 | 213,704,854 |
| Number of terminated vested participants | 2021-12-31 | 182 |
| Fundng target for terminated vested participants | 2021-12-31 | 16,966,415 |
| Active participant vested funding target | 2021-12-31 | 107,343,531 |
| Number of active participants | 2021-12-31 | 457 |
| Total funding liabilities for active participants | 2021-12-31 | 109,587,759 |
| Total participant count | 2021-12-31 | 1,634 |
| Total funding target for all participants | 2021-12-31 | 340,259,028 |
| Balance at beginning of prior year after applicable adjustments | 2021-12-31 | 0 |
| Prefunding balance at beginning of prior year after applicable adjustments | 2021-12-31 | 0 |
| Carryover balanced portion elected for use to offset prior years funding requirement | 2021-12-31 | 0 |
| Prefunding balanced used to offset prior years funding requirement | 2021-12-31 | 0 |
| Amount remaining of carryover balance | 2021-12-31 | 0 |
| Amount remaining of prefunding balance | 2021-12-31 | 0 |
| Present value of excess contributions | 2021-12-31 | 7,979,900 |
| Total available prior years excess cotributions available at beginning of current plan year to add to prefunding balance | 2021-12-31 | 8,436,350 |
| Total available prior years excess cotributions added at beginning of current plan year to add to prefunding balance | 2021-12-31 | 8,436,350 |
| Reductions in caryover balances due to elections or deemed elections | 2021-12-31 | 0 |
| Reductions in prefunding balances due to elections or deemed elections | 2021-12-31 | 0 |
| Balance of carryovers at beginning of current year | 2021-12-31 | 0 |
| Balance of prefunding at beginning of current year | 2021-12-31 | 8,436,350 |
| Total employer contributions | 2021-12-31 | 5,050,000 |
| Total employee contributions | 2021-12-31 | 0 |
| Contributions allocated toward unpaid minimum require contributions from prior years | 2021-12-31 | 0 |
| Contributions made to avoid restrictions adjusted to valuation date | 2021-12-31 | 0 |
| Contributions allocated toward minimum required contributions for current year adjusted to valuation date | 2021-12-31 | 4,972,605 |
| Liquidity shortfalls end of Q1 | 2021-12-31 | 0 |
| Liquidity shortfalls end of Q2 | 2021-12-31 | 0 |
| Liquidity shortfalls end of Q3 | 2021-12-31 | 0 |
| Liquidity shortfalls end of Q4 | 2021-12-31 | 0 |
| Unpaid minimum required contributions for all prior years | 2021-12-31 | 0 |
| iDiscounted employer contributions allocated toward unpaid minimum required contributions from prior years | 2021-12-31 | 0 |
| Remaining amount of unpaid minimum required contributions | 2021-12-31 | 0 |
| Minimum required contributions for current year target normal cost | 2021-12-31 | 8,521,587 |
| Net shortfall amortization installment of oustanding balance | 2021-12-31 | 8,080,274 |
| Waiver amortization installment | 2021-12-31 | 0 |
| Total funding amount beforereflecting carryover/prefunding balances | 2021-12-31 | 9,382,951 |
| Carryover balance elected to use to offset funding requirement | 2021-12-31 | 0 |
| Prefunding balance elected to use to offset funding requirement | 2021-12-31 | 7,304,142 |
| Additional cash requirement | 2021-12-31 | 2,078,809 |
| Contributions allocatedtoward minimum required contributions for current year | 2021-12-31 | 4,972,605 |
| Unpaid minimum required contributions for current year | 2021-12-31 | 0 |
| Unpaid minimum required contributions for all years | 2021-12-31 | 0 |
| Total participants, beginning-of-year | 2021-01-01 | 1,620 |
| Total number of active participants reported on line 7a of the Form 5500 | 2021-01-01 | 407 |
| Number of retired or separated participants receiving benefits | 2021-01-01 | 904 |
| Number of other retired or separated participants entitled to future benefits | 2021-01-01 | 184 |
| Total of all active and inactive participants | 2021-01-01 | 1,495 |
| Number of deceased participants whose beneficiaries are receiving or are entitled to receive benefits | 2021-01-01 | 98 |
| Total participants | 2021-01-01 | 1,593 |
| Participants that terminated employment during the plan year with accrued benefits that were less than 100% vested | 2021-01-01 | 0 |
| 2020: RETIREMENT PLAN FOR BARGAINING UNIT AND NON-BARGAINING UNIT EMPLOYEES OF NORTHWEST NATURAL GAS COMPANY EMPLOYEES 2020 401k membership |
|---|
| Market value of plan assets | 2020-12-31 | 325,725,535 |
| Acturial value of plan assets | 2020-12-31 | 305,863,194 |
| Funding target for retired participants and beneficiaries receiving payment | 2020-12-31 | 204,349,614 |
| Number of terminated vested participants | 2020-12-31 | 183 |
| Fundng target for terminated vested participants | 2020-12-31 | 16,877,165 |
| Active participant vested funding target | 2020-12-31 | 107,661,266 |
| Number of active participants | 2020-12-31 | 503 |
| Total funding liabilities for active participants | 2020-12-31 | 110,249,166 |
| Total participant count | 2020-12-31 | 1,646 |
| Total funding target for all participants | 2020-12-31 | 331,475,945 |
| Balance at beginning of prior year after applicable adjustments | 2020-12-31 | 0 |
| Prefunding balance at beginning of prior year after applicable adjustments | 2020-12-31 | 0 |
| Carryover balanced portion elected for use to offset prior years funding requirement | 2020-12-31 | 0 |
| Prefunding balanced used to offset prior years funding requirement | 2020-12-31 | 0 |
| Amount remaining of carryover balance | 2020-12-31 | 0 |
| Amount remaining of prefunding balance | 2020-12-31 | 0 |
| Present value of excess contributions | 2020-12-31 | 3,753 |
| Total available prior years excess cotributions available at beginning of current plan year to add to prefunding balance | 2020-12-31 | 3,960 |
| Reductions in caryover balances due to elections or deemed elections | 2020-12-31 | 0 |
| Reductions in prefunding balances due to elections or deemed elections | 2020-12-31 | 0 |
| Balance of carryovers at beginning of current year | 2020-12-31 | 0 |
| Balance of prefunding at beginning of current year | 2020-12-31 | 0 |
| Total employer contributions | 2020-12-31 | 20,470,000 |
| Total employee contributions | 2020-12-31 | 0 |
| Contributions allocated toward unpaid minimum require contributions from prior years | 2020-12-31 | 0 |
| Contributions made to avoid restrictions adjusted to valuation date | 2020-12-31 | 0 |
| Contributions allocated toward minimum required contributions for current year adjusted to valuation date | 2020-12-31 | 19,747,928 |
| Liquidity shortfalls end of Q1 | 2020-12-31 | 0 |
| Liquidity shortfalls end of Q2 | 2020-12-31 | 0 |
| Liquidity shortfalls end of Q3 | 2020-12-31 | 0 |
| Liquidity shortfalls end of Q4 | 2020-12-31 | 0 |
| Unpaid minimum required contributions for all prior years | 2020-12-31 | 0 |
| iDiscounted employer contributions allocated toward unpaid minimum required contributions from prior years | 2020-12-31 | 0 |
| Remaining amount of unpaid minimum required contributions | 2020-12-31 | 0 |
| Minimum required contributions for current year target normal cost | 2020-12-31 | 9,363,332 |
| Net shortfall amortization installment of oustanding balance | 2020-12-31 | 25,612,751 |
| Waiver amortization installment | 2020-12-31 | 0 |
| Total funding amount beforereflecting carryover/prefunding balances | 2020-12-31 | 11,768,028 |
| Additional cash requirement | 2020-12-31 | 11,768,028 |
| Contributions allocatedtoward minimum required contributions for current year | 2020-12-31 | 19,747,928 |
| Unpaid minimum required contributions for current year | 2020-12-31 | 0 |
| Unpaid minimum required contributions for all years | 2020-12-31 | 0 |
| Total participants, beginning-of-year | 2020-01-01 | 1,631 |
| Total number of active participants reported on line 7a of the Form 5500 | 2020-01-01 | 457 |
| Number of retired or separated participants receiving benefits | 2020-01-01 | 881 |
| Number of other retired or separated participants entitled to future benefits | 2020-01-01 | 179 |
| Total of all active and inactive participants | 2020-01-01 | 1,517 |
| Number of deceased participants whose beneficiaries are receiving or are entitled to receive benefits | 2020-01-01 | 103 |
| Total participants | 2020-01-01 | 1,620 |
| Participants that terminated employment during the plan year with accrued benefits that were less than 100% vested | 2020-01-01 | 0 |
| 2019: RETIREMENT PLAN FOR BARGAINING UNIT AND NON-BARGAINING UNIT EMPLOYEES OF NORTHWEST NATURAL GAS COMPANY EMPLOYEES 2019 401k membership |
|---|
| Market value of plan assets | 2019-12-31 | 259,283,301 |
| Acturial value of plan assets | 2019-12-31 | 279,276,418 |
| Funding target for retired participants and beneficiaries receiving payment | 2019-12-31 | 193,598,391 |
| Number of terminated vested participants | 2019-12-31 | 190 |
| Fundng target for terminated vested participants | 2019-12-31 | 18,409,865 |
| Active participant vested funding target | 2019-12-31 | 117,019,027 |
| Number of active participants | 2019-12-31 | 562 |
| Total funding liabilities for active participants | 2019-12-31 | 119,845,354 |
| Total participant count | 2019-12-31 | 1,657 |
| Total funding target for all participants | 2019-12-31 | 331,853,610 |
| Balance at beginning of prior year after applicable adjustments | 2019-12-31 | 0 |
| Prefunding balance at beginning of prior year after applicable adjustments | 2019-12-31 | 0 |
| Carryover balanced portion elected for use to offset prior years funding requirement | 2019-12-31 | 0 |
| Prefunding balanced used to offset prior years funding requirement | 2019-12-31 | 0 |
| Amount remaining of carryover balance | 2019-12-31 | 0 |
| Amount remaining of prefunding balance | 2019-12-31 | 0 |
| Present value of excess contributions | 2019-12-31 | 5,738 |
| Total available prior years excess cotributions available at beginning of current plan year to add to prefunding balance | 2019-12-31 | 6,064 |
| Total available prior years excess cotributions added at beginning of current plan year to add to prefunding balance | 2019-12-31 | 0 |
| Reductions in caryover balances due to elections or deemed elections | 2019-12-31 | 0 |
| Reductions in prefunding balances due to elections or deemed elections | 2019-12-31 | 0 |
| Balance of carryovers at beginning of current year | 2019-12-31 | 0 |
| Balance of prefunding at beginning of current year | 2019-12-31 | 0 |
| Total employer contributions | 2019-12-31 | 22,530,000 |
| Total employee contributions | 2019-12-31 | 0 |
| Contributions allocated toward unpaid minimum require contributions from prior years | 2019-12-31 | 0 |
| Contributions made to avoid restrictions adjusted to valuation date | 2019-12-31 | 0 |
| Contributions allocated toward minimum required contributions for current year adjusted to valuation date | 2019-12-31 | 21,225,090 |
| Liquidity shortfalls end of Q1 | 2019-12-31 | 0 |
| Liquidity shortfalls end of Q2 | 2019-12-31 | 0 |
| Liquidity shortfalls end of Q3 | 2019-12-31 | 0 |
| Liquidity shortfalls end of Q4 | 2019-12-31 | 0 |
| Unpaid minimum required contributions for all prior years | 2019-12-31 | 0 |
| iDiscounted employer contributions allocated toward unpaid minimum required contributions from prior years | 2019-12-31 | 0 |
| Remaining amount of unpaid minimum required contributions | 2019-12-31 | 0 |
| Minimum required contributions for current year target normal cost | 2019-12-31 | 9,897,497 |
| Net shortfall amortization installment of oustanding balance | 2019-12-31 | 52,577,192 |
| Waiver amortization installment | 2019-12-31 | 0 |
| Total funding amount beforereflecting carryover/prefunding balances | 2019-12-31 | 21,221,337 |
| Carryover balance elected to use to offset funding requirement | 2019-12-31 | 0 |
| Prefunding balance elected to use to offset funding requirement | 2019-12-31 | 0 |
| Additional cash requirement | 2019-12-31 | 21,221,337 |
| Contributions allocatedtoward minimum required contributions for current year | 2019-12-31 | 21,225,090 |
| Unpaid minimum required contributions for current year | 2019-12-31 | 0 |
| Unpaid minimum required contributions for all years | 2019-12-31 | 0 |
| Total participants, beginning-of-year | 2019-01-01 | 1,643 |
| Total number of active participants reported on line 7a of the Form 5500 | 2019-01-01 | 503 |
| Number of retired or separated participants receiving benefits | 2019-01-01 | 854 |
| Number of other retired or separated participants entitled to future benefits | 2019-01-01 | 178 |
| Total of all active and inactive participants | 2019-01-01 | 1,535 |
| Number of deceased participants whose beneficiaries are receiving or are entitled to receive benefits | 2019-01-01 | 6 |
| Total participants | 2019-01-01 | 1,541 |
| Participants that terminated employment during the plan year with accrued benefits that were less than 100% vested | 2019-01-01 | 0 |
| 2018: RETIREMENT PLAN FOR BARGAINING UNIT AND NON-BARGAINING UNIT EMPLOYEES OF NORTHWEST NATURAL GAS COMPANY EMPLOYEES 2018 401k membership |
|---|
| Market value of plan assets | 2018-12-31 | 291,821,098 |
| Acturial value of plan assets | 2018-12-31 | 275,824,618 |
| Funding target for retired participants and beneficiaries receiving payment | 2018-12-31 | 181,358,034 |
| Number of terminated vested participants | 2018-12-31 | 191 |
| Fundng target for terminated vested participants | 2018-12-31 | 17,609,420 |
| Active participant vested funding target | 2018-12-31 | 109,394,681 |
| Number of active participants | 2018-12-31 | 598 |
| Total funding liabilities for active participants | 2018-12-31 | 112,226,649 |
| Total participant count | 2018-12-31 | 1,670 |
| Total funding target for all participants | 2018-12-31 | 311,194,103 |
| Balance at beginning of prior year after applicable adjustments | 2018-12-31 | 0 |
| Prefunding balance at beginning of prior year after applicable adjustments | 2018-12-31 | 0 |
| Carryover balanced portion elected for use to offset prior years funding requirement | 2018-12-31 | 0 |
| Prefunding balanced used to offset prior years funding requirement | 2018-12-31 | 0 |
| Amount remaining of carryover balance | 2018-12-31 | 0 |
| Amount remaining of prefunding balance | 2018-12-31 | 0 |
| Present value of excess contributions | 2018-12-31 | 19,101 |
| Total available prior years excess cotributions available at beginning of current plan year to add to prefunding balance | 2018-12-31 | 20,222 |
| Total available prior years excess cotributions added at beginning of current plan year to add to prefunding balance | 2018-12-31 | 0 |
| Reductions in caryover balances due to elections or deemed elections | 2018-12-31 | 0 |
| Reductions in prefunding balances due to elections or deemed elections | 2018-12-31 | 0 |
| Balance of carryovers at beginning of current year | 2018-12-31 | 0 |
| Balance of prefunding at beginning of current year | 2018-12-31 | 0 |
| Total employer contributions | 2018-12-31 | 13,040,000 |
| Total employee contributions | 2018-12-31 | 0 |
| Contributions allocated toward minimum required contributions for current year adjusted to valuation date | 2018-12-31 | 12,623,449 |
| Liquidity shortfalls end of Q1 | 2018-12-31 | 0 |
| Liquidity shortfalls end of Q2 | 2018-12-31 | 0 |
| Liquidity shortfalls end of Q3 | 2018-12-31 | 0 |
| Liquidity shortfalls end of Q4 | 2018-12-31 | 0 |
| Unpaid minimum required contributions for all prior years | 2018-12-31 | 0 |
