Orion Energy Systems, Inc. Files Registration Statement for Proposed Initial Public Offering of Common Stock

Daniel J. Waibel

[email protected]

Plymouth, WI – August 20, 2007 – Orion Energy Systems, Inc. announced today that it has filed a registration statement on Form S­1 with the Securities and Exchange Commission relating to a proposed initial public offering of shares of its common stock. Orion Energy Systems, Inc. and certain selling shareholders are selling the shares of common stock proposed to be sold in this offering.

A registration statement relating to these securities has been filed with the Securities and Exchange Commission but has not yet become effective. These securities may not be sold nor may offers to buy be accepted prior to the time the registration statement becomes effective. This press release shall not constitute an offer to sell or the solicitation of an offer to buy, nor shall there be any sale of these securities in any state in which such offer, solicitation or sale would be unlawful prior to registration or qualification under the securities laws of such state.

Thomas Weisel Partners LLC is acting as the sole book-running manager for the offering and Canaccord Adams Inc. and Pacific Growth Equities, LLC are acting as co-managers for the offering. When available, copies of the preliminary prospectus relating to the offering may be obtained from Thomas Weisel Partners LLC, Attention: Prospectus Department, One Montgomery Street, Suite 3700, San Francisco, California 94104, or by calling (415) 364-2720.