For more information, contact:

Jim Donaldson Advanced Energy Industries, Inc. 970.407.6374

Marna Shillman Advanced Energy Industries, Inc. 970.407.6280 marna.shillman@aei.com

Tokyo, Japan, Dec. 3, 2001—Advanced Energy Industries, Inc. (Nasdaq: AEIS) today announced that it has launched a new Japanese language website to optimize accessibility for its customers in Japan. The new, user-friendly website will enable Japanese customers to easily access company and product information in their native language. While it was originally scheduled to go live early next year, Advanced Energy and Advanced Energy Japan, a subsidiary of the parent company, expedited their efforts to develop the website as an effective regional support tool to meet the growing customer needs. The Japanese language website is located on the World Wide Web at www.advanced-energy.co.jp and is cross-linked with Advanced Energy’s corporate website at www.advanced-energy.com.

“Accessing information is a critical component of doing business in the global environment. We are glad that our Japanese customers, which represent an increasing market for Advanced Energy, can access information on our products and company 24 hours a day,” noted Doug Schatz chairman, CEO and president of Advanced Energy.

“We have modeled our Japanese website after Advanced Energy’s corporate website, so that it will provide a valuable resource center for our local Japanese customers,” stated Shunsuke Sugao president of Advanced Energy Industries KK. “It is becoming increasingly important that we provide a real-time and interactive method of communication with our customers here in Japan.”

The web page includes the following sections in Japanese language:

• Corporate information—Company history, locations and product overviews
• Link to Advanced Energy’s corporate website
• Product information—Power management, ion sources, thermal management, gas delivery management and connectivity products
• News—AE Japanese-specific news and events
• Company contacts—AE Japan office contacts as well as distributors and representatives

About Advanced Energy
Advanced Energy is a global leader in the development, marketing and support of technology solutions that are central in the manufacture of semiconductors, data storage products and flat panel displays. Original equipment manufacturers (OEMs) and end-users around the world depend on AE products when plasma-based technology plays a vital role in their manufacturing process. AE offers a comprehensive suite of products for vacuum process systems, including power management, temperature sensing, dynamic temperature control, gas delivery management, process monitoring and machine control tools, ion-beam sources, and plasma abatement technologies. AE technology solutions are sold and supported globally by direct offices, representatives and distributors. Founded in 1981, AE is a publicly held company traded on Nasdaq under the symbol AEIS. AE’s URL is www.advanced-energy.com.