DERIVATIVES (Volumes of Outstanding Derivative Contracts) (Details)	Sep. 30, 2024 MWh MMBTU	Dec. 31, 2023 MMBTU MWh
Forwards, futures, and swaps | Natural Gas (MMBtus)
Derivative [Line Items]
Contract Volume	234,343,041	196,063,296
Forwards, futures, and swaps | Electricity (MWh)
Derivative [Line Items]
Contract Volume | MWh	8,728,780	9,169,967
Options | Natural Gas (MMBtus)
Derivative [Line Items]
Contract Volume	67,147,500	30,695,000
Options | Electricity (MWh)
Derivative [Line Items]
Contract Volume	1,386,000	92,400
Congestion Revenue Rights | Electricity (MWh)
Derivative [Line Items]
Contract Volume | MWh	132,840,444	170,465,674