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Important Notice Regarding the Availability of Proxy Materials for the Shareholder Meeting to be held on May 4, 2010, for Advanced Energy Industries, Inc. This communication presents only an overview of the more complete proxy materials that are available to you on the Internet. We encourage you to access and review all of the important information contained in the proxy materials before voting. To view the proxy statement and annual report, go to www.proxydocs.com/aeis. To submit your proxy while visiting this site, you will need the 12 digit control number in the box below. Under new United States Securities and Exchange Commission rules, proxy materials do not have to be delivered in paper. Proxy materials can be distributed by making them available on the Internet. We have chosen to use these procedures for our 2010 Annual Meeting and need YOUR participation. If you want to receive a paper or e-mail copy of the proxy materials, you must request one. There is no charge to you for requesting a copy. In order to receive a paper package in time for this year’s annual meeting, please make this request on or before April 23, 2010. View Proxy Materials and Annual Report Online at www.proxydocs.com/aeis A convenient way to view proxy materials and VOTE! Material may be requested by one of the following methods: INTERNET TELEPHONE *E-MAIL www.investorelections.com/aeis (866) 648-8133 paper@investorelections.com * If requesting material by e-mail, please send You must use the 12 digit control number a blank e-mail with the 12 digit control number located in the shaded gray box below. (located below) in the subject line. No other requests, instructions or other inquiries should be included with your e-mail requesting material. To view your proxy materials online, go to www.proxydocs.com/aeis. Have the 12 digit control number available when you access the website and follow the instructions. ACCOUNT NO. # SHARES Advanced Energy Industries, Inc. Notice of Annual Meeting Date: Tuesday, May 4, 2010 Time: 10:00 A.M. (Mountain Daylight Time) Place: 1625 Sharp Point Drive, Fort Collins, Colorado 80525 The purpose of the Annual Meeting is to take action on the following proposals: Proposal One – To elect eight Directors. Nominees: Douglas S. Schatz, Frederick A. Ball, Richard P. Beck, Hans Georg Betz, Trung T. Doan, Edward C. Grady, Terry Hudgens and Thomas M. Rohrs Proposal Two – To ratify the appointment of Grant Thornton LLP as Advanced Energy’s independent registered public accounting form for the fiscal year ending December 31, 2010. Proposal Three – Approval of an increase in the number of shares authorized for issuance under the 2008 Omnibus Incentive Plan from 3,500,000 shares to 7,500,000 shares Proposal Four – Approval of an increase in the total number of shares of common stock authorized for issuance under the Employee Stock Purchase Plan from 500,000 shares to 1,000,000 shares The Board of Directors recommends that you vote “FOR” all proposals. Should you require directions to the annual meeting, please call (970) 221-4670 Vote in Person instructions: While we encourage shareholders to vote by the means indicated above, a shareholder is entitled to vote in person at the annual meeting. Additionally, a share holder who has submitted a proxy before the meeting, may revoke that proxy in person at the annual meeting.