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Condensed Consolidated Balance Sheets - TNMP (Parenthetical) - $ / shares	Mar. 31, 2025	Dec. 31, 2024
Common stock, shares authorized (in shares)	200,000,000
Common stock, shares issued (in shares)	92,659,335	92,659,335
Common stock, shares outstanding (in shares)	92,659,335	92,659,335
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

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