Images: Verizon's fuel cell project

In the winter, the excess hot water created by the fuel cell system is used to heat the building. Before the fuel cells were installed, the Garden City facility used about 50,000 gallons of fuel oil a year to keep these boilers working to heat the building. With the fuel cell system in operation, Verizon has cut its heating oil consumption at the Garden City facility to 22,000 gallons per year.

Photo by Marguerite Reardon/CNET News.com