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DERIVATIVES (Volumes of Outstanding Derivative Contracts) (Details) | Sep. 30, 2025 MWh MMBTU | Dec. 31, 2024 MMBTU MWh
--- | --- | ---
Natural Gas | Forwards, futures, and swaps |  |
Derivative [Line Items] |  |
Contract Volume | 274,903,478 | 179,257,247
Natural Gas | Options |  |
Derivative [Line Items] |  |
Contract Volume | 76,780,000 | 37,717,500
Electricity (MWh) | Forwards, futures, and swaps |  |
Derivative [Line Items] |  |
Contract Volume | MWh | 7,698,933 | 8,576,078
Electricity (MWh) | Options |  |
Derivative [Line Items] |  |
Contract Volume | 1,036,400 | 1,663,200
Electricity (MWh) | Congestion Revenue Rights |  |
Derivative [Line Items] |  |
Contract Volume | MWh | 101,477,325 | 123,040,895

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