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Segment Information - Summarized Financial Information (Details)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2023
USD ($)
Jun. 30, 2022
USD ($)
Jun. 30, 2023
USD ($)
segment
Jun. 30, 2022
USD ($)
Dec. 31, 2022
USD ($)
Apr. 01, 2020
USD ($)
Apr. 01, 2018
USD ($)
Segment Reporting Information, Profit (Loss) [Abstract]              
Electric operating revenues $ 477,156 $ 499,730 $ 1,021,233 $ 943,848      
Utility margin 181,627 170,186 368,338 324,426      
Other operating expenses 133,235 140,973 258,461 272,845      
Depreciation and amortization 79,139 76,769 157,213 152,533      
Operating income 92,330 86,392 191,421 154,460      
Interest income (expense) 5,359 3,327 10,202 7,619      
Other income 5,862 (40,285) 12,904 (64,769)      
Interest Charges (45,899) (29,217) (86,822) (55,437)      
Earnings before Income Taxes 57,652 20,217 127,705 41,873      
Income taxes (benefit) 8,229 1,094 18,009 3,532      
Net Earnings (Loss) 49,423 19,123 109,696 38,341      
Valencia non-controlling interest (3,987) (3,630) (9,114) (6,725)      
Subsidiary preferred stock dividends (132) (132) (264) (264)      
Net Earnings (Loss) Available for PNM Common Stock 45,304 15,361 100,318 31,352      
Total Assets 9,626,970 8,911,105 9,626,970 8,911,105 $ 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 338,242 376,754 $ 768,407 715,463      
Depreciation and amortization 44,064 45,981 87,750 91,771      
Operating income 54,415 49,435 132,319 94,451      
Interest Charges (20,766) (14,523) (38,888) (29,095)      
Earnings before Income Taxes 42,714 (3,637) 114,378 4,724      
Income taxes (benefit) 7,411 (1,182) 19,240 (359)      
Net Earnings (Loss) 35,303 (2,455) 95,138 5,083      
Valencia non-controlling interest (3,987) (3,630) (9,114) (6,725)      
Subsidiary preferred stock dividends (132) (132) (264) (264)      
Net Earnings (Loss) Available for PNM Common Stock 31,184 (6,217) 85,760 (1,906)      
Total Assets 6,440,357   6,440,357   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 138,914 122,976 $ 252,826 228,385      
Cost of energy 38,843 31,632 70,676 61,232      
Depreciation and amortization 27,949 24,312 55,389 47,954      
Operating income 38,727 38,000 60,514 62,242      
Interest Charges (11,412) (9,016) (21,837) (18,166)      
Earnings before Income Taxes 28,948 30,212 40,560 47,423      
Income taxes (benefit) 4,316 4,161 5,895 6,312      
Net Earnings (Loss)     34,665 41,111      
Total Assets 2,916,206   2,916,206   2,746,601    
Goodwill 226,665   226,665   $ 226,665 $ 226,700  
PNM              
Segment Reporting Information, Profit (Loss) [Abstract]              
Utility margin 120,215 110,792 260,596 219,720      
Other operating expenses 106,154 117,374 204,876 226,463      
Depreciation and amortization 44,064 45,981 87,750 91,771      
Operating income 54,415 49,435 132,319 94,451      
Interest income (expense) 5,370 3,267 10,219 6,400      
Other income 3,695 (41,816) 10,728 (67,032)      
Interest Charges (20,766) (14,523) (38,888) (29,095)      
Earnings before Income Taxes 42,714 (3,637) 114,378 4,724      
Income taxes (benefit) 7,411 (1,182) 19,240 (359)      
Net Earnings (Loss) 35,303 (2,455) 95,138 5,083      
Valencia non-controlling interest (3,987) (3,630) (9,114) (6,725)      
Subsidiary preferred stock dividends (132) (132) (264) (264)      
Net Earnings (Loss) Available for PNM Common Stock 31,184 (6,217) 85,760 (1,906)      
Total Assets 6,440,357 6,090,151 6,440,357 6,090,151      
Goodwill 51,632 51,632 51,632 51,632      
TNMP              
Segment Reporting Information, Profit (Loss) [Abstract]              
Utility margin 61,412 59,394 107,742 104,706      
Other operating expenses 33,395 29,032 66,247 56,957      
Depreciation and amortization 27,949 24,312 55,389 47,954      
Operating income 38,727 38,000 60,514 62,242      
Interest income (expense) 121 105 235 1,287      
Other income 1,512 1,123 1,648 2,060      
Interest Charges (11,412) (9,016) (21,837) (18,166)      
Earnings before Income Taxes 28,948 30,212 40,560 47,423      
Income taxes (benefit) 4,316 4,161 5,895 6,312      
Net Earnings (Loss) 24,632 26,051 34,665 41,111      
Valencia non-controlling interest 0 0 0 0      
Subsidiary preferred stock dividends 0 0 0 0      
Net Earnings (Loss) Available for PNM Common Stock 24,632 26,051 34,665 41,111      
Total Assets 2,916,206 2,583,602 2,916,206 2,583,602      
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 (6,314) (5,433) (12,662) (10,575)      
Depreciation and amortization 7,126 6,476 14,074 12,808      
Operating income (812) (1,043) (1,412) (2,233)      
Interest income (expense) (132) (45) (252) (68)      
Other income 655 408 528 203      
Interest Charges (13,721) (5,678) (26,097) (8,176)      
Earnings before Income Taxes (14,010) (6,358) (27,233) (10,274)      
Income taxes (benefit) (3,498) (1,885) (7,126) (2,421)      
Net Earnings (Loss) (10,512) (4,473) (20,107) (7,853)      
Valencia non-controlling interest 0 0 0 0      
Subsidiary preferred stock dividends 0 0 0 0      
Net Earnings (Loss) Available for PNM Common Stock (10,512) (4,473) (20,107) (7,853)      
Total Assets 270,407 237,352 270,407 237,352      
Goodwill 0 0 0 0      
Energy              
Segment Reporting Information, Profit (Loss) [Abstract]              
Electric operating revenues 477,156 499,730 1,021,233 943,848      
Cost of energy 172,452 195,596 414,138 364,010      
Utility margin 304,704 304,134 607,095 579,838      
Energy | PNM              
Segment Reporting Information, Profit (Loss) [Abstract]              
Cost of energy 133,609 163,964 343,462 302,778      
Energy | PNM              
Segment Reporting Information, Profit (Loss) [Abstract]              
Electric operating revenues 338,242 376,754 768,407 715,463      
Cost of energy 133,609 163,964 343,462 302,778      
Utility margin 204,633 212,790 424,945 412,685      
Energy | TNMP              
Segment Reporting Information, Profit (Loss) [Abstract]              
Electric operating revenues 138,914 122,976 252,826 228,385      
Cost of energy 38,843 31,632 70,676 61,232      
Utility margin 100,071 91,344 182,150 167,153      
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