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DERIVATIVES (Volumes of Outstanding Derivative Contracts) (Details)	Mar. 31, 2025 MMBTU MWh	Dec. 31, 2024 MMBTU MWh
Natural Gas | Forwards, futures, and swaps
Derivative [Line Items]
Contract Volume	176,395,613	179,257,247
Natural Gas | Options
Derivative [Line Items]
Contract Volume	38,770,000	37,717,500
Electricity (MWh) | Forwards, futures, and swaps
Derivative [Line Items]
Contract Volume | MWh	8,509,874	8,576,078
Electricity (MWh) | Options
Derivative [Line Items]
Contract Volume	2,463,200	1,663,200
Electricity (MWh) | Congestion Revenue Rights
Derivative [Line Items]
Contract Volume | MWh	116,765,301	123,040,895

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