Once relegated to the realm of science projects, hydrogen fuel cells are starting to displace fossil fuels as a means of powering cars, homes and businesses. On June 10, in the latest addition to mainstream fuel-cell use, Hyundai Motor Co. will begin deliveries of a consumer SUV in Southern California . The technology is already producing electricity for the grid in Connecticut. AT&T Inc. is using fuel cells to power server farms, and Wal-Mart Stores Inc. uses hydrogen-powered fork lifts. Later this, summer FedEx Corp. will begin using hydrogen cargo tractors at its Memphis air hub. “This is the most exciting time for fuel cells in my career,” said Daniel Dedrick, head of hydrogen and combustion technologies at Sandia National Laboratories in Livermore, California. The hydrogen market “is starting to accelerate.” Fuel cells produce electricity from hydrogen in a process that dates back to the 1830s, yet high costs […]