| Remaining amount of unpaid minimum required contributions | 2018-12-31 | 0 |
| Minimum required contributions for current year target normal cost | 2018-12-31 | 9,078,215 |
| Net shortfall amortization installment of oustanding balance | 2018-12-31 | 35,369,485 |
| Waiver amortization installment | 2018-12-31 | 0 |
| Total funding amount beforereflecting carryover/prefunding balances | 2018-12-31 | 12,617,711 |
| Carryover balance elected to use to offset funding requirement | 2018-12-31 | 0 |
| Prefunding balance elected to use to offset funding requirement | 2018-12-31 | 0 |
| Additional cash requirement | 2018-12-31 | 12,617,711 |
| Contributions allocatedtoward minimum required contributions for current year | 2018-12-31 | 12,623,449 |
| Unpaid minimum required contributions for current year | 2018-12-31 | 0 |
| Unpaid minimum required contributions for all years | 2018-12-31 | 0 |
| Total participants, beginning-of-year | 2018-01-01 | 1,660 |
| Total number of active participants reported on line 7a of the Form 5500 | 2018-01-01 | 561 |
| Number of retired or separated participants receiving benefits | 2018-01-01 | 820 |
| Number of other retired or separated participants entitled to future benefits | 2018-01-01 | 172 |
| Total of all active and inactive participants | 2018-01-01 | 1,553 |
| Number of deceased participants whose beneficiaries are receiving or are entitled to receive benefits | 2018-01-01 | 103 |
| Total participants | 2018-01-01 | 1,656 |
| Participants that terminated employment during the plan year with accrued benefits that were less than 100% vested | 2018-01-01 | 0 |
| 2017: RETIREMENT PLAN FOR BARGAINING UNIT AND NON-BARGAINING UNIT EMPLOYEES OF NORTHWEST NATURAL GAS COMPANY EMPLOYEES 2017 401k membership |
|---|
| Market value of plan assets | 2017-12-31 | 264,880,591 |
| Acturial value of plan assets | 2017-12-31 | 275,221,280 |
| Funding target for retired participants and beneficiaries receiving payment | 2017-12-31 | 178,874,906 |
| Number of terminated vested participants | 2017-12-31 | 183 |
| Fundng target for terminated vested participants | 2017-12-31 | 12,706,712 |
| Active participant vested funding target | 2017-12-31 | 112,417,376 |
| Number of active participants | 2017-12-31 | 656 |
| Total funding liabilities for active participants | 2017-12-31 | 116,127,328 |
| Total participant count | 2017-12-31 | 1,905 |
| Total funding target for all participants | 2017-12-31 | 307,708,946 |
| Balance at beginning of prior year after applicable adjustments | 2017-12-31 | 0 |
| Prefunding balance at beginning of prior year after applicable adjustments | 2017-12-31 | 0 |
| Carryover balanced portion elected for use to offset prior years funding requirement | 2017-12-31 | 0 |
| Prefunding balanced used to offset prior years funding requirement | 2017-12-31 | 0 |
| Amount remaining of carryover balance | 2017-12-31 | 0 |
| Amount remaining of prefunding balance | 2017-12-31 | 0 |
| Present value of excess contributions | 2017-12-31 | 10,317 |
| Total available prior years excess cotributions available at beginning of current plan year to add to prefunding balance | 2017-12-31 | 10,942 |
| Total available prior years excess cotributions added at beginning of current plan year to add to prefunding balance | 2017-12-31 | 0 |
| Reductions in caryover balances due to elections or deemed elections | 2017-12-31 | 0 |
| Reductions in prefunding balances due to elections or deemed elections | 2017-12-31 | 0 |
| Balance of carryovers at beginning of current year | 2017-12-31 | 0 |
| Balance of prefunding at beginning of current year | 2017-12-31 | 0 |
| Total employer contributions | 2017-12-31 | 16,080,000 |
| Total employee contributions | 2017-12-31 | 0 |
| Contributions allocated toward unpaid minimum require contributions from prior years | 2017-12-31 | 0 |
| Contributions made to avoid restrictions adjusted to valuation date | 2017-12-31 | 0 |
| Contributions allocated toward minimum required contributions for current year adjusted to valuation date | 2017-12-31 | 15,411,642 |
| Liquidity shortfalls end of Q1 | 2017-12-31 | 0 |
| Liquidity shortfalls end of Q2 | 2017-12-31 | 0 |
| Liquidity shortfalls end of Q3 | 2017-12-31 | 0 |
| Liquidity shortfalls end of Q4 | 2017-12-31 | 0 |
| Unpaid minimum required contributions for all prior years | 2017-12-31 | 0 |
| iDiscounted employer contributions allocated toward unpaid minimum required contributions from prior years | 2017-12-31 | 0 |
| Remaining amount of unpaid minimum required contributions | 2017-12-31 | 0 |
| Minimum required contributions for current year target normal cost | 2017-12-31 | 8,948,266 |
| Net shortfall amortization installment of oustanding balance | 2017-12-31 | 32,487,666 |
| Waiver amortization installment | 2017-12-31 | 0 |
| Total funding amount beforereflecting carryover/prefunding balances | 2017-12-31 | 15,392,541 |
| Carryover balance elected to use to offset funding requirement | 2017-12-31 | 0 |
| Prefunding balance elected to use to offset funding requirement | 2017-12-31 | 0 |
| Additional cash requirement | 2017-12-31 | 15,392,541 |
| Contributions allocatedtoward minimum required contributions for current year | 2017-12-31 | 15,411,642 |
| Unpaid minimum required contributions for current year | 2017-12-31 | 0 |
| Unpaid minimum required contributions for all years | 2017-12-31 | 0 |
| Total participants, beginning-of-year | 2017-01-01 | 1,877 |
| Total number of active participants reported on line 7a of the Form 5500 | 2017-01-01 | 598 |
| Number of retired or separated participants receiving benefits | 2017-01-01 | 791 |
| Number of other retired or separated participants entitled to future benefits | 2017-01-01 | 180 |
| Total of all active and inactive participants | 2017-01-01 | 1,569 |
| Number of deceased participants whose beneficiaries are receiving or are entitled to receive benefits | 2017-01-01 | 91 |
| Total participants | 2017-01-01 | 1,660 |
| Participants that terminated employment during the plan year with accrued benefits that were less than 100% vested | 2017-01-01 | 0 |
| 2016: RETIREMENT PLAN FOR BARGAINING UNIT AND NON-BARGAINING UNIT EMPLOYEES OF NORTHWEST NATURAL GAS COMPANY EMPLOYEES 2016 401k membership |
|---|
| Market value of plan assets | 2016-12-31 | 254,061,292 |
| Acturial value of plan assets | 2016-12-31 | 270,667,049 |
| Funding target for retired participants and beneficiaries receiving payment | 2016-12-31 | 170,663,816 |
| Number of terminated vested participants | 2016-12-31 | 183 |
| Fundng target for terminated vested participants | 2016-12-31 | 11,657,299 |
| Active participant vested funding target | 2016-12-31 | 106,177,203 |
| Number of active participants | 2016-12-31 | 693 |
| Total funding liabilities for active participants | 2016-12-31 | 109,628,420 |
| Total participant count | 2016-12-31 | 1,930 |
| Total funding target for all participants | 2016-12-31 | 291,949,535 |
| Balance at beginning of prior year after applicable adjustments | 2016-12-31 | 0 |
| Prefunding balance at beginning of prior year after applicable adjustments | 2016-12-31 | 0 |
| Carryover balanced portion elected for use to offset prior years funding requirement | 2016-12-31 | 0 |
| Prefunding balanced used to offset prior years funding requirement | 2016-12-31 | 0 |
| Amount remaining of carryover balance | 2016-12-31 | 0 |
| Amount remaining of prefunding balance | 2016-12-31 | 0 |
| Present value of excess contributions | 2016-12-31 | 7,409 |
| Total available prior years excess cotributions available at beginning of current plan year to add to prefunding balance | 2016-12-31 | 7,874 |
| Total available prior years excess cotributions added at beginning of current plan year to add to prefunding balance | 2016-12-31 | 0 |
| Reductions in caryover balances due to elections or deemed elections | 2016-12-31 | 0 |
| Reductions in prefunding balances due to elections or deemed elections | 2016-12-31 | 0 |
| Balance of carryovers at beginning of current year | 2016-12-31 | 0 |
| Balance of prefunding at beginning of current year | 2016-12-31 | 0 |
| Total employer contributions | 2016-12-31 | 17,000,000 |
| Total employee contributions | 2016-12-31 | 0 |
| Contributions allocated toward unpaid minimum require contributions from prior years | 2016-12-31 | 0 |
| Contributions made to avoid restrictions adjusted to valuation date | 2016-12-31 | 0 |
| Contributions allocated toward minimum required contributions for current year adjusted to valuation date | 2016-12-31 | 16,118,599 |
| Liquidity shortfalls end of Q1 | 2016-12-31 | 0 |
| Liquidity shortfalls end of Q2 | 2016-12-31 | 0 |
| Liquidity shortfalls end of Q3 | 2016-12-31 | 0 |
| Liquidity shortfalls end of Q4 | 2016-12-31 | 0 |
| Unpaid minimum required contributions for all prior years | 2016-12-31 | 0 |
| iDiscounted employer contributions allocated toward unpaid minimum required contributions from prior years | 2016-12-31 | 0 |
| Remaining amount of unpaid minimum required contributions | 2016-12-31 | 0 |
| Minimum required contributions for current year target normal cost | 2016-12-31 | 7,955,174 |
| Net shortfall amortization installment of oustanding balance | 2016-12-31 | 21,282,486 |
| Waiver amortization installment | 2016-12-31 | 0 |
| Total funding amount beforereflecting carryover/prefunding balances | 2016-12-31 | 16,108,282 |
| Carryover balance elected to use to offset funding requirement | 2016-12-31 | 0 |
| Prefunding balance elected to use to offset funding requirement | 2016-12-31 | 0 |
| Additional cash requirement | 2016-12-31 | 16,108,282 |
| Contributions allocatedtoward minimum required contributions for current year | 2016-12-31 | 16,118,599 |
| Unpaid minimum required contributions for current year | 2016-12-31 | 0 |
| Unpaid minimum required contributions for all years | 2016-12-31 | 0 |
| Total participants, beginning-of-year | 2016-01-01 | 1,903 |
| Total number of active participants reported on line 7a of the Form 5500 | 2016-01-01 | 656 |
| Number of retired or separated participants receiving benefits | 2016-01-01 | 916 |
| Number of other retired or separated participants entitled to future benefits | 2016-01-01 | 176 |
| Total of all active and inactive participants | 2016-01-01 | 1,748 |
| Number of deceased participants whose beneficiaries are receiving or are entitled to receive benefits | 2016-01-01 | 129 |
| Total participants | 2016-01-01 | 1,877 |
| 2015: RETIREMENT PLAN FOR BARGAINING UNIT AND NON-BARGAINING UNIT EMPLOYEES OF NORTHWEST NATURAL GAS COMPANY EMPLOYEES 2015 401k membership |
|---|
| Total participants, beginning-of-year | 2015-01-01 | 2,127 |
| Total number of active participants reported on line 7a of the Form 5500 | 2015-01-01 | 693 |
| Number of retired or separated participants receiving benefits | 2015-01-01 | 900 |
| Number of other retired or separated participants entitled to future benefits | 2015-01-01 | 173 |
| Total of all active and inactive participants | 2015-01-01 | 1,766 |
| Number of deceased participants whose beneficiaries are receiving or are entitled to receive benefits | 2015-01-01 | 137 |
| Total participants | 2015-01-01 | 1,903 |
| Participants that terminated employment during the plan year with accrued benefits that were less than 100% vested | 2015-01-01 | 1 |
| 2014: RETIREMENT PLAN FOR BARGAINING UNIT AND NON-BARGAINING UNIT EMPLOYEES OF NORTHWEST NATURAL GAS COMPANY EMPLOYEES 2014 401k membership |
|---|
| Total participants, beginning-of-year | 2014-01-01 | 2,151 |
| Total number of active participants reported on line 7a of the Form 5500 | 2014-01-01 | 747 |
| Number of retired or separated participants receiving benefits | 2014-01-01 | 875 |
| Number of other retired or separated participants entitled to future benefits | 2014-01-01 | 370 |
| Total of all active and inactive participants | 2014-01-01 | 1,992 |
| Number of deceased participants whose beneficiaries are receiving or are entitled to receive benefits | 2014-01-01 | 133 |
| Total participants | 2014-01-01 | 2,125 |
| Participants that terminated employment during the plan year with accrued benefits that were less than 100% vested | 2014-01-01 | 0 |
| 2013: RETIREMENT PLAN FOR BARGAINING UNIT AND NON-BARGAINING UNIT EMPLOYEES OF NORTHWEST NATURAL GAS COMPANY EMPLOYEES 2013 401k membership |
|---|
| Total participants, beginning-of-year | 2013-01-01 | 2,168 |
| Total number of active participants reported on line 7a of the Form 5500 | 2013-01-01 | 806 |
| Number of retired or separated participants receiving benefits | 2013-01-01 | 833 |
| Number of other retired or separated participants entitled to future benefits | 2013-01-01 | 381 |
| Total of all active and inactive participants | 2013-01-01 | 2,020 |
| Number of deceased participants whose beneficiaries are receiving or are entitled to receive benefits | 2013-01-01 | 131 |
| Total participants | 2013-01-01 | 2,151 |
| Participants that terminated employment during the plan year with accrued benefits that were less than 100% vested | 2013-01-01 | 0 |
| 2012: RETIREMENT PLAN FOR BARGAINING UNIT AND NON-BARGAINING UNIT EMPLOYEES OF NORTHWEST NATURAL GAS COMPANY EMPLOYEES 2012 401k membership |
|---|
| Total participants, beginning-of-year | 2012-01-01 | 848 |
| Total number of active participants reported on line 7a of the Form 5500 | 2012-01-01 | 843 |
| Number of retired or separated participants receiving benefits | 2012-01-01 | 821 |
| Number of other retired or separated participants entitled to future benefits | 2012-01-01 | 384 |
| Total of all active and inactive participants | 2012-01-01 | 2,048 |
| Number of deceased participants whose beneficiaries are receiving or are entitled to receive benefits | 2012-01-01 | 120 |
| Total participants | 2012-01-01 | 2,168 |
| Participants that terminated employment during the plan year with accrued benefits that were less than 100% vested | 2012-01-01 | 2 |
| 2011: RETIREMENT PLAN FOR BARGAINING UNIT AND NON-BARGAINING UNIT EMPLOYEES OF NORTHWEST NATURAL GAS COMPANY EMPLOYEES 2011 401k membership |
|---|
| Total participants, beginning-of-year | 2011-01-01 | 841 |
| Total number of active participants reported on line 7a of the Form 5500 | 2011-01-01 | 342 |
| Number of retired or separated participants receiving benefits | 2011-01-01 | 318 |
| Number of other retired or separated participants entitled to future benefits | 2011-01-01 | 145 |
| Total of all active and inactive participants | 2011-01-01 | 805 |
| Number of deceased participants whose beneficiaries are receiving or are entitled to receive benefits | 2011-01-01 | 43 |
| Total participants | 2011-01-01 | 848 |
| Participants that terminated employment during the plan year with accrued benefits that were less than 100% vested | 2011-01-01 | 0 |
| 2009: RETIREMENT PLAN FOR BARGAINING UNIT AND NON-BARGAINING UNIT EMPLOYEES OF NORTHWEST NATURAL GAS COMPANY EMPLOYEES 2009 401k membership |
|---|
| Total participants, beginning-of-year | 2009-01-01 | 843 |
| Total number of active participants reported on line 7a of the Form 5500 | 2009-01-01 | 345 |
| Number of retired or separated participants receiving benefits | 2009-01-01 | 295 |
| Number of other retired or separated participants entitled to future benefits | 2009-01-01 | 154 |
| Total of all active and inactive participants | 2009-01-01 | 794 |
