X0306 4 2021-04-15 0 0000886128 FUELCELL ENERGY INC FCEL 0001437823 England James Herbert 3 GREAT PASTURE ROAD DANBURY CT 06810 1 0 0 0 Deferred Common Stock Units 2021-04-15 4 A 0 2664 0 A Common Stock 2664 97747 D Represents director retainer and committee fees paid in stock pursuant to the FuelCell Energy, Inc. 2021 Director Compensation Program. As such fees are being deferred pursuant to the FuelCell Energy, Inc. Directors Deferred Compensation Plan, deferred common stock units are being issued to the reporting person. In accordance with elections made by the reporting person under the Directors Deferred Compensation Plan, the shares of common stock underlying the common stock units are payable to the reporting person, on a one-for-one basis (i.e., one share of common stock for each common stock unit), upon separation from service as a director. Balance includes the April 8, 2021 vesting of restricted stock units previously awarded and reported, which the reporting person has elected to defer, as well as all other previously vested restricted stock units and common stock that the reporting person has elected to defer. /s/ Jacqueline Perez-Ares, As Power of Attorney 2021-04-19