UTC Fuel Cells, a unit of United Technologies Corp., today announced that it has signed development agreements with Nissan Motor Co. Ltd. to develop fuel cells and fuel cell components for vehicles. Renault, Nissan's alliance partner, is also participating in the development projects. In one of the two agreements, UTC Fuel Cells will provide fuel cell power plants to Nissan for evaluation, based on UTC Fuel Cells' proprietary ambient-pressure proton exchange membrane (PEM) fuel cell technology.