| Number of deceased participants whose beneficiaries are receiving or are entitled to receive benefits | 2009-01-01 | 47 |
| Total participants | 2009-01-01 | 841 |
| Participants that terminated employment during the plan year with accrued benefits that were less than 100% vested | 2009-01-01 | 0 |
| Measure | Date | Value |
|---|
| 2023 : RETIREMENT PLAN FOR BARGAINING UNIT AND NON-BARGAINING UNIT EMPLOYEES OF NORTHWEST NATURAL GAS COMPANY EMPLOYEES 2023 401k financial data |
|---|
| Total unrealized appreciation/depreciation of assets | 2023-12-31 | $0 |
| Total liabilities at end of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2023-12-31 | $0 |
| Total liabilities at beginning of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2023-12-31 | $0 |
| Total income from all sources (including contributions) | 2023-12-31 | $42,484,084 |
| Total loss/gain on sale of assets | 2023-12-31 | $0 |
| Total of all expenses incurred | 2023-12-31 | $28,274,026 |
| Benefit payments and payments to participlants,beneficiaries,insurance carriers and others | 2023-12-31 | $25,700,724 |
| Total contributions o plan (from employers,participants, others, non cash contrinutions) | 2023-12-31 | $11,070,000 |
| Value of total assets at end of year | 2023-12-31 | $294,515,885 |
| Value of total assets at beginning of year | 2023-12-31 | $280,305,827 |
| Total of administrative expenses incurred including professional, contract, advisory and management fees | 2023-12-31 | $2,573,302 |
| Total interest from all sources | 2023-12-31 | $25,160 |
| Total dividends received (eg from common stock, registered investment company shares) | 2023-12-31 | $752,156 |
| Has a resolution to terminate the plan been adopted during the plan year or any prior plan year | 2023-12-31 | No |
| Total dividends received from registered investment company shares (eg mutual funds) | 2023-12-31 | $752,156 |
| Was this plan covered by a fidelity bond | 2023-12-31 | Yes |
| Value of fidelity bond cover | 2023-12-31 | $15,000,000 |
| If this is an individual account plan, was there a blackout period | 2023-12-31 | No |
| Were there any nonexempt tranactions with any party-in-interest | 2023-12-31 | No |
| Value of other receiveables (less allowance for doubtful accounts) at end of year | 2023-12-31 | $2,543 |
| Value of other receiveables (less allowance for doubtful accounts) at beginning of year | 2023-12-31 | $1,692 |
| Other income not declared elsewhere | 2023-12-31 | $22,733,201 |
| Administrative expenses (other) incurred | 2023-12-31 | $1,228,640 |
| Did the receive any noncash contributions whose value was neither redily determinable on an established market nor set by an independent third party appraiser | 2023-12-31 | No |
| Value of net income/loss | 2023-12-31 | $14,210,058 |
| Value of net assets at end of year (total assets less liabilities) | 2023-12-31 | $294,515,885 |
| Value of net assets at beginning of year (total assets less liabilities) | 2023-12-31 | $280,305,827 |
| Did the plan have a loss casued by fraud or dishonesty (regardless whether reimbursed by fidelity bond) | 2023-12-31 | No |
| Were any loans by the plan or fixed income obligations due to the plan in default | 2023-12-31 | No |
| Were any leases to which the plan was party in default or uncollectible | 2023-12-31 | No |
| Investment advisory and management fees | 2023-12-31 | $1,344,589 |
| Value of interest in registered invesment companies (eg mutual funds) at end of year | 2023-12-31 | $27,730,393 |
| Value of interest in registered invesment companies (eg mutual funds) at beginning of year | 2023-12-31 | $26,676,685 |
| Value of interest in common/collective trusts at end of year | 2023-12-31 | $253,232,754 |
| Value of interest in common/collective trusts at beginning of year | 2023-12-31 | $251,282,091 |
| Value of interest bearing cash (including money market accounts and certificates of deposits) at end of year | 2023-12-31 | $2,480,195 |
| Interest-bearing cash (include money market accounts & certificates of deposit) at beginning of the Year | 2023-12-31 | $2,345,359 |
| Value of interest bearing cash (including money market accounts and certificates of deposits) at beginning of year | 2023-12-31 | $2,345,359 |
| Interest earned from interest bearing cash (including money market accounts and certificates of deposit) | 2023-12-31 | $25,160 |
| Net investment gain or loss from common/collective trusts | 2023-12-31 | $7,903,567 |
| Were any plan transactions or series of transactions in excess of 5% of the current value of the plan assets | 2023-12-31 | Yes |
| Was there a failure to transmit to the plan any participant contributions | 2023-12-31 | No |
| Has the plan failed to provide any benefit when due under the plan | 2023-12-31 | No |
| Contributions received in cash from employer | 2023-12-31 | $11,070,000 |
| Employer contributions (assets) at end of year | 2023-12-31 | $11,070,000 |
| Employer contributions (assets) at beginning of year | 2023-12-31 | $0 |
| Benefit payments and payments to provide benefits directly to participlants or beneficiaries including direct rollovers | 2023-12-31 | $25,700,724 |
| Did the plan have assets held for investment | 2023-12-31 | Yes |
| Did the plan hold any assets whose current value was neither redily determinable on an established market nor set by an independent third party appraiser | 2023-12-31 | No |
| Were all the plan assets eitehr distributed to particpants/beneficiaries, transferred to another plan or brought under the control of the PBGC | 2023-12-31 | No |
| Opinion of an independent qualified public accountant for this plan | 2023-12-31 | Unqualified |
| Accountancy firm name | 2023-12-31 | GRANT THORNTON LLP |
| Accountancy firm EIN | 2023-12-31 | 366055558 |
| Total unrealized appreciation/depreciation of assets | 2023-01-01 | $0 |
| Total liabilities at end of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2023-01-01 | $0 |
| Total liabilities at beginning of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2023-01-01 | $0 |
| Total income from all sources (including contributions) | 2023-01-01 | $42,484,084 |
| Total loss/gain on sale of assets | 2023-01-01 | $0 |
| Total of all expenses incurred | 2023-01-01 | $28,274,026 |
| Benefit payments and payments to participlants,beneficiaries,insurance carriers and others | 2023-01-01 | $25,700,724 |
| Total contributions o plan (from employers,participants, others, non cash contrinutions) | 2023-01-01 | $11,070,000 |
| Value of total assets at end of year | 2023-01-01 | $294,515,885 |
| Value of total assets at beginning of year | 2023-01-01 | $280,305,827 |
| Total of administrative expenses incurred including professional, contract, advisory and management fees | 2023-01-01 | $2,573,302 |
| Total interest from all sources | 2023-01-01 | $25,160 |
| Total dividends received (eg from common stock, registered investment company shares) | 2023-01-01 | $752,156 |
| Has a resolution to terminate the plan been adopted during the plan year or any prior plan year | 2023-01-01 | No |
| Total dividends received from registered investment company shares (eg mutual funds) | 2023-01-01 | $752,156 |
| Was this plan covered by a fidelity bond | 2023-01-01 | Yes |
| Value of fidelity bond cover | 2023-01-01 | $15,000,000 |
| If this is an individual account plan, was there a blackout period | 2023-01-01 | No |
| Were there any nonexempt tranactions with any party-in-interest | 2023-01-01 | No |
| Value of other receiveables (less allowance for doubtful accounts) at end of year | 2023-01-01 | $2,543 |
| Value of other receiveables (less allowance for doubtful accounts) at beginning of year | 2023-01-01 | $1,692 |
| Other income not declared elsewhere | 2023-01-01 | $22,733,201 |
| Administrative expenses (other) incurred | 2023-01-01 | $1,228,640 |
| Did the receive any noncash contributions whose value was neither redily determinable on an established market nor set by an independent third party appraiser | 2023-01-01 | No |
| Value of net income/loss | 2023-01-01 | $14,210,058 |
| Value of net assets at end of year (total assets less liabilities) | 2023-01-01 | $294,515,885 |
| Value of net assets at beginning of year (total assets less liabilities) | 2023-01-01 | $280,305,827 |
| Did the plan have a loss casued by fraud or dishonesty (regardless whether reimbursed by fidelity bond) | 2023-01-01 | No |
| Were any loans by the plan or fixed income obligations due to the plan in default | 2023-01-01 | No |
| Were any leases to which the plan was party in default or uncollectible | 2023-01-01 | No |
| Investment advisory and management fees | 2023-01-01 | $1,344,589 |
| Value of interest in registered invesment companies (eg mutual funds) at end of year | 2023-01-01 | $27,730,393 |
| Value of interest in registered invesment companies (eg mutual funds) at beginning of year | 2023-01-01 | $26,676,685 |
| Value of interest in common/collective trusts at end of year | 2023-01-01 | $253,232,754 |
| Value of interest in common/collective trusts at beginning of year | 2023-01-01 | $251,282,091 |
| Value of interest bearing cash (including money market accounts and certificates of deposits) at end of year | 2023-01-01 | $2,480,195 |
| Interest earned from interest bearing cash (including money market accounts and certificates of deposit) | 2023-01-01 | $25,160 |
| Net investment gain or loss from common/collective trusts | 2023-01-01 | $7,903,567 |
| Were any plan transactions or series of transactions in excess of 5% of the current value of the plan assets | 2023-01-01 | Yes |
| Was there a failure to transmit to the plan any participant contributions | 2023-01-01 | No |
| Has the plan failed to provide any benefit when due under the plan | 2023-01-01 | No |
| Contributions received in cash from employer | 2023-01-01 | $11,070,000 |
| Employer contributions (assets) at end of year | 2023-01-01 | $11,070,000 |
| Employer contributions (assets) at beginning of year | 2023-01-01 | $0 |
| Benefit payments and payments to provide benefits directly to participlants or beneficiaries including direct rollovers | 2023-01-01 | $25,700,724 |
| Did the plan have assets held for investment | 2023-01-01 | Yes |
| Did the plan hold any assets whose current value was neither redily determinable on an established market nor set by an independent third party appraiser | 2023-01-01 | No |
| Were all the plan assets eitehr distributed to particpants/beneficiaries, transferred to another plan or brought under the control of the PBGC | 2023-01-01 | No |
| Opinion of an independent qualified public accountant for this plan | 2023-01-01 | 1 |
| Accountancy firm name | 2023-01-01 | GRANT THORNTON LLP |
| Accountancy firm EIN | 2023-01-01 | 366055558 |
| 2022 : RETIREMENT PLAN FOR BARGAINING UNIT AND NON-BARGAINING UNIT EMPLOYEES OF NORTHWEST NATURAL GAS COMPANY EMPLOYEES 2022 401k financial data |
|---|
| Total unrealized appreciation/depreciation of assets | 2022-12-31 | $0 |
| Total liabilities at end of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2022-12-31 | $0 |
| Total liabilities at beginning of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2022-12-31 | $0 |
| Total income from all sources (including contributions) | 2022-12-31 | $-90,756,995 |
| Total loss/gain on sale of assets | 2022-12-31 | $0 |
| Total of all expenses incurred | 2022-12-31 | $28,153,613 |
| Benefit payments and payments to participlants,beneficiaries,insurance carriers and others | 2022-12-31 | $25,210,485 |
| Total contributions o plan (from employers,participants, others, non cash contrinutions) | 2022-12-31 | $0 |
| Value of total assets at end of year | 2022-12-31 | $280,305,827 |
| Value of total assets at beginning of year | 2022-12-31 | $399,216,435 |
| Total of administrative expenses incurred including professional, contract, advisory and management fees | 2022-12-31 | $2,943,128 |
| Total interest from all sources | 2022-12-31 | $6,876 |
| Total dividends received (eg from common stock, registered investment company shares) | 2022-12-31 | $671,695 |
| Has a resolution to terminate the plan been adopted during the plan year or any prior plan year | 2022-12-31 | No |
| Total dividends received from registered investment company shares (eg mutual funds) | 2022-12-31 | $671,695 |
| Was this plan covered by a fidelity bond | 2022-12-31 | Yes |
| Value of fidelity bond cover | 2022-12-31 | $15,000,000 |
| If this is an individual account plan, was there a blackout period | 2022-12-31 | No |
| Were there any nonexempt tranactions with any party-in-interest | 2022-12-31 | No |
| Value of other receiveables (less allowance for doubtful accounts) at end of year | 2022-12-31 | $1,692 |
| Value of other receiveables (less allowance for doubtful accounts) at beginning of year | 2022-12-31 | $7 |
| Administrative expenses (other) incurred | 2022-12-31 | $1,165,826 |
| Did the receive any noncash contributions whose value was neither redily determinable on an established market nor set by an independent third party appraiser | 2022-12-31 | No |
| Value of net income/loss | 2022-12-31 | $-118,910,608 |
| Value of net assets at end of year (total assets less liabilities) | 2022-12-31 | $280,305,827 |
| Value of net assets at beginning of year (total assets less liabilities) | 2022-12-31 | $399,216,435 |
| Did the plan have a loss casued by fraud or dishonesty (regardless whether reimbursed by fidelity bond) | 2022-12-31 | No |
| Were any loans by the plan or fixed income obligations due to the plan in default | 2022-12-31 | No |
| Were any leases to which the plan was party in default or uncollectible | 2022-12-31 | No |
| Investment advisory and management fees | 2022-12-31 | $1,777,302 |
| Value of interest in registered invesment companies (eg mutual funds) at end of year | 2022-12-31 | $26,676,685 |
| Value of interest in registered invesment companies (eg mutual funds) at beginning of year | 2022-12-31 | $35,455,895 |
| Value of interest in common/collective trusts at end of year | 2022-12-31 | $251,282,091 |
| Value of interest in common/collective trusts at beginning of year | 2022-12-31 | $361,479,967 |
| Value of interest bearing cash (including money market accounts and certificates of deposits) at end of year | 2022-12-31 | $2,345,359 |
| Interest-bearing cash (include money market accounts & certificates of deposit) at beginning of the Year | 2022-12-31 | $2,280,566 |
| Value of interest bearing cash (including money market accounts and certificates of deposits) at beginning of year | 2022-12-31 | $2,280,566 |
| Interest earned from interest bearing cash (including money market accounts and certificates of deposit) | 2022-12-31 | $6,876 |
| Net investment gain or loss from common/collective trusts | 2022-12-31 | $-91,435,566 |
| Were any plan transactions or series of transactions in excess of 5% of the current value of the plan assets | 2022-12-31 | Yes |
| Was there a failure to transmit to the plan any participant contributions | 2022-12-31 | No |
| Has the plan failed to provide any benefit when due under the plan | 2022-12-31 | No |
| Employer contributions (assets) at end of year | 2022-12-31 | $0 |
| Employer contributions (assets) at beginning of year | 2022-12-31 | $0 |
