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Regulatory matters - Schedule of Regulatory Assets and Liabilities (Details) - USD ($)
$ in Thousands
Dec. 31, 2024
Dec. 31, 2023
Regulatory Liabilities [Line Items]    
Total regulatory assets $ 1,321,059 $ 1,327,683
Less: current regulatory assets (194,943) (142,970)
Non-current regulatory assets 1,126,116 1,184,713
Total regulatory liabilities 636,382 734,296
Less: current regulatory liabilities (76,744) (99,850)
Non-current regulatory liabilities 559,638 634,446
Income taxes    
Regulatory Liabilities [Line Items]    
Total regulatory liabilities 256,669 290,121
Cost of removal    
Regulatory Liabilities [Line Items]    
Total regulatory liabilities 188,924 185,786
Pension and post-employment benefits    
Regulatory Liabilities [Line Items]    
Total regulatory liabilities 138,765 104,636
Fuel and commodity cost adjustments    
Regulatory Liabilities [Line Items]    
Total regulatory liabilities 30,940 42,850
Clean energy and other customer programs    
Regulatory Liabilities [Line Items]    
Total regulatory liabilities 8,502 12,730
Rate adjustment mechanism    
Regulatory Liabilities [Line Items]    
Total regulatory liabilities 1,814 2,078
Other    
Regulatory Liabilities [Line Items]    
Total regulatory liabilities 10,768 96,095
Securitized costs, net    
Regulatory Liabilities [Line Items]    
Total regulatory assets 285,581 0
Rate adjustment mechanism    
Regulatory Liabilities [Line Items]    
Total regulatory assets 198,174 192,880
Deferred capitalized costs    
Regulatory Liabilities [Line Items]    
Total regulatory assets 178,412 124,517
Fuel and commodity cost adjustments    
Regulatory Liabilities [Line Items]    
Total regulatory assets 108,531 326,418
Wildfire mitigation and vegetation management    
Regulatory Liabilities [Line Items]    
Total regulatory assets 128,317 64,146
Income taxes    
Regulatory Liabilities [Line Items]    
Total regulatory assets 96,685 101,939
Pension and post-employment benefits    
Regulatory Liabilities [Line Items]    
Total regulatory assets 51,819 68,822
Environmental costs    
Regulatory Liabilities [Line Items]    
Total regulatory assets 62,340 66,779
Clean energy and other customer programs    
Regulatory Liabilities [Line Items]    
Total regulatory assets 40,492 37,214
Debt premium    
Regulatory Liabilities [Line Items]    
Total regulatory assets 12,764 18,995
Retired generating plant    
Regulatory Liabilities [Line Items]    
Total regulatory assets 14,586 183,732
Asset retirement obligation    
Regulatory Liabilities [Line Items]    
Total regulatory assets 11,671 26,620
Cost of removal    
Regulatory Liabilities [Line Items]    
Total regulatory assets 9,815 11,084
Rate review costs    
Regulatory Liabilities [Line Items]    
Total regulatory assets 11,153 8,815
Long-term maintenance contract    
Regulatory Liabilities [Line Items]    
Total regulatory assets 2,963 4,932
Other    
Regulatory Liabilities [Line Items]    
Total regulatory assets $ 107,756 $ 90,790