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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

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- Definition Carrying amount as of the balance sheet date of capitalized costs of regulated entities that are expected to be recovered through revenue sources within one year or the normal operating cycle, if longer. Such costs are capitalized if they meet both of the following criteria: a. It is probable that future revenue in an amount at least equal to the capitalized cost will result from inclusion of that cost in allowable costs for rate-making purposes. b. Based on available evidence, the future revenue will be provided to permit recovery of the previously incurred cost rather than to provide for expected levels of similar future costs. If the revenue will be provided through an automatic rate-adjustment clause, this criterion requires that the regulator's intent clearly be to permit recovery of the previously incurred cost. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 980 -SubTopic 340 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478742/980-340-50-1 + Details
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