NV Energy Announces Reference Yield for Ongoing Cash Tender Offer for Its 6.750% General and Refunding Mortgage Notes, Series P, Due 2037

Sierra Pacific Power Company d/b/a NV Energy ("Sierra Pacific”), a wholly owned subsidiary of NV Energy, Inc. (NYSE: NVE), today announced the final reference yield in connection with the ongoing cash tender offer (the "Tender Offer”) for its 6.750% General and Refunding Mortgage Notes, Series P, due 2037 (the "Notes”) is 4.438%. The reference yield will be used to determine the consideration paid for the Notes that are accepted for purchase after the expiration of the Tender Offer.

The expiration date for the Tender Offer is Midnight, New York City time, December 21, 2009, unless extended or earlier terminated by Sierra Pacific. The early tender date for the Tender Offer expired on December 7, 2009.

The complete terms and conditions of the Tender Offer are set forth in the Offer to Purchase dated November 23, 2009, and in the accompanying Letter of Transmittal that has been sent to holders of the Notes. Holders are urged to read these Tender Offer documents carefully before making any decision with respect to the Tender Offer. Copies of the Offer to Purchase and Letter of Transmittal may be obtained from the Information Agent for the Tender Offer, Global Bondholder Services Corp., at 866-795-2200 (toll-free) or 212-430-3774 (collect).

Goldman, Sachs & Co. is serving as the Dealer Manager for the Tender Offer. Persons with questions regarding the Tender Offer should contact Goldman, Sachs & Co. at 800-828-3182 (toll-free) or 212-357-4692 (collect).

This press release is neither an offer to purchase nor a solicitation to buy any of these Notes nor is it a solicitation for acceptance of the Tender Offer. Sierra Pacific is making the Tender Offer only by, and pursuant to the terms of, the Offer to Purchase and the related Letter of Transmittal. The Tender Offer is not being made in any jurisdiction in which the making or acceptance thereof would not be in compliance with the securities, blue sky or other laws of such jurisdiction. None of Sierra Pacific, the Dealer Manager or the Information Agent makes any recommendation in connection with the Tender Offer.

About Sierra Pacific and NV Energy, Inc.

Sierra Pacific is a regulated public utility engaged in the distribution, transmission, generation, purchase and sale of electric energy and natural gas in northern Nevada. Sierra Pacific provides electricity to approximately 366,000 residential and business customers in a 50,000 square mile service area in western, central and northeastern Nevada, including the cities of Reno, Sparks, Carson City and Elko, and a portion of eastern California, including the Lake Tahoe area. Sierra Pacific also provides natural gas service in Nevada to approximately 149,000 customers in an area of about 600 square miles in Nevada’s Reno/Sparks area. On April 22, 2009, Sierra Pacific entered into an agreement to sell its California electric distribution and generation assets to California Pacific Electric Company. Sierra Pacific’s California electric utility system serves approximately 47,000 retail electric customers in eastern California. Sierra Pacific expects the transaction to close in 2010, following required approvals by the California Public Utility Commission, the PUCN, the FERC, and Hart-Scott-Rodino Antitrust Improvements Act review.

Headquartered in Las Vegas, NV Energy, Inc. is a holding company whose principal subsidiaries, Nevada Power Company and Sierra Pacific Power Company, are doing business as NV Energy. Serving a combined 54,500-square-mile service territory that stretches north to south from Elko to Laughlin, NV Energy provides a wide range of energy services and products to approximately 2.4 million citizens of Nevada as well as approximately 40 million tourists annually.

Forward-Looking Statements Disclosure

This press release may contain forward-looking statements regarding the future performance of Sierra Pacific Power Company d/b/a NV Energy within the meaning of the Private Securities Litigation Reform Act of 1995. These statements are subject to a variety of risks and uncertainties that could cause actual results to differ materially from current expectations. These risks and uncertainties include, but are not limited to, Sierra Pacific Power Company’s continuing ability to borrow under its credit facility to pay for the Notes tendered pursuant to the Tender Offer.

Additional cautionary statements regarding other risk factors that could have an effect on the future performance of Sierra Pacific Power Company are contained in NV Energy Inc.’s and Sierra Pacific Power Company’s Annual Reports on Form 10-K for the year ended December 31, 2008 and Quarterly Reports on Form 10-Q for the quarters ended March 31, 2009, June 30, 2009 and September 30, 2009, both filed with the Securities and Exchange Commission. NV Energy, Inc. and Sierra Pacific Power Company undertake no obligation to release publicly the result of any revisions to these forward-looking statements that may be made to reflect events or circumstances after the date hereof or to reflect the occurrence of unanticipated events.