FuelCell Energy (NASDAQ: FCEL) is a clean energy technology company that manufactures and sells stationary molten carbonate fuel cell systems for large-scale, continuous power generation. Founded in 1969 and headquartered in Danbury, Connecticut, FCEL makes money through product sales, long-term service agreements (LTSAs), and power purchase agreements (PPAs) under which it operates, monitors, and maintains fuel cell systems for contracted customers, with service agreements extending through 2042. The company targets utilities, independent power producers, industrial facilities, data centers, universities, healthcare facilities, and government customers. Its carbonate fuel cell platform runs on biofuels, renewable natural gas, and hydrogen-hydrocarbon blends, and produces electricity electrochemically rather than through combustion, delivering ultra-low NOx and SOx emissions along with carbon capture capability. FCEL also conducted development of solid oxide electrolysis technology through its Versa Power subsidiaries, though solid oxide power generation development was ceased as part of restructuring plans announced in November 2024 and June 2025.

Revenue model

Revenue comes from three streams: product sales of molten carbonate fuel cell systems, LTSAs covering scheduled fuel cell module exchanges and maintenance to meet performance guarantees, and PPAs under which FCEL operates plants and sells power directly. LTSAs and PPAs provide recurring contracted revenue with committed production schedules through 2042. Performance shortfalls against guaranteed electrical output or heat rate can trigger module replacements or financial penalties.

Products and services

Proprietary molten carbonate fuel cell systems capable of utility-scale deployments at 10 MW, 20 MW, and 58.8 MW. Systems provide baseload power, carbon capture, and combined heat and power (CHP) including chilling, heating, and process steam. The company also developed solid oxide electrolysis technology through Versa Power Systems subsidiaries; solid oxide power generation development was ceased as of the restructuring plans disclosed in the FY2025 10-K filed 2025-12-18.

Customers and end markets

Primary end markets are utilities and independent power producers, with named customers including UIL Holdings (owned by Avangrid, subsidiary of Iberdrola), the Long Island Power Authority, Southern California Edison, E.ON Connecting Energies, Korea Southern Power Company (KOSPO), Noeul Green Energy, and Gyeonggi Green Energy. Secondary markets include industrial and manufacturing facilities, pharmaceutical processing, universities, healthcare facilities, wastewater treatment plants, and data centers.

Value-chain role

Vertically integrated manufacturer and long-term operator. FCEL designs, manufactures, sells, operates, and services its own fuel cell systems. Manufacturing and R&D are conducted at its Danbury, Connecticut facility, with a Calgary, Alberta facility previously focused on solid oxide stack development. The company holds proprietary intellectual property in molten carbonate and solid oxide fuel cell technology, with the U.S. government retaining certain rights to some IP.

Geographic exposure

Primary markets are the United States and Canada. International markets include the EU and UK, and priority Asian markets: South Korea (described in the filing as the largest fuel cell market), Singapore, Malaysia, and Thailand. Named South Korean deployments include a 20 MW plant for KOSPO, a 20 MW plant for Noeul Green Energy, and a 58.8 MW plant for Gyeonggi Green Energy.

Source: SEC 10-K, filed 2025-12-18

Industry: Electrical Industrial Apparatus Peers: ESS Tech Inc Array Technologies Inc Blink Charging Co ENCORE WIRE CORP EnerSys GrafTech International Ltd SES AI Corp Kwikclick Inc STEM, INC.