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RATE MATTERS - February 2021 Severe Winter Weather Impacts in SPP (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2024 | Dec. 31, 2023 | Mar. 31, 2021
Public Utilities, General Disclosures [Line Items] |  |  |
Total Noncurrent Regulatory Assets | $ 5,129.2 | $ 5,092.4 |
SOUTHWESTERN ELECTRIC POWER COMPANY |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Total Noncurrent Regulatory Assets | 921.3 | 1,131.8 |
February 2021 Severe Storm Fuel Costs | SOUTHWESTERN ELECTRIC POWER COMPANY |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Total Noncurrent Regulatory Assets | 180.5 | 253.3 |
February 2021 Severe Storm Fuel Costs | Arkansas | SOUTHWESTERN ELECTRIC POWER COMPANY |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Total Noncurrent Regulatory Assets | $ 37.2 | 54.2 |
Remaining Recovery Period | 6 years |  |
February 2021 Severe Storm Fuel Costs | Louisiana | SOUTHWESTERN ELECTRIC POWER COMPANY |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Total Noncurrent Regulatory Assets | $ 70.6 | 97.2 |
Remaining Recovery Period |  |  | 5 years
February 2021 Severe Storm Fuel Costs | Texas | SOUTHWESTERN ELECTRIC POWER COMPANY |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Total Noncurrent Regulatory Assets | $ 72.7 | $ 101.9 |
Remaining Recovery Period | 5 years |  |
Approved Carrying Charge | 1.65% |  |

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