July 22, 2008

Orion Energy Systems Sets Conference Call and Webcast for First Quarter Fiscal 2009 Financial Results

MANITOWOC, Wis., July 22, 2008 (PRIME NEWSWIRE) -- Orion Energy Systems, Inc. (Nasdaq:OESX), a leading energy management company announced today that it will hold its quarterly results conference call for investors and analysts on Tuesday, August 5 at 4:30 p.m. Central. Orion's Chief Executive Officer, Neal Verfuerth, Chief Financial Officer, Scott Jensen and Chief Operating Officer, Erik Birkerts will host the conference call. The details of the webcast and conference call are as follows:

   Date:  Tuesday, August 5, 2008   Time:  4:30 p.m. Central   Access by conference call:  Domestic callers:  Dial 877-419-6592  International callers:  Dial 719-325-4864 

Access by webcast:

Go to the Investor Relations section of Orion Energy Systems website at http://investor.oriones.com/events.cfm for a live webcast link. To ensure a timely connection, it is recommended that users register at least 15 minutes prior to the scheduled webcast.

An audio replay of the earnings conference call will be available shortly after the call and will remain available through Thursday, August 14, 2008. The replay can be accessed by dialing 888-203-1112. International callers should dial 719-457-0820. The replay passcode for all callers is 2980145.

Orion Energy Systems, Inc. (Nasdaq:OESX) is a leading power technology enterprise that designs, manufactures and implements energy management systems, consisting primarily of high-performance, energy efficient lighting systems and controls and related services, for commercial and industrial customers without compromising their quantity or quality of light.

The Orion Energy Systems, Inc. logo is available at http://www.primenewswire.com/newsroom/prs/?pkgid=4540

This news release was distributed by PrimeNewswire, www.primenewswire.com

 CONTACT:  Orion Energy Systems           Erik G. Birkerts           (920) 482-1924            FD Ashton Partners           Victoria Paris           (312) 553-6715