| Benefit payments and payments to provide benefits directly to participlants or beneficiaries including direct rollovers | 2022-12-31 | $25,210,485 |
| Did the plan have assets held for investment | 2022-12-31 | Yes |
| Did the plan hold any assets whose current value was neither redily determinable on an established market nor set by an independent third party appraiser | 2022-12-31 | No |
| Were all the plan assets eitehr distributed to particpants/beneficiaries, transferred to another plan or brought under the control of the PBGC | 2022-12-31 | No |
| Opinion of an independent qualified public accountant for this plan | 2022-12-31 | Unqualified |
| Accountancy firm name | 2022-12-31 | GRANT THORNTON LLP |
| Accountancy firm EIN | 2022-12-31 | 366055558 |
| Total unrealized appreciation/depreciation of assets | 2022-01-01 | $0 |
| Total liabilities at end of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2022-01-01 | $0 |
| Total liabilities at beginning of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2022-01-01 | $0 |
| Total income from all sources (including contributions) | 2022-01-01 | $-90,756,995 |
| Total loss/gain on sale of assets | 2022-01-01 | $0 |
| Total of all expenses incurred | 2022-01-01 | $28,153,613 |
| Benefit payments and payments to participlants,beneficiaries,insurance carriers and others | 2022-01-01 | $25,210,485 |
| Total contributions o plan (from employers,participants, others, non cash contrinutions) | 2022-01-01 | $0 |
| Value of total assets at end of year | 2022-01-01 | $280,305,827 |
| Value of total assets at beginning of year | 2022-01-01 | $399,216,435 |
| Total of administrative expenses incurred including professional, contract, advisory and management fees | 2022-01-01 | $2,943,128 |
| Total interest from all sources | 2022-01-01 | $6,876 |
| Total dividends received (eg from common stock, registered investment company shares) | 2022-01-01 | $671,695 |
| Has a resolution to terminate the plan been adopted during the plan year or any prior plan year | 2022-01-01 | No |
| Total dividends received from registered investment company shares (eg mutual funds) | 2022-01-01 | $671,695 |
| Was this plan covered by a fidelity bond | 2022-01-01 | Yes |
| Value of fidelity bond cover | 2022-01-01 | $15,000,000 |
| If this is an individual account plan, was there a blackout period | 2022-01-01 | No |
| Were there any nonexempt tranactions with any party-in-interest | 2022-01-01 | No |
| Value of other receiveables (less allowance for doubtful accounts) at end of year | 2022-01-01 | $1,692 |
| Value of other receiveables (less allowance for doubtful accounts) at beginning of year | 2022-01-01 | $7 |
| Administrative expenses (other) incurred | 2022-01-01 | $1,165,826 |
| Did the receive any noncash contributions whose value was neither redily determinable on an established market nor set by an independent third party appraiser | 2022-01-01 | No |
| Value of net income/loss | 2022-01-01 | $-118,910,608 |
| Value of net assets at end of year (total assets less liabilities) | 2022-01-01 | $280,305,827 |
| Value of net assets at beginning of year (total assets less liabilities) | 2022-01-01 | $399,216,435 |
| Did the plan have a loss casued by fraud or dishonesty (regardless whether reimbursed by fidelity bond) | 2022-01-01 | No |
| Were any loans by the plan or fixed income obligations due to the plan in default | 2022-01-01 | No |
| Were any leases to which the plan was party in default or uncollectible | 2022-01-01 | No |
| Investment advisory and management fees | 2022-01-01 | $1,777,302 |
| Value of interest in registered invesment companies (eg mutual funds) at end of year | 2022-01-01 | $26,676,685 |
| Value of interest in registered invesment companies (eg mutual funds) at beginning of year | 2022-01-01 | $35,455,895 |
| Value of interest in common/collective trusts at end of year | 2022-01-01 | $251,282,091 |
| Value of interest in common/collective trusts at beginning of year | 2022-01-01 | $361,479,967 |
| Value of interest bearing cash (including money market accounts and certificates of deposits) at end of year | 2022-01-01 | $2,345,359 |
| Interest earned from interest bearing cash (including money market accounts and certificates of deposit) | 2022-01-01 | $6,876 |
| Net investment gain or loss from common/collective trusts | 2022-01-01 | $-91,435,566 |
| Were any plan transactions or series of transactions in excess of 5% of the current value of the plan assets | 2022-01-01 | Yes |
| Was there a failure to transmit to the plan any participant contributions | 2022-01-01 | No |
| Has the plan failed to provide any benefit when due under the plan | 2022-01-01 | No |
| Employer contributions (assets) at end of year | 2022-01-01 | $0 |
| Employer contributions (assets) at beginning of year | 2022-01-01 | $0 |
| Benefit payments and payments to provide benefits directly to participlants or beneficiaries including direct rollovers | 2022-01-01 | $25,210,485 |
| Did the plan have assets held for investment | 2022-01-01 | Yes |
| Did the plan hold any assets whose current value was neither redily determinable on an established market nor set by an independent third party appraiser | 2022-01-01 | No |
| Were all the plan assets eitehr distributed to particpants/beneficiaries, transferred to another plan or brought under the control of the PBGC | 2022-01-01 | No |
| Opinion of an independent qualified public accountant for this plan | 2022-01-01 | 1 |
| Accountancy firm name | 2022-01-01 | GRANT THORNTON LLP |
| Accountancy firm EIN | 2022-01-01 | 366055558 |
| 2021 : RETIREMENT PLAN FOR BARGAINING UNIT AND NON-BARGAINING UNIT EMPLOYEES OF NORTHWEST NATURAL GAS COMPANY EMPLOYEES 2021 401k financial data |
|---|
| Total unrealized appreciation/depreciation of assets | 2021-12-31 | $0 |
| Total liabilities at end of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2021-12-31 | $0 |
| Total liabilities at beginning of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2021-12-31 | $0 |
| Total income from all sources (including contributions) | 2021-12-31 | $46,839,482 |
| Total loss/gain on sale of assets | 2021-12-31 | $0 |
| Total of all expenses incurred | 2021-12-31 | $26,093,922 |
| Benefit payments and payments to participlants,beneficiaries,insurance carriers and others | 2021-12-31 | $23,016,795 |
| Total contributions o plan (from employers,participants, others, non cash contrinutions) | 2021-12-31 | $5,050,000 |
| Value of total assets at end of year | 2021-12-31 | $399,216,435 |
| Value of total assets at beginning of year | 2021-12-31 | $378,470,875 |
| Total of administrative expenses incurred including professional, contract, advisory and management fees | 2021-12-31 | $3,077,127 |
| Total interest from all sources | 2021-12-31 | $57 |
| Total dividends received (eg from common stock, registered investment company shares) | 2021-12-31 | $1,087,827 |
| Has a resolution to terminate the plan been adopted during the plan year or any prior plan year | 2021-12-31 | No |
| Total dividends received from registered investment company shares (eg mutual funds) | 2021-12-31 | $1,087,827 |
| Was this plan covered by a fidelity bond | 2021-12-31 | Yes |
| Value of fidelity bond cover | 2021-12-31 | $15,000,000 |
| If this is an individual account plan, was there a blackout period | 2021-12-31 | No |
| Total value of distributions paid in property other than in cash, annuity contracts, or publicly traded employer securities | 2021-12-31 | $0 |
| Were there any nonexempt tranactions with any party-in-interest | 2021-12-31 | No |
| Value of other receiveables (less allowance for doubtful accounts) at end of year | 2021-12-31 | $7 |
| Value of other receiveables (less allowance for doubtful accounts) at beginning of year | 2021-12-31 | $4 |
| Administrative expenses (other) incurred | 2021-12-31 | $1,141,514 |
| Did the receive any noncash contributions whose value was neither redily determinable on an established market nor set by an independent third party appraiser | 2021-12-31 | No |
| Value of net income/loss | 2021-12-31 | $20,745,560 |
| Value of net assets at end of year (total assets less liabilities) | 2021-12-31 | $399,216,435 |
| Value of net assets at beginning of year (total assets less liabilities) | 2021-12-31 | $378,470,875 |
| Did the plan have a loss casued by fraud or dishonesty (regardless whether reimbursed by fidelity bond) | 2021-12-31 | No |
| Were any loans by the plan or fixed income obligations due to the plan in default | 2021-12-31 | No |
| Were any leases to which the plan was party in default or uncollectible | 2021-12-31 | No |
| Investment advisory and management fees | 2021-12-31 | $1,935,613 |
| Value of interest in registered invesment companies (eg mutual funds) at end of year | 2021-12-31 | $35,455,895 |
| Value of interest in registered invesment companies (eg mutual funds) at beginning of year | 2021-12-31 | $39,114,128 |
| Value of interest in common/collective trusts at end of year | 2021-12-31 | $361,479,967 |
| Value of interest in common/collective trusts at beginning of year | 2021-12-31 | $332,684,625 |
| Value of interest bearing cash (including money market accounts and certificates of deposits) at end of year | 2021-12-31 | $2,280,566 |
| Interest-bearing cash (include money market accounts & certificates of deposit) at beginning of the Year | 2021-12-31 | $2,132,118 |
| Value of interest bearing cash (including money market accounts and certificates of deposits) at beginning of year | 2021-12-31 | $2,132,118 |
| Interest earned from interest bearing cash (including money market accounts and certificates of deposit) | 2021-12-31 | $57 |
| Net investment gain or loss from common/collective trusts | 2021-12-31 | $40,701,598 |
| Were any plan transactions or series of transactions in excess of 5% of the current value of the plan assets | 2021-12-31 | No |
| Was there a failure to transmit to the plan any participant contributions | 2021-12-31 | No |
| Has the plan failed to provide any benefit when due under the plan | 2021-12-31 | No |
| Contributions received in cash from employer | 2021-12-31 | $5,050,000 |
| Employer contributions (assets) at end of year | 2021-12-31 | $0 |
| Employer contributions (assets) at beginning of year | 2021-12-31 | $4,540,000 |
| Benefit payments and payments to provide benefits directly to participlants or beneficiaries including direct rollovers | 2021-12-31 | $23,016,795 |
| Did the plan have assets held for investment | 2021-12-31 | Yes |
| Did the plan hold any assets whose current value was neither redily determinable on an established market nor set by an independent third party appraiser | 2021-12-31 | No |
| Were all the plan assets eitehr distributed to particpants/beneficiaries, transferred to another plan or brought under the control of the PBGC | 2021-12-31 | No |
| Opinion of an independent qualified public accountant for this plan | 2021-12-31 | Unqualified |
| Accountancy firm name | 2021-12-31 | GRANT THORNTON LLP |
| Accountancy firm EIN | 2021-12-31 | 366055558 |
| 2020 : RETIREMENT PLAN FOR BARGAINING UNIT AND NON-BARGAINING UNIT EMPLOYEES OF NORTHWEST NATURAL GAS COMPANY EMPLOYEES 2020 401k financial data |
|---|
| Total unrealized appreciation/depreciation of assets | 2020-12-31 | $0 |
| Total liabilities at end of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2020-12-31 | $0 |
| Total liabilities at beginning of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2020-12-31 | $0 |
| Total income from all sources (including contributions) | 2020-12-31 | $77,869,101 |
| Total loss/gain on sale of assets | 2020-12-31 | $0 |
| Total of all expenses incurred | 2020-12-31 | $25,506,655 |
| Benefit payments and payments to participlants,beneficiaries,insurance carriers and others | 2020-12-31 | $22,699,257 |
| Total contributions o plan (from employers,participants, others, non cash contrinutions) | 2020-12-31 | $20,470,000 |
| Value of total assets at end of year | 2020-12-31 | $378,470,875 |
| Value of total assets at beginning of year | 2020-12-31 | $326,108,429 |
| Total of administrative expenses incurred including professional, contract, advisory and management fees | 2020-12-31 | $2,807,398 |
| Total interest from all sources | 2020-12-31 | $1,536 |
| Total dividends received (eg from common stock, registered investment company shares) | 2020-12-31 | $723,963 |
| Has a resolution to terminate the plan been adopted during the plan year or any prior plan year | 2020-12-31 | No |
| Total dividends received from registered investment company shares (eg mutual funds) | 2020-12-31 | $723,963 |
| Administrative expenses professional fees incurred | 2020-12-31 | $375,102 |
| Was this plan covered by a fidelity bond | 2020-12-31 | Yes |
| Value of fidelity bond cover | 2020-12-31 | $15,000,000 |
| If this is an individual account plan, was there a blackout period | 2020-12-31 | No |
| Total value of distributions paid in property other than in cash, annuity contracts, or publicly traded employer securities | 2020-12-31 | $0 |
| Were there any nonexempt tranactions with any party-in-interest | 2020-12-31 | No |
| Value of other receiveables (less allowance for doubtful accounts) at end of year | 2020-12-31 | $4 |
| Value of other receiveables (less allowance for doubtful accounts) at beginning of year | 2020-12-31 | $552 |
| Administrative expenses (other) incurred | 2020-12-31 | $1,059,589 |
| Did the receive any noncash contributions whose value was neither redily determinable on an established market nor set by an independent third party appraiser | 2020-12-31 | No |
| Value of net income/loss | 2020-12-31 | $52,362,446 |
| Value of net assets at end of year (total assets less liabilities) | 2020-12-31 | $378,470,875 |
| Value of net assets at beginning of year (total assets less liabilities) | 2020-12-31 | $326,108,429 |
| Did the plan have a loss casued by fraud or dishonesty (regardless whether reimbursed by fidelity bond) | 2020-12-31 | No |
| Were any loans by the plan or fixed income obligations due to the plan in default | 2020-12-31 | No |
| Were any leases to which the plan was party in default or uncollectible | 2020-12-31 | No |
| Investment advisory and management fees | 2020-12-31 | $1,372,707 |
| Value of interest in registered invesment companies (eg mutual funds) at end of year | 2020-12-31 | $39,114,128 |
| Value of interest in registered invesment companies (eg mutual funds) at beginning of year | 2020-12-31 | $33,167,702 |
| Value of interest in common/collective trusts at end of year | 2020-12-31 | $332,684,625 |
| Value of interest in common/collective trusts at beginning of year | 2020-12-31 | $277,874,960 |
| Value of interest bearing cash (including money market accounts and certificates of deposits) at end of year | 2020-12-31 | $2,132,118 |
| Interest-bearing cash (include money market accounts & certificates of deposit) at beginning of the Year | 2020-12-31 | $2,015,215 |
| Value of interest bearing cash (including money market accounts and certificates of deposits) at beginning of year | 2020-12-31 | $2,015,215 |
| Interest earned from interest bearing cash (including money market accounts and certificates of deposit) | 2020-12-31 | $1,536 |
| Net investment gain or loss from common/collective trusts | 2020-12-31 | $56,673,602 |
