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PROPERTY, PLANT AND EQUIPMENT AND CONSTRUCTION-IN-PROCESS
 12 Months Ended
Dec. 31, 2024
Property, Plant and Equipment [Abstract]  
PROPERTY, PLANT AND EQUIPMENT AND CONSTRUCTION-IN-PROCESS PROPERTY, PLANT AND EQUIPMENT AND CONSTRUCTION-IN-PROCESS
 Property, Plant and Equipment
 Property, plant and equipment, net, consist of the following:
December 31,
20242023
(Dollars in thousands)
Land owned by the Company where the geothermal resource is located $51,500 $47,612 
Leasehold improvements 12,746 12,588 
Machinery and equipment 389,252 341,931 
Land, buildings and office equipment 145,272 127,970 
Vehicles20,159 17,097 
Energy storage equipment324,065 158,604 
Solar facility equipment97,502 59,214 
Geothermal and recovered energy generation power plants, including geothermal wells and exploration and resource development costs:
United States of America, net of cash grants 3,585,209 3,191,505 
Foreign countries 919,680 868,289 
Asset retirement cost 59,831 59,123 
Total cost of property, plant and equipment
5,605,216 4,883,933 
Less accumulated depreciation (2,103,330)(1,884,984)
Property, plant and equipment, net $3,501,886 $2,998,949 
 
Depreciation expense for the years ended December 31, 2024, 2023 and 2022 amounted to $222.2 million, $186.5 million and $163.2 million, respectively. Depreciation expense for the years ended December 31, 2024, 2023, and 2022 is net of the impact of the cash grant in the amount of $6.9 million, $6.9 million and $7.5 million, respectively.
 U.S. Operations
 The net book value of the property, plant and equipment, including construction-in-process, located in the United States was approximately $3,429.7 million and $3,059.7 million as of December 31, 2024 and 2023, respectively. These amounts as of December 31, 2024 and 2023 are net of cash grants in the amount of $121.1 million and $128.0 million, respectively.
 Foreign Operations
 The net book value of property, plant and equipment, including construction-in-process, located outside of the United States was approximately $827.8 million and $754.2 million as of December 31, 2024 and 2023, respectively.
 The Company, through its wholly owned subsidiary, OrPower 4, Inc. (“OrPower 4”), owns and operates geothermal power plants in Kenya. The net book value of assets associated with the power plants was $382.7 million and $377.6 million as of December 31, 2024 and 2023, respectively. The Company sells the electricity produced by the power plants to Kenya Power and Lighting Co. Ltd. (“KPLC”) under a 20-year PPA ending between 2033 and 2036.
The Company, through its wholly owned subsidiary, Orzunil I de Electricidad, Limitada (“Orzunil”), owns a 97% interest in a geothermal power plant in Guatemala. The net book value of the assets related to the power plant was $30.6 million and $31.9 million at December 31, 2024 and 2023, respectively. The Company sells the electricity produced by the power plants to INDE, a Guatemalan power company under a PPA ending in 2034.
 The Company, through its wholly owned subsidiary, Ortitlan, Limitada (“Ortitlan”), owns a power plant in Guatemala. The net book value of the assets related to the power plant was $41.0 million and $42.8 million at December 31, 2024 and 2023, respectively.
 The Company, through its wholly owned subsidiary, GeoPlatanares, signed a BOT contract for the Platanares geothermal project in Honduras with ELCOSA, a privately owned Honduran energy company, for 15 years from the commercial operation date. Platanares sells the electricity produced by the power plants to ENEE, the national utility
of Honduras under a 30-year PPA which expires in 2047. The net book value of the assets related to the power plant was $74.9 million and $81.9 million at December 31, 2024 and 2023, respectively.
 The Company, through its subsidiary, Guadeloupe Bouillante ("GB"), owns a power plant in Guadeloupe. The net book value of the assets related to the power plant was $112.4 million and $101.7 million at December 31, 2024 and 2023, respectively. GB sells the electricity produced by the power plants to EDF, the French electric utility, under a 15-year PPA ending in 2030.
 Construction-in-Process
 Construction-in-process consists of the following:
December 31,
20242023
(Dollars in thousands)
Projects under exploration and development:
Up-front bonus costs $5,331 $5,335 
Exploration and development costs 187,669 156,438 
Interest capitalized 703 703 
Total projects under exploration and development
193,703 162,476 
Projects under construction:
Up-front bonus costs 11,031 11,156 
Drilling and construction costs 529,773 618,416 
Interest capitalized 21,082 22,919 
Total projects under construction
561,886 652,491 
Total projects under exploration and development and construction
$755,589 $814,967 
 
