FuelCell Energy Inc (FuelCell Energy) designs, manufactures, installs, operates, and maintains fuel cell distributed power solutions. The company develops and delivers solutions for the supply, recovery, and storage of energy. It serves the utilities and independent power producers, education and health care, data centers and communication, industrial and process applications, commercial and hospitality, wastewater treatment, and government sectors.

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R&D focuses on the development of new products which include SureSource 4000, SureSource 1500, SureSource 250, SureSource 400, SureSource Hydrogen and SureSource 3000. It also strives to increase the net power output of its fuel cell stacks from 350 kW to 375 kW, extending module life and reducing the costs of its products. In FY2023, the company spent US$61 million on its R&D activities which as a percentage of revenue stood at 49.4% and grew 76.7% YoY. As of October 31, 2023, the company had 139 patents in the US and 282 patents in other countries, and 34 pending patent applications in the US and 98 in other jurisdictions.