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BUSINESS AND SIGNIFICANT ACCOUNTING POLICIES (Tables)
 12 Months Ended
Dec. 31, 2025
Accounting Policies [Abstract]  
Schedule of Cash and Cash Equivalents
The following table provides a reconciliation of cash and cash equivalents and restricted cash and cash equivalents reported on the balance sheets that sum to the total of the same amounts shown on the statement of cash flows:
 
December 31,
202520242023
(Dollars in thousands)
Cash and cash equivalents $147,448 $94,395 $195,808 
Restricted cash and cash equivalents 133,418 111,37791,962
Total cash and cash equivalents and restricted cash and cash equivalents $280,866 $205,772 $287,770 
Schedule of Estimated Useful Lives The other assets are depreciated using the straight-line method over the following estimated useful lives of the assets:
 
Years
Buildings 25
Leasehold improvements 15-30
Machinery and equipment — manufacturing and drilling 5-10
Machinery and equipment — computers 3-5
Energy storage equipment 8-20
Solar facility equipment30
Office equipment — furniture and fixtures 5-15
Office equipment — other5-10
Vehicles 5-7
 Property, plant and equipment, net, consist of the following:
December 31,
20252024
(Dollars in thousands)
Land owned by the Company where the geothermal resource is located $56,070 $51,500 
Leasehold improvements 18,311 12,746 
Machinery and equipment 419,231 389,252 
Buildings and office equipment
157,534 145,272 
Vehicles21,078 20,159 
Energy storage equipment522,610 324,065 
Solar facility equipment95,036 97,502 
Geothermal and recovered energy generation power plants, including geothermal wells and exploration and resource development costs:
United States of America, net of cash grants 3,708,110 3,585,209 
Foreign countries 959,613 919,680 
Asset retirement cost 54,002 59,831 
Total cost of property, plant and equipment
6,011,595 5,605,216 
Less accumulated depreciation (2,339,026)(2,103,330)
Property, plant and equipment, net $3,672,569 $3,501,886 
Schedule of Contract Assets and Contract Liabilities Total contract assets and contract liabilities as of December 31, 2025 and 2024 are as follows:
December 31,
20252024
(Dollars in thousands)
Contract assets (*) $30,011 $29,243 
Contract liabilities (*) $(13,159)$(23,091)
(*) Contract assets and contract liabilities are presented as "Costs and estimated earnings in excess of billings on uncompleted contracts", and "Billings in excess of costs and estimated earnings on uncompleted contracts", respectively, on the consolidated balance sheets. The contract liabilities balance at the beginning of the year was substantially recognized as product revenues during the year ended December 31, 2025 as a result of performance obligations that were satisfied. Additionally, as of December 31, 2025 and 2024, long-term costs and estimated earnings in excess of billings on uncompleted contracts related to the Dominica project in the amount of $75.0 million and $26.0 million, respectively, are included under “Deposits and other” in the consolidated balance sheets, and not under the contract assets and contract liabilities above, due to their long-term nature. Further details related to the Dominica Project are provided below under the caption “The Dominica Project”.
The following table presents the significant changes in the contract assets and contract liabilities for the years ended December 31, 2025 and 2024:
Years Ended December 31,
20252024
Contract assetsContract liabilitiesContract assetsContract liabilities
(Dollars in thousands)
Recognition of contract liabilities as revenue as a result of performance obligations satisfied$— $21,478 $— $12,698 
Cash received in advance for which revenues have not yet recognized, net of expenditures made— (11,546)— (17,119)
Reduction of contract assets as a result of rights to consideration becoming unconditional(19,774)— (5,070)— 
Contract assets recognized, net of recognized receivables20,542 — 15,945 — 
Net change in contract assets and contract liabilities$768 $9,932 $10,875 $(4,421)
Schedule of Reconciles Revenues Accounted Under Lease Accounting
The following schedule reconciles revenues accounted under lease accounting, and revenues accounted under ASC 606, Revenues from Contracts with Customers, to total consolidated revenues for the three years ended December 31, 2025, 2024 and 2023:
Year Ended December 31,
202520242023
(Dollars in thousands)
Electricity and Energy Storage revenues accounted under lease accounting
$569,120 $553,348 $542,065 
Electricity, Product and Energy Storage revenues accounted under ASC 606 420,423326,306287,359
Total consolidated revenues $989,543 $879,654 $829,424 
Schedule of Changes in Allowance for Expected Credit Losses
The following table describes the changes in the allowance for expected credit losses for the years ended December 31, 2025 and 2024 (all related to trade receivables):
Years Ended December 31,
20252024
(Dollars in thousands)
Beginning balance of the allowance for expected credit losses$224 $90 
Change in the provision for expected credit losses for the period84 134 
Ending balance of the allowance for expected credit losses$308 $224 
Schedule of Computation of Basic and Diluted Earnings Per Share The table below shows the reconciliation of the number of shares used in the computation of basic and diluted earnings per share:
 
Year Ended December 31,
202520242023
(In thousands)
Weighted average number of shares used in computation of basic earnings per share
60,70560,45559,424
Add:
Additional shares from the assumed exercise of employee stock-based awards 427335338
Additional shares related to the effect of dilutive convertible senior notes
230——
Weighted average number of shares used in computation of diluted earnings per share
61,36260,79059,762
Schedule of Changes in Redeemable Noncontrolling Interest Changes in the carrying amount of the Company's Redeemable noncontrolling interest were as follows:
20252024
(Dollars in thousands)
Redeemable noncontrolling interest as of January 1, $9,448 $10,599 
Redeemable noncontrolling interest in results of operation of a consolidated subsidiary347 (319)
Cash paid to noncontrolling interest(956)— 
Currency translation adjustments1,563 (832)
Redeemable noncontrolling interest as of December 31, $10,402 $9,448