INCOME TAXES - Narrative (Details) - USD ($) $ in Thousands				1 Months Ended	6 Months Ended	12 Months Ended
	Jul. 08, 2024	Apr. 23, 2024	Apr. 24, 2018	Sep. 30, 2019	Jun. 30, 2023	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2015
Operating Loss Carryforwards [Line Items]
Valuation allowance						$ 2,700	$ 2,870	$ 2,473
Valuation allowance, deferred tax asset, decrease							200
Unrecognized tax benefits that would impact effective tax rate						6,300	$ 8,700
Kenya revenue authority, statutory
Operating Loss Carryforwards [Line Items]
Income tax examination, estimate of possible loss	$ 0	$ 79,000
U.S. Geothermal
Operating Loss Carryforwards [Line Items]
Business acquisition, percentage of coting interests acquired			100.00%
Business combination, consideration transferred, total			$ 110,000
Business combination recognized identifiable assets acquired and liabilities assumed, deferred tax assets (liabilities), net			1,700
Deferred taxes, business combination, valuation allowance, available to reduce deferred tax asset			1,800
Domestic tax jurisdiction
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards						$ 32,900
Open tax year						2006
Domestic tax jurisdiction | U.S. Geothermal
Operating Loss Carryforwards [Line Items]
Deferred income taxes			113,900
Domestic tax jurisdiction | PTCs
Operating Loss Carryforwards [Line Items]
Tax credit carryforward						$ 109,700
Tax credit carryforward, expiration period						20 years
Domestic tax jurisdiction | PTCs | Minimum
Operating Loss Carryforwards [Line Items]
Tax credit carryforward, expiration year						2026
Domestic tax jurisdiction | ITCs
Operating Loss Carryforwards [Line Items]
Tax credit carryforward						$ 8,800
Tax credit carryforward, expiration period						22 years
Domestic tax jurisdiction | ITCs | Minimum
Operating Loss Carryforwards [Line Items]
Tax credit carryforward, expiration year						2046
Foreign tax jurisdiction
Operating Loss Carryforwards [Line Items]
Tax credit carryforward						$ 30,900
Tax credit carryforward, expiration period						10 years
Foreign tax jurisdiction | Israel tax authority
Operating Loss Carryforwards [Line Items]
Foreign income tax expense (benefit), continuing operations, total						$ 15,000
Foreign tax jurisdiction | Israel tax authority | Ormat Systems Ltd
Operating Loss Carryforwards [Line Items]
Effective income tax rate										16.00%
Foreign tax jurisdiction | Guadeloupe tax authority
Operating Loss Carryforwards [Line Items]
National corporate tax rate								25.00%	26.50%
Foreign tax jurisdiction | Tax authority of Guatemala in Guatemala
Operating Loss Carryforwards [Line Items]
National corporate tax rate						25.00%
Effective income tax rate						7.00%
Foreign tax jurisdiction | Sistema de Administración de Rentas
Operating Loss Carryforwards [Line Items]
Income taxes exempt period				10 years
Foreign tax jurisdiction | Kenya revenue authority, statutory
Operating Loss Carryforwards [Line Items]
National corporate tax rate					37.50%	30.00%
Foreign tax jurisdiction | Kenya revenue authority, corporate
Operating Loss Carryforwards [Line Items]
National corporate tax rate					37.50%	30.00%
Foreign tax jurisdiction | Minimum
Operating Loss Carryforwards [Line Items]
Tax credit carryforward, expiration year						2027
State and local jurisdiction
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards						$ 244,500
Operating loss carryforwards subject to expiration						239,800
Operating loss carryforwards not subject to expiration						$ 4,700
Open tax year						2010
State and local jurisdiction | U.S. Geothermal
Operating Loss Carryforwards [Line Items]
Deferred income taxes			$ 49,900
State and local jurisdiction | Minimum
Operating Loss Carryforwards [Line Items]
Tax credit carryforward, expiration year						2025
State and local jurisdiction | Maximum
Operating Loss Carryforwards [Line Items]
Tax credit carryforward, expiration year						2044