MANITOWOC, Wis., Mar 20, 2008 (PrimeNewswire via COMTEX News Network) -- Orion Energy Systems Inc. (Nasdaq:OESX) is pleased to announce that as of March 24, 2008 the company will be added to the NASDAQ(r) Clean Edge(r) U.S. Index (Nasdaq:CLEN) and the NASDAQ(r) Clean Edge(r) U.S. Liquid Series Index (Nasdaq:CELS).

"We are extremely pleased that Orion Energy has been added to the NASDAQ Clean Edge Indexes," stated Neal Verfuerth, Orion's president and CEO. "Having a respected third party such as NASDAQ recognize our focus and commitment to clean energy initiatives further validates our thought leadership in this sector."

The NASDAQ(r) Clean Edge(r) U.S. Index (Nasdaq:CLEN) and the NASDAQ(r) Clean Edge(r) U.S. Liquid Series Index (Nasdaq:CELS) are designed to track the performance of clean-energy companies that are publicly traded in the U.S. The Indexes include companies engaged in the manufacturing, development, distribution, and installation of emerging clean-energy technologies such as solar photovoltaics, biofuels and advanced batteries. The five major sub-sectors that the index covers are Renewable Electricity Generation, Renewable Fuels, Energy Storage & Conversion, Energy Intelligence and Advanced Energy-Related Materials. The securities must also meet other eligibility criteria, which include minimum requirements for market value, average daily share volume, and price. For more information about the NASDAQ Clean Edge U.S. Index and the NASDAQ Clean Edge U.S. Liquid Series Index, including detailed eligibility criteria, visit http://www.NASDAQ.com.

Since 2001, Orion technology has displaced over 303 megawatts, saving customers over $304 million, and reducing indirect CO2 emissions by over 3.8 million tons.

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. For more information, visit www.oriones.com.

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

SOURCE: Orion Energy Systems, Inc.

Orion Energy Systems Inc.
          Media Contact:
          Linda Diedrich, Director Corporate Communications
          920-482-1988
          ljd@oes1.com

          Market Street Partners
          Investor Relations Contact:
          JoAnn Horne
          415-445-3233
          joann@marketstreetpartners.com

(C) Copyright 2008 PrimeNewswire, Inc. All rights reserved.

News Provided by COMTEX