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INCOME TAXES (Details) - USD ($) $ in Thousands |  |  |  | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2019 | May 22, 2018 | Dec. 31, 2016 | Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2024 | Dec. 31, 2021 | Dec. 31, 2020
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |  |
Federal statutory rate |  |  |  |  |  | 24.50% | 35.00% |  |  |
Change in tax rate, deferred tax liability, provisional income tax (expense) benefit |  |  |  |  |  | $ 228,400 |  |  |  |
Change in tax rate, deferred income taxes |  |  |  |  |  | 164,300 |  |  |  |
Change in tax rate, provisional income tax expense (benefit) |  |  |  |  |  | 64,100 |  |  |  |
Initial revaluation of excess deferred income taxes |  |  | $ 20,100 |  |  |  |  |  |  |
Overcollection of taxes |  |  | 9,000 |  |  |  |  |  |  |
Deferred income tax expense (benefit), remeasurement |  |  |  |  |  | 14,300 |  |  |  |
Amortization of excess deferred income taxes |  |  |  |  |  | 1,800 |  |  |  |
Revaluation of deferred income taxes not included in base rates |  |  |  |  |  | 880 |  |  |  |
Regulatory liability, excess deferred income taxes |  |  |  |  |  | 205,400 |  |  |  |
Tax estimate adjustment |  |  |  |  |  | (2,100) |  |  |  |
Deferred Tax Assets, Operating Loss Carryforwards, Domestic, Refundable and Receivables |  |  |  |  |  | $ 23,000 | $ 15,400 |  |  |
Net operating losses, life |  |  |  |  |  | 20 years |  |  |  |
Federal net operating losses | [1] |  |  |  |  | $ 24,500 | 28,487 |  |  |
Valuation allowance |  |  |  |  |  | 4,000 | 1,000 |  |  |
Investment tax credit, project phase out |  |  |  | 3 years |  |  |  |  |  |
Domestic Tax Authority |  |  |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |  |
Net operating losses |  |  |  |  |  | 136,800 | 125,300 |  |  |
State and Local Jurisdiction |  |  |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |  |
Net operating losses |  |  |  |  |  | 578,800 | 471,700 |  |  |
Forecast |  |  |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |  |
Federal statutory rate |  |  |  |  | 21.00% |  |  |  |  |
Investment tax credit, solar property, percentage |  | 30.00% |  |  |  |  |  | 10.00% | 22.00% | 26.00%
Investment tax credit, project phase out |  | 5 years |  |  |  |  |  |  |  |
March 2018 BGSS/CIP Filing |  |  |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |  |
Approved customer refunds |  |  | $ 31,000 |  |  |  |  |  |  |
Clean Energy Ventures |  |  |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |  |
Tax credit carryforward |  |  |  |  |  | 121,100 | 109,300 |  |  |
Natural Gas Distribution |  |  |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |  |
Income tax expense (benefit) provision |  |  |  |  |  | 17,000 |  |  |  |
Tax credit carryforward |  |  |  |  |  | $ 2,200 | $ 2,300 |  |  |
Minimum | State and Local Jurisdiction |  |  |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |  |
Net operating losses, life |  |  |  |  |  | 7 years |  |  |  |
Maximum |  |  |  |  |  |  |  |  |  |
Income Tax Contingency [Line Items] |  |  |  |  |  |  |  |  |  |
Net operating losses, life |  |  |  |  |  | 20 years |  |  |  |
[1] | See discussion of federal net operating loss utilization in the Other Tax Items section of this note.

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