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Segment Information - Schedule (Details) - USD ($)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Dec. 31, 2017
Sep. 30, 2017
Jun. 30, 2017
Mar. 31, 2017
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Segment Reporting Information [Line Items]                      
Operating Revenues                 $ 1,436,613 $ 1,445,003 $ 1,362,951
Utility margin                 1,036,887 1,037,524 982,355
Other operating expenses                 559,652 490,543 488,520
Depreciation and amortization                 241,188 231,942 209,110
Operating income $ (17,404) $ 127,990 $ 79,329 $ 46,132 $ 22,936 $ 142,484 $ 85,105 $ 55,960 236,047 315,039 284,725
Interest income                 15,540 15,916 22,293
Other income (deductions)                 (15,286) 22,429 16,789
Interest charges                 (127,244) (127,625) (128,633)
Earnings before Income Taxes                 109,057 225,759 195,174
Income taxes (benefit)                 7,775 130,340 63,278
Net Earnings (51,539) 91,573 42,449 18,799 (50,585) 78,327 41,231 26,446 101,282 95,419 131,896
Valencia non-controlling interest                 (15,112) (15,017) (14,519)
Subsidiary preferred stock dividends                 (528) (528) (528)
Net Earnings Attributable to PNMR                 85,642 79,874 116,849
Total Assets 6,865,551       6,646,103       6,865,551 6,646,103 6,471,080
Goodwill 278,297       278,297       278,297 278,297 278,297
PNM                      
Segment Reporting Information [Line Items]                      
Utility margin                 777,929 782,553 736,199
Other operating expenses                 481,030 414,457 407,922
Depreciation and amortization                 151,866 147,017 133,447
Operating income                 145,033 221,079 194,830
Interest income                 13,089 8,454 10,173
Other income (deductions)                 (17,312) 22,132 15,326
Interest charges                 (76,458) (82,697) (87,469)
Earnings before Income Taxes                 64,352 168,968 132,860
Income taxes (benefit)                 (5,971) 81,555 40,922
Net Earnings                 70,323 87,413 91,938
Valencia non-controlling interest                 (15,112) (15,017) (14,519)
Subsidiary preferred stock dividends                 (528) (528) (528)
Net Earnings Attributable to PNMR                 54,683 71,868 76,891
Total Assets 5,035,883       4,921,563       5,035,883 4,921,563 4,867,546
Goodwill 51,632       51,632       51,632 51,632 51,632
TNMP                      
Segment Reporting Information [Line Items]                      
Utility margin                 258,958 254,971 246,156
Other operating expenses                 96,272 98,221 93,389
Depreciation and amortization                 66,189 63,146 61,126
Operating income                 96,497 93,604 91,641
Interest income                 0 0 0
Other income (deductions)                 4,065 3,551 3,202
Interest charges                 (32,091) (30,084) (29,335)
Earnings before Income Taxes                 68,471 67,071 65,508
Income taxes (benefit)                 16,880 31,512 23,836
Net Earnings                 51,591 35,559 41,672
Valencia non-controlling interest                 0 0 0
Subsidiary preferred stock dividends                 0 0 0
Net Earnings Attributable to PNMR                 51,591 35,559 41,672
Total Assets 1,665,177       1,500,770       1,665,177 1,500,770 1,383,223
Goodwill 226,665       226,665       226,665 226,665 226,665
Corporate and Other                      
Segment Reporting Information [Line Items]                      
Utility margin                 0 0 0
Other operating expenses                 (17,650) (22,135) (12,791)
Depreciation and amortization                 23,133 21,779 14,537
Operating income                 (5,483) 356 (1,746)
Interest income                 2,451 7,462 12,120
Other income (deductions)                 (2,039) (3,254) (1,739)
Interest charges                 (18,695) (14,844) (11,829)
Earnings before Income Taxes                 (23,766) (10,280) (3,194)
Income taxes (benefit)                 (3,134) 17,273 (1,480)
Net Earnings                 (20,632) (27,553) (1,714)
Valencia non-controlling interest                 0 0 0
Subsidiary preferred stock dividends                 0 0 0
Net Earnings Attributable to PNMR                 (20,632) (27,553) (1,714)
Total Assets 164,491       223,770       164,491 223,770 220,311
Goodwill 0       0       0 0 0
Electricity                      
Segment Reporting Information [Line Items]                      
Operating Revenues $ 343,756 $ 422,666 $ 352,313 $ 317,878 $ 332,605 $ 419,900 $ 362,320 $ 330,178 1,436,613 1,445,003 1,362,951
Cost of energy                 399,726 407,479 380,596
Electricity | PNM                      
Segment Reporting Information [Line Items]                      
Operating Revenues                 1,091,965 1,104,230 1,035,913
Cost of energy                 314,036 321,677 299,714
Electricity | TNMP                      
Segment Reporting Information [Line Items]                      
Operating Revenues                 344,648 340,773 327,038
Cost of energy                 85,690 85,802 80,882
Electricity | Corporate and Other                      
Segment Reporting Information [Line Items]                      
Operating Revenues                 0 0 0
Cost of energy                 $ 0 $ 0 $ 0