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Income tax Income tax (Notes) | 9 Months Ended
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Sep. 30, 2019
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 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,
| 2019 |  | 2018 |  | 2019 |  | 2018
Federal statutory tax rate | 21.0 | % |  | 21.0 | % |  | 21.0 | % |  | 21.0 | %
Federal tax credits* | (14.8 | ) |  | (12.3 | ) |  | (13.8 | ) |  | (15.8 | )
State and local taxes, net of federal tax benefit | 6.5 |  |  | 6.5 |  |  | 6.5 |  |  | 6.5 |
Flow through depreciation and cost basis differences | 1.0 |  |  | (0.1 | ) |  | 1.2 |  |  | (2.3 | )
Amortization of excess deferred income tax | (3.9 | ) |  | — |  |  | (3.5 | ) |  | — |
Other | — |  |  | (0.6 | ) |  | 0.2 |  |  | 3.0 |
Effective tax rate | 9.8 | % |  | 14.5 | % |  | 11.6 | % |  | 12.4 | %
* Federal tax credits consists 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 2024. Carryforwards Federal tax credit carryforwards as of September 30, 2019 and December 31, 2018 were $55 million and $52 million, respectively. These credits consist of PTCs which will expire at various dates through 2039. PGE believes that it is more likely than not that its deferred income tax assets as of September 30, 2019 will be realized; accordingly, no valuation allowance has been recorded. As of September 30, 2019, and December 31, 2018, PGE had no 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://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -URI http://asc.fasb.org/topic&trid=2144680 + Details
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