H-5000 PEM Fuel Cell - 5kWWhy Fuel Cells and Hydrogen? Hydrogen Power Fuel cells can be thought of as alternative energy devices that unlock the power of hydrogen. They convert chemical energy into electrical energy. Hydrogen fuel cells do this very cleanly, with no toxic emissions, and with a high efficiency. Hydrogen and fuel cell technologies have many potential clean energy applications from running our vehicles, to powering our cellular phones and laptops, to heating our