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Property, plant and equipment - Interest and AFUDC Capitalized (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022
Schedule of Capitalization [Line Items] |  |
Total | $ 18,051 | $ 12,703
Allowance for borrowed funds |  |
Schedule of Capitalization [Line Items] |  |
AFUDC capitalized on regulated property: | 8,305 | 6,040
Allowance for equity funds |  |
Schedule of Capitalization [Line Items] |  |
AFUDC capitalized on regulated property: | 3,372 | 1,901
Interest capitalized on non-regulated property |  |
Schedule of Capitalization [Line Items] |  |
Interest capitalized on non-regulated property | $ 6,374 | $ 4,762

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