Gene Long of Ball Aerospace demonstrates a high energy density portable fuel cell power system at the NHA booth at the Renewable Energy Expo, hosted by the House Renewable Energy Caucus in Washington, D.C., U.S.A., in April, 1996. This system is based on a PEM fuel cell developed by Ballard Power Systems, and contains the SOLID-H™ rechargeable metal hydride container developed by Hydrogen Components, Inc.