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Equity Method Investment - Summarized Financial Information (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Dec. 31, 2022
Results of Operations      
Operating revenues $ 544,077 $ 444,118  
Financial Position      
Net property, plant, and equipment 491,565   $ 372,988
Assets 9,353,136 8,727,686 9,257,377
Total PNM common stockholder’s equity 2,212,191   2,191,932
NMRD      
Results of Operations      
Operating revenues 2,530 2,796  
Operating expenses 2,419 2,404  
Net Earnings Attributable to PNM 111 $ 392  
Financial Position      
Current assets 15,631   8,357
Net property, plant, and equipment 180,353   169,440
Non-current assets 9,784   9,631
Assets 205,768   187,428
Current liabilities 1,048   5,822
Non-current liabilities 369   366
Total PNM common stockholder’s equity $ 204,351   $ 181,240