Media Contact: Sonya Headen (702) 367-5222

Las Vegas, NV. -- Sierra Pacific Resources (NYSE:SRP) has announced today that its two Nevada-based utility subsidiaries, Nevada Power Company and Sierra Pacific Power Company, have issued a Request for Proposals (RFP) for energy and credits generated by renewable energy fuel sources.

The request is part of the utilities'actions to comply with Nevada law which requires Nevada utilities to generate or acquire a certain percentage of renewable energy resources, including solar, wind, geothermal, biomass and hydro sources, for use in serving customers within the state. Responses to the RFP are due back to the utilities no later than June 20, 2005.
Sierra Pacific Resources is seeking renewable projects proposals totaling approximately 200 megawatts of wind, geothermal, hydro, biomass, reverse polymerization and biogas, and 70 megawatts of solar.

The law contains a provision that requires providers of electric service to increase the use of renewable energy by two percent every other year, until the provider's renewable energy portfolio accounts for 15 percent of its total energy sales by the year 2013. The total for solar- generated power must be at least five percent of the total renewable energy portfolio.
Parties interested in submitting a response or additional information related to the RFP and renewable energy laws are encouraged to visit the companies' websites. 

http://www.sierrapacific.com/company/renewables/ 
http://www.nevadapower.com/company/RFPs/renewablesrfp.cfm

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.