DERIVATIVES (Volumes of Outstanding Derivative Contracts) (Details)	Dec. 31, 2024 MMBTU MWh	Dec. 31, 2023 MMBTU MWh
Forwards, futures, and swaps | Natural Gas
Derivative [Line Items]
Contract Volume	179,257,247	196,063,296
Forwards, futures, and swaps | Electricity (MWh)
Derivative [Line Items]
Contract Volume | MWh	8,576,078	9,169,967
Options | Natural Gas
Derivative [Line Items]
Contract Volume	37,717,500	30,695,000
Options | Electricity (MWh)
Derivative [Line Items]
Contract Volume	1,663,200	92,400
Congestion Revenue Rights | Electricity (MWh)
Derivative [Line Items]
Contract Volume | MWh	123,040,895	170,465,674