Sierra Pacific Resources (NYSE: SRP) announced today the final results of its offer to exchange up to 4,704,350 of its Premium Income Equity Securities ("PIES") in the form of Corporate PIES (the "Old PIES") for a like amount of new PIES in the form of Corporate PIES to be issued upon completion of the exchange offer. Additionally, Sierra Pacific Resources will pay an exchange fee of $0.125 in cash for each of the Old PIES tendered in the exchange offer. The exchange offer expired at 5:00 P.M., New York City time (EDT), on May 18, 2005.

Sierra Pacific Resources has been advised by the exchange agent that 1,982,822 Old PIES, or about 41% of the 4,804,350 issued and outstanding Old PIES, had been tendered as of the expiration of the exchange offer, all of which were accepted for exchange by Sierra Pacific Resources. Approximately 2,821,528 Old PIES will remain outstanding after the exchange offer.

The exchange fee for the accepted Old PIES will be delivered promptly to tendering holders by the information agent.

Merrill Lynch, Pierce, Fenner & Smith Incorporated and Lehman Brothers Inc. are the dealer managers for the exchange offer. Morrow & Co., Inc. acted as the information agent for the exchange offer. The Bank of New York is the exchange agent for the exchange offer.

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.

"Premium Income Equity Securities" and "PIES" are service marks owned by Lehman Brothers Inc.

This press release shall not constitute an offer to exchange, sell, or the solicitation of an offer to exchange or buy, the securities of Sierra Pacific Resources, nor shall there be any offer, exchange, solicitation or sale of any securities of Sierra Pacific Resources in any state in which such offer, exchange, solicitation or sale would be unlawful prior to the registration or qualification under the securities law of any such state or jurisdiction.

Certain matters in this press release are forward-looking statements regarding the timing of the exchange offer. Cautionary statements regarding the future performance of Sierra Pacific Resources are contained in its Quarterly Report on Form 10- Q for the period ended March 31, 2005, filed with the SEC.

SOURCE: Sierra Pacific Resources

CONTACT: Media, Andrea Smith, +1-702-367-5843, or Analysts, Britta
Carlson, +1-702-367-5624, both of Sierra Pacific Resources

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