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Quarterly Operating Results (Unaudited) (Details) (USD $)
 3 Months Ended 12 Months Ended
Dec. 31, 2012
Sep. 30, 2012
Jun. 30, 2012
Mar. 31, 2012
Dec. 31, 2011
Sep. 30, 2011
Jun. 30, 2011
Mar. 31, 2011
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Segment Reporting Information [Line Items]                      
Operating revenues $ 322,758,000 $ 390,411,000 $ 323,860,000 $ 305,374,000 $ 347,872,000 $ 549,498,000 $ 415,586,000 $ 387,663,000 $ 1,342,403,000 $ 1,700,619,000 $ 1,673,517,000
Operating income 36,736,000 118,150,000 65,106,000 53,729,000 63,935,000 108,284,000 32,860,000 52,220,000 273,721,000 257,299,000 239,452,000
Net earnings 12,573,000 61,976,000 25,099,000 20,477,000 115,408,000 [1] 47,905,000 [1] 7,669,000 [1] 19,952,000 [1] 120,125,000 190,934,000 (31,124,000)
Net Earnings (Loss) Attributable to PNMR 9,091,000 57,864,000 21,512,000 17,080,000 111,993,000 43,662,000 4,067,000 16,637,000 105,547,000 176,359,000 (45,215,000)
Net Earnings (Loss) Attributable to PNMR per Common Share:                      
Basic (dollars per share) $ 0.11 $ 0.73 $ 0.27 $ 0.21 $ 1.36 $ 0.48 $ 0.04 $ 0.18 $ 1.32 $ 1.98 $ (0.49)
Diluted (dollars per share) $ 0.11 $ 0.72 $ 0.27 $ 0.21 $ 1.35 $ 0.48 $ 0.04 $ 0.18 $ 1.31 $ 1.96 $ (0.49)
Gain on sale of business segment                 1,012,000 174,925,000 0
Public Service Company of New Mexico [Member]
                      
Segment Reporting Information [Line Items]                      
Operating revenues 260,023,000 321,731,000 260,094,000 250,416,000 260,057,000 323,760,000 239,234,000 234,238,000 1,092,264,000 1,057,289,000 1,017,128,000
Operating income 20,135,000 96,973,000 46,669,000 42,105,000 44,821,000 87,914,000 10,543,000 18,165,000 205,882,000 161,443,000 148,122,000
Net earnings 9,293,000 54,891,000 20,340,000 21,077,000 16,905,000 42,572,000 2,097,000 6,964,000 105,601,000 68,538,000 70,861,000
Net Earnings (Loss) Attributable to PNMR 5,943,000 50,911,000 16,885,000 17,812,000 13,622,000 38,461,000 (1,373,000) 3,781,000 91,551,000 54,491,000 57,298,000
Texas-New Mexico Power Company [Member]
                      
Segment Reporting Information [Line Items]                      
Operating revenues 62,736,000 68,680,000 63,766,000 54,958,000 57,076,000 66,983,000 59,957,000 53,842,000 250,140,000 237,858,000 212,588,000
Operating income 15,862,000 20,970,000 18,897,000 11,791,000 14,872,000 21,551,000 13,695,000 13,724,000 67,520,000 63,842,000 56,411,000
Net Earnings (Loss) Attributable to PNMR 6,634,000 9,084,000 8,018,000 3,011,000 5,124,000 8,868,000 4,102,000 4,163,000 26,747,000 22,257,000 15,982,000
First Choice [Member]
                      
Net Earnings (Loss) Attributable to PNMR per Common Share:                      
Gain on sale of business segment 174,900,000               174,900,000    
Gain on sale of business segment, net of tax $ 97,000,000                    
[1] During the fourth quarter of 2011, PNMR completed the sale of First Choice which resulted in a $174.9 million ($97.0 million after-tax) gain, that positively affected net earnings, net earnings attributable to PNMR, and earnings per share. See Note 3.