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Segment Information (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Segment Reporting Information, Profit (Loss) [Abstract]      
Electric operating revenues $ 317,665 $ 305,374  
Cost of energy 104,706 91,847  
Margin 212,959 213,527  
Other operating expenses 121,448 121,384  
Depreciation and amortization 40,807 38,414  
Operating income 50,704 53,729  
Interest income 2,634 3,292  
Other income (deductions) (110) 2,548  
Net interest charges (31,297) (29,566)  
Earnings before Income Taxes 21,931 30,003  
Income taxes (benefit) 7,969 9,526  
Net Earnings 13,962 20,477  
Valencia non-controlling interest (3,204) (3,265)  
Subsidiary preferred stock dividends (132) (132)  
Net Earnings Attributable to PNMR 10,626 17,080  
Total Assets 5,370,760 5,197,896 5,372,583
Goodwill 278,297 278,297 278,297
Additions to utility and non-utility plant included in accounts payable 9,278 19,770  
PNM Electric [Member]
      
Segment Reporting Information, Profit (Loss) [Abstract]      
Electric operating revenues 257,894 250,416  
Cost of energy 91,660 80,557  
Margin 166,234 169,859  
Other operating expenses 103,161 104,120  
Depreciation and amortization 25,834 23,634  
Operating income 37,239 42,105  
Interest income 2,673 3,335  
Other income (deductions) 1,407 4,982  
Net interest charges (19,957) (18,493)  
Earnings before Income Taxes 21,362 31,929  
Income taxes (benefit) 6,589 10,852  
Net Earnings 14,773 21,077  
Valencia non-controlling interest (3,204) (3,265)  
Subsidiary preferred stock dividends (132) (132)  
Net Earnings Attributable to PNMR 11,437 17,680  
Total Assets 4,155,257 4,031,859  
Goodwill 51,632 51,632  
Additions to utility and non-utility plant included in accounts payable 8,211 18,296  
TNMP Electric [Member]
      
Segment Reporting Information, Profit (Loss) [Abstract]      
Electric operating revenues 59,771 54,958  
Cost of energy 13,046 11,290  
Margin 46,725 43,668  
Other operating expenses 21,990 20,590  
Depreciation and amortization 11,681 11,287  
Operating income 13,054 11,791  
Interest income 0 0  
Other income (deductions) 208 105  
Net interest charges (7,246) (7,097)  
Earnings before Income Taxes 6,016 4,799  
Income taxes (benefit) 2,290 1,788  
Net Earnings 3,726 3,011  
Valencia non-controlling interest 0 0  
Subsidiary preferred stock dividends 0 0  
Net Earnings Attributable to PNMR 3,726 3,011  
Total Assets 1,098,942 1,037,616  
Goodwill 226,665 226,665  
Additions to utility and non-utility plant included in accounts payable 1,055 801  
Corporate and Other [Member]
      
Segment Reporting Information, Profit (Loss) [Abstract]      
Electric operating revenues 0 0  
Cost of energy 0 0  
Margin 0 0  
Other operating expenses (3,703) (3,326)  
Depreciation and amortization 3,292 3,493  
Operating income 411 (167)  
Interest income (39) (43)  
Other income (deductions) (1,725) (2,539)  
Net interest charges (4,094) (3,976)  
Earnings before Income Taxes (5,447) (6,725)  
Income taxes (benefit) (910) (3,114)  
Net Earnings (4,537) (3,611)  
Valencia non-controlling interest 0 0  
Subsidiary preferred stock dividends 0 0  
Net Earnings Attributable to PNMR (4,537) (3,611)  
Total Assets 116,561 128,421  
Goodwill 0 0  
Additions to utility and non-utility plant included in accounts payable $ 12 $ 673