| Were any plan transactions or series of transactions in excess of 5% of the current value of the plan assets | 2020-12-31 | No |
| Was there a failure to transmit to the plan any participant contributions | 2020-12-31 | No |
| Has the plan failed to provide any benefit when due under the plan | 2020-12-31 | No |
| Contributions received in cash from employer | 2020-12-31 | $20,470,000 |
| Employer contributions (assets) at end of year | 2020-12-31 | $4,540,000 |
| Employer contributions (assets) at beginning of year | 2020-12-31 | $13,050,000 |
| Benefit payments and payments to provide benefits directly to participlants or beneficiaries including direct rollovers | 2020-12-31 | $22,699,257 |
| Did the plan have assets held for investment | 2020-12-31 | Yes |
| Did the plan hold any assets whose current value was neither redily determinable on an established market nor set by an independent third party appraiser | 2020-12-31 | No |
| Were all the plan assets eitehr distributed to particpants/beneficiaries, transferred to another plan or brought under the control of the PBGC | 2020-12-31 | No |
| Opinion of an independent qualified public accountant for this plan | 2020-12-31 | Unqualified |
| Accountancy firm name | 2020-12-31 | GRANT THORNTON LLP |
| Accountancy firm EIN | 2020-12-31 | 366055558 |
| 2019 : RETIREMENT PLAN FOR BARGAINING UNIT AND NON-BARGAINING UNIT EMPLOYEES OF NORTHWEST NATURAL GAS COMPANY EMPLOYEES 2019 401k financial data |
|---|
| Unrealized appreciation/depreciation of other (non real estate) assets | 2019-12-31 | $58,403,401 |
| Total unrealized appreciation/depreciation of assets | 2019-12-31 | $58,403,401 |
| Total liabilities at end of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2019-12-31 | $0 |
| Total liabilities at beginning of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2019-12-31 | $0 |
| Total income from all sources (including contributions) | 2019-12-31 | $90,357,707 |
| Total loss/gain on sale of assets | 2019-12-31 | $0 |
| Total of all expenses incurred | 2019-12-31 | $23,535,655 |
| Benefit payments and payments to participlants,beneficiaries,insurance carriers and others | 2019-12-31 | $20,818,072 |
| Total contributions o plan (from employers,participants, others, non cash contrinutions) | 2019-12-31 | $22,530,000 |
| Value of total assets at end of year | 2019-12-31 | $326,108,429 |
| Value of total assets at beginning of year | 2019-12-31 | $259,286,377 |
| Total of administrative expenses incurred including professional, contract, advisory and management fees | 2019-12-31 | $2,717,583 |
| Total interest from all sources | 2019-12-31 | $8,417 |
| Total dividends received (eg from common stock, registered investment company shares) | 2019-12-31 | $1,118,346 |
| Has a resolution to terminate the plan been adopted during the plan year or any prior plan year | 2019-12-31 | No |
| Total dividends received from registered investment company shares (eg mutual funds) | 2019-12-31 | $1,118,346 |
| Administrative expenses professional fees incurred | 2019-12-31 | $461,040 |
| Was this plan covered by a fidelity bond | 2019-12-31 | Yes |
| Value of fidelity bond cover | 2019-12-31 | $15,000,000 |
| If this is an individual account plan, was there a blackout period | 2019-12-31 | No |
| Total value of distributions paid in property other than in cash, annuity contracts, or publicly traded employer securities | 2019-12-31 | $0 |
| Were there any nonexempt tranactions with any party-in-interest | 2019-12-31 | No |
| Assets. Other investments not covered elsewhere at end of year | 2019-12-31 | $0 |
| Assets. Other investments not covered elsewhere at beginning of year | 2019-12-31 | $62,313 |
| Expenses. Other payments made (not to insurance carriers or or participants/beneficiaries) | 2019-12-31 | $6,157 |
| Value of other receiveables (less allowance for doubtful accounts) at end of year | 2019-12-31 | $552 |
| Value of other receiveables (less allowance for doubtful accounts) at beginning of year | 2019-12-31 | $931 |
| Administrative expenses (other) incurred | 2019-12-31 | $1,022,787 |
| Did the receive any noncash contributions whose value was neither redily determinable on an established market nor set by an independent third party appraiser | 2019-12-31 | No |
| Value of net income/loss | 2019-12-31 | $66,822,052 |
| Value of net assets at end of year (total assets less liabilities) | 2019-12-31 | $326,108,429 |
| Value of net assets at beginning of year (total assets less liabilities) | 2019-12-31 | $259,286,377 |
| Did the plan have a loss casued by fraud or dishonesty (regardless whether reimbursed by fidelity bond) | 2019-12-31 | No |
| Were any loans by the plan or fixed income obligations due to the plan in default | 2019-12-31 | No |
| Were any leases to which the plan was party in default or uncollectible | 2019-12-31 | No |
| Investment advisory and management fees | 2019-12-31 | $1,233,756 |
| Value of interest in registered invesment companies (eg mutual funds) at end of year | 2019-12-31 | $33,167,702 |
| Value of interest in registered invesment companies (eg mutual funds) at beginning of year | 2019-12-31 | $24,993,907 |
| Value of interest in common/collective trusts at end of year | 2019-12-31 | $277,874,960 |
| Value of interest in common/collective trusts at beginning of year | 2019-12-31 | $230,916,963 |
| Value of interest bearing cash (including money market accounts and certificates of deposits) at end of year | 2019-12-31 | $2,015,215 |
| Interest-bearing cash (include money market accounts & certificates of deposit) at beginning of the Year | 2019-12-31 | $1,822,263 |
| Value of interest bearing cash (including money market accounts and certificates of deposits) at beginning of year | 2019-12-31 | $1,822,263 |
| Interest earned from interest bearing cash (including money market accounts and certificates of deposit) | 2019-12-31 | $8,417 |
| Net investment gain or loss from common/collective trusts | 2019-12-31 | $8,297,543 |
| Were any plan transactions or series of transactions in excess of 5% of the current value of the plan assets | 2019-12-31 | No |
| Was there a failure to transmit to the plan any participant contributions | 2019-12-31 | No |
| Has the plan failed to provide any benefit when due under the plan | 2019-12-31 | No |
| Contributions received in cash from employer | 2019-12-31 | $22,530,000 |
| Employer contributions (assets) at end of year | 2019-12-31 | $13,050,000 |
| Employer contributions (assets) at beginning of year | 2019-12-31 | $1,490,000 |
| Benefit payments and payments to provide benefits directly to participlants or beneficiaries including direct rollovers | 2019-12-31 | $20,811,915 |
| Did the plan have assets held for investment | 2019-12-31 | Yes |
| Did the plan hold any assets whose current value was neither redily determinable on an established market nor set by an independent third party appraiser | 2019-12-31 | No |
| Were all the plan assets eitehr distributed to particpants/beneficiaries, transferred to another plan or brought under the control of the PBGC | 2019-12-31 | No |
| Accountant perfomed limited scope audit pursuant to 29 CFR 2520.103-8 and/or 103-12(d) | 2019-12-31 | No |
| Opinion of an independent qualified public accountant for this plan | 2019-12-31 | Unqualified |
| Accountancy firm name | 2019-12-31 | GRANT THORNTON LLP |
| Accountancy firm EIN | 2019-12-31 | 366055558 |
| 2018 : RETIREMENT PLAN FOR BARGAINING UNIT AND NON-BARGAINING UNIT EMPLOYEES OF NORTHWEST NATURAL GAS COMPANY EMPLOYEES 2018 401k financial data |
|---|
| Total unrealized appreciation/depreciation of assets | 2018-12-31 | $0 |
| Total liabilities at end of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2018-12-31 | $0 |
| Total liabilities at beginning of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2018-12-31 | $436 |
| Total income from all sources (including contributions) | 2018-12-31 | $-10,242,754 |
| Total loss/gain on sale of assets | 2018-12-31 | $0 |
| Total of all expenses incurred | 2018-12-31 | $22,384,711 |
| Benefit payments and payments to participlants,beneficiaries,insurance carriers and others | 2018-12-31 | $19,743,538 |
| Total contributions o plan (from employers,participants, others, non cash contrinutions) | 2018-12-31 | $13,040,000 |
| Value of total assets at end of year | 2018-12-31 | $259,286,377 |
| Value of total assets at beginning of year | 2018-12-31 | $291,914,278 |
| Total of administrative expenses incurred including professional, contract, advisory and management fees | 2018-12-31 | $2,641,173 |
| Total interest from all sources | 2018-12-31 | $21,623 |
| Total dividends received (eg from common stock, registered investment company shares) | 2018-12-31 | $773,081 |
| Has a resolution to terminate the plan been adopted during the plan year or any prior plan year | 2018-12-31 | No |
| Administrative expenses professional fees incurred | 2018-12-31 | $601,226 |
| Was this plan covered by a fidelity bond | 2018-12-31 | Yes |
| Value of fidelity bond cover | 2018-12-31 | $15,000,000 |
| If this is an individual account plan, was there a blackout period | 2018-12-31 | No |
| Were there any nonexempt tranactions with any party-in-interest | 2018-12-31 | No |
| Assets. Other investments not covered elsewhere at end of year | 2018-12-31 | $62,313 |
| Assets. Other investments not covered elsewhere at beginning of year | 2018-12-31 | $188,611 |
| Value of other receiveables (less allowance for doubtful accounts) at end of year | 2018-12-31 | $931 |
| Value of other receiveables (less allowance for doubtful accounts) at beginning of year | 2018-12-31 | $30,336 |
| Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at end of year | 2018-12-31 | $0 |
| Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at beginning of year | 2018-12-31 | $436 |
| Administrative expenses (other) incurred | 2018-12-31 | $991,020 |
| Did the receive any noncash contributions whose value was neither redily determinable on an established market nor set by an independent third party appraiser | 2018-12-31 | No |
| Value of net income/loss | 2018-12-31 | $-32,627,465 |
| Value of net assets at end of year (total assets less liabilities) | 2018-12-31 | $259,286,377 |
| Value of net assets at beginning of year (total assets less liabilities) | 2018-12-31 | $291,913,842 |
| Did the plan have a loss casued by fraud or dishonesty (regardless whether reimbursed by fidelity bond) | 2018-12-31 | No |
| Were any loans by the plan or fixed income obligations due to the plan in default | 2018-12-31 | No |
| Were any leases to which the plan was party in default or uncollectible | 2018-12-31 | No |
| Investment advisory and management fees | 2018-12-31 | $1,048,927 |
| Value of interest in registered invesment companies (eg mutual funds) at end of year | 2018-12-31 | $24,993,907 |
| Value of interest in registered invesment companies (eg mutual funds) at beginning of year | 2018-12-31 | $21,210,575 |
| Value of interest in common/collective trusts at end of year | 2018-12-31 | $230,916,963 |
| Value of interest in common/collective trusts at beginning of year | 2018-12-31 | $261,215,010 |
| Value of interest bearing cash (including money market accounts and certificates of deposits) at end of year | 2018-12-31 | $1,822,263 |
| Interest-bearing cash (include money market accounts & certificates of deposit) at beginning of the Year | 2018-12-31 | $5,279,746 |
| Value of interest bearing cash (including money market accounts and certificates of deposits) at beginning of year | 2018-12-31 | $5,279,746 |
| Interest earned from interest bearing cash (including money market accounts and certificates of deposit) | 2018-12-31 | $21,623 |
| Net investment gain/loss from registered investment companies (e.g. mutual funds) | 2018-12-31 | $-24,077,458 |
| Were any plan transactions or series of transactions in excess of 5% of the current value of the plan assets | 2018-12-31 | No |
| Was there a failure to transmit to the plan any participant contributions | 2018-12-31 | No |
| Has the plan failed to provide any benefit when due under the plan | 2018-12-31 | No |
| Contributions received in cash from employer | 2018-12-31 | $13,040,000 |
| Employer contributions (assets) at end of year | 2018-12-31 | $1,490,000 |
| Employer contributions (assets) at beginning of year | 2018-12-31 | $3,990,000 |
| Income. Dividends from preferred stock | 2018-12-31 | $773,081 |
| Benefit payments and payments to provide benefits directly to participlants or beneficiaries including direct rollovers | 2018-12-31 | $19,743,538 |
| Did the plan have assets held for investment | 2018-12-31 | Yes |
| Did the plan hold any assets whose current value was neither redily determinable on an established market nor set by an independent third party appraiser | 2018-12-31 | No |
| Were all the plan assets eitehr distributed to particpants/beneficiaries, transferred to another plan or brought under the control of the PBGC | 2018-12-31 | No |
| Accountant perfomed limited scope audit pursuant to 29 CFR 2520.103-8 and/or 103-12(d) | 2018-12-31 | No |
| Opinion of an independent qualified public accountant for this plan | 2018-12-31 | Unqualified |
| Accountancy firm name | 2018-12-31 | GRANT THORNTON LLP |
| Accountancy firm EIN | 2018-12-31 | 366055558 |
| 2017 : RETIREMENT PLAN FOR BARGAINING UNIT AND NON-BARGAINING UNIT EMPLOYEES OF NORTHWEST NATURAL GAS COMPANY EMPLOYEES 2017 401k financial data |
|---|
| Total unrealized appreciation/depreciation of assets | 2017-12-31 | $0 |
| Total liabilities at end of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2017-12-31 | $436 |
| Total liabilities at beginning of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2017-12-31 | $22,173 |
| Total income from all sources (including contributions) | 2017-12-31 | $58,512,889 |
| Total loss/gain on sale of assets | 2017-12-31 | $0 |
| Total of all expenses incurred | 2017-12-31 | $31,652,585 |
| Benefit payments and payments to participlants,beneficiaries,insurance carriers and others | 2017-12-31 | $29,527,432 |
| Total contributions o plan (from employers,participants, others, non cash contrinutions) | 2017-12-31 | $16,080,000 |
| Value of total assets at end of year | 2017-12-31 | $291,914,278 |
| Value of total assets at beginning of year | 2017-12-31 | $265,075,711 |
| Total of administrative expenses incurred including professional, contract, advisory and management fees | 2017-12-31 | $2,125,153 |
| Total interest from all sources | 2017-12-31 | $1,582,123 |
| Total dividends received (eg from common stock, registered investment company shares) | 2017-12-31 | $2,100,644 |
| Has a resolution to terminate the plan been adopted during the plan year or any prior plan year | 2017-12-31 | No |
| Total dividends received from registered investment company shares (eg mutual funds) | 2017-12-31 | $2,100,644 |
| Administrative expenses professional fees incurred | 2017-12-31 | $466,618 |
| Was this plan covered by a fidelity bond | 2017-12-31 | Yes |
| Value of fidelity bond cover | 2017-12-31 | $30,000,000 |
| If this is an individual account plan, was there a blackout period | 2017-12-31 | No |
| Total value of distributions paid in property other than in cash, annuity contracts, or publicly traded employer securities | 2017-12-31 | $0 |
| Were there any nonexempt tranactions with any party-in-interest | 2017-12-31 | No |
