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Segment Information (Details) - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Apr. 01, 2016
Dec. 31, 2015
Apr. 01, 2015
Segment Reporting Information, Profit (Loss) [Abstract]              
Electric operating revenues $ 315,391 $ 352,887 $ 626,352 $ 685,755      
Cost of energy 81,363 114,038 173,732 229,683      
Utility margin 234,028 238,849 452,620 456,072      
Other operating expenses 118,251 120,386 245,507 242,578      
Depreciation and amortization 50,955 46,049 100,784 91,510      
Operating income 64,822 72,414 106,329 121,984      
Interest income 10,194 1,941 13,815 3,691      
Other income (deductions) 4,791 7,566 12,275 12,889      
Net interest charges (33,221) (28,913) (64,712) (59,186)      
Earnings before Income Taxes 46,586 53,008 67,707 79,378      
Income taxes 15,634 17,353 22,790 25,870      
Net Earnings 30,952 35,655 44,917 53,508      
Valencia non-controlling interest (3,744) (3,850) (7,031) (7,231)      
Subsidiary preferred stock dividends (132) (132) (264) (264)      
Net Earnings Available for PNM Common Stock 27,076 31,673 37,622 46,013      
Total Assets 6,360,456 5,888,796 6,360,456 5,888,796   $ 6,009,328  
Goodwill 278,297 278,297 278,297 278,297   278,297  
Adjustments for New Accounting Pronouncement [Member]              
Segment Reporting Information [Line Items]              
Amounts previously reported, reclassified       38,200      
Public Service Company of New Mexico [Member]              
Segment Reporting Information, Profit (Loss) [Abstract]              
Electric operating revenues 233,346 275,450 468,952 537,390      
Cost of energy 61,367 95,728 133,811 193,594      
Depreciation and amortization 32,602 29,002 64,466 57,405      
Operating income 41,760 47,179 65,056 78,834      
Interest income 5,518 1,946 7,040 3,717      
Net interest charges (22,690) (19,681) (44,281) (39,640)      
Earnings before Income Taxes 28,970 36,890 40,140 56,168      
Income taxes 9,177 11,527 12,788 17,302      
Net Earnings 19,793 25,363 27,352 38,866      
Valencia non-controlling interest (3,744) (3,850) (7,031) (7,231)      
Subsidiary preferred stock dividends (132) (132) (264) (264)      
Net Earnings Available for PNM Common Stock 15,917 21,381 20,057 31,371      
Total Assets 4,775,481   4,775,481     4,599,344  
Goodwill 51,632   51,632   $ 51,600 51,632 $ 51,600
Public Service Company of New Mexico [Member] | Adjustments for New Accounting Pronouncement [Member]              
Segment Reporting Information [Line Items]              
Amounts previously reported, reclassified       19,900      
Texas-New Mexico Power Company [Member]              
Segment Reporting Information, Profit (Loss) [Abstract]              
Electric operating revenues 82,045 77,437 157,400 148,365      
Cost of energy 19,996 18,310 39,921 36,089      
Depreciation and amortization 14,897 13,591 29,406 27,049      
Operating income 23,375 24,729 41,929 42,660      
Net interest charges (7,473) (6,856) (14,841) (13,781)      
Earnings before Income Taxes 16,579 18,666 28,373 30,963      
Income taxes 6,071 6,801 10,408 11,404      
Total Assets 1,339,525   1,339,525     1,297,139  
Goodwill 226,665   226,665   $ 226,700 $ 226,665  
Texas-New Mexico Power Company [Member] | Adjustments for New Accounting Pronouncement [Member]              
Segment Reporting Information [Line Items]              
Amounts previously reported, reclassified       10,600      
Public Service Company of New Mexico [Member]              
Segment Reporting Information, Profit (Loss) [Abstract]              
Electric operating revenues 233,346 275,450 468,952 537,390      
Cost of energy 61,367 95,728 133,811 193,594      
Utility margin 171,979 179,722 335,141 343,796      
Other operating expenses 97,617 103,541 205,619 207,557      
Depreciation and amortization 32,602 29,002 64,466 57,405      
Operating income 41,760 47,179 65,056 78,834      
Interest income 5,518 1,946 7,040 3,717      
Other income (deductions) 4,382 7,446 12,325 13,257      
Net interest charges (22,690) (19,681) (44,281) (39,640)      
Earnings before Income Taxes 28,970 36,890 40,140 56,168      
Income taxes 9,177 11,527 12,788 17,302      
Net Earnings 19,793 25,363 27,352 38,866      
Valencia non-controlling interest (3,744) (3,850) (7,031) (7,231)      
Subsidiary preferred stock dividends (132) (132) (264) (264)      
Net Earnings Available for PNM Common Stock 15,917 21,381 20,057 31,371      
Total Assets 4,775,481 4,524,390 4,775,481 4,524,390      
Goodwill 51,632 51,632 51,632 51,632      
Texas-New Mexico Power Company [Member]              
Segment Reporting Information, Profit (Loss) [Abstract]              
Electric operating revenues 82,045 77,437 157,400 148,365      
Cost of energy 19,996 18,310 39,921 36,089      
Utility margin 62,049 59,127 117,479 112,276      
Other operating expenses 23,777 20,807 46,144 42,567      
Depreciation and amortization 14,897 13,591 29,406 27,049      
Operating income 23,375 24,729 41,929 42,660      
Interest income 0 0 0 0      
Other income (deductions) 677 793 1,285 2,084      
Net interest charges (7,473) (6,856) (14,841) (13,781)      
Earnings before Income Taxes 16,579 18,666 28,373 30,963      
Income taxes 6,071 6,801 10,408 11,404      
Net Earnings 10,508 11,865 17,965 19,559      
Valencia non-controlling interest 0 0 0 0      
Subsidiary preferred stock dividends 0 0 0 0      
Net Earnings Available for PNM Common Stock 10,508 11,865 17,965 19,559      
Total Assets 1,339,525 1,258,285 1,339,525 1,258,285      
Goodwill 226,665 226,665 226,665 226,665      
Corporate and Other [Member]              
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 (3,143) (3,962) (6,256) (7,546)      
Depreciation and amortization 3,456 3,456 6,912 7,056      
Operating income (313) 506 (656) 490      
Interest income 4,676 (5) 6,775 (26)      
Other income (deductions) (268) (673) (1,335) (2,452)      
Net interest charges (3,058) (2,376) (5,590) (5,765)      
Earnings before Income Taxes 1,037 (2,548) (806) (7,753)      
Income taxes 386 (975) (406) (2,836)      
Net Earnings 651 (1,573) (400) (4,917)      
Valencia non-controlling interest 0 0 0 0      
Subsidiary preferred stock dividends 0 0 0 0      
Net Earnings Available for PNM Common Stock 651 (1,573) (400) (4,917)      
Total Assets 245,450 106,121 245,450 106,121      
Goodwill $ 0 $ 0 $ 0 $ 0