For more information, contact:

Mike El-Hillow
Advanced Energy Industries, Inc.
970.407.6570
Cathy Kawakami,
Advanced Energy Industries, Inc.
970.407.6732
cathy.kawakami@aei.com

Advanced Energy Appoints Dr. Barry Z. Posner to the Board of Directors
FORT COLLINS, Colo., Aug 17, 2004—Advanced Energy (Nasdaq: AEIS) today announced the appointment of Dr. Barry Z. Posner, 55, to the Board of Directors. Dr. Posner is Dean of the Leavey School of Business at Santa Clara University, a professor of leadership, and an award-winning author.

(Logo: http://www.newscom.com/cgi-bin/prnh/20030825/AEISLOGO)

Doug Schatz, chairman and chief executive officer of Advanced Energy, said, "Barry's research and expertise in the field of leadership and organizational behavior is well-respected by management teams worldwide. He has created a leadership model for a world-class organizational approach to long-term opportunities and challenges. We look forward to his contributions as a director on our board."

Dr. Posner is the co-author of four award-winning leadership books, including The Leadership Challenge: How to Keep Getting Extraordinary Things Done in Organizations. Dr. Posner, along with his co-author Jim Kouzes, received the International Management Council's award as the nation's top management and leadership educators. Dr. Posner is currently on the editorial review boards of the Journal of Business Ethics and Leadership Review, and section editor for the Journal of Management Inquiry. Dr. Posner also conducts leadership-based workshops for corporations around the world.

About Advanced Energy

Advanced Energy is a global leader in the development and support of technologies critical to high-technology manufacturing processes used in the production of semiconductors, flat panel displays, data storage products, compact discs, digital video discs, architectural glass, and other advanced product applications.

Leveraging a diverse product portfolio and technology leadership, Advanced Energy creates solutions that maximize process impact, improve productivity and lower cost of ownership for its customers. This portfolio includes a comprehensive line of technology solutions in power, flow, thermal control and plasma and ion beam sources, for original equipment manufacturers (OEMs) and end-users around the world.

Advanced Energy 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, Advanced Energy is a publicly held company traded on the Nasdaq National Market under the symbol AEIS. For more information, please visit our corporate website: www.advanced-energy.com.