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DERIVATIVES (Volumes of Outstanding Derivative Contracts) (Details) | Mar. 31, 2022 MMBTU MWh | Dec. 31, 2021 MMBTU MWh
--- | --- | ---
Forwards, Futures and Swaps | Natural Gas (MMBtus) |  |
Derivative [Line Items] |  |
Contract Volume | 187,529,848 | 173,361,635
Forwards, Futures and Swaps | Electricity (Megawatt-hours) |  |
Derivative [Line Items] |  |
Contract Volume | MWh | 11,155,427 | 10,283,639
Options | Natural Gas (MMBtus) |  |
Derivative [Line Items] |  |
Contract Volume | 7,450,000 | 14,420,000
Options | Electricity (Megawatt-hours) |  |
Derivative [Line Items] |  |
Contract Volume | 543,600 | 288,000
Congestion revenue rights | Electricity (Megawatt-hours) |  |
Derivative [Line Items] |  |
Contract Volume | MWh | 235,009,420 | 239,857,610

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