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Condensed Consolidated Balance Sheets - PNMR (Parenthetical) - USD ($) $ in Thousands | Mar. 31, 2022 | Dec. 31, 2021
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Statement of Financial Position [Abstract] |  |
Allowance for uncollectible accounts | $ 6,392 | $ 7,265
Accumulated depreciation, nuclear fuel | $ 47,131 | $ 41,181
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

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