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Lawrence D. Firestone
Advanced Energy Industries, Inc.
Annie Leschin/Brooke Deterline
Advanced Energy Industries, Inc.

Edward C. Grady is Elected to Advanced Energy Board of Directors

FORT COLLINS, Colo., May 12, 2008
—Advanced Energy Industries, Inc. (Nasdaq: AEIS) today announced that Edward C. Grady was elected by the stockholders as a new director on May 7, 2008. Mr. Grady currently serves on the Board of Directors of Evergreen Solar, Inc., a developer and manufacturer of solar panels and other solar energy products; Verigy Ltd., a provider of automated test systems for the semiconductor industry; and Electro Scientific Industries, Inc., a supplier of production equipment for micro-engineering applications.

Hans Betz, president and chief executive officer of Advanced Energy, said, "We are pleased to welcome Ed to our Board. His extensive experience in our markets, particularly the solar market, will benefit Advanced Energy as we continue to grow."

Mr. Grady was the president and chief executive officer of Brooks Automation, Inc., a leading worldwide provider of automation solutions to the global semiconductor and related industries, until his retirement October 2007, and continues to serve as a senior executive consultant. Prior to joining Brooks he was a partner at Propel Partners, a venture firm in Palo Alto, California. Prior to this he ran several divisions at KLA-Tencor and helped to grow the business to a level in excess of $1 billion in revenues. Before KLA-Tencor, he served as president and CEO of Hoya Micro Mask for three years. He started his career as an engineer for Monsanto/MEMC, and during his 13 years with the company, rose to the position of vice president of worldwide sales for EPI, the most profitable division in MEMC.

About Advanced Energy
Advanced Energy® develops innovative power and control technologies that enable high-growth, plasma thin-film manufacturing processes worldwide, including semiconductors, flat panel displays, data storage products, solar cells, architectural glass, and other advanced product applications. Advanced Energy® also develops grid connect inverters for the solar energy market.