GENERAL AND BASIS OF PRESENTATION - Principal customers, total revenues (Details) - Revenue Benchmark - Customer Concentration Risk	3 Months Ended
Mar. 31, 2025	Mar. 31, 2024
Southern California Public Power Authority (“SCPPA”)
Concentration Risk [Line Items]
Concentration risk (in percentage)	22.00%	24.70%
Sierra Pacific Power Company and Nevada Power Company
Concentration Risk [Line Items]
Concentration risk (in percentage)	16.10%	16.80%
Kenya Power and Lighting Co. Ltd. ("KPLC")
Concentration Risk [Line Items]
Concentration risk (in percentage)	12.10%	12.20%

For an entity that discloses a concentration risk in relation to quantitative amount, which serves as the "benchmark" (or denominator) in the equation, this concept represents the concentration percentage derived from the division.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 280
-SubTopic 10
-Name Accounting Standards Codification
-Section 50
-Paragraph 42
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482810/280-10-50-42

Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 21
-Subparagraph (a)
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482907/825-10-50-21

Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 825
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-Section 50
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Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 275
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Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef
-Name Accounting Standards Codification
-Topic 275
-SubTopic 10
-Section 50
-Paragraph 20
-Publisher FASB
-URI https://asc.fasb.org/1943274/2147482861/275-10-50-20

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