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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, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]        
Net Earnings Attributable to PNMR $ 48,049 $ 45,304 $ 95,239 $ 100,318
Average Number of Common Shares:        
Outstanding during period (in shares) 90,200 85,835 90,200 85,835
Vested awards of restricted stock (in shares) 304 250 293 258
Average Shares – Basic (in shares) 90,504 86,085 90,493 86,093
Dilutive Effect of Common Stock Equivalents:        
Restricted stock (in shares) 48 39 40 38
Average Shares – Diluted (in shares) 90,552 86,129 90,533 86,133
Net Earnings Per Share of Common Stock:        
Basic (in dollars per share) $ 0.53 $ 0.53 $ 1.05 $ 1.17
Diluted (in dollars per share) $ 0.53 $ 0.53 $ 1.05 $ 1.16
2023 Forward Sale Agreements        
Dilutive Effect of Common Stock Equivalents:        
2023 Forward Sale Agreements (in shares) 0 5 0 2