BUSINESS SEGMENTS
 The Company has three reporting segments: the Electricity segment, the Product segment and the Energy Storage segment. These segments are managed and reported separately as each offers different products and serves different markets. Under the Electricity segment, the Company builds, owns and operates geothermal, solar PV and recovered energy-based power plants in the United States, and geothermal power plants in foreign countries, and sells the electricity generated by those power plants. Under the Product segment, the Company designs, manufactures and sells equipment for geothermal and recovered energy-based electricity generation and provide services relating to the engineering, procurement and construction of geothermal and recovered energy-based power plants. Under the Energy Storage segment, the Company owns and operates grid connected In-Front-of-the-Meter battery energy storage systems, which provide capacity, energy and/or ancillary services directly to the electric grid.
The accounting policies of the segments are the same as those described under Note 1 to the condensed consolidated financial statements. Transfer prices between the segments were determined on current market values or cost plus markup of the seller’s segment. The Company’s Chief Operating Decision Maker (“CODM”) is comprised of its CEO and CFO. To evaluate segment performance and allocate the Company’s resources, the CODM uses segment measures of gross profit and operating income. The CODM reviews budget-to-actual variances of both profit measures on a monthly basis when making decisions about allocation of the Company’s resources to the segments. 
 Summarized financial information concerning the Company’s reportable segments is shown in the following tables, including the Company's disaggregated revenues from contracts with customers as required by ASC 606, Revenue from Contracts with Customers (“ASC 606”). Total consolidated revenues, gross profit (loss) and operating income (loss) of the Company’s business segments exclude intersegment revenues, gross profit (loss) and operating income (loss) as these activities are eliminated in consolidation and are not included in CODM’s evaluation of performance of each segment.
 
