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Segment Information (Details) - USD ($)
$ in Thousands
 3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
Dec. 31, 2015
Segment Reporting Information, Profit (Loss) [Abstract]      
Electric operating revenues $ 310,961 $ 332,868  
Cost of energy 92,369 115,645  
Utility margin 218,592 217,223  
Other operating expenses 127,255 122,193  
Depreciation and amortization 49,829 45,461  
Operating income 41,508 49,569  
Interest income 3,622 1,750  
Other income (deductions) 7,483 5,323  
Net interest charges (31,491) (30,273)  
Earnings before Income Taxes 21,122 26,369  
Income taxes 7,157 8,517  
Net Earnings 13,965 17,852  
Valencia non-controlling interest (3,287) (3,380)  
Subsidiary preferred stock dividends (132) (132)  
Net Earnings Available for PNM Common Stock 10,546 14,340  
Total Assets 6,273,812 5,900,606 $ 6,009,328
Goodwill 278,297 278,297 278,297
Adjustments for New Accounting Pronouncement [Member]      
Segment Reporting Information [Line Items]      
Amounts previously reported, reclassified 38,700    
Public Service Company of New Mexico [Member]      
Segment Reporting Information, Profit (Loss) [Abstract]      
Electric operating revenues 235,606 261,940  
Cost of energy 72,444 97,866  
Depreciation and amortization 31,864 28,403  
Operating income 23,297 31,655  
Interest income 1,522 1,771  
Net interest charges (21,591) (19,959)  
Earnings before Income Taxes 11,171 19,277  
Income taxes 3,610 5,775  
Net Earnings 7,561 13,502  
Valencia non-controlling interest (3,287) (3,380)  
Subsidiary preferred stock dividends (132) (132)  
Net Earnings Available for PNM Common Stock 4,142 9,990  
Total Assets 4,719,346   4,599,344
Goodwill 51,632   51,632
Public Service Company of New Mexico [Member] | Adjustments for New Accounting Pronouncement [Member]      
Segment Reporting Information [Line Items]      
Amounts previously reported, reclassified 20,200    
Texas-New Mexico Power Company [Member]      
Segment Reporting Information, Profit (Loss) [Abstract]      
Electric operating revenues 75,355 70,928  
Cost of energy 19,925 17,779  
Depreciation and amortization 14,508 13,458  
Operating income 18,554 17,931  
Net interest charges (7,369) (6,925)  
Earnings before Income Taxes 11,793 12,297  
Income taxes 4,337 4,603  
Total Assets 1,312,402   1,297,139
Goodwill 226,665   $ 226,665
Texas-New Mexico Power Company [Member] | Adjustments for New Accounting Pronouncement [Member]      
Segment Reporting Information [Line Items]      
Amounts previously reported, reclassified 10,700    
Public Service Company of New Mexico [Member]      
Segment Reporting Information, Profit (Loss) [Abstract]      
Electric operating revenues 235,606 261,940  
Cost of energy 72,444 97,866  
Utility margin 163,162 164,074  
Other operating expenses 108,001 104,016  
Depreciation and amortization 31,864 28,403  
Operating income 23,297 31,655  
Interest income 1,522 1,771  
Other income (deductions) 7,943 5,810  
Net interest charges (21,591) (19,959)  
Earnings before Income Taxes 11,171 19,277  
Income taxes 3,610 5,775  
Net Earnings 7,561 13,502  
Valencia non-controlling interest (3,287) (3,380)  
Subsidiary preferred stock dividends (132) (132)  
Net Earnings Available for PNM Common Stock 4,142 9,990  
Total Assets 4,719,346 4,444,290  
Goodwill   51,632  
Texas-New Mexico Power Company [Member]      
Segment Reporting Information, Profit (Loss) [Abstract]      
Electric operating revenues 75,355 70,928  
Cost of energy 19,925 17,779  
Utility margin 55,430 53,149  
Other operating expenses 22,368 21,760  
Depreciation and amortization 14,508 13,458  
Operating income 18,554 17,931  
Interest income 0 0  
Other income (deductions) 608 1,291  
Net interest charges (7,369) (6,925)  
Earnings before Income Taxes 11,793 12,297  
Income taxes 4,337 4,603  
Net Earnings 7,456 7,694  
Valencia non-controlling interest 0 0  
Subsidiary preferred stock dividends 0 0  
Net Earnings Available for PNM Common Stock 7,456 7,694  
Total Assets 1,312,402 1,232,687  
Goodwill   226,665  
Corporate and Other [Member]      
Segment Reporting Information, Profit (Loss) [Abstract]      
Electric operating revenues 0 0  
Cost of energy 0 0  
Utility margin 0 0  
Other operating expenses (3,114) (3,583)  
Depreciation and amortization 3,457 3,600  
Operating income (343) (17)  
Interest income 2,100 (21)  
Other income (deductions) (1,068) (1,778)  
Net interest charges (2,531) (3,389)  
Earnings before Income Taxes (1,842) (5,205)  
Income taxes (790) (1,861)  
Net Earnings (1,052) (3,344)  
Valencia non-controlling interest 0 0  
Subsidiary preferred stock dividends 0 0  
Net Earnings Available for PNM Common Stock (1,052) (3,344)  
Total Assets 242,064 223,629  
Goodwill $ 0 $ 0