| Year | Detail |
| 1969 |
FuelCell Energy Inc. was founded as "Energy Research Corporation" by Bernard Baker and Martin Klein to focus on fuel cells and rechargeable batteries. |
| 1970s |
The company has received funding from the U.S. military and utility companies then it started conducting extensive research into low temperature fuel cells and silver-zinc battery cells. |
| 1980s |
Energy Research Corporation switches focus to high-temperature, high-efficiency carbonate fuel cells, leading to the flagship Direct Fuel Cell product. |
| 1990 |
The company has won a $32 million Department of Energy (DOE) contract to design, build, and test fuel cells that can operate on natural gas. |
| 1992 |
It has successfully demonstrated a 120 kilowatt (kW) high-temperature carbonate fuel cell system. |
| 1996 |
After continued research and development of the carbonate platform, a 2-megawatt (MW) fuel cell power plant goes online in Santa Clara, California. |
| 1999 |
Energy Research Corporation renamed itself FuelCell Energy and spun off its battery efforts as a separate company to develop batteries for the U.S. military. |
| 2001 |
FuelCell Energy opens a manufacturing facility to design, build, and support its technology in Torrington, Connecticut. |
| 2007 |
FuelCell Energy increases its presence throughout Korea and the broader Asian market. |
| 2011 |
FuelCell Energy demonstrates the first distributed hydrogen plant in its platform after years of continued product development. |
| 2013 |
Installation of a 14.9 MW fuel cell park in Bridgeport, Connecticut, and a 59 MW fuel cell park in South Korea (the largest fuel cell park in the world). |
| 2016 |
FuelCell Energy establishes a generation portfolio and enters into a joint development agreement with ExxonMobil for CO2 capture. |
| 2017 |
FuelCell Energy has begun its hydrogen distribution project with Toyota. The system is designed to produce three value streams: hydrogen, electricity, and water. |
| 2022 |
The company extends the term of the agreement with ExxonMobil for the development and deployment of carbon capture technology. |