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Condensed Consolidated Balance Sheets - TNMP (Parenthetical) - $ / shares
Jun. 30, 2024
Dec. 31, 2023
Common stock, shares authorized (in shares) 120,000,000 120,000,000
Common stock, shares issued (in shares) 90,200,384 90,200,384
Common stock, shares outstanding (in shares) 90,200,384 90,200,384
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