| Assets. Other investments not covered elsewhere at end of year | 2017-12-31 | $188,611 |
| Assets. Other investments not covered elsewhere at beginning of year | 2017-12-31 | $3,111,246 |
| Expenses. Other payments made (not to insurance carriers or or participants/beneficiaries) | 2017-12-31 | $9,192,622 |
| Value of other receiveables (less allowance for doubtful accounts) at end of year | 2017-12-31 | $30,336 |
| Value of other receiveables (less allowance for doubtful accounts) at beginning of year | 2017-12-31 | $5,620,671 |
| Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at end of year | 2017-12-31 | $436 |
| Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at beginning of year | 2017-12-31 | $22,173 |
| Administrative expenses (other) incurred | 2017-12-31 | $1,099,922 |
| Did the receive any noncash contributions whose value was neither redily determinable on an established market nor set by an independent third party appraiser | 2017-12-31 | No |
| Value of net income/loss | 2017-12-31 | $26,860,304 |
| Value of net assets at end of year (total assets less liabilities) | 2017-12-31 | $291,913,842 |
| Value of net assets at beginning of year (total assets less liabilities) | 2017-12-31 | $265,053,538 |
| Did the plan have a loss casued by fraud or dishonesty (regardless whether reimbursed by fidelity bond) | 2017-12-31 | No |
| Were any loans by the plan or fixed income obligations due to the plan in default | 2017-12-31 | No |
| Were any leases to which the plan was party in default or uncollectible | 2017-12-31 | No |
| Assets. partnership/joint venture interests at end of year | 2017-12-31 | $0 |
| Assets. partnership/joint venture interests at beginning of year | 2017-12-31 | $14,072,100 |
| Investment advisory and management fees | 2017-12-31 | $558,613 |
| Value of interest in registered invesment companies (eg mutual funds) at end of year | 2017-12-31 | $282,425,585 |
| Value of interest in registered invesment companies (eg mutual funds) at beginning of year | 2017-12-31 | $165,585,331 |
| Value of interest in common/collective trusts at end of year | 2017-12-31 | $0 |
| Value of interest in common/collective trusts at beginning of year | 2017-12-31 | $37,647,125 |
| Value of interest bearing cash (including money market accounts and certificates of deposits) at end of year | 2017-12-31 | $5,279,746 |
| Interest-bearing cash (include money market accounts & certificates of deposit) at beginning of the Year | 2017-12-31 | $2,490,599 |
| Value of interest bearing cash (including money market accounts and certificates of deposits) at beginning of year | 2017-12-31 | $2,490,599 |
| Interest earned from interest bearing cash (including money market accounts and certificates of deposit) | 2017-12-31 | $1,582,123 |
| Net investment gain/loss from registered investment companies (e.g. mutual funds) | 2017-12-31 | $38,750,122 |
| Were any plan transactions or series of transactions in excess of 5% of the current value of the plan assets | 2017-12-31 | Yes |
| Was there a failure to transmit to the plan any participant contributions | 2017-12-31 | No |
| Has the plan failed to provide any benefit when due under the plan | 2017-12-31 | No |
| Contributions received in cash from employer | 2017-12-31 | $16,080,000 |
| Employer contributions (assets) at end of year | 2017-12-31 | $3,990,000 |
| Employer contributions (assets) at beginning of year | 2017-12-31 | $7,340,000 |
| Benefit payments and payments to provide benefits directly to participlants or beneficiaries including direct rollovers | 2017-12-31 | $20,334,810 |
| Assets. Corporate common stocks other than exployer securities at end of year | 2017-12-31 | $0 |
| Assets. Corporate common stocks other than exployer securities at beginning of year | 2017-12-31 | $29,208,639 |
| Did the plan have assets held for investment | 2017-12-31 | Yes |
| Did the plan hold any assets whose current value was neither redily determinable on an established market nor set by an independent third party appraiser | 2017-12-31 | No |
| Were all the plan assets eitehr distributed to particpants/beneficiaries, transferred to another plan or brought under the control of the PBGC | 2017-12-31 | No |
| Accountant perfomed limited scope audit pursuant to 29 CFR 2520.103-8 and/or 103-12(d) | 2017-12-31 | No |
| Opinion of an independent qualified public accountant for this plan | 2017-12-31 | Unqualified |
| Accountancy firm name | 2017-12-31 | GRANT THORNTON LLP |
| Accountancy firm EIN | 2017-12-31 | 366055558 |
| 2016 : RETIREMENT PLAN FOR BARGAINING UNIT AND NON-BARGAINING UNIT EMPLOYEES OF NORTHWEST NATURAL GAS COMPANY EMPLOYEES 2016 401k financial data |
|---|
| Unrealized appreciation/depreciation of other (non real estate) assets | 2016-12-31 | $-8,178,909 |
| Total unrealized appreciation/depreciation of assets | 2016-12-31 | $-8,178,909 |
| Total liabilities at end of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2016-12-31 | $22,173 |
| Total liabilities at beginning of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2016-12-31 | $562,005 |
| Total income from all sources (including contributions) | 2016-12-31 | $31,515,933 |
| Total loss/gain on sale of assets | 2016-12-31 | $0 |
| Total of all expenses incurred | 2016-12-31 | $20,610,807 |
| Benefit payments and payments to participlants,beneficiaries,insurance carriers and others | 2016-12-31 | $18,687,831 |
| Total contributions o plan (from employers,participants, others, non cash contrinutions) | 2016-12-31 | $17,000,000 |
| Value of total assets at end of year | 2016-12-31 | $265,075,711 |
| Value of total assets at beginning of year | 2016-12-31 | $254,710,417 |
| Total of administrative expenses incurred including professional, contract, advisory and management fees | 2016-12-31 | $1,922,976 |
| Total interest from all sources | 2016-12-31 | $1,689,799 |
| Total dividends received (eg from common stock, registered investment company shares) | 2016-12-31 | $2,616,437 |
| Has a resolution to terminate the plan been adopted during the plan year or any prior plan year | 2016-12-31 | No |
| Administrative expenses professional fees incurred | 2016-12-31 | $99,573 |
| Was this plan covered by a fidelity bond | 2016-12-31 | Yes |
| Value of fidelity bond cover | 2016-12-31 | $30,000,000 |
| If this is an individual account plan, was there a blackout period | 2016-12-31 | No |
| Total value of distributions paid in property other than in cash, annuity contracts, or publicly traded employer securities | 2016-12-31 | $0 |
| Were there any nonexempt tranactions with any party-in-interest | 2016-12-31 | No |
| Assets. Other investments not covered elsewhere at end of year | 2016-12-31 | $3,111,246 |
| Assets. Other investments not covered elsewhere at beginning of year | 2016-12-31 | $36,757,744 |
| Value of other receiveables (less allowance for doubtful accounts) at end of year | 2016-12-31 | $5,620,671 |
| Value of other receiveables (less allowance for doubtful accounts) at beginning of year | 2016-12-31 | $574,433 |
| Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at end of year | 2016-12-31 | $22,173 |
| Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at beginning of year | 2016-12-31 | $562,005 |
| Administrative expenses (other) incurred | 2016-12-31 | $1,073,292 |
| Did the receive any noncash contributions whose value was neither redily determinable on an established market nor set by an independent third party appraiser | 2016-12-31 | No |
| Value of net income/loss | 2016-12-31 | $10,905,126 |
| Value of net assets at end of year (total assets less liabilities) | 2016-12-31 | $265,053,538 |
| Value of net assets at beginning of year (total assets less liabilities) | 2016-12-31 | $254,148,412 |
| Did the plan have a loss casued by fraud or dishonesty (regardless whether reimbursed by fidelity bond) | 2016-12-31 | No |
| Were any loans by the plan or fixed income obligations due to the plan in default | 2016-12-31 | No |
| Were any leases to which the plan was party in default or uncollectible | 2016-12-31 | No |
| Assets. partnership/joint venture interests at end of year | 2016-12-31 | $14,072,100 |
| Assets. partnership/joint venture interests at beginning of year | 2016-12-31 | $12,298,490 |
| Investment advisory and management fees | 2016-12-31 | $494,163 |
| Value of interest in registered invesment companies (eg mutual funds) at end of year | 2016-12-31 | $165,585,331 |
| Value of interest in registered invesment companies (eg mutual funds) at beginning of year | 2016-12-31 | $141,849,863 |
| Interest earned on other investments | 2016-12-31 | $1,689,799 |
| Value of interest in common/collective trusts at end of year | 2016-12-31 | $37,647,125 |
| Value of interest in common/collective trusts at beginning of year | 2016-12-31 | $22,822,877 |
| Value of interest bearing cash (including money market accounts and certificates of deposits) at end of year | 2016-12-31 | $2,490,599 |
| Interest-bearing cash (include money market accounts & certificates of deposit) at beginning of the Year | 2016-12-31 | $3,278,234 |
| Value of interest bearing cash (including money market accounts and certificates of deposits) at beginning of year | 2016-12-31 | $3,278,234 |
| Net investment gain/loss from registered investment companies (e.g. mutual funds) | 2016-12-31 | $19,928,952 |
| Net investment gain or loss from common/collective trusts | 2016-12-31 | $-1,540,346 |
| Were any plan transactions or series of transactions in excess of 5% of the current value of the plan assets | 2016-12-31 | Yes |
| Was there a failure to transmit to the plan any participant contributions | 2016-12-31 | No |
| Has the plan failed to provide any benefit when due under the plan | 2016-12-31 | No |
| Contributions received in cash from employer | 2016-12-31 | $17,000,000 |
| Employer contributions (assets) at end of year | 2016-12-31 | $7,340,000 |
| Employer contributions (assets) at beginning of year | 2016-12-31 | $4,810,000 |
| Income. Dividends from preferred stock | 2016-12-31 | $56,600 |
| Income. Dividends from common stock | 2016-12-31 | $2,559,837 |
| Benefit payments and payments to provide benefits directly to participlants or beneficiaries including direct rollovers | 2016-12-31 | $18,687,831 |
| Contract administrator fees | 2016-12-31 | $255,948 |
| Assets. Corporate common stocks other than exployer securities at end of year | 2016-12-31 | $29,208,639 |
| Assets. Corporate common stocks other than exployer securities at beginning of year | 2016-12-31 | $32,318,776 |
| Did the plan have assets held for investment | 2016-12-31 | Yes |
| Did the plan hold any assets whose current value was neither redily determinable on an established market nor set by an independent third party appraiser | 2016-12-31 | No |
| Were all the plan assets eitehr distributed to particpants/beneficiaries, transferred to another plan or brought under the control of the PBGC | 2016-12-31 | No |
| Accountant perfomed limited scope audit pursuant to 29 CFR 2520.103-8 and/or 103-12(d) | 2016-12-31 | No |
| Opinion of an independent qualified public accountant for this plan | 2016-12-31 | Unqualified |
| Accountancy firm name | 2016-12-31 | GRANT THORNTON LLP |
| Accountancy firm EIN | 2016-12-31 | 366055558 |
| 2015 : RETIREMENT PLAN FOR BARGAINING UNIT AND NON-BARGAINING UNIT EMPLOYEES OF NORTHWEST NATURAL GAS COMPANY EMPLOYEES 2015 401k financial data |
|---|
| Unrealized appreciation/depreciation of other (non real estate) assets | 2015-12-31 | $-1,807,187 |
| Total unrealized appreciation/depreciation of assets | 2015-12-31 | $-1,807,187 |
| Total liabilities at end of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2015-12-31 | $562,005 |
| Total liabilities at beginning of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2015-12-31 | $178,808 |
| Total income from all sources (including contributions) | 2015-12-31 | $5,982,225 |
| Total loss/gain on sale of assets | 2015-12-31 | $0 |
| Total of all expenses incurred | 2015-12-31 | $36,418,851 |
| Benefit payments and payments to participlants,beneficiaries,insurance carriers and others | 2015-12-31 | $34,346,136 |
| Total contributions o plan (from employers,participants, others, non cash contrinutions) | 2015-12-31 | $13,510,000 |
| Value of total assets at end of year | 2015-12-31 | $254,710,417 |
| Value of total assets at beginning of year | 2015-12-31 | $284,763,846 |
| Total of administrative expenses incurred including professional, contract, advisory and management fees | 2015-12-31 | $2,072,715 |
| Total interest from all sources | 2015-12-31 | $0 |
| Total dividends received (eg from common stock, registered investment company shares) | 2015-12-31 | $2,914,771 |
| Has a resolution to terminate the plan been adopted during the plan year or any prior plan year | 2015-12-31 | No |
| Total dividends received from registered investment company shares (eg mutual funds) | 2015-12-31 | $1,994,549 |
| Administrative expenses professional fees incurred | 2015-12-31 | $118,532 |
| Was this plan covered by a fidelity bond | 2015-12-31 | Yes |
| Value of fidelity bond cover | 2015-12-31 | $30,000,000 |
| If this is an individual account plan, was there a blackout period | 2015-12-31 | No |
| Total value of distributions paid in property other than in cash, annuity contracts, or publicly traded employer securities | 2015-12-31 | $0 |
| Were there any nonexempt tranactions with any party-in-interest | 2015-12-31 | No |
| Assets. Other investments not covered elsewhere at end of year | 2015-12-31 | $36,757,744 |
| Assets. Other investments not covered elsewhere at beginning of year | 2015-12-31 | $37,066,217 |
| Value of other receiveables (less allowance for doubtful accounts) at end of year | 2015-12-31 | $574,433 |
| Value of other receiveables (less allowance for doubtful accounts) at beginning of year | 2015-12-31 | $2,203,733 |
| Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at end of year | 2015-12-31 | $562,005 |
| Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at beginning of year | 2015-12-31 | $178,808 |
| Administrative expenses (other) incurred | 2015-12-31 | $1,010,325 |
| Did the receive any noncash contributions whose value was neither redily determinable on an established market nor set by an independent third party appraiser | 2015-12-31 | No |
| Value of net income/loss | 2015-12-31 | $-30,436,626 |
| Value of net assets at end of year (total assets less liabilities) | 2015-12-31 | $254,148,412 |
| Value of net assets at beginning of year (total assets less liabilities) | 2015-12-31 | $284,585,038 |
| Did the plan have a loss casued by fraud or dishonesty (regardless whether reimbursed by fidelity bond) | 2015-12-31 | No |
| Were any loans by the plan or fixed income obligations due to the plan in default | 2015-12-31 | No |
| Were any leases to which the plan was party in default or uncollectible | 2015-12-31 | No |
| Assets. partnership/joint venture interests at end of year | 2015-12-31 | $12,298,490 |
| Assets. partnership/joint venture interests at beginning of year | 2015-12-31 | $13,086,914 |
| Investment advisory and management fees | 2015-12-31 | $569,065 |
| Value of interest in registered invesment companies (eg mutual funds) at end of year | 2015-12-31 | $141,849,863 |
