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Electric utility segment - Consolidated Variable Interest Entities (Details) - USD ($) $ in Thousands | Sep. 30, 2025 | Dec. 31, 2024
--- | --- | ---
Variable Interest Entity [Line Items] |  |
Accounts receivable and unbilled revenues, net | $ 498,229 | $ 457,171
Variable Interest Entity, Primary Beneficiary |  |
Variable Interest Entity [Line Items] |  |
Accounts receivable and unbilled revenues, net | $ 322,400 |

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