Fuelcell Energy INC
At a glance
Employees100-499
In business sinceNot reported
HeadquartersDanbury, CT
US patents192
SAM.gov UEIFSN3MKNGEDX8
CAGE code63161
Incorporated inDE
LEI549300SRU8020X1X9J22
- power systems
- 12.5 MW
- 2.5 MW
- power generation
- combined heat
- microgrids
- biogas energy
- carbon capture
- electrolysis
- production
- data centers
Named on the company’s own website, read SEP 9, 2026
CareersCareers page — seen SEP 9, 2026
Supplier designations
For Profit OrganizationManufacturer of Goods
Self-certified by the company in its SAM.gov registration
Patents
192 US patents granted 2002–2025, 73 of them in the five years to SEP 2025.
Electrical machinery, apparatus, energy 152Chemical engineering 26Materials, metallurgy 4Thermal processes and apparatus 3Machine tools 3
- System including fuel cell assembly voltage monitorUS 12,412,913 · granted SEP 9, 2025
- Flow field baffle for molten carbonate fuel cell cathodeUS 12,374,703 · granted JUL 29, 2025
- Cathode collector structures for molten carbonate fuel cellUS 12,355,085 · granted JUL 8, 2025
- Fuel cell power plant with a racked fuel cell moduleUS 12,347,910 · granted JUL 1, 2025
- Fuel cell assembly with external manifold for parallel flowUS 12,334,607 · granted JUN 17, 2025
Newest 5 shown · Granted to FuelCell Energy, Inc. · PatentsView (USPTO), data through SEP 30, 2025 · CC BY 4.0
Their plants
3 FACILITIES| Facility | City | State | Employees | Status |
|---|---|---|---|---|
| Fuelcell Energy INC | Danbury | CT | 100–499 | LIKELY ACTIVE |
| Fuelcell Energy INC | Danbury | CT | 100–499 | ACTIVE |
| Fuelcell Energy INC | Torrington | CT | 100–499 | ACTIVE |
Compiled from federal records — EPA, OSHA, SAM.gov and the U.S. Census — and from the company’s own website. Federal source data is public domain. Each plant’s page names the source of every field.