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Condensed Consolidated Balance Sheets - PNMR (Parenthetical) - USD ($)
$ in Thousands
Mar. 31, 2023
Dec. 31, 2022
Statement of Financial Position [Abstract]    
Allowance for uncollectible accounts $ 4,884 $ 4,925
Accumulated depreciation, nuclear fuel $ 38,626 $ 43,985
Cumulative preferred stock of subsidiary, stated value (in dollars per share) $ 100 $ 100
Cumulative preferred stock of subsidiary, shares authorized (in shares) 10,000,000 10,000,000
Cumulative preferred stock of subsidiary, shares issued (in shares) 115,293 115,293
Cumulative preferred stock of subsidiary, shares outstanding (in shares) 115,293 115,293
Common stock, no par value (in dollars per share) $ 0 $ 0
Common stock, shares authorized (in shares) 120,000,000 120,000,000
Common stock, shares issued (in shares) 85,834,874 85,834,874
Common stock, shares outstanding (in shares) 85,834,874 85,834,874