DERIVATIVES (Volumes of Outstanding Derivative Contracts) (Details)	Jun. 30, 2025 MMBTU MWh	Dec. 31, 2024 MMBTU MWh
Natural Gas | Forwards, futures, and swaps
Derivative [Line Items]
Contract Volume	293,476,836	179,257,247
Natural Gas | Options
Derivative [Line Items]
Contract Volume	53,165,000	37,717,500
Electricity (MWh) | Forwards, futures, and swaps
Derivative [Line Items]
Contract Volume | MWh	8,729,140	8,576,078
Electricity (MWh) | Options
Derivative [Line Items]
Contract Volume	1,878,000	1,663,200
Electricity (MWh) | Congestion Revenue Rights
Derivative [Line Items]
Contract Volume | MWh	103,445,748	123,040,895