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Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Earnings Per Share [Abstract]    
Net Earnings Attributable to PNMR $ 55,014 $ 15,991
Average Number of Common Shares:    
Outstanding during period (in shares) 85,835 85,835
Vested awards of restricted stock (in shares) 266 256
Average Shares – Basic (in shares) 86,101 86,091
Dilutive Effect of Common Stock Equivalents:    
Restricted stock (in shares) 37 80
PNMR 2020 Forward Equity Sale Agreements (in shares) 3 0
Average Shares – Diluted (in shares) 86,141 86,171
Net Earnings Per Share of Common Stock:    
Basic (in dollars per share) $ 0.64 $ 0.19
Diluted (in dollars per share) $ 0.64 $ 0.19