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ASSETS HELD FOR SALE	9 Months Ended
ASSETS HELD FOR SALE	Sep. 30, 2011
ASSETS HELD FOR SALE [Abstract]
ASSETS HELD FOR SALE	NOTE 10. ASSETS HELD FOR SALE Nevada Power Company Sale of NPC's Telecommunication Towers In August 2011, NPC completed the sale of 37 telecommunication towers to Global Tower Partners, LLC. Cash proceeds from the sale were approximately $32 million with the gain on sale deferred subject to the final accounting approval by the PUCN. Sierra Pacific Power Company Sale of California Electric Distribution and Generation Assets On January 1, 2011, SPPC completed the sale of its California electric distribution and generation assets to CalPeco, d/b/a Liberty Energy-CalPeco. Cash proceeds from the sale were approximately $132 million, plus additional closing adjustments, resulting in an immaterial after tax gain, for which the final accounting was approved by the FERC in September 2011. Refer to Note 16, Assets Held for Sale, of the Notes to Financial Statements of the 2010 Form 10-K for more information.