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Segment Information - Summarized Financial Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2016
Segment Reporting Information, Profit (Loss) [Abstract]          
Electric operating revenues $ 362,320 $ 315,391 $ 692,498 $ 626,352  
Cost of energy 104,267 81,363 207,070 173,732  
Utility margin 258,053 234,028 485,428 452,620  
Other operating expenses 115,323 118,251 230,355 245,507  
Depreciation and amortization 57,625 50,955 114,008 100,784  
Operating income 85,105 64,822 141,065 106,329  
Interest income 3,885 10,194 8,766 13,815  
Other income (deductions) 6,209 4,791 14,288 12,275  
Interest charges (32,332) (33,221) (64,031) (64,712)  
Earnings before Income Taxes 62,867 46,586 100,088 67,707  
Income taxes (benefit) 21,636 15,634 32,411 22,790  
Net Earnings 41,231 30,952 67,677 44,917  
Valencia non-controlling interest (3,544) (3,744) (6,996) (7,031)  
Subsidiary preferred stock dividends (132) (132) (264) (264)  
Net Earnings Available for PNM Common Stock 37,555 27,076 60,417 37,622  
Total Assets 6,584,445 6,360,456 6,584,445 6,360,456 $ 6,471,080
Goodwill 278,297 278,297 278,297 278,297 $ 278,297
PNM          
Segment Reporting Information, Profit (Loss) [Abstract]          
Electric operating revenues 276,097 233,346 527,655 468,952  
Cost of energy 82,952 61,367 164,268 133,811  
Utility margin 193,145 171,979 363,387 335,141  
Other operating expenses 97,533 97,617 193,427 205,619  
Depreciation and amortization 36,448 32,602 72,464 64,466  
Operating income 59,164 41,760 97,496 65,056  
Interest income 1,858 5,518 4,675 7,040  
Other income (deductions) 5,900 4,382 13,582 12,325  
Interest charges (20,931) (22,690) (41,943) (44,281)  
Earnings before Income Taxes 45,991 28,970 73,810 40,140  
Income taxes (benefit) 15,515 9,177 23,223 12,788  
Net Earnings 30,476 19,793 50,587 27,352  
Valencia non-controlling interest (3,544) (3,744) (6,996) (7,031)  
Subsidiary preferred stock dividends (132) (132) (264) (264)  
Net Earnings Available for PNM Common Stock 26,800 15,917 43,327 20,057  
Total Assets 4,939,407 4,775,481 4,939,407 4,775,481  
Goodwill 51,632 51,632 51,632 51,632  
TNMP          
Segment Reporting Information, Profit (Loss) [Abstract]          
Electric operating revenues 86,223 82,045 164,843 157,400  
Cost of energy 21,315 19,996 42,802 39,921  
Utility margin 64,908 62,049 122,041 117,479  
Other operating expenses 23,025 23,777 46,822 46,144  
Depreciation and amortization 15,597 14,897 30,968 29,406  
Operating income 26,286 23,375 44,251 41,929  
Interest income 0 0 0 0  
Other income (deductions) 432 677 1,165 1,285  
Interest charges (7,510) (7,473) (14,915) (14,841)  
Earnings before Income Taxes 19,208 16,579 30,501 28,373  
Income taxes (benefit) 7,004 6,071 10,693 10,408  
Net Earnings 12,204 10,508 19,808 17,965  
Valencia non-controlling interest 0 0 0 0  
Subsidiary preferred stock dividends 0 0 0 0  
Net Earnings Available for PNM Common Stock 12,204 10,508 19,808 17,965  
Total Assets 1,437,547 1,339,525 1,437,547 1,339,525  
Goodwill 226,665 226,665 226,665 226,665  
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  
Other operating expenses (5,235) (3,143) (9,894) (6,256)  
Depreciation and amortization 5,580 3,456 10,576 6,912  
Operating income (345) (313) (682) (656)  
Interest income 2,027 4,676 4,091 6,775  
Other income (deductions) (123) (268) (459) (1,335)  
Interest charges (3,891) (3,058) (7,173) (5,590)  
Earnings before Income Taxes (2,332) 1,037 (4,223) (806)  
Income taxes (benefit) (883) 386 (1,505) (406)  
Net Earnings (1,449) 651 (2,718) (400)  
Valencia non-controlling interest 0 0 0 0  
Subsidiary preferred stock dividends 0 0 0 0  
Net Earnings Available for PNM Common Stock (1,449) 651 (2,718) (400)  
Total Assets 207,491 245,450 207,491 245,450  
Goodwill $ 0 $ 0 $ 0 $ 0