| Value of interest in registered invesment companies (eg mutual funds) at beginning of year | 2015-12-31 | $177,775,037 |
| Value of interest in common/collective trusts at end of year | 2015-12-31 | $22,822,877 |
| Value of interest in common/collective trusts at beginning of year | 2015-12-31 | $18,024,954 |
| Value of interest bearing cash (including money market accounts and certificates of deposits) at end of year | 2015-12-31 | $3,278,234 |
| Interest-bearing cash (include money market accounts & certificates of deposit) at beginning of the Year | 2015-12-31 | $1,720,892 |
| Value of interest bearing cash (including money market accounts and certificates of deposits) at beginning of year | 2015-12-31 | $1,720,892 |
| Net investment gain/loss from registered investment companies (e.g. mutual funds) | 2015-12-31 | $-7,361,075 |
| Net investment gain or loss from common/collective trusts | 2015-12-31 | $-1,274,284 |
| Were any plan transactions or series of transactions in excess of 5% of the current value of the plan assets | 2015-12-31 | Yes |
| Was there a failure to transmit to the plan any participant contributions | 2015-12-31 | No |
| Has the plan failed to provide any benefit when due under the plan | 2015-12-31 | No |
| Contributions received in cash from employer | 2015-12-31 | $13,510,000 |
| Employer contributions (assets) at end of year | 2015-12-31 | $4,810,000 |
| Employer contributions (assets) at beginning of year | 2015-12-31 | $5,420,000 |
| Income. Dividends from common stock | 2015-12-31 | $920,222 |
| Benefit payments and payments to provide benefits directly to participlants or beneficiaries including direct rollovers | 2015-12-31 | $34,346,136 |
| Contract administrator fees | 2015-12-31 | $374,793 |
| Assets. Corporate common stocks other than exployer securities at end of year | 2015-12-31 | $32,318,776 |
| Assets. Corporate common stocks other than exployer securities at beginning of year | 2015-12-31 | $29,466,099 |
| Did the plan have assets held for investment | 2015-12-31 | Yes |
| Did the plan hold any assets whose current value was neither redily determinable on an established market nor set by an independent third party appraiser | 2015-12-31 | No |
| Were all the plan assets eitehr distributed to particpants/beneficiaries, transferred to another plan or brought under the control of the PBGC | 2015-12-31 | No |
| Accountant perfomed limited scope audit pursuant to 29 CFR 2520.103-8 and/or 103-12(d) | 2015-12-31 | No |
| Opinion of an independent qualified public accountant for this plan | 2015-12-31 | Unqualified |
| Accountancy firm name | 2015-12-31 | GRANT THORNTON LLP |
| Accountancy firm EIN | 2015-12-31 | 366055558 |
| 2014 : RETIREMENT PLAN FOR BARGAINING UNIT AND NON-BARGAINING UNIT EMPLOYEES OF NORTHWEST NATURAL GAS COMPANY EMPLOYEES 2014 401k financial data |
|---|
| Unrealized appreciation/depreciation of other (non real estate) assets | 2014-12-31 | $2,030,029 |
| Total unrealized appreciation/depreciation of assets | 2014-12-31 | $2,030,029 |
| Total liabilities at end of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2014-12-31 | $178,808 |
| Total liabilities at beginning of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2014-12-31 | $1,744,243 |
| Total income from all sources (including contributions) | 2014-12-31 | $33,282,013 |
| Total loss/gain on sale of assets | 2014-12-31 | $0 |
| Total of all expenses incurred | 2014-12-31 | $20,199,031 |
| Benefit payments and payments to participlants,beneficiaries,insurance carriers and others | 2014-12-31 | $18,354,487 |
| Total contributions o plan (from employers,participants, others, non cash contrinutions) | 2014-12-31 | $11,820,000 |
| Value of total assets at end of year | 2014-12-31 | $284,763,846 |
| Value of total assets at beginning of year | 2014-12-31 | $273,246,299 |
| Total of administrative expenses incurred including professional, contract, advisory and management fees | 2014-12-31 | $1,844,544 |
| Total interest from all sources | 2014-12-31 | $0 |
| Total dividends received (eg from common stock, registered investment company shares) | 2014-12-31 | $4,074,718 |
| Has a resolution to terminate the plan been adopted during the plan year or any prior plan year | 2014-12-31 | No |
| Total dividends received from registered investment company shares (eg mutual funds) | 2014-12-31 | $3,319,418 |
| Administrative expenses professional fees incurred | 2014-12-31 | $133,873 |
| Was this plan covered by a fidelity bond | 2014-12-31 | Yes |
| Value of fidelity bond cover | 2014-12-31 | $30,000,000 |
| If this is an individual account plan, was there a blackout period | 2014-12-31 | No |
| Total value of distributions paid in property other than in cash, annuity contracts, or publicly traded employer securities | 2014-12-31 | $0 |
| Were there any nonexempt tranactions with any party-in-interest | 2014-12-31 | No |
| Assets. Other investments not covered elsewhere at end of year | 2014-12-31 | $37,066,217 |
| Assets. Other investments not covered elsewhere at beginning of year | 2014-12-31 | $35,696,573 |
| Value of other receiveables (less allowance for doubtful accounts) at end of year | 2014-12-31 | $2,203,733 |
| Value of other receiveables (less allowance for doubtful accounts) at beginning of year | 2014-12-31 | $1,622,294 |
| Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at end of year | 2014-12-31 | $178,808 |
| Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at beginning of year | 2014-12-31 | $1,744,243 |
| Administrative expenses (other) incurred | 2014-12-31 | $912,331 |
| Did the receive any noncash contributions whose value was neither redily determinable on an established market nor set by an independent third party appraiser | 2014-12-31 | No |
| Value of net income/loss | 2014-12-31 | $13,082,982 |
| Value of net assets at end of year (total assets less liabilities) | 2014-12-31 | $284,585,038 |
| Value of net assets at beginning of year (total assets less liabilities) | 2014-12-31 | $271,502,056 |
| Did the plan have a loss casued by fraud or dishonesty (regardless whether reimbursed by fidelity bond) | 2014-12-31 | No |
| Were any loans by the plan or fixed income obligations due to the plan in default | 2014-12-31 | No |
| Were any leases to which the plan was party in default or uncollectible | 2014-12-31 | No |
| Assets. partnership/joint venture interests at end of year | 2014-12-31 | $13,086,914 |
| Assets. partnership/joint venture interests at beginning of year | 2014-12-31 | $12,890,309 |
| Investment advisory and management fees | 2014-12-31 | $522,739 |
| Value of interest in registered invesment companies (eg mutual funds) at end of year | 2014-12-31 | $177,775,037 |
| Value of interest in registered invesment companies (eg mutual funds) at beginning of year | 2014-12-31 | $166,743,168 |
| Value of interest in common/collective trusts at end of year | 2014-12-31 | $18,024,954 |
| Value of interest in common/collective trusts at beginning of year | 2014-12-31 | $17,702,926 |
| Value of interest bearing cash (including money market accounts and certificates of deposits) at end of year | 2014-12-31 | $1,720,892 |
| Interest-bearing cash (include money market accounts & certificates of deposit) at beginning of the Year | 2014-12-31 | $1,966,678 |
| Value of interest bearing cash (including money market accounts and certificates of deposits) at beginning of year | 2014-12-31 | $1,966,678 |
| Net investment gain/loss from registered investment companies (e.g. mutual funds) | 2014-12-31 | $15,236,465 |
| Net investment gain or loss from common/collective trusts | 2014-12-31 | $120,801 |
| Were any plan transactions or series of transactions in excess of 5% of the current value of the plan assets | 2014-12-31 | No |
| Was there a failure to transmit to the plan any participant contributions | 2014-12-31 | No |
| Has the plan failed to provide any benefit when due under the plan | 2014-12-31 | No |
| Contributions received in cash from employer | 2014-12-31 | $11,820,000 |
| Employer contributions (assets) at end of year | 2014-12-31 | $5,420,000 |
| Employer contributions (assets) at beginning of year | 2014-12-31 | $4,100,000 |
| Income. Dividends from common stock | 2014-12-31 | $755,300 |
| Benefit payments and payments to provide benefits directly to participlants or beneficiaries including direct rollovers | 2014-12-31 | $18,354,487 |
| Contract administrator fees | 2014-12-31 | $275,601 |
| Assets. Corporate common stocks other than exployer securities at end of year | 2014-12-31 | $29,466,099 |
| Assets. Corporate common stocks other than exployer securities at beginning of year | 2014-12-31 | $32,524,351 |
| Did the plan have assets held for investment | 2014-12-31 | Yes |
| Did the plan hold any assets whose current value was neither redily determinable on an established market nor set by an independent third party appraiser | 2014-12-31 | No |
| Were all the plan assets eitehr distributed to particpants/beneficiaries, transferred to another plan or brought under the control of the PBGC | 2014-12-31 | No |
| Accountant perfomed limited scope audit pursuant to 29 CFR 2520.103-8 and/or 103-12(d) | 2014-12-31 | No |
| Opinion of an independent qualified public accountant for this plan | 2014-12-31 | Unqualified |
| Accountancy firm name | 2014-12-31 | GRANT THORNTON LLP |
| Accountancy firm EIN | 2014-12-31 | 366055558 |
| 2013 : RETIREMENT PLAN FOR BARGAINING UNIT AND NON-BARGAINING UNIT EMPLOYEES OF NORTHWEST NATURAL GAS COMPANY EMPLOYEES 2013 401k financial data |
|---|
| Unrealized appreciation/depreciation of other (non real estate) assets | 2013-12-31 | $11,241,138 |
| Total unrealized appreciation/depreciation of assets | 2013-12-31 | $11,241,138 |
| Total liabilities at end of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2013-12-31 | $1,744,243 |
| Total liabilities at beginning of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2013-12-31 | $935,160 |
| Total income from all sources (including contributions) | 2013-12-31 | $37,103,258 |
| Total loss/gain on sale of assets | 2013-12-31 | $0 |
| Total of all expenses incurred | 2013-12-31 | $18,780,230 |
| Benefit payments and payments to participlants,beneficiaries,insurance carriers and others | 2013-12-31 | $17,129,475 |
| Total contributions o plan (from employers,participants, others, non cash contrinutions) | 2013-12-31 | $12,500,000 |
| Value of total assets at end of year | 2013-12-31 | $273,246,299 |
| Value of total assets at beginning of year | 2013-12-31 | $254,114,188 |
| Total of administrative expenses incurred including professional, contract, advisory and management fees | 2013-12-31 | $1,650,755 |
| Total interest from all sources | 2013-12-31 | $0 |
| Total dividends received (eg from common stock, registered investment company shares) | 2013-12-31 | $5,608,112 |
| Has a resolution to terminate the plan been adopted during the plan year or any prior plan year | 2013-12-31 | No |
| Total dividends received from registered investment company shares (eg mutual funds) | 2013-12-31 | $4,650,179 |
| Administrative expenses professional fees incurred | 2013-12-31 | $188,493 |
| Was this plan covered by a fidelity bond | 2013-12-31 | Yes |
| Value of fidelity bond cover | 2013-12-31 | $30,000,000 |
| Total value of distributions paid in property other than in cash, annuity contracts, or publicly traded employer securities | 2013-12-31 | $0 |
| Were there any nonexempt tranactions with any party-in-interest | 2013-12-31 | No |
| Assets. Other investments not covered elsewhere at end of year | 2013-12-31 | $35,696,573 |
| Assets. Other investments not covered elsewhere at beginning of year | 2013-12-31 | $32,353,848 |
| Value of other receiveables (less allowance for doubtful accounts) at end of year | 2013-12-31 | $1,622,294 |
| Value of other receiveables (less allowance for doubtful accounts) at beginning of year | 2013-12-31 | $4,847,266 |
| Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at end of year | 2013-12-31 | $1,744,243 |
| Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at beginning of year | 2013-12-31 | $935,160 |
| Other income not declared elsewhere | 2013-12-31 | $3,342,724 |
| Administrative expenses (other) incurred | 2013-12-31 | $658,694 |
| Did the receive any noncash contributions whose value was neither redily determinable on an established market nor set by an independent third party appraiser | 2013-12-31 | No |
| Value of net income/loss | 2013-12-31 | $18,323,028 |
| Value of net assets at end of year (total assets less liabilities) | 2013-12-31 | $271,502,056 |
| Value of net assets at beginning of year (total assets less liabilities) | 2013-12-31 | $253,179,028 |
| Did the plan have a loss casued by fraud or dishonesty (regardless whether reimbursed by fidelity bond) | 2013-12-31 | No |
| Were any loans by the plan or fixed income obligations due to the plan in default | 2013-12-31 | No |
| Were any leases to which the plan was party in default or uncollectible | 2013-12-31 | No |
| Assets. partnership/joint venture interests at end of year | 2013-12-31 | $12,890,309 |
| Assets. partnership/joint venture interests at beginning of year | 2013-12-31 | $12,016,538 |
| Investment advisory and management fees | 2013-12-31 | $566,725 |
| Value of interest in registered invesment companies (eg mutual funds) at end of year | 2013-12-31 | $166,743,168 |
| Value of interest in registered invesment companies (eg mutual funds) at beginning of year | 2013-12-31 | $132,787,676 |
| Value of interest in common/collective trusts at end of year | 2013-12-31 | $17,702,926 |
| Value of interest in common/collective trusts at beginning of year | 2013-12-31 | $27,838,879 |
| Value of interest bearing cash (including money market accounts and certificates of deposits) at end of year | 2013-12-31 | $1,966,678 |
| Interest-bearing cash (include money market accounts & certificates of deposit) at beginning of the Year | 2013-12-31 | $1,458,680 |
| Value of interest bearing cash (including money market accounts and certificates of deposits) at beginning of year | 2013-12-31 | $1,458,680 |
| Net investment gain/loss from registered investment companies (e.g. mutual funds) | 2013-12-31 | $203,943 |
| Net investment gain or loss from common/collective trusts | 2013-12-31 | $4,207,341 |
| Were any plan transactions or series of transactions in excess of 5% of the current value of the plan assets | 2013-12-31 | No |
| Was there a failure to transmit to the plan any participant contributions | 2013-12-31 | No |
| Has the plan failed to provide any benefit when due under the plan | 2013-12-31 | No |
| Contributions received in cash from employer | 2013-12-31 | $12,500,000 |
| Employer contributions (assets) at end of year | 2013-12-31 | $4,100,000 |
| Employer contributions (assets) at beginning of year | 2013-12-31 | $3,300,000 |
| Income. Dividends from common stock | 2013-12-31 | $957,933 |
| Benefit payments and payments to provide benefits directly to participlants or beneficiaries including direct rollovers | 2013-12-31 | $17,129,475 |
| Contract administrator fees | 2013-12-31 | $236,843 |
| Assets. Corporate common stocks other than exployer securities at end of year | 2013-12-31 | $32,524,351 |
