RATE MATTERS - PSO and SWEPCo Rate Matters (Details) - USD ($) $ in Millions |
1 Months Ended | 3 Months Ended | 9 Months Ended |
|---|---|---|---|
Apr. 30, 2022 |
Sep. 30, 2026 |
Sep. 30, 2026 |
|
| SPP OATT Upgrade Costs | PUBLIC SERVICE COMPANY OF OKLAHOMA | |||
| Public Utilities, General Disclosures [Line Items] | |||
| Net favorable impact amount | $ 12 | ||
| North Central Wind Energy Facilities | |||
| Public Utilities, General Disclosures [Line Items] | |||
| Net capacity factor guarantee, measurement period started | 5 years | ||
| Net capacity factor guarantee, full period under coverage | 30 years | ||
| Net capacity factor guarantee, measurement period, first start period | 5 years |