ElectricityProductEnergy Storage
Total
(Dollars in thousands)
Year Ended December 31, 2025:
Revenues from external customers:
United States (1)
$500,377 $10,954 $78,957 $590,288 
Foreign (2)
193,523 205,732 — 399,255 
Net revenues from external customers 693,900 216,686 78,957 989,543 
Less:
Depreciation and amortization expenses (3)
236,278 10,377 29,365 276,020 
Other cost of revenues expenses (4)
259,711 160,294 20,833 440,838 
Segment gross profit (loss)
197,911 46,015 28,759 272,685 
Less:
Segment operating expenses (5)
83,284 22,613 (2,436)103,460 
Segment operating income (loss) $114,627 $23,402 $31,195 $169,225 
Total depreciation and amortization expense (6)
250,787 11,751 29,586 292,124 
Segment assets at period end (7) (*)
5,338,343 276,205 631,960 6,246,508 
Expenditures for long-lived assets 446,843 13,132 159,801 619,776 
* Including unconsolidated investments 162,111 — — 162,111 
Year Ended December 31, 2024:
Revenues from external customers:
United States (1)
$510,645 $8,969 $37,729 $557,343 
Foreign (2)
191,619 130,692 — 322,311 
Net revenues from external customers 702,264 139,661 37,729 879,654 
Less:
Depreciation and amortization expenses (3)
218,252 10,363 20,262 248,876 
Other cost of revenues expenses (4)
241,274 103,548 13,336 358,159 
Segment gross profit (loss)242,738 25,750 4,131 272,619 
Less:
Segment operating expenses (5)
80,832 15,428 3,889 100,149 
Segment operating income (loss) $161,906 $10,322 $242 $172,470 
Total depreciation and amortization expense (6)
230,957 11,693 20,213 262,863 
Segment assets at period end (7) (*)
4,983,069 229,687 453,468 5,666,224 
Expenditures for long-lived assets 375,540 10,005 102,133 487,678 
* Including unconsolidated investments 144,585 — — 144,585 
Year Ended December 31, 2023:
Revenues from external customers:
United States (1)
$473,323 $7,610 $28,894 $509,827 
Foreign (2)
193,444 126,153 — 319,597 
Net revenues from external customers666,767 133,763 28,894 829,424 
Less:
Depreciation and amortization expenses (3)
189,194 5,358 14,621 209,173 
Other cost of revenues expenses (4)
233,355 110,444 12,434 356,233 
Segment gross profit (loss)244,218 17,961 1,839 264,018 
Less:
Segment operating expenses (5)
75,384 14,425 7,624 97,433 
Segment operating income (loss) $168,834 $3,536 $(5,785)$166,585 
Total depreciation and amortization expense (6)
199,344 10,908 14,545 224,797 
Segment assets at period end (7) (*)
4,652,392 199,897 355,990 5,208,279 
Expenditures for long-lived assets 474,592 20,599 123,192 618,383 
* Including unconsolidated investments125,439 — — 125,439 
(1)Electricity segment revenues in the United States are all accounted under lease accounting, except for $143.5 million, $153.2 million, and $124.7 million for the years 2025, 2024 and 2023, respectively, which are accounted under ASC 606. Product and Energy Storage segment revenues in the United States are accounted under ASC 606, as further described under Note 1 to the consolidated financial statements, except for Energy Storage revenues of $18.8 million, $4.2 million and none for the years ended December 31, 2025, 2024 and 2023, respectively, that are accounted under lease accounting.
(2)Electricity segment revenues in foreign countries are all accounted under lease accounting. Product revenues in foreign countries are accounted under ASC 606 as further described under Note 1 to the consolidated financial statements.
(3)Depreciation and amortization expense amounts align with the segment-level information that is regularly provided to the CODM, and do not include intersegment transactions. Depreciation and amortization expenses included in the segment measure of gross profit are related to the specific tangible and intangible assets associated with each of the reportable segment.
(4)Other cost of revenues expenses for each reportable segment include:
Electricity: primarily cost of manpower, utilities, repair and maintenance, royalties, and property taxes.
Products: primarily cost of raw materials and finished goods used in manufacturing, manpower, transportation, and third-party subcontractors.
Energy Storage: primarily cost of manpower, utilities, and insurance.
(5)Segment operating expenses include research and development expenses, selling and marketing expenses, and general and administrative expenses such as manpower, depreciation and amortization, legal and professional services. Such expenses do not include intersegment transactions. Segment operating expenses related to the Energy Storage segment are directly related to this segment. Segment operating expenses related to the Electricity and Product segments are allocated between these two segments based on their weighted contribution to revenues, except for certain specific expenses or gains that are specifically allocated to one of these segments, as applicable, such as impairment of long-lived assets, write-off of unsuccessful exploration activities, and other operating income.
(6)Total depreciation and amortization expenses for each segment are related to the specific tangible and intangible assets associated with the respective reportable segment.
(7)Electricity segment assets include goodwill in the amount of $163.6 million , $146.4 million and $85.9 million as of December 31, 2025, 2024 and 2023, respectively. Energy Storage segment assets include goodwill in the amount of $4.6 million , $4.6 million and $4.6 million as of December 31, 2025, 2024 and 2023, respectively. No goodwill is included in the Product segment assets as of December 31, 2025, 2024 and 2023.
Reconciling information between reportable segments and the Company’s consolidated totals is shown in the following table: 
Year Ended December 31,
202520242023
(Dollars in thousands)
Reconciliation of profit or loss (segment gross profit):
Total segment gross profit (loss)
$272,685 $272,619 $264,018 
Less operating expenses:
Research and development expenses
6,304 6,501 7,215 
Selling and marketing expenses
18,898 17,694 18,306 
General and administrative expenses
79,592 80,119 68,179 
Other operating income(14,844)(9,375)
Write-off of long-lived assets
12,064 1,280 — 
Write-off of unsuccessful exploration activities
1,446 3,930 3,733 
Operating income $169,225 $172,470 $166,585 
Interest income 6,015 7,883 11,983 
Interest expense, net (141,851)(134,031)(98,881)
Derivatives and foreign currency transaction gains (losses)5,248 (4,187)(3,278)
Income attributable to sale of tax benefits 66,726 73,054 61,157 
Other non-operating income (expense), net 385 188 1,519 
Total consolidated income before income taxes and equity in earnings (losses) of investees $105,748 $115,377 $139,085 
Reconciliation of profit or loss (segment operating income):
Total segment operating income
$169,225 $172,470 $166,585 
Interest income6,015 7,883 11,983 
Interest expense, net(141,851)(134,031)(98,881)
Derivatives and foreign currency transaction gains (losses)5,248 (4,187)(3,278)
Income attributable to sale of tax benefits66,726 73,054 61,157 
Other non-operating income (expense), net385 188 1,519 
Total consolidated income before income taxes and equity in earnings (losses) of investees$105,748 $115,377 $139,085 
 The Company sells electricity, products, and provides energy storage services mainly to the geographical areas set forth below based on the location of the customer. The following tables present certain data by geographic area: 
Year Ended December 31,
202520242023
(Dollars in thousands)
Revenues from external customers attributable to:
United States $590,288 $557,343 $509,827 
Indonesia 1,489 7,616 26,732 
Kenya 117,422 114,066 109,217 
Dominica
48,931 — — 
Turkey 5,147 3,013 2,469 
Guatemala 28,014 28,955 30,174 
New Zealand 128,817 78,665 66,526 
Honduras28,658 30,304 31,589 
Other foreign countries 40,777 59,692 52,889 
Consolidated total $989,543 $879,654 $829,424 
The following table presents information on geographic area of long-lived assets:
Year Ended December 31,
202520242023
(Dollars in thousands)
Long-lived assets (primarily power plants and related assets) located in:
United States $3,897,443 $3,464,011 $3,085,892 
Kenya 363,422 382,738 377,563 
Guadeloupe
158,627 112,375 101,728 
Other foreign countries 347,697 333,306 276,300 
Consolidated total $4,767,189 $4,292,430 $3,841,483 
 The following table presents revenues from major customers:
 
