For more information, contact:

Chris Fergen Tower Electronics 970.407.6208

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

Voorhees, New Jersey (November 29, 2000)—A new series of literature describing high-performance, switching ac-to-dc custom power supplies for critical system power is now available from Tower Electronics, an Advanced Energy Industries, Inc. company (NASDAQ NM: AEIS). Tower's unique, proprietary designs solve many problems that off-the-shelf power supplies cannot address. Because of the high feature-set of these power supplies, up-front engineering support is a hallmark of Tower's offerings.

This comprehensive set of literature describes power supplies for a variety of mission-critical system applications including:

• Semiconductor
• Industrial laser
• Industrial motor control
• Other industrial
• Medical laser
• Other medical
• Telecommunications

Copies of the literature describing Tower's power supplies are available at no charge by sending a request via e-mail to sales.support@aei.com.

Advanced Energy is a global leader in the development, marketing, and support of integrated technology solutions that are central in the manufacture of semiconductors, data storage products, and flat panel displays as well as other mission-critical power applications. Original equipment manufacturers 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 key subsystems for vacuum process systems including power conversion and control solutions, process monitoring and machine control tools, ion-beam sources, dynamic temperature control and measurement products, 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.