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Income tax Income tax (Notes) | 9 Months Ended
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Sep. 30, 2021
Income Tax Disclosure [Abstract] |
Income Tax Disclosure [Text Block] | INCOME TAXES Income tax expense for interim periods is based on the estimated annual effective tax rate, which includes tax credits, regulatory flow-through adjustments, and other items, applied to the Company’s year-to-date, pre-tax income. The change from pre-tax book loss for the three months ended September 30, 2020 to pre-tax book income for the three months ended September 30, 2021 is the primary driver for the change in interim effective tax rate results. The significant differences between the U.S. Federal statutory tax rate and PGE’s effective tax rate are reflected in the following table:
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2021 |  | 2020 |  | 2021 |  | 2020
Federal statutory tax rate | 21.0 | % |  | 21.0 | % |  | 21.0 | % |  | 21.0 | %
Federal tax credits* | (11.2) |  |  | 14.8 |  |  | (10.1) |  |  | (23.6) |
State and local taxes, net of federal tax benefit | 8.9 |  |  | 4.2 |  |  | 8.7 |  |  | 10.4 |
Flow-through depreciation and cost basis differences | (1.5) |  |  | 17.5 |  |  | (1.0) |  |  | (7.2) |
Amortization of excess deferred income tax | (4.6) |  |  | (0.4) |  |  | (3.7) |  |  | (2.8) |
Local tax flow-through adjustment | — |  |  | — |  |  | (4.2) |  |  | — |
Other | (3.5) |  |  | 4.3 |  |  | (1.5) |  |  | (1.8) |
Effective tax rate | 9.1 | % |  | 61.4 | % |  | 9.2 | % |  | (4.0) | %
* Federal tax credits primarily consist of production tax credits (PTCs) earned from Company-owned wind-powered generating facilities. PTCs are earned based on a per-kilowatt hour rate and, as a result, the annual amount of PTCs earned will vary based on weather conditions and availability of the facilities. PTCs are earned for 10 years from the in-service dates of the corresponding facilities. PGE’s wind-powered generating facilities are eligible to earn PTCs until various dates through 2030. Local tax flow-through adjustment The Company is subject to a local tax that is recovered through a supplemental tariff based on current tax expense, but for which the Company has also recognized deferred income tax expenses over time. Because it is probable that the local deferred taxes will be flowed through future customer prices in accordance with the supplemental tariff, PGE determined a corresponding regulatory asset should have been recorded. In the first quarter of 2021, PGE recognized a regulatory asset to defer previously recorded deferred income tax expenses in the amount of $9 million with a corresponding credit to Income tax expense reflected in the condensed consolidated statements of income for the nine months ended September 30, 2021. The adjustment has no impact to the three months ended September 30, 2021, and is immaterial to prior-year periods. Carryforwards Federal tax credit carryforwards as of September 30, 2021 and December 31, 2020 were $98 million and $77 million, respectively. These credits primarily consist of PTCs, which will expire at various dates through 2041. PGE believes that it is more likely than not that its deferred income tax assets as of September 30, 2021 will be realized; accordingly, no valuation allowance has been recorded. As of September 30, 2021, and December 31, 2020, PGE had no material unrecognized tax benefits.

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- Definition The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 21 -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32857-109319 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SAB Topic 11.C) -URI http://asc.fasb.org/extlink&oid=122134291&loc=d3e330215-122817 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 17 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32809-109319 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB TOPIC 6.I.5.Q1) -URI http://asc.fasb.org/extlink&oid=122134291&loc=d3e330036-122817 Reference 5: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 14 -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32705-109319 Reference 6: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 270 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6424409&loc=d3e44925-109338 Reference 7: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -URI http://asc.fasb.org/topic&trid=2144680 Reference 8: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 30 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6424122&loc=d3e41874-109331 Reference 9: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(h)(2)) -URI http://asc.fasb.org/extlink&oid=120395691&loc=d3e23780-122690 + Details
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