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Regulatory Matters - Schedule of Changes in The Deferred Fuel and Purchased Power Regulatory Asset (Details) - USD ($) $ in Thousands | 6 Months Ended
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Jun. 30, 2026 | Jun. 30, 2025
Change in regulatory asset |  |
Deferred fuel and purchased power costs | $ 69,325 | $ 95,850
Amounts charged to customers | (279,830) | (201,035)
APS |  |
Change in regulatory asset |  |
Deferred fuel and purchased power costs | 69,325 | 95,850
Amounts charged to customers | (279,830) | (201,035)
Power Supply Adjustor (PSA) | ACC | APS |  |
Change in regulatory asset |  |
Balance at beginning of period | 149,068 | 287,597
Deferred fuel and purchased power costs | 69,325 | 95,850
Amounts charged to customers | (279,830) | (201,035)
Balance at end of period | $ (61,437) | $ 182,412

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- Definition The amortization of deferred fuel and purchased power costs. + References No definition available. + Details
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- Definition The increase (decrease) during the reporting period in unrecovered fuel costs for a regulated utility company. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section 45 -Paragraph 28 -Subparagraph (a) -SubTopic 10 -Topic 230 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482740/230-10-45-28 + Details
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