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Equity Method Investment - Summarized Financial Information (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Results of Operations      
Operating revenues $ 444,118 $ 364,707  
Financial Position      
Net property, plant, and equipment 313,901   $ 248,856
Assets 8,727,686 7,943,309 8,666,885
Total PNM common stockholder’s equity 2,115,532   2,167,524
NMRD      
Results of Operations      
Operating revenues 2,796 2,750  
Operating expenses 2,404 2,522  
Net Earnings Attributable to PNM 392 $ 228  
Financial Position      
Current assets 5,827   10,729
Net property, plant, and equipment 164,733   166,495
Non-current assets 9,653   2,289
Assets 180,213   179,513
Current liabilities 1,148   824
Non-current liabilities 377   373
Total PNM common stockholder’s equity $ 178,688   $ 178,316