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Segment Information - Schedule (Details)
$ in Thousands
 3 Months Ended 12 Months Ended
Dec. 31, 2019
USD ($)
Sep. 30, 2019
USD ($)
Jun. 30, 2019
USD ($)
Mar. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Sep. 30, 2018
USD ($)
Jun. 30, 2018
USD ($)
Mar. 31, 2018
USD ($)
Dec. 31, 2019
USD ($)
segment
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Segment Reporting Information [Line Items]                      
Operating Revenues $ 344,144 $ 433,586 $ 330,228 $ 349,645 $ 343,756 $ 422,666 $ 352,313 $ 317,878 $ 1,457,603 $ 1,436,613 $ 1,445,003
Other operating expenses                 632,783 559,652 490,543
Depreciation and amortization                 267,808 241,188 231,942
Operating income 60,552 140,540 (93,615) 36,723 (17,404) 127,990 79,329 46,132 144,200 236,047 315,039
Interest income                 14,022 15,540 15,916
Other income (deductions)                 29,643 (15,286) 22,429
Interest charges                 (121,016) (127,244) (127,625)
Earnings before Income Taxes                 66,849 109,057 225,759
Income taxes (benefit)                 (25,282) 7,775 130,340
Net Earnings 35,989 $ 106,763 $ (72,283) $ 21,662 (51,539) $ 91,573 $ 42,449 $ 18,799 92,131 101,282 95,419
Valencia non-controlling interest                 (14,241) (15,112) (15,017)
Subsidiary preferred stock dividends                 (528) (528) (528)
Net Earnings Attributable to PNMR                 77,362 85,642 79,874
Total Assets 7,298,774       6,865,551       7,298,774 6,865,551 6,646,103
Goodwill 278,297       278,297       $ 278,297 278,297 278,297
PNM                      
Segment Reporting Information [Line Items]                      
Number of Operating Segments | segment                 1    
Other operating expenses                 $ 554,661 481,030 414,457
Depreciation and amortization                 160,368 151,866 147,017
Operating income                 61,068 145,033 221,079
Interest income                 14,303 13,089 8,454
Other income (deductions)                 26,989 (17,312) 22,132
Interest charges                 (72,900) (76,458) (82,697)
Earnings before Income Taxes                 29,460 64,352 168,968
Income taxes (benefit)                 (25,962) (5,971) 81,555
Net Earnings                 55,422 70,323 87,413
Valencia non-controlling interest                 (14,241) (15,112) (15,017)
Subsidiary preferred stock dividends                 (528) (528) (528)
Net Earnings Attributable to PNMR                 40,653 54,683 71,868
Total Assets 5,242,991       5,035,883       5,242,991 5,035,883 4,921,563
Goodwill 51,632       51,632       $ 51,632 51,632 51,632
TNMP                      
Segment Reporting Information [Line Items]                      
Number of Operating Segments | segment                 1    
Other operating expenses                 $ 98,621 96,272 98,221
Depreciation and amortization                 84,259 66,189 63,146
Operating income                 85,814 96,497 93,604
Interest income                 0 0 0
Other income (deductions)                 4,131 4,065 3,551
Interest charges                 (29,100) (32,091) (30,084)
Earnings before Income Taxes                 60,845 68,471 67,071
Income taxes (benefit)                 5,046 16,880 31,512
Net Earnings                 55,799 51,591 35,559
Valencia non-controlling interest                 0 0 0
Subsidiary preferred stock dividends                 0 0 0
Net Earnings Attributable to PNMR                 55,799 51,591 35,559
Total Assets 1,860,439       1,665,177       1,860,439 1,665,177 1,500,770
Goodwill 226,665       226,665       226,665 226,665 226,665
Corporate and Other                      
Segment Reporting Information [Line Items]                      
Other operating expenses                 (20,499) (17,650) (22,135)
Depreciation and amortization                 23,181 23,133 21,779
Operating income                 (2,682) (5,483) 356
Interest income                 (281) 2,451 7,462
Other income (deductions)                 (1,477) (2,039) (3,254)
Interest charges                 (19,016) (18,695) (14,844)
Earnings before Income Taxes                 (23,456) (23,766) (10,280)
Income taxes (benefit)                 (4,366) (3,134) 17,273
Net Earnings                 (19,090) (20,632) (27,553)
Valencia non-controlling interest                 0 0 0
Subsidiary preferred stock dividends                 0 0 0
Net Earnings Attributable to PNMR                 (19,090) (20,632) (27,553)
Total Assets 195,344       164,491       195,344 164,491 223,770
Goodwill $ 0       $ 0       0 0 0
Electricity                      
Segment Reporting Information [Line Items]                      
Operating Revenues                 1,457,603 1,436,613 1,445,003
Cost of energy                 412,812 399,726 407,479
Utility margin                 1,044,791 1,036,887 1,037,524
Electricity | PNM                      
Segment Reporting Information [Line Items]                      
Operating Revenues                 1,093,822 1,091,965 1,104,230
Cost of energy                 317,725 314,036 321,677
Utility margin                 776,097 777,929 782,553
Electricity | TNMP                      
Segment Reporting Information [Line Items]                      
Operating Revenues                 363,781 344,648 340,773
Cost of energy                 95,087 85,690 85,802
Utility margin                 268,694 258,958 254,971
Electricity | Corporate and Other                      
Segment Reporting Information [Line Items]                      
Operating Revenues                 0 0 0
Cost of energy                 0 0 0
Utility margin                 $ 0 $ 0 $ 0