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v3.25.3

RATE MATTERS - Regulated Generating Units (Details) - SWEPCo - USD ($) $ in Millions | 1 Months Ended |
--- | --- | ---
Oct. 29, 2025 | Aug. 31, 2025 | Sep. 30, 2025
Pirkey Plant |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Public utilities, remaining net book recovery period |  | 20 years |
Pirkey Plant | Subsequent Event |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Public utilities, remaining net book recovery period | 20 years |  |
Pirkey Generating Station (Unit No. 1) | Texas |  |  |
Public Utilities, General Disclosures [Line Items] |  |  |
Net Book Value |  |  | $ 117

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