FuelCell Energy Inc (FuelCell Energy) is a company headquartered in Danbury, Connecticut, that specializes in delivering clean energy solutions. The company focuses on producing clean electricity, heat, hydrogen, and water through its commercial technologies. FuelCell Energy is also involved in carbon capture technology, aiming to address global emissions objectives. The company serves various industries, including utilities, data centers, wastewater treatment, commercial and hospitality, food and beverage, and microgrids, primarily in the US, Europe, and Korea.

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FuelCell Energy is engaged in various R&D initiatives focused on the development and commercialization of solid oxide fuel cells, distributed hydrogen, and carbon capture technologies. The company is working on improving its core carbonate and solid oxide cell module capabilities, enhancing product performance, and extending the design life and output of its modules. Additionally, FuelCell Energy is investing in the commercialization of patented technologies such as carbon capture and separation, solid oxide fuel cells, and solid oxide electrolysis cells for hydrogen production and energy storage. The company is also developing a module design to enhance competitiveness in large-scale infrastructure projects. The R&D unit of FuelCell Energy is responsible for advancing the company's core carbonate and solid oxide cell module capabilities, supporting commercial fleet enhancements, and implementing product improvements. The unit also focuses on the development and commercialization of patented technologies and module designs for large-scale projects. FuelCell Energy operates a manufacturing facility in Torrington, Connecticut, which also serves as a global service center. The company holds 148 U.S. patents and 307 patents in other jurisdictions, with 28 patent applications pending in the U.S. and 86 in other jurisdictions. The company collaborates with various U.S. government departments and agencies, as well as private companies like Canadian Natural Resources, Drax Group, and ExxonMobil Technology and Engineering Company. In FY2024, the company spent US$55.4 million on its R&D activities, which as a percentage of revenue, stood at 49.4% and decreased 9.2% YoY.