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DERIVATIVES (Volumes of Outstanding Derivative Contracts) (Details) | Mar. 31, 2023 MMBTU MWh | Dec. 31, 2022 MMBTU MWh
--- | --- | ---
Forwards, Futures and Swaps | Natural Gas (MMBtus) |  |
Derivative [Line Items] |  |
Contract Volume | 215,660,888 | 171,212,813
Forwards, Futures and Swaps | Electricity (MWh) |  |
Derivative [Line Items] |  |
Contract Volume | MWh | 9,868,692 | 10,814,728
Options | Natural Gas (MMBtus) |  |
Derivative [Line Items] |  |
Contract Volume | 17,850,000 | 27,785,000
Options | Electricity (MWh) |  |
Derivative [Line Items] |  |
Contract Volume | 431,200 | 215,600
Congestion revenue rights | Electricity (MWh) |  |
Derivative [Line Items] |  |
Contract Volume | MWh | 193,890,914 | 205,743,505

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