RATE MATTERS - Net Book Value (Details) - Generating Units Probable of Abandonment - SOUTHWESTERN ELECTRIC POWER COMPANY $ in Millions |
9 Months Ended |
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Sep. 30, 2026
USD ($)
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| Northeastern Plant, Unit 3 | |
| Public Utilities, General Disclosures [Line Items] | |
| Net Book Value | $ 50 |
| Accelerated Depreciation Regulatory Asset | 259 |
| Cost of Removal Regulatory Liability | 22 |
| Annual Depreciation | 8 |
| Welsh Plant, Units 1 and 3 | |
| Public Utilities, General Disclosures [Line Items] | |
| Net Book Value | 220 |
| Accelerated Depreciation Regulatory Asset | 264 |
| Cost of Removal Regulatory Liability | 56 |
| Annual Depreciation | $ 43 |
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- Definition The amount of accelerated depreciation as a regulatory asset for plants to be retired. No definition available.
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- Definition The regulatory liability recorded for cost of removal. No definition available.
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- Definition The amount of expense recognized in the current period that reflects the allocation of the cost of tangible assets over the assets' useful lives. Includes production and non-production related depreciation. Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. No definition available.
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- Definition Period end amount of total net PPE. No definition available.
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