0000886128 2026-07-08 2026-07-08 0000886128 1 2026-07-08 2026-07-08 iso4217:USD pure shares S-3 424B5 EX-FILING FEES 333-296607 0000886128 FUELCELL ENERGY INC N/A N/A S-3 FUELCELL ENERGY INC false Equity Common Stock, par value $0.0001 per share true 12321429 21.00 258750009.00 0.0001381 35733.38 258750009.00 35733.38 0.00 0.00 35733.38 The prospectus supplement to which this Exhibit is attached is a final prospectus for the related offering. The registration fee is calculated in accordance with Rule 457(o) and 457(r) under the Securities Act of 1933, as amended (the "Securities Act"). Payment of the registration fee at the time of filing of the registrant's Registration Statement on Form S-3ASR (Registration No. 333-296607), filed with the Securities and Exchange Commission on June 8, 2026, was deferred pursuant to Rules 456(b) and 457(r) under the Securities Act and is paid herewith. The amount registered includes up to 1,607,143 shares of Common Stock, par value $0.0001 per share, that the underwriters have an option to purchase. 258750009.00 true