The system was built by Plug Power, and uses hydrogen fuel cells in two 40ft shipping containers in a parking lot at Plug's headquarters in Latham, New York. Microsoft has added a simulated data center load, and run it through the same acceptance tests it normally applies to diesel generators, proving that it can keep the load running when the grid power fails. Hydrogen-fuel-cells-Carousel-5-and-3.jpg – Microsoft / John Brecher
According to Microsoft, the fuel cell implementation is a potential replacement for the large diesel gensets that most data centers use to provide backup power.
Right now, the fuel cell is merely a demo for Honda headquarters, but it is meant to demonstrate capabilities that could be put into practice for more widespread use in the future.