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Segment Information (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended
Mar. 31, 2012
Mar. 31, 2011
Dec. 31, 2011
Segment Reporting Information, Profit (Loss) [Abstract]      
Electric operating revenues $ 305,374 $ 387,663  
Electric revenues from non-affiliates   387,663  
Intersegment revenues   0  
Total revenues   387,663  
Cost of energy 91,847 158,507  
Gross margin 213,527 229,156  
Other operating expenses 121,384 138,463  
Depreciation and amortization 38,414 38,473  
Operating income 53,729 52,220  
Interest income 3,292 4,028  
Other income (deductions) 2,548 3,825  
Net interest charges (29,566) (30,615)  
Earnings before Income Taxes 30,003 29,458  
Income taxes (benefit) 9,526 9,506  
Net Earnings 20,477 19,952  
Valencia non-controlling interest (3,265) (3,183)  
Subsidiary preferred stock dividends (132) (132)  
Net Earnings (Loss) Attributable to PNMR 17,080 16,637  
Total Assets 5,197,896 5,213,726 5,204,613
Goodwill 278,297 321,310 278,297
Additions to utility and non-utility plant included in accounts payable 19,770    
PNM Electric [Member]
      
Segment Reporting Information, Profit (Loss) [Abstract]      
Electric operating revenues 250,416    
Electric revenues from non-affiliates   234,238  
Intersegment revenues   0  
Total revenues   234,238  
Cost of energy 80,557 89,214  
Gross margin 169,859 145,024  
Other operating expenses 104,120 103,124  
Depreciation and amortization 23,634 23,735  
Operating income 42,105 18,165  
Interest income 3,335 4,057  
Other income (deductions) 4,982 5,217  
Net interest charges (18,493) (18,080)  
Earnings before Income Taxes 31,929 9,359  
Income taxes (benefit) 10,852 2,395  
Net Earnings 21,077 6,964  
Valencia non-controlling interest (3,265) (3,183)  
Subsidiary preferred stock dividends (132) (132)  
Net Earnings (Loss) Attributable to PNMR 17,680 3,649  
Total Assets 4,031,859 3,866,571  
Goodwill 51,632 51,632  
Additions to utility and non-utility plant included in accounts payable 18,296    
TNMP Electric [Member]
      
Segment Reporting Information, Profit (Loss) [Abstract]      
Electric operating revenues 54,958    
Electric revenues from non-affiliates   45,028  
Intersegment revenues   8,814  
Total revenues   53,842  
Cost of energy 11,290 10,153  
Gross margin 43,668 43,689  
Other operating expenses 20,590 19,703  
Depreciation and amortization 11,287 10,262  
Operating income 11,791 13,724  
Interest income 0 0  
Other income (deductions) 105 316  
Net interest charges (7,097) (7,299)  
Earnings before Income Taxes 4,799 6,741  
Income taxes (benefit) 1,788 2,578  
Net Earnings 3,011 4,163  
Valencia non-controlling interest 0 0  
Subsidiary preferred stock dividends 0 0  
Net Earnings (Loss) Attributable to PNMR 3,011 4,163  
Total Assets 1,037,616 1,011,252  
Goodwill 226,665 226,665  
Additions to utility and non-utility plant included in accounts payable 801    
First Choice [Member]
      
Segment Reporting Information, Profit (Loss) [Abstract]      
Electric revenues from non-affiliates   108,450  
Intersegment revenues   0  
Total revenues   108,450  
Cost of energy   67,954  
Gross margin   40,496  
Other operating expenses   18,987  
Depreciation and amortization   280  
Operating income   21,229  
Interest income   4  
Other income (deductions)   (106)  
Net interest charges   (146)  
Earnings before Income Taxes   20,981  
Income taxes (benefit)   7,492  
Net Earnings   13,489  
Valencia non-controlling interest   0  
Subsidiary preferred stock dividends   0  
Net Earnings (Loss) Attributable to PNMR   13,489  
Total Assets   215,457  
Goodwill   43,013  
Corporate and Other [Member]
      
Segment Reporting Information, Profit (Loss) [Abstract]      
Electric operating revenues 0    
Electric revenues from non-affiliates   (53)  
Intersegment revenues   (8,814)  
Total revenues   (8,867)  
Cost of energy 0 (8,814)  
Gross margin 0 (53)  
Other operating expenses (3,326) (3,351)  
Depreciation and amortization 3,493 4,196  
Operating income (167) (898)  
Interest income (43) (33)  
Other income (deductions) (2,539) (1,602)  
Net interest charges (3,976) (5,090)  
Earnings before Income Taxes (6,725) (7,623)  
Income taxes (benefit) (3,114) (2,959)  
Net Earnings (3,611) (4,664)  
Valencia non-controlling interest 0 0  
Subsidiary preferred stock dividends 0 0  
Net Earnings (Loss) Attributable to PNMR (3,611) (4,664)  
Total Assets 128,421 120,446  
Goodwill 0 0  
Additions to utility and non-utility plant included in accounts payable $ 673