Year Ended December 31,
202520242023
Revenues%Revenues%Revenues%
(Dollars in
thousands)
(Dollars in
thousands)
(Dollars in
thousands)
Southern California Public Power (1)
$175,999 17.8 %$181,120 20.6 %$181,656 21.2 %
Sierra Pacific Power Company and Nevada Power Company (1)(2)
136,730 13.8 133,108 15.1 116,797 14.1 %
KPLC (1)
117,422 11.9 114,066 13.0 109,217 13.2 %
(1 )Revenues reported in Electricity segment.
(2) Subsidiaries of NV Energy, Inc.

Historical Timeline

Fiscal YearFiled
2025Feb 26, 2026Showing above
2024Feb 27, 2025
2023Feb 23, 2024
2022Feb 24, 2023
2021Feb 25, 2022
2020Feb 26, 2021
2019Mar 2, 2020
2018Mar 1, 2019
2017Mar 16, 2018
2016Mar 1, 2017
2015Feb 26, 2016

About Segments Disclosures

Segment disclosures break a company into its reportable operating units, revealing revenue, profit, and asset allocation that consolidated financial statements obscure. Under ASC 280, segments must match how the chief operating decision maker views the business, providing a window into internal management structure and resource allocation priorities.

Key signals: compare segment margins to identify which units drive profitability and which destroy value. Watch for changes in the number of reportable segments — segment aggregation or disaggregation often coincides with strategic shifts or attempts to obscure declining performance. Intersegment elimination patterns reveal internal pricing practices. The reconciliation between segment totals and consolidated figures exposes corporate overhead allocation and unallocated items. Geographic revenue concentration highlights regulatory and currency exposure. Compare segment-level capital expenditure against segment revenue to assess where management is investing for future growth versus harvesting existing assets.