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COMMITMENTS AND CONTINGENCIES - Spent Nuclear Fuel Obligations Narrative (Details) - USD ($) $ in Thousands |  |  |  |  | 1 Months Ended | 12 Months Ended
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Mar. 25, 2021 | Jun. 12, 2019 | Feb. 21, 2019 | May 22, 2017 | Dec. 31, 2019 | Jul. 31, 2019 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Guarantor Obligations [Line Items] |  |  |  |  |  |  |  |  |
Net of damages awarded |  | $ 500 |  |  |  |  |  |  |
Remaining damages sought |  | $ 1,000 |  |  |  |  |  |  |
Damages paid |  |  |  |  |  | $ 500 |  |  |
DOE settlement payment |  |  |  |  | $ 29,000 |  | $ 0 | $ 0 | $ (29,000)
Yankee Companies |  |  |  |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |  |  |  |
Damages sought | $ 120,400 |  |  | $ 104,400 |  |  |  |  |
YAEC |  |  |  |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |  |  |  |
Net of damages awarded |  |  |  |  | 2,800 |  |  |  |
Total amount of damages awarded |  |  |  |  | 5,400 |  |  |  |
MYAPC |  |  |  |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |  |  |  |
Net of damages awarded |  |  |  |  | 5,000 |  |  |  |
Total amount of damages awarded |  |  |  |  | $ 21,000 |  |  |  |
CYAPC, YAEC, And MYAPC |  |  |  |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |  |  |  |
Net of damages awarded |  |  | $ 103,200 |  |  |  |  |  |
CYAPC |  |  |  |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |  |  |  |
Net of damages awarded |  |  | 40,700 |  |  |  |  |  |
YAEC |  |  |  |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |  |  |  |
Net of damages awarded |  |  | 28,100 |  |  |  |  |  |
MYAPC |  |  |  |  |  |  |  |  |
Guarantor Obligations [Line Items] |  |  |  |  |  |  |  |  |
Net of damages awarded |  |  | $ 34,400 |  |  |  |  |  |

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