Senior management of Sierra Pacific Resources (NYSE: SRP) will review the company's 2006 second quarter financial results, regulatory issues and other matters during a conference call and webcast on Friday, July 28, at 7 a.m. Pacific Daylight Time.

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

www.sierrapacificresources.com

An archived version of the webcast will remain on the Sierra Pacific Resources web site for approximately one month following the live webcast.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 (800) 475-6701 and use the conference call access code, 834510, to listen to the recording. International callers should dial (320) 365-3844.

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.

SOURCE: Sierra Pacific Resources

CONTACT: Media, Karl Walquist, +1-775-834-3891, or Analysts, Britta
Carlson, +1-702-367-5624, both of Sierra Pacific Resources

Web site: http://www.sierrapacificresources.com/