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Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Earnings Per Share [Abstract]        
Net Earnings Attributable to PNMR $ 15,361 $ 53,709 $ 31,352 $ 71,288
Average Number of Common Shares:        
Outstanding during period (in shares) 85,835 85,835 85,835 85,835
Vested awards of restricted stock (in shares) 351 231 303 227
Average Shares – Basic (in shares) 86,186 86,066 86,138 86,062
Dilutive Effect of Common Stock Equivalents:        
Restricted stock (in shares) 40 41 60 40
Average Shares – Diluted (in shares) 86,226 86,107 86,198 86,102
Net Earnings Per Share of Common Stock:        
Basic (in dollars per share) $ 0.18 $ 0.62 $ 0.36 $ 0.83
Diluted (in dollars per share) $ 0.18 $ 0.62 $ 0.36 $ 0.83