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Equity Method Investment - Summarized Financial Information (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Income Statement [Abstract]      
Operating Revenues $ 1,779,873 $ 1,523,012 $ 1,457,603
Balance Sheet Related Disclosures [Abstract]      
Net property, plant, and equipment 248,856 218,719  
Total assets 8,666,885 7,939,854 7,298,774
Total PNMR common stockholders’ equity 2,167,524 2,049,465  
NMRD      
Income Statement [Abstract]      
Operating Revenues 12,738 10,366 3,662
Operating expenses 9,733 7,476 2,971
Net earnings 3,005 2,890 $ 691
Balance Sheet Related Disclosures [Abstract]      
Current assets 10,729 8,046  
Net property, plant, and equipment 166,495 172,585  
Non-current assets 2,289 1,900  
Total assets 179,513 182,531  
Current liabilities 824 841  
Non-current liabilities 373 380  
Total PNMR common stockholders’ equity $ 178,316 $ 181,310