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Sierra Pacific Resources (NYSE: SRP) announced today that its two wholly-owned subsidiaries, Nevada Power Company and Sierra Pacific Power Company have successfully amended their existing revolving credit facilities, increasing the amount of each credit facility by $100 million.

These amended facilities consist of a $600 million revolving facility for Nevada Power and a $350 million revolving facility for Sierra Pacific Power, both to mature in November 2010. The facilities will be used for general corporate purposes, including increasing the companies'liquidity to cover increased commodity prices.

Wachovia Bank, National Association, serves as the administrative agent for both credit facilities.

Headquartered in Nevada, Sierra Pacific Resources is a holding company whose principal subsidiaries are Nevada Power Company, the electric utility for most of southern Nevada, and Sierra Pacific Power Company, the electric utility for most of northern Nevada and the Lake Tahoe area of California. Sierra Pacific Power Company also distributes natural gas in the Reno-Sparks area of northern Nevada. Other subsidiaries include the Tuscarora Gas Pipeline Company, which owns 50 percent interest in an interstate natural gas transmission partnership and several unregulated energy services companies.