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Electric utility segment - Consolidated Variable Interest Entities (Details) - USD ($)
$ in Thousands
Sep. 30, 2024
Dec. 31, 2023
Variable Interest Entity [Line Items]    
Accounts receivable and unbilled revenues, net $ 526,717 $ 575,176
Variable Interest Entity, Primary Beneficiary    
Variable Interest Entity [Line Items]    
Accounts receivable and unbilled revenues, net $ 325,100