| Assets. Corporate common stocks other than exployer securities at beginning of year | 2013-12-31 | $39,511,301 |
| Did the plan have assets held for investment | 2013-12-31 | Yes |
| Did the plan hold any assets whose current value was neither redily determinable on an established market nor set by an independent third party appraiser | 2013-12-31 | No |
| Were all the plan assets eitehr distributed to particpants/beneficiaries, transferred to another plan or brought under the control of the PBGC | 2013-12-31 | No |
| Accountant perfomed limited scope audit pursuant to 29 CFR 2520.103-8 and/or 103-12(d) | 2013-12-31 | No |
| Opinion of an independent qualified public accountant for this plan | 2013-12-31 | Unqualified |
| Accountancy firm name | 2013-12-31 | GRANT THORNTON LLP |
| Accountancy firm EIN | 2013-12-31 | 366055558 |
| 2012 : RETIREMENT PLAN FOR BARGAINING UNIT AND NON-BARGAINING UNIT EMPLOYEES OF NORTHWEST NATURAL GAS COMPANY EMPLOYEES 2012 401k financial data |
|---|
| Total unrealized appreciation/depreciation of assets | 2012-12-31 | $0 |
| Total transfer of assets to this plan | 2012-12-31 | $134,135,363 |
| Total liabilities at end of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2012-12-31 | $935,160 |
| Total liabilities at beginning of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2012-12-31 | $0 |
| Total income from all sources (including contributions) | 2012-12-31 | $14,193,215 |
| Total loss/gain on sale of assets | 2012-12-31 | $0 |
| Total of all expenses incurred | 2012-12-31 | $7,591,994 |
| Benefit payments and payments to participlants,beneficiaries,insurance carriers and others | 2012-12-31 | $7,591,994 |
| Total contributions o plan (from employers,participants, others, non cash contrinutions) | 2012-12-31 | $1,600,000 |
| Value of total assets at end of year | 2012-12-31 | $254,114,188 |
| Value of total assets at beginning of year | 2012-12-31 | $112,442,444 |
| Total of administrative expenses incurred including professional, contract, advisory and management fees | 2012-12-31 | $0 |
| Total interest from all sources | 2012-12-31 | $0 |
| Total dividends received (eg from common stock, registered investment company shares) | 2012-12-31 | $0 |
| Has a resolution to terminate the plan been adopted during the plan year or any prior plan year | 2012-12-31 | No |
| Was this plan covered by a fidelity bond | 2012-12-31 | Yes |
| Value of fidelity bond cover | 2012-12-31 | $40,000,000 |
| Total value of distributions paid in property other than in cash, annuity contracts, or publicly traded employer securities | 2012-12-31 | $0 |
| Were there any nonexempt tranactions with any party-in-interest | 2012-12-31 | No |
| Assets. Other investments not covered elsewhere at end of year | 2012-12-31 | $32,353,848 |
| Assets. Other investments not covered elsewhere at beginning of year | 2012-12-31 | $0 |
| Value of other receiveables (less allowance for doubtful accounts) at end of year | 2012-12-31 | $4,847,266 |
| Value of other receiveables (less allowance for doubtful accounts) at beginning of year | 2012-12-31 | $0 |
| Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at end of year | 2012-12-31 | $935,160 |
| Other liabilities (not benefit claims, operating payabales oe acquisition indebtedness) at beginning of year | 2012-12-31 | $0 |
| Did the receive any noncash contributions whose value was neither redily determinable on an established market nor set by an independent third party appraiser | 2012-12-31 | No |
| Value of net income/loss | 2012-12-31 | $6,601,221 |
| Value of net assets at end of year (total assets less liabilities) | 2012-12-31 | $253,179,028 |
| Value of net assets at beginning of year (total assets less liabilities) | 2012-12-31 | $112,442,444 |
| Did the plan have a loss casued by fraud or dishonesty (regardless whether reimbursed by fidelity bond) | 2012-12-31 | No |
| Were any loans by the plan or fixed income obligations due to the plan in default | 2012-12-31 | No |
| Were any leases to which the plan was party in default or uncollectible | 2012-12-31 | No |
| Assets. partnership/joint venture interests at end of year | 2012-12-31 | $12,016,538 |
| Assets. partnership/joint venture interests at beginning of year | 2012-12-31 | $0 |
| Value of interest in registered invesment companies (eg mutual funds) at end of year | 2012-12-31 | $132,787,676 |
| Value of interest in registered invesment companies (eg mutual funds) at beginning of year | 2012-12-31 | $0 |
| Value of interest in master investment trust accounts at end of year | 2012-12-31 | $0 |
| Value of interest in master investment trust accounts at beginning of year | 2012-12-31 | $102,892,444 |
| Value of interest in common/collective trusts at end of year | 2012-12-31 | $27,838,879 |
| Value of interest in common/collective trusts at beginning of year | 2012-12-31 | $0 |
| Value of interest bearing cash (including money market accounts and certificates of deposits) at end of year | 2012-12-31 | $1,458,680 |
| Were any plan transactions or series of transactions in excess of 5% of the current value of the plan assets | 2012-12-31 | No |
| Was there a failure to transmit to the plan any participant contributions | 2012-12-31 | No |
| Has the plan failed to provide any benefit when due under the plan | 2012-12-31 | No |
| Contributions received in cash from employer | 2012-12-31 | $1,600,000 |
| Employer contributions (assets) at end of year | 2012-12-31 | $3,300,000 |
| Employer contributions (assets) at beginning of year | 2012-12-31 | $9,550,000 |
| Benefit payments and payments to provide benefits directly to participlants or beneficiaries including direct rollovers | 2012-12-31 | $7,591,994 |
| Assets. Corporate common stocks other than exployer securities at end of year | 2012-12-31 | $39,511,301 |
| Assets. Corporate common stocks other than exployer securities at beginning of year | 2012-12-31 | $0 |
| Did the plan have assets held for investment | 2012-12-31 | Yes |
| Did the plan hold any assets whose current value was neither redily determinable on an established market nor set by an independent third party appraiser | 2012-12-31 | No |
| Were all the plan assets eitehr distributed to particpants/beneficiaries, transferred to another plan or brought under the control of the PBGC | 2012-12-31 | No |
| Accountant perfomed limited scope audit pursuant to 29 CFR 2520.103-8 and/or 103-12(d) | 2012-12-31 | No |
| Opinion of an independent qualified public accountant for this plan | 2012-12-31 | Unqualified |
| Accountancy firm name | 2012-12-31 | GRANT THORNTON LLP |
| Accountancy firm EIN | 2012-12-31 | 366055558 |
| 2011 : RETIREMENT PLAN FOR BARGAINING UNIT AND NON-BARGAINING UNIT EMPLOYEES OF NORTHWEST NATURAL GAS COMPANY EMPLOYEES 2011 401k financial data |
|---|
| Total unrealized appreciation/depreciation of assets | 2011-12-31 | $0 |
| Total liabilities at end of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2011-12-31 | $0 |
| Total liabilities at beginning of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2011-12-31 | $0 |
| Total income from all sources (including contributions) | 2011-12-31 | $7,182,961 |
| Total loss/gain on sale of assets | 2011-12-31 | $0 |
| Total of all expenses incurred | 2011-12-31 | $7,680,525 |
| Benefit payments and payments to participlants,beneficiaries,insurance carriers and others | 2011-12-31 | $7,680,525 |
| Total contributions o plan (from employers,participants, others, non cash contrinutions) | 2011-12-31 | $10,300,000 |
| Value of total assets at end of year | 2011-12-31 | $112,442,444 |
| Value of total assets at beginning of year | 2011-12-31 | $112,940,008 |
| Total of administrative expenses incurred including professional, contract, advisory and management fees | 2011-12-31 | $0 |
| Total interest from all sources | 2011-12-31 | $0 |
| Total dividends received (eg from common stock, registered investment company shares) | 2011-12-31 | $0 |
| Has a resolution to terminate the plan been adopted during the plan year or any prior plan year | 2011-12-31 | No |
| Was this plan covered by a fidelity bond | 2011-12-31 | Yes |
| Value of fidelity bond cover | 2011-12-31 | $40,000,000 |
| Total value of distributions paid in property other than in cash, annuity contracts, or publicly traded employer securities | 2011-12-31 | $0 |
| Were there any nonexempt tranactions with any party-in-interest | 2011-12-31 | No |
| Did the receive any noncash contributions whose value was neither redily determinable on an established market nor set by an independent third party appraiser | 2011-12-31 | No |
| Value of net income/loss | 2011-12-31 | $-497,564 |
| Value of net assets at end of year (total assets less liabilities) | 2011-12-31 | $112,442,444 |
| Value of net assets at beginning of year (total assets less liabilities) | 2011-12-31 | $112,940,008 |
| Did the plan have a loss casued by fraud or dishonesty (regardless whether reimbursed by fidelity bond) | 2011-12-31 | No |
| Were any loans by the plan or fixed income obligations due to the plan in default | 2011-12-31 | No |
| Were any leases to which the plan was party in default or uncollectible | 2011-12-31 | No |
| Value of interest in master investment trust accounts at end of year | 2011-12-31 | $102,892,444 |
| Value of interest in master investment trust accounts at beginning of year | 2011-12-31 | $104,443,008 |
| Were any plan transactions or series of transactions in excess of 5% of the current value of the plan assets | 2011-12-31 | No |
| Was there a failure to transmit to the plan any participant contributions | 2011-12-31 | No |
| Has the plan failed to provide any benefit when due under the plan | 2011-12-31 | No |
| Contributions received in cash from employer | 2011-12-31 | $10,300,000 |
| Employer contributions (assets) at end of year | 2011-12-31 | $9,550,000 |
| Employer contributions (assets) at beginning of year | 2011-12-31 | $8,497,000 |
| Benefit payments and payments to provide benefits directly to participlants or beneficiaries including direct rollovers | 2011-12-31 | $7,680,525 |
| Did the plan have assets held for investment | 2011-12-31 | No |
| Did the plan hold any assets whose current value was neither redily determinable on an established market nor set by an independent third party appraiser | 2011-12-31 | No |
| Were all the plan assets eitehr distributed to particpants/beneficiaries, transferred to another plan or brought under the control of the PBGC | 2011-12-31 | No |
| Accountant perfomed limited scope audit pursuant to 29 CFR 2520.103-8 and/or 103-12(d) | 2011-12-31 | No |
| Opinion of an independent qualified public accountant for this plan | 2011-12-31 | Unqualified |
| Accountancy firm name | 2011-12-31 | PRICEWATERHOUSE COOPERS LLP |
| Accountancy firm EIN | 2011-12-31 | 134008324 |
| 2010 : RETIREMENT PLAN FOR BARGAINING UNIT AND NON-BARGAINING UNIT EMPLOYEES OF NORTHWEST NATURAL GAS COMPANY EMPLOYEES 2010 401k financial data |
|---|
| Total unrealized appreciation/depreciation of assets | 2010-12-31 | $0 |
| Total liabilities at end of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2010-12-31 | $0 |
| Total liabilities at beginning of year (benefit claims payable, operating payabales, acquisition indebtedness and other liabilities) | 2010-12-31 | $0 |
| Total income from all sources (including contributions) | 2010-12-31 | $22,918,126 |
| Total loss/gain on sale of assets | 2010-12-31 | $0 |
| Total of all expenses incurred | 2010-12-31 | $7,898,409 |
| Benefit payments and payments to participlants,beneficiaries,insurance carriers and others | 2010-12-31 | $7,898,409 |
| Total contributions o plan (from employers,participants, others, non cash contrinutions) | 2010-12-31 | $11,197,000 |
| Value of total assets at end of year | 2010-12-31 | $112,940,008 |
| Value of total assets at beginning of year | 2010-12-31 | $97,920,291 |
| Total of administrative expenses incurred including professional, contract, advisory and management fees | 2010-12-31 | $0 |
| Total interest from all sources | 2010-12-31 | $0 |
| Total dividends received (eg from common stock, registered investment company shares) | 2010-12-31 | $0 |
| Has a resolution to terminate the plan been adopted during the plan year or any prior plan year | 2010-12-31 | No |
| Was this plan covered by a fidelity bond | 2010-12-31 | Yes |
| Value of fidelity bond cover | 2010-12-31 | $40,000,000 |
| Total value of distributions paid in property other than in cash, annuity contracts, or publicly traded employer securities | 2010-12-31 | $0 |
| Were there any nonexempt tranactions with any party-in-interest | 2010-12-31 | No |
| Did the receive any noncash contributions whose value was neither redily determinable on an established market nor set by an independent third party appraiser | 2010-12-31 | No |
| Value of net income/loss | 2010-12-31 | $15,019,717 |
| Value of net assets at end of year (total assets less liabilities) | 2010-12-31 | $112,940,008 |
| Value of net assets at beginning of year (total assets less liabilities) | 2010-12-31 | $97,920,291 |
| Did the plan have a loss casued by fraud or dishonesty (regardless whether reimbursed by fidelity bond) | 2010-12-31 | No |
| Were any loans by the plan or fixed income obligations due to the plan in default | 2010-12-31 | No |
| Were any leases to which the plan was party in default or uncollectible | 2010-12-31 | No |
| Value of interest in master investment trust accounts at end of year | 2010-12-31 | $104,443,008 |
| Value of interest in master investment trust accounts at beginning of year | 2010-12-31 | $93,620,291 |
| Were any plan transactions or series of transactions in excess of 5% of the current value of the plan assets | 2010-12-31 | No |
| Was there a failure to transmit to the plan any participant contributions | 2010-12-31 | No |
| Has the plan failed to provide any benefit when due under the plan | 2010-12-31 | No |
| Contributions received in cash from employer | 2010-12-31 | $11,197,000 |
| Employer contributions (assets) at end of year | 2010-12-31 | $8,497,000 |
| Employer contributions (assets) at beginning of year | 2010-12-31 | $4,300,000 |
| Benefit payments and payments to provide benefits directly to participlants or beneficiaries including direct rollovers | 2010-12-31 | $7,898,409 |
| Did the plan have assets held for investment | 2010-12-31 | No |
| Did the plan hold any assets whose current value was neither redily determinable on an established market nor set by an independent third party appraiser | 2010-12-31 | No |
| Were all the plan assets eitehr distributed to particpants/beneficiaries, transferred to another plan or brought under the control of the PBGC | 2010-12-31 | No |
| Accountant perfomed limited scope audit pursuant to 29 CFR 2520.103-8 and/or 103-12(d) | 2010-12-31 | No |
| Opinion of an independent qualified public accountant for this plan | 2010-12-31 | Unqualified |
| Accountancy firm name | 2010-12-31 | PRICEWATERHOUSE COOPERS LLP |
| Accountancy firm EIN | 2010-12-31 | 134008324 |
| 2009 : RETIREMENT PLAN FOR BARGAINING UNIT AND NON-BARGAINING UNIT EMPLOYEES OF NORTHWEST NATURAL GAS COMPANY EMPLOYEES 2009 401k financial data |
|---|
| Total value of distributions paid in property other than in cash, annuity contracts, or publicly traded employer securities | 2009-12-31 | $0 |
