RATE MATTERS - Net Book Value (Details) - Generating Units Probable of Abandonment - SWEPCo $ in Millions	3 Months Ended
Mar. 31, 2025 USD ($)
Northeastern Plant, Unit 3
Public Utilities, General Disclosures [Line Items]
Net book value	$ 89.1
Accelerated Depreciation Regulatory Asset	196.9
Cost of Removal Regulatory Liability	21.0
Depreciation	16.6
Welsh Plant, Units 1 and 3
Public Utilities, General Disclosures [Line Items]
Net book value	303.8
Accelerated Depreciation Regulatory Asset	180.5
Cost of Removal Regulatory Liability	57.8
Depreciation	$ 44.9

The amount of accelerated depreciation as a regulatory asset for plants to be retired.

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- Definition

The regulatory liability recorded for cost of removal.

+ References

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.

+ References

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- Definition

Amount after accumulated depreciation, depletion and amortization of physical assets used in the normal conduct of business to produce goods and services and not intended for resale. Examples include, but are not limited to, land, buildings, machinery and equipment, office equipment, and furniture and fixtures.

+ References

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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.

+ References

No definition available.

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