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Segment Information - Summarized Financial Information (Details)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2023
USD ($)
Sep. 30, 2022
USD ($)
Sep. 30, 2023
USD ($)
segment
Sep. 30, 2022
USD ($)
Dec. 31, 2022
USD ($)
Apr. 01, 2020
USD ($)
Apr. 01, 2018
USD ($)
Segment Reporting Information, Profit (Loss) [Abstract]              
Electric operating revenues $ 505,851 $ 729,888 $ 1,527,084 $ 1,673,736      
Utility margin 177,178 269,221 545,516 593,647      
Other operating expenses 128,694 136,216 387,155 409,061      
Depreciation and amortization 80,192 76,570 237,405 229,103      
Operating income 86,652 182,763 278,073 337,223      
Interest income (expense) 5,366 3,969 15,568 11,588      
Other income (4,531) (12,019) 8,374 (76,788)      
Interest Charges (49,838) (34,526) (136,660) (89,963)      
Earnings before Income Taxes 37,649 140,187 165,355 182,060      
Income taxes (benefit) (5,267) 13,450 12,742 16,982      
Net Earnings 42,916 126,737 152,613 165,078      
Valencia non-controlling interest (5,058) (4,172) (14,172) (10,897)      
Subsidiary preferred stock dividends (132) (132) (396) (396)      
Net Earnings Available for PNM Common Stock 37,726 122,433 138,045 153,785      
Total Assets 10,050,841 9,028,890 10,050,841 9,028,890 $ 9,257,377    
Goodwill 278,297 278,297 $ 278,297 278,297 278,297    
PNM              
Segment Reporting Information [Line Items]              
Number of operating segments | segment     1        
Segment Reporting Information, Profit (Loss) [Abstract]              
Electric operating revenues 350,334 597,337 $ 1,118,741 1,312,800      
Depreciation and amortization 44,537 45,361 132,287 137,132      
Operating income 30,696 139,915 163,015 234,366      
Interest Charges (22,354) (15,467) (61,242) (44,562)      
Earnings before Income Taxes 6,067 113,893 120,445 118,617      
Income taxes (benefit) (7,199) 12,121 12,041 11,762      
Net Earnings 13,266 101,772 108,404 106,855      
Valencia non-controlling interest (5,058) (4,172) (14,172) (10,897)      
Subsidiary preferred stock dividends (132) (132) (396) (396)      
Net Earnings Available for PNM Common Stock 8,076 97,468 93,836 95,562      
Total Assets 6,731,852   6,731,852   6,272,166    
Goodwill 51,632   $ 51,632   51,632   $ 51,600
TNMP              
Segment Reporting Information [Line Items]              
Number of operating segments | segment     1        
Segment Reporting Information, Profit (Loss) [Abstract]              
Electric operating revenues 155,517 132,551 $ 408,343 360,936      
Cost of energy 35,951 30,988 106,627 92,220      
Depreciation and amortization 28,357 24,960 83,746 72,914      
Operating income 56,154 43,837 116,668 106,079      
Interest Charges (12,095) (9,851) (33,932) (28,017)      
Earnings before Income Taxes 46,685 36,377 87,245 83,800      
Income taxes (benefit) 7,181 4,946 13,076 11,258      
Net Earnings     74,169 72,542      
Total Assets 3,039,357   3,039,357   2,746,601    
Goodwill 226,665   226,665   $ 226,665 $ 226,700  
PNM              
Segment Reporting Information, Profit (Loss) [Abstract]              
Utility margin 95,721 201,607 356,317 421,327      
Other operating expenses 100,739 108,710 305,615 335,173      
Depreciation and amortization 44,537 45,361 132,287 137,132      
Operating income 30,696 139,915 163,015 234,366      
Interest income (expense) 5,323 3,888 15,542 10,288      
Other income (7,598) (14,443) 3,130 (81,475)      
