Senior management of Sierra Pacific Resources (NYSE: SRP) will review the company's first quarter 2004 financial results, regulatory issues and other matters during a conference call and live webcast on Tuesday, May 11, at 7 a.m. Pacific Standard Time. Interested parties can access the webcast with the following link:

http://event.on24.com/clients/srp/6391.html

The webcast will also be accessible on the Sierra Pacific Resources web site at:

http://www.sierrapacificresources.com/investors/news/

An archived version of the webcast will remain on the Sierra Pacific Resources web site for approximately one month following the live webcast. To listen to a recording of the call by telephone, call 1-888-266-2081 and use the conference call ID number, 458690, to access the recording.

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.

Audio: http://event.on24.com/clients/srp/6391.html

SOURCE: Sierra Pacific Resources

CONTACT: Karl Walquist of Sierra Pacific Resources, +1-775-834-3891