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Equity Method Investment - Summarized Financial Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2022
Jun. 30, 2021
Jun. 30, 2022
Jun. 30, 2021
Dec. 31, 2021
Results of Operations          
Operating revenues $ 499,730 $ 426,540 $ 943,848 $ 791,247  
Financial Position          
Net property, plant, and equipment 390,733   390,733   $ 248,856
Assets 8,911,105 8,120,469 8,911,105 8,120,469 8,666,885
Total PNM common stockholder’s equity 2,131,522   2,131,522   2,167,524
NMRD          
Results of Operations          
Operating revenues 4,021 3,885 6,817 6,635  
Operating expenses 2,387 2,416 4,791 4,938  
Net Earnings (Loss) Attributable to PNM 1,634 $ 1,469 2,026 $ 1,697  
Financial Position          
Current assets 9,065   9,065   10,729
Net property, plant, and equipment 163,006   163,006   166,495
Non-current assets 9,676   9,676   2,289
Assets 181,747   181,747   179,513
Current liabilities 1,045   1,045   824
Non-current liabilities 380   380   373
Total PNM common stockholder’s equity $ 180,322   $ 180,322   $ 178,316