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Regulatory Matters - Regulatory Assets and Liabilities - Footnote (Details) $ in Thousands |  | 3 Months Ended | 12 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Aug. 01, 2023 USD ($) | Sep. 30, 2023 USD ($) | Dec. 31, 2024 USD ($) | Jan. 30, 2024 USD ($) | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($) | Mar. 01, 2020 MWac
Regulatory Liabilities [Line Items] |  |  |  |  |  |  |
Capital expenditure shortfall refundable to customers (percent) |  |  | 80.00% |  |  |  |
Retroactive rate adjustment collection period |  |  | 24 months |  |  |  |
Regulatory asset, amortization period |  |  | 26 years |  |  |  |
Regulatory assets |  |  | $ 1,321,059 |  | $ 1,327,683 |  |
Mountain View Fire |  |  |  |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |  |  |  |
Accrued estimated losses |  |  | 172,300 |  |  |  |
Expected recoveries of insurance amount |  |  | 116,000 |  |  |  |
Expenses of wildlife memerandum account |  |  | 56,300 |  |  |  |
Insurance settlements receivable |  |  | $ 136,500 |  |  |  |
Empire Electric System - Missouri |  |  |  |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |  |  |  |
Securitization of qualified extraordinary costs affirmed | $ 290,383 |  |  |  |  |  |
Deferred capitalized costs |  |  |  |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |  |  |  |
Regulatory asset, amortization period |  |  | 20 years |  |  |  |
Capitalized operating and maintenance costs, recovery rate, (percent) |  |  | 2.43% |  |  |  |
Regulatory assets |  |  | $ 178,412 |  | 124,517 |  |
Fuel and commodity cost adjustments |  |  |  |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |  |  |  |
Asset retirement obligation |  |  |  |  |  | $ 21,283 |
Regulatory assets |  |  | 108,531 |  | 326,418 |  |
Pension and post-employment benefits |  |  |  |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |  |  |  |
Regulatory assets |  |  | $ 51,819 |  | 68,822 |  |
Future service years of employees |  |  | 10 years |  |  |  |
Environmental costs |  |  |  |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |  |  |  |
Regulatory assets |  |  | $ 62,340 |  | 66,779 |  |
Environmental remediation, rate recovery period |  |  | 7 years |  |  |  |
Clean energy and other customer programs |  |  |  |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |  |  |  |
Regulatory assets |  |  | $ 40,492 |  | 37,214 |  |
Retired generating plant |  |  |  |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |  |  |  |
Regulatory assets |  |  | $ 14,586 |  | 183,732 |  |
Coal generation capacity (MW) | MWac |  |  |  |  |  |  | 200
Long-term maintenance contract |  |  |  |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |  |  |  |
Regulatory assets, recovery period |  |  | 5 years |  |  |  |
Regulatory assets |  |  | $ 2,963 |  | $ 4,932 |  |
Minimum | Fuel and commodity cost adjustments |  |  |  |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |  |  |  |
Regulatory asset, amortization period |  |  | 6 months |  |  |  |
Minimum | Pension and post-employment benefits |  |  |  |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |  |  |  |
Regulatory assets, recovery period |  |  | 3 years |  |  |  |
Minimum | Clean energy and other customer programs |  |  |  |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |  |  |  |
Regulatory assets, recovery period |  |  | 1 year |  |  |  |
Minimum | Rate review costs |  |  |  |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |  |  |  |
Costs capitalized and amortized period |  |  | 1 year |  |  |  |
Maximum | Fuel and commodity cost adjustments |  |  |  |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |  |  |  |
Regulatory asset, amortization period |  |  | 24 months |  |  |  |
Maximum | Pension and post-employment benefits |  |  |  |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |  |  |  |
Regulatory assets, recovery period |  |  | 8 years |  |  |  |
Maximum | Clean energy and other customer programs |  |  |  |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |  |  |  |
Regulatory assets, recovery period |  |  | 10 years |  |  |  |
Maximum | Rate review costs |  |  |  |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |  |  |  |
Costs capitalized and amortized period |  |  | 5 years |  |  |  |
Rate adjustment mechanism | Minimum |  |  |  |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |  |  |  |
Regulatory assets, recovery period |  |  | 1 year |  |  |  |
Rate adjustment mechanism | Maximum |  |  |  |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |  |  |  |
Regulatory assets, recovery period |  |  | 5 years |  |  |  |
Midwest Extreme Weather Event | Fuel and commodity cost adjustments |  |  |  |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |  |  |  |
Issuance of securitized tariff bonds, authorized amount |  |  |  |  |  | 221,646 |
Public utilities, incurred cost one-time net gain (loss) | $ 63,495 |  |  |  |  |  |
Public utilities, incurred cost one-time net gain (loss), net of tax |  | $ 48,452 |  |  |  |  |
Midwest Extreme Weather Event | Empire Electric |  |  |  |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |  |  |  |
Issuance of securitized bonds for qualified extraordinary costs |  |  |  | $ 301,463 |  |  |
Amortization expense |  |  | $ 15,939 |  |  |  |
Energy Transistion Costs | Fuel and commodity cost adjustments |  |  |  |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |  |  |  |
Issuance of securitized tariff bonds, authorized amount |  |  |  |  |  | $ 140,774 |
Securitized Utility Tariff Bonds due January 1, 2035 | Fuel and commodity cost adjustments |  |  |  |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |  |  |  |
Issuance of securitized tariff bonds, authorized amount |  |  |  | $ 180,500 |  |  |
Percentage of public utilities, issuance of securitized tariff bonds |  |  |  | 0.04943 |  |  |
Securitized Utility Tariff Bonds due January 1, 2039 | Fuel and commodity cost adjustments |  |  |  |  |  |  |
Regulatory Liabilities [Line Items] |  |  |  |  |  |  |
Issuance of securitized tariff bonds, authorized amount |  |  |  | $ 125,000 |  |  |
Percentage of public utilities, issuance of securitized tariff bonds |  |  |  | 0.05091 |  |  |

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