Projects under exploration and development
Up-front Bonus
Costs		Exploration and
Development Costs		Interest
Capitalized		Total
(Dollars in thousands)
Balance at December 31, 2021$5,335 $44,664 $703 $50,702 
Cost incurred during the year
— 44,566 — 44,566 
Balance at December 31, 20225,335 89,230 703 95,268 
Cost incurred during the year
— 70,667 — 70,667 
Write-off of unsuccessful exploration costs
— (3,459)— (3,459)
Balance at December 31, 20235,335 156,438 703 162,476 
Cost incurred during the year
— 36,339 — 36,339 
Write off of unsuccessful exploration costs
(4)(1,967)— (1,971)
Transfer of projects under exploration and development to projects under construction
— (3,141)— (3,141)
Balance at December 31, 2024$5,331 $187,669 $703 $193,703 
 
Projects under construction
Up-front Bonus
Costs		Drilling and
Construction
Costs		Interest
Capitalized		Total
(Dollars in thousands)

Balance at December 31, 2021$39,156 $611,553 $20,072 $670,781 
Cost incurred during the year
— 489,953 5,573 495,526 
Transfer of completed projects to property, plant and equipment (28,000)(340,377)— (368,377)
Balance at December 31, 202211,156 761,129 25,645 797,930 
Cost incurred during the year — 473,422 15,181 488,603 
Cost write-off
— (993)— (993)
Transfer of completed projects to property, plant and equipment
— (615,142)(17,907)(633,049)
Balance at December 31, 202311,156 618,416 22,919 652,491 
Cost incurred during the year
— 367,674 12,212 379,886 
Cost write off
— (1,958)— (1,958)
Transfer of projects under exploration and development to projects under construction— 3,141 — 3,141 
Transfer of completed projects to property, plant and equipment
(125)(457,500)(14,049)(471,674)
Balance at December 31, 2024$11,031 $529,773 $21,082 $561,886 
 Impairment of Long-lived Assets
The Brawley power plant has been generating electricity below its generating capacity of 13MW due to continuous wellfield issues which have resulted in higher-than-expected operating costs and lower-than-expected electricity revenues. The Company implemented a number of remediation plans and technical solutions involving additional investments in the power plant in order to improve its performance and reduce operating costs, however, during the fourth quarter of 2022, as a result of the failure of the recent remediation plan and the lower than forecasted performance of the power plant during that quarter, the Company decided that it was no longer economical to continue investing in the Brawley power plant as the probability of success of additional wellfield work to increase capacity and reduce operating costs is low. The Company concluded that the power plant can be operated at optimal capacity of 7MW or lower which will require lower investment and results in lower operating costs.
Based on the above circumstances and indicators, the Brawley power plant was tested for recoverability during the fourth quarter of 2022 by comparing the carrying amount of its assets to the estimated future net undiscounted cash flows expected to be generated by such assets, the result of which was that the carrying amount of the asset was above the estimated future net undiscounted cash flows. The Company then estimated the fair value of those assets using the expected future discounted cash flow approach using Level 3 inputs under ASC 820, as a measure of fair value as it deemed it to be the most appropriate for the power plant. As a result of the impairment analysis, the Brawley power plant was written down to its fair value of $13.6 million and the Company recorded a non-cash impairment loss of $30.5 million which was presented in the consolidated statement of operations and comprehensive income (loss) under “Impairment of long-lived-assets” for the year ended December 31, 2022. This write-down is allocated to the Electricity segment.
In estimating the fair value for the power plant, the Company utilized the discounted cash flow approach ("DCF") which is a form of the Income Approach. The DCF approach is based on the present value of the estimated cash flow expected to be generated by the Brawley power plant which is the asset group. The expected cash flow was discounted using a rate of return that reflects the relative risk of the asset, as well as the time value of money. The determination of the Company and asset specific risk-adjusted discount rate is based on the weighted-average cost of capital ("WACC") taking into consideration the value of equity and interest-bearing debt. The Company applied a WACC rate of 9% in the estimation of the Brawley power plant. The Company noted that a 1% change to the WACC or long-term growth rates would not yield a significant change in the estimated fair value of the Brawley power plant. In addition to the WACC rate of 9%, other significant inputs of the future net cash flow estimates were generation capacity output, average realized price, and operating costs growth rate. These future net cash flow estimates are classified as Level 3 within the fair value hierarchy. Below are the significant unobservable inputs included in the valuation as of the year ended December 31, 2022.
Significant Unobservable Inputs:
Average generation capacity (MW)7
Electricity price escalation (%)2.2 %
Cost long-term growth rate 2.2 %
Average realized electricity price ($/MW)92.2