Caterpillar Inc. received a Department of Energy award (DE-EE0009252) to develop and demonstrate a 1.5 MW polymer electrolyte membrane fuel cell (PEMFC) running on hydrogen to provide backup power for a data center. One key outcome is a first-of-its kind demonstration of a 1.5 MW fuel cell that can also respond dynamically to support the grid. A successful 48-hour simulated backup power event was proven with the use of liquid hydrogen as a fuel supply. The major development work involved systems integration and controls to allow power management of the fuel cell batteries and the grid. This presentation will cover the three-year project, from concept development to the evaluation of the performance of a prototype fuel cell and battery microgrid powered by hydrogen located at a data center.