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Equity Method Investment - Summarized Financial Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Sep. 30, 2022
Sep. 30, 2021
Dec. 31, 2021
Results of Operations          
Operating revenues $ 729,888 $ 554,551 $ 1,673,736 $ 1,345,798  
Financial Position          
Net property, plant, and equipment 485,023   485,023   $ 248,856
Assets 9,028,890 8,256,070 9,028,890 8,256,070 8,666,885
Total PNM common stockholder’s equity 2,201,881   2,201,881   2,167,524
NMRD          
Results of Operations          
Operating revenues 3,407 3,543 10,224 10,179  
Operating expenses 2,381 2,422 7,172 7,360  
Net Earnings Attributable to PNM 1,026 $ 1,121 3,052 $ 2,819  
Financial Position          
Current assets 6,750   6,750   10,729
Net property, plant, and equipment 166,229   166,229   166,495
Non-current assets 9,749   9,749   2,289
Assets 182,728   182,728   179,513
Current liabilities 1,017   1,017   824
Non-current liabilities 363   363   373
Total PNM common stockholder’s equity $ 181,348   $ 181,348   $ 178,316