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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, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Earnings Per Share [Abstract]        
Net Earnings Attributable to PNMR $ 113,321 $ 121,768 $ 184,609 $ 163,997
Average Number of Common Shares:        
Outstanding during period (in shares) 85,835 79,654 85,835 79,654
Vested awards of restricted stock (in shares) 237 213 230 205
Average Shares – Basic (in shares) 86,072 79,867 86,065 79,859
Dilutive Effect of Common Stock Equivalents:        
PNMR 2020 Forward Equity Sale Agreements (in shares) 0 0 0 57
Restricted stock (in shares) 41 39 41 38
Average Shares – Diluted (in shares) 86,113 79,906 86,106 79,954
Net Earnings Per Share of Common Stock:        
Basic (in dollars per share) $ 1.32 $ 1.52 $ 2.14 $ 2.05
Diluted (in dollars per share) $ 1.32 $ 1.52 $ 2.14 $ 2.05