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Segment Information (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended9 Months Ended3 Months Ended9 Months Ended3 Months Ended9 Months Ended3 Months Ended9 Months Ended3 Months Ended9 Months Ended3 Months Ended9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Dec. 31, 2010
Sep. 30, 2011
PNM Electric [Member]
Sep. 30, 2010
PNM Electric [Member]
Sep. 30, 2011
PNM Electric [Member]
Sep. 30, 2010
PNM Electric [Member]
Sep. 30, 2011
TNMP Electric [Member]
Sep. 30, 2010
TNMP Electric [Member]
Sep. 30, 2011
TNMP Electric [Member]
Sep. 30, 2010
TNMP Electric [Member]
Sep. 30, 2011
First Choice [Member]
Sep. 30, 2010
First Choice [Member]
Sep. 30, 2011
First Choice [Member]
Sep. 30, 2010
First Choice [Member]
Sep. 30, 2011
Corporate and Other [Member]
Sep. 30, 2010
Corporate and Other [Member]
Sep. 30, 2011
Corporate and Other [Member]
Sep. 30, 2010
Corporate and Other [Member]
Sep. 30, 2010
Optim Energy [Member]
Sep. 30, 2011
Optim Energy [Member]
Sep. 30, 2010
Optim Energy [Member]
Sep. 23, 2011
Optim Energy [Member]
Sep. 22, 2011
Optim Energy [Member]
Segment Reporting Information [Line Items]                          
Equity Method Investment, Ownership Percentage                        1.00%50.00%
Segment Reporting Information, Profit (Loss) [Abstract]                          
Electric Operating Revenues$ 549,498$ 503,653$ 1,352,747$ 1,292,865 $ 323,760$ 304,268$ 797,232$ 777,864$ 54,787$ 49,709$ 150,175$ 131,233$ 170,999$ 149,729$ 405,485$ 384,034$ (48)$ (53)$ (145)$ (266)     
Intersegment revenues0000 000012,19611,49530,60830,7170000(12,196)(11,495)(30,608)(30,717)     
Total revenues549,498503,6531,352,7471,292,865 323,760304,268797,232777,86466,98361,204180,783161,950170,999149,729405,485384,034(12,244)(11,548)(30,753)(30,983)     
Cost of energy250,854215,169582,814557,238 108,70898,030279,419264,10210,3079,27630,71927,383144,035119,358303,285296,469(12,196)(11,495)(30,609)(30,716)     
Gross margin298,644288,484769,933735,627 215,052206,238517,813513,76256,67651,928150,064134,56726,96430,371102,20087,565(48)(53)(144)(267)     
Other operating expenses147,990144,096457,454432,430 102,080102,452329,502318,35322,45120,71167,43158,53425,07623,95267,69365,652(1,617)(3,019)(7,172)(10,109)     
Depreciation and amortization42,37038,980119,115113,634 25,05823,11171,69168,88712,67411,59433,66231,7283462109876834,2924,06512,77512,336     
Operating income108,284105,408193,364189,563 87,91480,675116,620126,52221,55119,62348,97144,3051,5426,20933,52021,230(2,723)(1,099)(5,747)(2,494)     
Interest income3,7484,49912,01014,608 3,7704,52312,05214,53810112936316(52)(27)(106)53     
Equity in net earnings (loss) of Optim Energy02,4950(5,714)  0 0 0 0 0 0 2,495 (5,714)2,5000(5,700)  
Other income (deductions)(7,039)321(391)7,078 (5,573)1,9024,12911,06931388887717(115)(66)(494)(164)(1,664)(1,603)(4,913)(4,544)     
Net interest charges(31,124)(31,317)(92,251)(94,488) (18,487)(18,011)(54,593)(54,473)(7,276)(7,661)(21,880)(23,483)(249)(364)(535)(1,062)(5,112)(5,281)(15,243)(15,470)     
Earnings before Income Taxes73,86981,406112,732111,047 67,62469,08978,20897,65614,58912,05027,97921,5401,2075,78232,55420,020(9,551)(5,515)(26,009)(28,169)     
Income taxes (benefit)25,96428,81337,20637,365 25,05225,92626,57434,7485,7214,72110,8458,4615942,22511,8337,363(5,403)(4,059)(12,046)(13,207)     
Net earnings47,90552,59375,52673,682 42,57243,16351,63462,9088,8687,32917,13413,0796133,55720,72112,657(4,148)(1,456)(13,963)(14,962)     
Valencia non-controlling interest(4,111)(3,909)(10,764)(10,305) (4,111)(3,909)(10,764)(10,305)000000000000     
Subsidiary preferred stock dividends(132)(132)(396)(396) (132)(132)(396)(396)000000000000     
Net Earnings Attributable to PNMR43,66248,55264,36662,981 38,32939,12240,47452,2078,8687,32917,13413,0796133,55720,72112,657(4,148)(1,456)(13,963)(14,962)     
Total Assets5,372,6405,380,8095,372,6405,380,8095,225,0833,936,4683,812,8293,936,4683,812,8291,041,6131,004,7851,041,6131,004,785274,741259,621274,741259,621119,818303,574119,818303,574     
Goodwill321,310321,310321,310321,310 51,63251,63251,63251,632226,665226,665226,665226,66543,01343,01343,01343,0130000     
Additions to utility and non-utility plant included in accounts payable$ 11,842 $ 11,842  $ 6,811 $ 6,811 $ 4,672 $ 4,672 $ 106 $ 106 $ 253 $ 253