| Year | Detail |
| 1997 |
The company was founded. |
| 1999 |
The company becomes publicly traded. |
| 2000 |
The company entered into the European market. |
| 2007 |
The company acquired Cellex and General Hydrogen and started the first commercial market for fuel cells in material handling. |
| 2014 |
The company acquired ReliOn, adding fuel cell stack technology and stationary power products. |
| 2018 |
The company acquired American Fuel Cell. |
| 2020 |
The company acquired United Hydrogen and Giner ELX to broaden its hydrogen generation, liquefaction, PEM electrolysis, and distribution logistics capabilities. |
| 2022 |
The company acquired Joule Processing LLC. to expand hydrogen liquefaction and cryogenics capabilities. |
| 2024 |
The company started production of liquid green hydrogen from a Georgia plant in the U.S. |