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Regulatory matters - Regulatory Assets and Liabilities (Details) - USD ($)
$ in Thousands
Jun. 30, 2024
Dec. 31, 2023
Regulatory Liabilities [Line Items]    
Total regulatory assets $ 1,310,461 $ 1,327,683
Less: current regulatory assets (185,938) (142,970)
Non-current regulatory assets 1,124,523 1,184,713
Total regulatory liabilities 651,164 734,296
Less: current regulatory liabilities (88,449) (99,850)
Non-current regulatory liabilities 562,715 634,446
Income taxes    
Regulatory Liabilities [Line Items]    
Total regulatory liabilities 273,064 290,121
Cost of removal    
Regulatory Liabilities [Line Items]    
Total regulatory liabilities 188,840 185,786
Pension and post-employment benefits    
Regulatory Liabilities [Line Items]    
Total regulatory liabilities 111,556 104,636
Fuel and commodity cost adjustments    
Regulatory Liabilities [Line Items]    
Total regulatory liabilities 42,491 42,850
Clean energy and other customer programs    
Regulatory Liabilities [Line Items]    
Total regulatory liabilities 9,746 12,730
Rate adjustment mechanism    
Regulatory Liabilities [Line Items]    
Total regulatory liabilities 1,119 2,078
Other    
Regulatory Liabilities [Line Items]    
Total regulatory liabilities 24,348 96,095
Securitized costs, net    
Regulatory Liabilities [Line Items]    
Total regulatory assets 296,918 0
Rate adjustment mechanism    
Regulatory Liabilities [Line Items]    
Total regulatory assets 201,051 192,880
Deferred capitalized costs    
Regulatory Liabilities [Line Items]    
Total regulatory assets 147,536 124,517
Fuel and commodity cost adjustments    
Regulatory Liabilities [Line Items]    
Total regulatory assets 101,805 326,418
Income taxes    
Regulatory Liabilities [Line Items]    
Total regulatory assets 99,847 101,939
Wildfire mitigation and vegetation management    
Regulatory Liabilities [Line Items]    
Total regulatory assets 130,564 64,146
Pension and post-employment benefits    
Regulatory Liabilities [Line Items]    
Total regulatory assets 62,736 68,822
Environmental remediation    
Regulatory Liabilities [Line Items]    
Total regulatory assets 60,365 66,779
Clean energy and other customer programs    
Regulatory Liabilities [Line Items]    
Total regulatory assets 31,676 37,214
Debt premium    
Regulatory Liabilities [Line Items]    
Total regulatory assets 15,880 18,995
Retired generating plant    
Regulatory Liabilities [Line Items]    
Total regulatory assets 14,509 183,732
Asset retirement obligation    
Regulatory Liabilities [Line Items]    
Total regulatory assets 13,916 26,620
Cost of removal    
Regulatory Liabilities [Line Items]    
Total regulatory assets 11,084 11,084
Rate review costs    
Regulatory Liabilities [Line Items]    
Total regulatory assets 9,014 8,815
Long-term maintenance contract    
Regulatory Liabilities [Line Items]    
Total regulatory assets 3,948 4,932
Other    
Regulatory Liabilities [Line Items]    
Total regulatory assets $ 109,612 $ 90,790