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Equity Method Investment - Summarized Financial Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Results of Operations          
Operating revenues $ 477,156 $ 499,730 $ 1,021,233 $ 943,848  
Financial Position          
Net property, plant, and equipment 593,995   593,995   $ 372,988
Assets 9,626,970 8,911,105 9,626,970 8,911,105 9,257,377
Total PNM common stockholder’s equity 2,262,243   2,262,243   2,191,932
NMRD          
Results of Operations          
Operating revenues 3,975 4,021 6,505 6,817  
Operating expenses 1,965 2,387 4,384 4,791  
Net Earnings (Loss) Attributable to PNM 2,010 $ 1,634 2,121 $ 2,026  
Financial Position          
Current assets 4,468   4,468   8,357
Net property, plant, and equipment 200,071   200,071   169,440
Non-current assets 9,856   9,856   9,631
Assets 214,395   214,395   187,428
Current liabilities 1,162   1,162   5,822
Non-current liabilities 373   373   366
Total PNM common stockholder’s equity $ 212,860   $ 212,860   $ 181,240