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Condensed Consolidated Balance Sheets (Parenthetical) (USD $)
In Thousands, except Share data
Jun. 30, 2011
Dec. 31, 2010
Allowance for uncollectible accounts $ 9,275 $ 11,178
Accumulated depreciation, non-utility property 2,333 2,307
Accumulated depreciation, nuclear fuel 29,993 26,247
Accumulated depreciation, other intangible assets 5,511 5,414
Cumulative preferred stock of subsidiary, stated value $ 100.00 $ 100.00
Cumulative preferred stock of subsidiary, shares authorized 115,293 115,293
Cumulative preferred stock of subsidiary, shares authorized 10,000,000 50,000
Cumulative preferred stock of subsidiary, shares issued 115,293 115,293
Convertible preferred stock, stated value $ 0.00 $ 0.00
Convertible preferred stock, shares authorized 10,000,000 10,000,000
Convertible preferred stock, shares issued 477,800 477,800
Convertible preferred stock, shares outstanding 477,800 477,800
Common stock, par value $ 0.00 $ 0.00
Common stock, shares authorized 120,000,000 120,000,000
Common stock, shares issued 86,673,174 86,673,174
Common stock, shares outstanding 86,673,174 86,673,174
Public Service Company of New Mexico [Member]
    
Allowance for uncollectible accounts 1,483 1,483
Accumulated depreciation, nuclear fuel $ 29,993 $ 26,247
Cumulative preferred stock of subsidiary, stated value $ 100 $ 100
Cumulative preferred stock of subsidiary, shares authorized 10,000,000 10,000,000
Common stock, par value $ 0 $ 0
Common stock, shares authorized 40,000,000 40,000,000
Common stock, shares issued 39,117,799 39,117,799
Common stock, shares outstanding 39,117,799 39,117,799
Cumulative preferred stock of subsidiary, shares issued 115,293 115,293
Cumulative preferred stock of subsidiary, shares outstanding 115,293 115,293
Texas-New Mexico Power Company [Member]
    
Common stock, shares authorized 12,000,000 12,000,000
Common stock, shares issued 6,358 6,358
Common stock, shares outstanding 6,358 6,358
Common stock, par value $ 10 $ 10