你的投票很重要！ *請查看會議材料，瞭解對會議出席的任何特殊要求。 智能手機用户 將你的攝像頭對準這裏， 無需輸入 控制號碼即可投票 要獲得完整信息並進行投票，請訪問 www.proxyvote.com Control # V29908-P02635 FUELCELL ENERGY, INC. 2024 年年會 在美國東部時間 2024 年 4 月 3 日晚上 11:59 之前投票 你投資了 FUELCELL ENERGY, INC.，現在是時候投票了！ 您有權對年會上提出的提案進行投票。這是關於將於2024年4月4日舉行的股東大會的 代理材料可用性的重要通知。 在會議上進行虛擬投票* 美國東部夏令時間2024年4月4日下午1點 虛擬地址為： www.virtualSharealdermeeting.com/fcel2024 在投票前獲取信息 在線查看通知、委託書和年度報告，或者您可以在 2024 年 3 月 21 日之前申請 免費獲得材料的紙質或電子郵件副本。如果你想索取本次和/或未來股東 會議的材料副本，你可以（1）訪問www.proxyVote.com，（2）致電1-800-579-1639或（3）發送電子郵件至 sendmaterial@proxyvote.com。 如果發送電子郵件，請在主題行中註明您的控制號碼（如下所示）。除非您提出要求，否則您不會 以其他方式收到紙質或電子郵件副本。 FUELCELL ENERGY, INC. 3 GREAT PASTURE ROAD 康涅狄格州丹伯裏 06810 收件人：公司祕書

Vote at www.ProxyVote.com Prefer to receive an email instead? While voting on www.ProxyVote.com, be sure to click “Delivery Settings”. Voting Items Board Recommends V29909-P02635 THIS IS NOT A VOTABLE BALLOT This is an overview of the proposals being presented at the upcoming stockholder meeting. You cannot use this notice to vote these shares. This communication presents only an overview of the more complete proxy materials that are available to you on the Internet. You may view the proxy materials online at www.proxyvote.com or easily request a paper copy (see reverse side). We encourage you to access and review all of the important information contained in the proxy materials before voting. 1. To elect seven directors to serve until the 2025 Annual Meeting of Stockholders and until their successors are duly elected and qualified Nominees: 1a. James H. England For 1b. Jason Few For 1c. Matthew F. Hilzinger For 1d. Natica von Althann For 1e. Cynthia Hansen For 1f. Donna Sims Wilson For 1g. Betsy Bingham For 2. To ratify the selection of KPMG LLP as FuelCell Energy, Inc.’s independent registered public accounting firm for the fiscal year ending October 31, 2024 For 3. To approve the amendment and restatement of the FuelCell Energy, Inc. Third Amended and Restated 2018 Omnibus Incentive Plan For 4. To approve, on a non-binding advisory basis, the compensation of FuelCell Energy, Inc.’s named executive officers as set forth in the “Executive Compensation” section of the Proxy Statement For NOTE: To transact such other business as may properly come before the Annual Meeting or any adjournment thereof.