RATE MATTERS - SWEPCo Rate Matters (Details) - SWEPCo - USD ($) $ in Millions |
1 Months Ended | 12 Months Ended | ||
|---|---|---|---|---|
Mar. 31, 2025 |
Jan. 31, 2022 |
Oct. 31, 2020 |
Dec. 31, 2021 |
|
| 2020 Texas Base Rate Case | ||||
| Public Utilities, General Disclosures [Line Items] | ||||
| Requested annual increase | $ 105 | |||
| Requested return on equity | 10.35% | |||
| Requested net annual increase | $ 90 | |||
| Revised requested annual increase | 100 | |||
| Revised requested net annual increase | $ 85 | |||
| Approved annual revenue increase | $ 39 | |||
| Approved return on equity | 9.25% | |||
| Amount of approved increase related to vegetation management | $ 5 | |||
| Amount of approved increase related to storm catastrophe reserve | $ 2 | |||
| Impairment charge total | $ 12 | |||
| 2025 Arkansas Base Rate Case | ||||
| Public Utilities, General Disclosures [Line Items] | ||||
| Requested annual increase | $ 114 | |||
| Requested return on equity | 10.90% | |||
| Requested debt capital structure | 52.30% | |||
| Requested equity capital structure | 47.70% | |||