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

Fort Collins, Colorado (April 2, 2002)—Advanced Energy Industries (Nasdaq: AEIS) announced today that it now has ownership of Symphony Systems’ technology as part of a settlement of Advanced Energy’s secured claims on the technology. Symphony effectively ceased operations in February 2002. In addition to obtaining Symphony’s technology and related assets, Advanced Energy has hired Symphony’s key employees.

Symphony’s technology includes the Equipment Productivity Manager (EPMÔ), a network-based, open-architecture software solution for the semiconductor and semiconductor equipment industries. Symphony’s EPM(tm) suite is a comprehensive offering that provides network connectivity, web-based automated data collection, a high-performance, real-time database for time-series parametric data, and data analysis application.

With installations at leading OEMs, top-tier fabs, and applications partners, the Symphony system has proven itself as a leading tool connectivity and data management solution for applications such as tool health monitoring, e-diagnostics, and advanced process control. Advanced Energy will leverage the Symphony product line within the emerging equipment productivity software space, as well as use it to broaden Advanced Energy 's own application product line and improve time to market of application offerings.

“Symphony’s technology is an important part of our Convergent Technologies strategy of providing customers with integrated solutions to maximize production efficiency and equipment value,” said Doug Schatz, chairman and chief executive officer of Advanced Energy. “Our customers have been particularly pleased with the ease and speed with which the Symphony system connects to new tools. They have also been impressed with the architecture and scalability of the system,” added Mr. Schatz.

About Advanced Energy
Advanced Energy is a global leader in the development, marketing and support of components and sub-systems critical to plasma-based manufacturing processes used in the production of semiconductors, flat panel displays, data storage products, compact discs, digital video discs, architectural glass, and other applications that require precise thin-film processes.

AE offers a comprehensive line of technology solutions in power, flow and thermal management, plasma and ion beam sources, and integrated process monitoring and control to 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, please visit our corporate website: www.advanced-energy.com. For more information about Symphony Systems, please visit www.symphony-systems.com.

Safe Harbor Statement
This press release contains forward-looking statements within the meaning of the Private Securities Litigation Reform Act of 1995. These forward-looking statements represent the companies' reasonable judgments with respect to future events, but are subject to risks and uncertainties that could cause actual results to differ materially from those described in the forward-looking statements, including the possibility that the projections on which the companies relied to determine the advisability of the asset acquisition ultimately might not prove to have been accurate. The company is susceptible to fluctuations in quarterly and annual revenues and operating results and the volatility and cyclicality of the semiconductor and semiconductor capital equipment industries. These and other cautionary statements are discussed in Advanced Energy's SEC reports, including its Forms 10-Q and most recent annual report on Form 10-K, which are available from the SEC at www.sec.gov or Advanced Energy at 1625 Sharp Point Drive, Fort Collins, Colorado, 80525; 970-221-4670. Advanced Energy assumes no obligation to update the information in this press release.