For more information, contact:

Thomas M. Rohrs Elected to Advanced Energy Board of Directors

FORT COLLINS, Colo., May 26, 2006—Advanced Energy Industries, Inc. (Nasdaq: AEIS) today announced that Thomas M. Rohrs was elected by the stockholders as a new director on May 24, 2006. Mr. Rohrs is currently chairman and chief executive officer of Electroglas, Inc., a supplier of wafer probing technologies to the semiconductor industry, a position he has held since April 7, 2006.

Hans Betz, president and chief executive officer of Advanced Energy, said, “Tom has a deep understanding of our industry as well as extensive experience in global manufacturing operations, specifically in Asia, after nearly thirty years in the high technology sector. We welcome Tom to the Board, and we look forward to his strategic insight as Advanced Energy continues to differentiate itself in the marketplace with innovative products, world-class manufacturing operations and a strong financial model.”

Mr. Rohrs spent five years with Applied Materials Inc., most recently as senior vice president of global operations, and was a member of its Executive Committee. He also has served as vice president of worldwide operations at Silicon Graphics and as senior vice president of manufacturing and customer service of MIPS Computer Systems. Mr. Rohrs also has worked in various manufacturing and operations positions at Hewlett-Packard Company. He currently serves on the boards of directors of Magma Design Automation, Inc., Ultra Clean Technology and several private companies.

 About Advanced Energy

Advanced Energy is a global leader in innovative power and control technologies that drive high-growth, thin-film and nanotech manufacturing processes worldwide, including semiconductors, flat panel displays, data storage products, solar cells, architectural glass and other advanced product applications.

AE^®’s product portfolio includes precise, flexible power systems; reliable gas and liquid flow-management systems; accurate thermal instruments; and global support services. Leveraging this focused product portfolio and technology leadership, AE creates solutions that maximize process impact, improve productivity, and lower cost of ownership for its customers, including original equipment manufacturers (OEMs) and end-users around the world.

AE operates in regional centers in North America, Asia and Europe and offers global sales and support through direct offices, representatives and distributors. Founded in 1981, AE is a publicly held company traded on Nasdaq National Market under the symbol AEIS. For more information, go to www.advanced-energy.com.