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Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Earnings Per Share [Abstract]    
Net Earnings Attributable to PNMR $ 47,190 $ 55,014
Average Number of Common Shares:    
Outstanding during period (in shares) 90,200 85,835
Vested awards of restricted stock (in shares) 283 266
Average Shares – Basic (in shares) 90,483 86,101
Dilutive Effect of Common Stock Equivalents:    
Restricted stock (in shares) 31 37
PNMR 2020 Forward Equity Sale Agreements (in shares) 0 3
Average Shares – Diluted (in shares) 90,514 86,141
Net Earnings Per Share of Common Stock:    
Basic (in dollars per share) $ 0.52 $ 0.64
Diluted (in dollars per share) $ 0.52 $ 0.64