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Condensed Consolidated Balance Sheets (Parenthetical) (USD $)
In Thousands, except Share data
Sep. 30, 2011
Dec. 31, 2010
Allowance for uncollectible accounts$ 1,645$ 11,178
Accumulated depreciation, non-utility property1252,307
Accumulated depreciation, nuclear fuel36,72226,247
Accumulated depreciation, other intangible assets05,414
Cumulative preferred stock of subsidiary, stated value$ 100.00$ 100.00
Cumulative preferred stock of subsidiary, shares authorized115,293115,293
Cumulative preferred stock of subsidiary, shares authorized10,000,00010,000,000
Cumulative preferred stock of subsidiary, shares issued115,293115,293
Convertible preferred stock, stated value$ 0.00$ 0.00
Convertible preferred stock, shares authorized10,000,00010,000,000
Convertible preferred stock, shares issued0477,800
Convertible preferred stock, shares outstanding0477,800
Common stock, par value$ 0.00$ 0.00
Common stock, shares authorized120,000,000120,000,000
Common stock, shares issued86,673,17486,673,174
Common stock, shares outstanding86,673,17486,673,174
Public Service Company of New Mexico [Member]
  
Allowance for uncollectible accounts1,6451,483
Accumulated depreciation, nuclear fuel$ 36,722$ 26,247
Cumulative preferred stock of subsidiary, stated value$ 100$ 100
Cumulative preferred stock of subsidiary, shares authorized10,000,00010,000,000
Common stock, par value$ 0$ 0
Common stock, shares authorized40,000,00040,000,000
Common stock, shares issued39,117,79939,117,799
Common stock, shares outstanding39,117,79939,117,799
Cumulative preferred stock of subsidiary, shares issued115,293115,293
Cumulative preferred stock of subsidiary, shares outstanding115,293115,293
Texas-New Mexico Power Company [Member]
  
Common stock, shares authorized12,000,00012,000,000
Common stock, shares issued6,3586,358
Common stock, shares outstanding6,3586,358
Common stock, par value$ 10$ 10