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Acquisitions and Dispositions - Schedule of Wind Repowering Projects (Details) - SOUTHERN POWER CO
Sep. 30, 2025
MW
Kay Wind  
Business Combination [Line Items]  
Approximate nameplate capacity 200
Kay Wind | Maximum  
Business Combination [Line Items]  
Approximate nameplate capacity 299
Grant Plains  
Business Combination [Line Items]  
Approximate nameplate capacity 147
Grant Wind  
Business Combination [Line Items]  
Approximate nameplate capacity 152
Wake Wind  
Business Combination [Line Items]  
Approximate nameplate capacity 257