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DERIVATIVES (Volumes of Outstanding Derivative Contracts) (Details)	Mar. 31, 2022 MMBTU MWh	Dec. 31, 2021 MMBTU MWh
Forwards, Futures and Swaps | Natural Gas (MMBtus)
Derivative [Line Items]
Contract Volume	187,529,848	173,361,635
Forwards, Futures and Swaps | Electricity (Megawatt-hours)
Derivative [Line Items]
Contract Volume | MWh	11,155,427	10,283,639
Options | Natural Gas (MMBtus)
Derivative [Line Items]
Contract Volume	7,450,000	14,420,000
Options | Electricity (Megawatt-hours)
Derivative [Line Items]
Contract Volume	543,600	288,000
Congestion revenue rights | Electricity (Megawatt-hours)
Derivative [Line Items]
Contract Volume | MWh	235,009,420	239,857,610

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=125515794&loc=SL5579245-113959

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