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Condensed Consolidated Statements of Stockholders' Equity (Unaudited) - SPC - USD ($)
$ in Millions
Total
Paid-In Capital
Retained Earnings
Accumulated Other Comprehensive Income (Loss)
Noncontrolling Interests
SOUTHERN POWER CO
SOUTHERN POWER CO
Total Common Stockholder's Equity
SOUTHERN POWER CO
Paid-In Capital
SOUTHERN POWER CO
Retained Earnings
SOUTHERN POWER CO
Accumulated Other Comprehensive Income (Loss)
SOUTHERN POWER CO
Noncontrolling Interests
Beginning balance at Dec. 31, 2024 $ 36,674 $ 14,149 $ 13,750 $ (78) $ 3,466 $ 6,682 $ 3,216 $ 1,306 $ 1,912 $ (2) $ 3,466
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Net income (loss) 1,270   1,334   (64) 23 87   87   (64)
Capital contributions from parent company           130 130 130      
Other comprehensive income 3     3   2 2     2  
Cash dividends on common stock (791)   (791)     (70) (70)   (70)    
Capital contributions from noncontrolling interests 19       19 19         19
Distributions to noncontrolling interests (37)       (37) (37)         (37)
Other (5) (1) (2)                
Ending balance at Mar. 31, 2025 37,223 14,231 14,291 (75) 3,384 6,749 3,365 1,436 1,929 0 3,384
Beginning balance at Dec. 31, 2025 38,867 15,740 14,856 (75) 2,851 6,521 3,670 1,912 1,758 0 2,851
Increase (Decrease) in Stockholders' Equity [Roll Forward]                      
Net income (loss) 1,338   1,356   (18) (14) 4   4   (18)
Other comprehensive income 2     2   2 2     2  
Cash dividends on common stock (830)   (830)     (72) (72)   (72)    
Capital contributions from noncontrolling interests 4       4 4         4
Distributions to noncontrolling interests (46)       (46) (46)         (46)
Other (3) (1)     (1) (1)   (1) 1   (1)
Ending balance at Mar. 31, 2026 $ 39,912 $ 16,285 $ 15,382 $ (73) $ 2,790 $ 6,394 $ 3,604 $ 1,911 $ 1,691 $ 2 $ 2,790