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Earnings Per Share (Details) - USD ($)
$ / shares in Units, shares in Thousands, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Earnings Per Share [Abstract]        
Net Earnings Attributable to PNMR $ 37,726 $ 122,433 $ 138,045 $ 153,785
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) 254 266 257 291
Average Shares – Basic (in shares) 86,089 86,101 86,092 86,126
Dilutive Effect of Common Stock Equivalents:        
Restricted stock (in shares) 32 35 36 52
PNMR 2020 Forward Equity Sale Agreements (in shares) 8 0 23 0
Average Shares – Diluted (in shares) 86,129 86,136 86,151 86,178
Net Earnings Per Share of Common Stock:        
Basic (in dollars per share) $ 0.44 $ 1.42 $ 1.60 $ 1.79
Diluted (in dollars per share) $ 0.44 $ 1.42 $ 1.60 $ 1.78