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VARIABLE INTEREST ENTITIES - Narrative (Details)
6 Months Ended
Jun. 30, 2024
Variable Interest Entity, Primary Beneficiary | Springerville Unit 3 Lease  
Variable Interest Entity [Line Items]  
Financial and other support provided (as a percent) 100.00%
Springerville Partnership  
Variable Interest Entity [Line Items]  
Equity interest (as a percent) 51.00%
General partner interest (as a percent) 1.00%
Springerville Partnership | Other Limited Partners  
Variable Interest Entity [Line Items]  
Ownership interest held by noncontrolling interest (as a percent) 49.00%
Springerville Unit 3 Holding LLC | Variable Interest Entity, Primary Beneficiary  
Variable Interest Entity [Line Items]  
Ownership interest held by parent (as a percent) 100.00%