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Equity Method Investment - Summarized Financial Information (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Results of Operations      
Operating revenues $ 436,877 $ 544,077  
Financial Position      
Net property, plant, and equipment 693,502   $ 589,834
Assets 10,257,653 9,353,136 10,252,605
Total PNM common stockholder’s equity 2,355,731   2,349,093
NMRD      
Results of Operations      
Operating revenues 3,204 2,531  
Operating expenses 3,378 2,434  
Net Earnings Attributable to PNM (174) $ 97  
Financial Position      
Current assets 0   2,589
Net property, plant, and equipment 0   235,791
Non-current assets 0   1,849
Assets 0   240,229
Current liabilities 0   730
Non-current liabilities 0   358
Total PNM common stockholder’s equity $ 0   $ 239,141