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CAPSTONE TURBINE CORPORATION

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NNNNNNNNNNNN . + CN12N345N678N90 NN CAPSTONE TURBINE CORPORATION 000004 ENDORSEMENT_LINE______________ SACKPACK_____________ MR A SAMPLE DESIGNATION (IF ANY) ADD 1 ADD 2 ADD 3 ADD 4 ADD 5 ADD 6 Vote by Internet • Go to www.envisionreports.com/CPST • Or scan the QR code with your smartphone • Follow the steps outlined on the secure website Important Notice Regarding the Availability of Proxy Materials for the Capstone Turbine Corporation Annual Meeting of Stockholders to be Held on August 31, 2016 Under Securities and Exchange Commission rules, you are receiving this notice that the proxy materials for the Capstone Turbine Corporation annual meeting of stockholders are available on the Internet. Follow the instructions below to view the materials and vote online or request a copy. The items to be voted on and location of the annual meeting are on the reverse side. Your vote is important! This communication is not a form for voting and 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. Capstone Turbine Corporation’s proxy statement and annual report to stockholders are available at: www.envisionreports.com/CPST Easy Online Access — A Convenient Way to View Proxy Materials and Vote When you go online to view materials, you can also vote your shares. Step 1: Go to www.envisionreports.com/CPST to view the materials. Step 2: Click on Cast Your Vote or Request Materials. Step 3: Follow the instructions on the screen to log in. Step 4: Make your selection as instructed on each screen to select delivery preferences and vote. Q When you go online, you can also help the environment by consenting to receive electronic delivery of future materials. Obtaining a Copy of the Proxy Materials – If you want to receive a copy of these documents, you must request one. There is no charge to you for requesting a copy. Please make your request for a copy as instructed on the reverse side on or before August 19, 2016 to facilitate timely delivery. + C O Y 02E2RB NNNNNNNNN Stockholder Meeting Notice1234 5678 9012 345 IMPORTANT ANNUAL MEETING INFORMATION

. Capstone Turbine Corporation’s Annual Meeting of Stockholders will be held on August 31, 2016 at Capstone’s corporate offices located at 21211 Nordhoff Street, Chatsworth, California 91311, at 10:00 a.m. Pacific Time. Proposals to be voted on at the meeting are listed below along with the Board of Directors’ recommendations. The Board of Directors recommends that you vote FOR the following proposals: 1. Election of Directors Nominees 01 Gary D. Simon 06 Gary J. Mayo 02 Richard K. Atkinson 07 Eliot G. Protsch 03 Paul DeWeese 08 Holly A. Van Deursen 04 Darren R. Jamison 05 Noam Lotan 2. 3. Advisory vote on the compensation of Capstone’s named executive officers as presented in the proxy statement; Ratification of the selection of KPMG LLP as Capstone’s independent registered public accounting firm for the fiscal year ending March 31, 2017; and In their discretion, the proxies may vote upon any and all other matters as may properly come before the meeting or any adjournment or postponement thereof. 4. PLEASE NOTE – YOU CANNOT VOTE BY RETURNING THIS NOTICE. To vote your shares you must vote online or request a paper copy of the proxy materials to receive a proxy card. If you wish to attend and vote at the meeting, please bring this notice with you. Directions to Capstone Turbine Corporation 2016 Annual Meeting Information on how to obtain directions to the Capstone Turbine Corporation 2016 Annual Meeting of Stockholders are available in the proxy statement which can be viewed at www.proxyvoting.com/cpst Here’s how to order a copy of the proxy materials and select a future delivery preference: Paper copies: Current and future paper delivery requests can be submitted via the telephone, Internet or email options below. Email copies: Current and future email delivery requests must be submitted via the Internet following the instructions below. If you request an email copy of current materials you will receive an email with a link to the materials. PLEASE NOTE: You must use the number in the shaded bar on the reverse side when requesting a set of proxy materials. g Internet – Go to www.envisionreports.com/CPST. Click Cast Your Vote or Request Materials. Follow the instructions to log in and order a copy of the current meeting materials and submit your preference for email or paper delivery of future meeting materials. Telephone – Call us free of charge at 1-866-641-4276 and follow the instructions to log in and order a paper copy of the materials by mail for the current meeting. You can also submit a preference to receive a paper copy for future meetings. Email – Send email to investorvote@computershare.com with “Proxy Materials Capstone Turbine Corporation” in the subject line. Include in the message your full name and address, plus the number located in the shaded bar on the reverse, and state in the email that you want a paper copy of current meeting materials. You can also state your preference to receive a paper copy for future meetings. To facilitate timely delivery, all requests for a paper copy of the proxy materials must be received by August 19, 2016. g g 02E2RB Stockholder Meeting Notice