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Equity Method Investment - Summarized Financial Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Dec. 31, 2023
Results of Operations          
Electric Operating Revenues $ 569,256 $ 505,851 $ 1,494,235 $ 1,527,084  
Financial Position          
Current assets 495,694   495,694   $ 475,543
Total assets 10,843,481 10,050,841 10,843,481 10,050,841 10,252,605
Current liabilities 1,369,643   1,369,643   1,230,760
Total TXNM common stockholders’ equity 2,459,979   2,459,979   2,349,093
NMRD          
Results of Operations          
Electric Operating Revenues 0 4,020 3,204 10,525  
Operating expenses 0 1,743 3,378 6,127  
Net Earnings Attributable to PNM 0 $ 2,277 (174) $ 4,398  
Financial Position          
Current assets 0   0   2,589
Net utility plant 0   0   235,791
Non-current assets 0   0   1,849
Total assets 0   0   240,229
Current liabilities 0   0   730
Non-current liabilities 0   0   358
Total TXNM common stockholders’ equity $ 0   $ 0   $ 239,141