v3.26.1
MGE Energy Inc Consolidated Statements of Common Equity (Unaudited) - USD ($)
$ in Thousands
Total
Common Stock [Member]
Additional Paid-in Capital [Member]
Retained Earnings [Member]
AOCI Attributable to Parent [Member]
Beginning balance, value at Dec. 31, 2024 $ 1,230,138 $ 36,490 $ 429,515 $ 764,133 $ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net Income (Loss) 68,090     68,090  
Common stock dividends declared $ (32,872)     (32,872)  
Stock Issued During Period, Shares, New Issues 0        
Stock Issued During Period, Shares, Dividend Reinvestment Plan 40,995        
Issuance of common stock, net $ 3,750 41 3,709    
Equity-based compensation plans and other 867 11 856    
Ending balance, value at Jun. 30, 2025 1,269,973 36,542 434,080 799,351 0
Beginning balance, value at Mar. 31, 2025 1,258,913 36,537 433,079 789,297 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net Income (Loss) 26,498     26,498  
Common stock dividends declared $ (16,444)     (16,444)  
Stock Issued During Period, Shares, New Issues 0        
Stock Issued During Period, Shares, Dividend Reinvestment Plan 5,221        
Issuance of common stock, net $ 471 5 466    
Equity-based compensation plans and other 535   535    
Ending balance, value at Jun. 30, 2025 1,269,973 36,542 434,080 799,351 0
Beginning balance, value at Dec. 31, 2025 1,303,936 36,542 434,959 832,435 0
Ending balance, value at Mar. 31, 2026 1,349,399 36,753 449,098 863,548 0
Beginning balance, value at Dec. 31, 2025 1,303,936 36,542 434,959 832,435 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net Income (Loss) 81,834     81,834  
Common stock dividends declared $ (35,299)     (35,299)  
Stock Issued During Period, Shares, New Issues 990,099        
Stock Issued During Period, Shares, Dividend Reinvestment Plan 72,432        
Issuance of common stock, net $ 88,948 1,217 87,731    
Equity-based compensation plans and other 1,100 22 1,078    
Ending balance, value at Jun. 30, 2026 1,440,519 37,781 523,768 878,970 0
Beginning balance, value at Mar. 31, 2026 1,349,399 36,753 449,098 863,548 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Net Income (Loss) 33,353     33,353  
Common stock dividends declared $ (17,931)     (17,931)  
Stock Issued During Period, Shares, New Issues 990,099        
Stock Issued During Period, Shares, Dividend Reinvestment Plan 37,444        
Issuance of common stock, net $ 74,934 1,028 73,906    
Equity-based compensation plans and other 764   764    
Ending balance, value at Jun. 30, 2026 $ 1,440,519 $ 37,781 $ 523,768 $ 878,970 $ 0