Media Contact:
Adam Grant, 702-367-5222
Analyst Contact:
Britta Carlson, 702-367-5624

Las Vegas, Nev -- Sierra Pacific Resources (NYSE:SRP) 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 renewable energy resources.

Proposals will be considered for the following types of renewable energy resources: solar, wind, geothermal, biomass and other resources eligible for portfolio energy credits under the Nevada renewable portfolio standard. Responses to the RFP are due back by November 13, 2007.

"Renewable resources are an integral part of our energy supply strategy,"said Tom Fair, renewable energy executive, Sierra Pacific Resources."We are currently involved in more than 30 renewable energy projects in Nevada and we want to increase that number significantly."

This request is consistent with the companies'ongoing plan to be ahead of the goals of legislation that requires an increasing percentage of the electricity provided by Nevada Power Company and Sierra Pacific Power Company to come from renewable sources. The current standard calls for 20 percent of all the companies'energy to come from renewable resources or energy efficiency measures by 2015.

Parties interested in submitting a response to the RFP, or those seeking more information related to the RFP or renewable energy laws, should go to Sierra Pacific Resources'websites at:

http://www.nevadapower.com/company/RFPs/renewable

http://www.sierrapacific.com/company/RFPs/renewable

The companies have also set up an RFP email address,RenewablesRFP@nevadapower.com, for distribution of information related to the RFP and to allow uniform communication to all Respondents during the RFP process.

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.