DERIVATIVES (Volumes of Outstanding Derivative Contracts) (Details)	Jun. 30, 2024 MMBTU MWh	Dec. 31, 2023 MMBTU MWh
Forwards, futures, and swaps | Natural Gas (MMBtus)
Derivative [Line Items]
Contract Volume	274,047,264	196,063,296
Forwards, futures, and swaps | Electricity (MWh)
Derivative [Line Items]
Contract Volume | MWh	9,989,125	9,169,967
Options | Natural Gas (MMBtus)
Derivative [Line Items]
Contract Volume	50,622,500	30,695,000
Options | Electricity (MWh)
Derivative [Line Items]
Contract Volume	1,355,200	92,400
Congestion revenue rights | Electricity (MWh)
Derivative [Line Items]
Contract Volume | MWh	147,542,438	170,465,674