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Basis of presentation (Details)
$ in Thousands
3 Months Ended 6 Months Ended
Oct. 31, 2024
Jun. 30, 2025
USD ($)
Jun. 30, 2024
USD ($)
Jun. 30, 2025
USD ($)
Jun. 30, 2024
USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Selling, general and administrative expense   $ (112,887) $ (99,955) $ (223,934) $ (207,570)
Electric fuel and purchased power   $ 34,891 36,692 $ 78,639 76,415
Revision of Prior Period, Error Correction, Adjustment          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Selling, general and administrative expense     7,000   14,100
Electric fuel and purchased power     $ 7,000   $ 14,100
Discontinued Operations, Disposed of by Means Other than Sale, Spinoff | Everus          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Stock split, conversion ratio 0.25