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GENERAL AND BASIS OF PRESENTATION - Business combination - Enel purchase transaction (Details) - Enel Green Power North America ("EGPNA") $ in Millions		3 Months Ended		6 Months Ended	12 Months Ended
	Jan. 04, 2024 USD ($) geothermalPowerPlant tripleHybridPowerPlant solarPowerPlant greenfieldDevelopmentAsset	Jun. 30, 2024 USD ($)	Mar. 31, 2024 USD ($)	Jun. 30, 2024 USD ($)	Dec. 31, 2023 USD ($)
Business Acquisition [Line Items]
Number of contracted geothermal power plants, business combination \| geothermalPowerPlant	2
Number of triple hybrid power plant, business Combination \| tripleHybridPowerPlant	1
Number of solar power plants, business combination \| solarPowerPlant	2
Number Of Greenfield Development Assets, Business Combination \| greenfieldDevelopmentAsset	2
Business combination, consideration transferred	$ 274.6
Business acquisition, percentage of voting interests acquired	100.00%
Business combination, acquisition related costs		$ 0.0	$ 1.3		$ 1.1
Electricity
Business Acquisition [Line Items]
Business combination, pro forma information, revenue of acquiree since acquisition date, actual		8.6		$ 18.0
Business combination, pro forma information, earnings or loss of acquiree since acquisition date, actual		$ 2.6		$ 5.9