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Regulatory matters - Regulatory Assets and Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Regulatory Liabilities [Line Items]
Total regulatory assets	$ 1,327,683	$ 1,271,501
Less: current regulatory assets	(142,970)	(190,393)
Non-current regulatory assets	1,184,713	1,081,108
Total regulatory liabilities	734,296	628,182
Less: current regulatory liabilities	(99,850)	(69,865)
Non-current regulatory liabilities	634,446	558,317
Income taxes
Regulatory Liabilities [Line Items]
Total regulatory liabilities	290,121	312,671
Cost of removal
Regulatory Liabilities [Line Items]
Total regulatory liabilities	185,786	191,173
Pension and post-employment benefits
Regulatory Liabilities [Line Items]
Total regulatory liabilities	104,636	68,085
Fuel and commodity cost adjustments
Regulatory Liabilities [Line Items]
Total regulatory liabilities	42,850	24,991
Clean energy and other customer programs
Regulatory Liabilities [Line Items]
Total regulatory liabilities	12,730	11,572
Rate adjustment mechanism
Regulatory Liabilities [Line Items]
Total regulatory liabilities	2,078	343
Other
Regulatory Liabilities [Line Items]
Total regulatory liabilities	96,095	19,347
Fuel and commodity cost adjustments
Regulatory Liabilities [Line Items]
Total regulatory assets	326,418	388,294
Retired generating plant
Regulatory Liabilities [Line Items]
Total regulatory assets	183,732	174,609
Rate adjustment mechanism
Regulatory Liabilities [Line Items]
Total regulatory assets	192,880	136,198
Income taxes
Regulatory Liabilities [Line Items]
Total regulatory assets	101,939	97,414
Deferred capitalized costs
Regulatory Liabilities [Line Items]
Total regulatory assets	124,517	90,121
Pension and post-employment benefits
Regulatory Liabilities [Line Items]
Total regulatory assets	68,822	80,736
Environmental costs
Regulatory Liabilities [Line Items]
Total regulatory assets	66,779	70,529
Wildfire mitigation and vegetation management
Regulatory Liabilities [Line Items]
Total regulatory assets	64,146	66,156
Clean energy and other customer programs
Regulatory Liabilities [Line Items]
Total regulatory assets	37,214	28,145
Asset retirement obligation
Regulatory Liabilities [Line Items]
Total regulatory assets	26,620	27,172
Debt premium
Regulatory Liabilities [Line Items]
Total regulatory assets	18,995	24,888
Cost of removal
Regulatory Liabilities [Line Items]
Total regulatory assets	11,084	11,084
Rate review costs
Regulatory Liabilities [Line Items]
Total regulatory assets	8,815	9,481
Long-term maintenance contract
Regulatory Liabilities [Line Items]
Total regulatory assets	4,932	6,504
Other
Regulatory Liabilities [Line Items]
Total regulatory assets	$ 90,790	$ 60,170

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- Definition

The amount for the individual regulatory asset as itemized in a table of regulatory assets as of the end of the period.

+ References

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-Topic 980
-SubTopic 340
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-Section 50
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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.

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