The fuel cell sector is continually expanding. Many cities are installing fuel cells as auxiliary power sources for essential services, major corporations have also been installing fuel cell systems powering retail sites, data centers and other facilities. Railroad and telecom companies use fuel cells to power communication towers and signaling infrastructure. Fuel cell - powered forklifts, deployed in warehouses and distribution centers, became common around the globe and fuel cell electric vehicles have become available for purchase or lease and fuel cell buses are in operation in several countries. Despite all of these developments, the potential of fuel cells is far from having been reached and much work remains to be done.