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CONDENSED CONSOLIDATED BALANCE SHEETS - TEXAS-NEW MEXICO POWER COMPANY AND SUBSIDIARIES (Parenthetical) - $ / shares
Sep. 30, 2026
Dec. 31, 2025
Common stock, shares authorized (in shares) 200,000,000 200,000,000
Common stock, shares issued (in shares) 110,125,757 108,921,356
Common stock, shares outstanding (in shares) 110,125,757 108,921,356
Texas-New Mexico Power Company    
Common stock, par value (in dollars per share) $ 10 $ 10
Common stock, shares authorized (in shares) 12,000,000 12,000,000
Common stock, shares issued (in shares) 6,358 6,358
Common stock, shares outstanding (in shares) 6,358 6,358