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EFFECTS OF REGULATION - Regulatory Asset, Early Retirement (Details) - Generating Units Probable of Abandonment $ in Millions | 12 Months Ended
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Dec. 31, 2024 USD ($)
Northeastern Plant, Unit 3 | PUBLIC SERVICE COMPANY OF OKLAHOMA |
Public Utilities, General Disclosures [Line Items] |
Net Book Value | $ 101.7
Accelerated Depreciation Regulatory Asset | 189.0
Cost of Removal Regulatory Liability | 21.0
Annual Depreciation | 16.2
Welsh Plant, Units 1 and 3 | SOUTHWESTERN ELECTRIC POWER COMPANY |
Public Utilities, General Disclosures [Line Items] |
Net Book Value | 324.3
Accelerated Depreciation Regulatory Asset | 168.6
Cost of Removal Regulatory Liability | 57.6
Annual Depreciation | $ 43.6

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- Definition The net amount of all regulatory assets less all regulatory liabilities as of the end of the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 980 -SubTopic 340 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org/1943274/2147478742/980-340-50-1 + Details
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