PROPERTY, PLANT AND EQUIPMENT AND CONSTRUCTION-IN-PROCESS - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Property, Plant and Equipment [Line Items]
Depreciation, total	$ 222,200	$ 186,500	$ 163,200
Depreciation net of amortization of cash grant	6,900	6,900	7,500
Property, plant and equipment including construction in progress, net	3,429,700	3,059,700
Property, plant and equipment, cash grant, net	121,100	128,000
Impairment of long-lived assets	$ 1,280	0	32,648
Kenya Power and Lighting Co Limited
Property, Plant and Equipment [Line Items]
Power purchase agreements term (year)	20 years
Geotermica Platanares
Property, Plant and Equipment [Line Items]
Property, plant and equipment including construction in progress, net	$ 74,900	81,900
Power plant usage agreement term (year)	15 years
Geotermica Platanares | ENEE
Property, Plant and Equipment [Line Items]
Power purchase agreements term (year)	30 years
Geothermie Bouillante SA (“GB”)
Property, Plant and Equipment [Line Items]
Property, plant and equipment including construction in progress, net	$ 112,400	$ 101,700
Geothermie Bouillante SA (“GB”) | EDF
Property, Plant and Equipment [Line Items]
Power purchase agreements term (year)	15 years
North Brawley Geothermal Power Plant
Property, Plant and Equipment [Line Items]
Property, plant, and equipment, fair value disclosure			13,600
Impairment of long-lived assets			$ 30,500
Weighted average cost of capital		9.00%
Orzunil I de Electricidad, Limitada
Property, Plant and Equipment [Line Items]
Property, plant and equipment including construction in progress, net	$ 30,600	$ 31,900
Ortitlan Limitada
Property, Plant and Equipment [Line Items]
Property, plant and equipment including construction in progress, net	$ 41,000	42,800
Orzunil I de Electricidad, Limitada
Property, Plant and Equipment [Line Items]
Subsidiary, ownership percentage by parent	97.00%
Foreign countries
Property, Plant and Equipment [Line Items]
Property, plant and equipment including construction in progress, net	$ 827,800	754,200
Kenya | Power Plants
Property, Plant and Equipment [Line Items]
Property, plant and equipment including construction in progress, net	$ 382,700	$ 377,600