XML 72 R54.htm IDEA: XBRL DOCUMENT v3.22.2
Regulatory matters - Regulatory Assets and Liabilities (Detail) - USD ($)
$ in Thousands
Jun. 30, 2022
Dec. 31, 2021
Regulatory Liabilities [Line Items]    
Total regulatory assets $ 1,260,521 $ 1,167,625
Less: current regulatory assets (136,428) (158,212)
Non-current regulatory assets 1,124,093 1,009,413
Total regulatory liabilities 630,823 576,189
Less: current regulatory liabilities (72,956) (65,809)
Non-current regulatory liabilities 557,867 510,380
Income taxes    
Regulatory Liabilities [Line Items]    
Total regulatory liabilities 322,131 295,720
Cost of removal    
Regulatory Liabilities [Line Items]    
Total regulatory liabilities 192,900 191,981
Pension and post-employment benefits    
Regulatory Liabilities [Line Items]    
Total regulatory liabilities 59,670 34,468
Clean energy and other customer programs    
Regulatory Liabilities [Line Items]    
Total regulatory liabilities 16,204 14,829
Fuel and commodity costs adjustments    
Regulatory Liabilities [Line Items]    
Total regulatory liabilities 9,542 18,229
Rate adjustment mechanism    
Regulatory Liabilities [Line Items]    
Total regulatory liabilities 3,000 3,316
Rate base offset    
Regulatory Liabilities [Line Items]    
Total regulatory liabilities 3,954 4,998
Other    
Regulatory Liabilities [Line Items]    
Total regulatory liabilities 23,422 12,648
Fuel and commodity costs adjustments    
Regulatory Liabilities [Line Items]    
Total regulatory assets 348,115 339,900
Retired generating plant    
Regulatory Liabilities [Line Items]    
Total regulatory assets 176,622 185,073
Pension and post-employment benefits    
Regulatory Liabilities [Line Items]    
Total regulatory assets 137,759 134,141
Rate adjustment mechanism    
Regulatory Liabilities [Line Items]    
Total regulatory assets 126,710 117,309
Income taxes    
Regulatory Liabilities [Line Items]    
Total regulatory assets 98,148 79,472
Environmental remediation    
Regulatory Liabilities [Line Items]    
Total regulatory assets 73,652 81,802
Deferred capitalized costs    
Regulatory Liabilities [Line Items]    
Total regulatory assets 83,069 62,599
Wildfire mitigation and vegetation management    
Regulatory Liabilities [Line Items]    
Total regulatory assets 48,453 35,789
Debt premium    
Regulatory Liabilities [Line Items]    
Total regulatory assets 27,843 34,204
Asset retirement obligation    
Regulatory Liabilities [Line Items]    
Total regulatory assets 38,559 26,810
Clean energy and other customer programs    
Regulatory Liabilities [Line Items]    
Total regulatory assets 26,677 26,015
Rate review costs    
Regulatory Liabilities [Line Items]    
Total regulatory assets 8,664 9,167
Long-term maintenance contract    
Regulatory Liabilities [Line Items]    
Total regulatory assets 7,445 9,134
Other    
Regulatory Liabilities [Line Items]    
Total regulatory assets $ 58,805 $ 26,210