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DERIVATIVES (Volumes of Outstanding Derivative Contracts, in Megawatt Hours Unless Otherwise Specified) (Details) | Sep. 30, 2021 MWh MMBTU | Dec. 31, 2020 MWh MMBTU
--- | --- | ---
Forwards, Futures and Swaps | Natural Gas |  |
Derivative [Line Items] |  |
Contract Volume (mmbtu and mwh) | MMBTU | 187,134,065 | 146,642,863
Forwards, Futures and Swaps | Electricity |  |
Derivative [Line Items] |  |
Contract Volume (mmbtu and mwh) | 11,652,406 | 9,435,830
Options | Natural Gas |  |
Derivative [Line Items] |  |
Contract Volume (mmbtu and mwh) | MMBTU | 50,880,000 | 14,140,000
Options | Electricity |  |
Derivative [Line Items] |  |
Contract Volume (mmbtu and mwh) | 184,800 | 0
Congestion Revenue Rights | Electricity |  |
Derivative [Line Items] |  |
Contract Volume (mmbtu and mwh) | 247,960,149 | 266,091,470

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