DERIVATIVES (Volumes of Outstanding Derivative Contracts) (Details)	Dec. 31, 2023 MMBTU MWh	Dec. 31, 2022 MMBTU MWh
Forwards, Futures and Swaps | Natural Gas (MMBtus)
Derivative [Line Items]
Contract Volume	196,063,296	171,212,813
Forwards, Futures and Swaps | Electricity (MWh)
Derivative [Line Items]
Contract Volume | MWh	9,169,967	10,814,728
Options | Natural Gas (MMBtus)
Derivative [Line Items]
Contract Volume	30,695,000	27,785,000
Options | Electricity (MWh)
Derivative [Line Items]
Contract Volume	92,400	215,600
Congested Revenue Rights | Electricity (MWh)
Derivative [Line Items]
Contract Volume | MWh	170,465,674	205,743,505