Interest Charges (22,354) (15,467) (61,242) (44,562)      
Earnings before Income Taxes 6,067 113,893 120,445 118,617      
Income taxes (benefit) (7,199) 12,121 12,041 11,762      
Net Earnings 13,266 101,772 108,404 106,855      
Valencia non-controlling interest (5,058) (4,172) (14,172) (10,897)      
Subsidiary preferred stock dividends (132) (132) (396) (396)      
Net Earnings Available for PNM Common Stock 8,076 97,468 93,836 95,562      
Total Assets 6,731,852 6,113,416 6,731,852 6,113,416      
Goodwill 51,632 51,632 51,632 51,632      
TNMP              
Segment Reporting Information, Profit (Loss) [Abstract]              
Utility margin 81,457 67,614 189,199 172,320      
Other operating expenses 35,055 32,766 101,302 89,723      
Depreciation and amortization 28,357 24,960 83,746 72,914      
Operating income 56,154 43,837 116,668 106,079      
Interest income (expense) 178 148 413 1,435      
Other income 2,448 2,243 4,096 4,303      
Interest Charges (12,095) (9,851) (33,932) (28,017)      
Earnings before Income Taxes 46,685 36,377 87,245 83,800      
Income taxes (benefit) 7,181 4,946 13,076 11,258      
Net Earnings 39,504 31,431 74,169 72,542      
Valencia non-controlling interest 0 0 0 0      
Subsidiary preferred stock dividends 0 0 0 0      
Net Earnings Available for PNM Common Stock 39,504 31,431 74,169 72,542      
Total Assets 3,039,357 2,673,546 3,039,357 2,673,546      
Goodwill 226,665 226,665 226,665 226,665      
Corporate and Other              
Segment Reporting Information, Profit (Loss) [Abstract]              
Utility margin 0 0 0 0      
Other operating expenses (7,100) (5,260) (19,762) (15,835)      
Depreciation and amortization 7,298 6,249 21,372 19,057      
Operating income (198) (989) (1,610) (3,222)      
Interest income (expense) (135) (67) (387) (135)      
Other income 619 181 1,148 384      
Interest Charges (15,389) (9,208) (41,486) (17,384)      
Earnings before Income Taxes (15,103) (10,083) (42,335) (20,357)      
Income taxes (benefit) (5,249) (3,617) (12,375) (6,038)      
Net Earnings (9,854) (6,466) (29,960) (14,319)      
Valencia non-controlling interest 0 0 0 0      
Subsidiary preferred stock dividends 0 0 0 0      
Net Earnings Available for PNM Common Stock (9,854) (6,466) (29,960) (14,319)      
Total Assets 279,632 241,928 279,632 241,928      
Goodwill 0 0 0 0      
Energy              
Segment Reporting Information, Profit (Loss) [Abstract]              
Electric operating revenues 505,851 729,888 1,527,084 1,673,736      
Cost of energy 210,313 334,339 624,451 698,349      
Utility margin 295,538 395,549 902,633 975,387      
Energy | PNM              
Segment Reporting Information, Profit (Loss) [Abstract]              
Cost of energy 174,362 303,351 517,824 606,129      
Energy | PNM              
Segment Reporting Information, Profit (Loss) [Abstract]              
Electric operating revenues 350,334 597,337 1,118,741 1,312,800      
Cost of energy 174,362 303,351 517,824 606,129      
Utility margin 175,972 293,986 600,917 706,671      
Energy | TNMP              
Segment Reporting Information, Profit (Loss) [Abstract]              
Electric operating revenues 155,517 132,551 408,343 360,936      
Cost of energy 35,951 30,988 106,627 92,220      
Utility margin 119,566 101,563 301,716 268,716      
Energy | Corporate and Other              
Segment Reporting Information, Profit (Loss) [Abstract]              
Electric operating revenues 0 0 0 0      
Cost of energy 0 0 0 0      
Utility margin $ 0 $ 0 $ 0 $ 0