Fuel cells are basically hydrogen batteries.
Fuel cells are very efficient, and they produce only water as a by-product, so they are friendly to the environment. In fact, fuel cells can be used almost anywhere, even at the most remote locations where power lines don't go or mounted on cars, trucks and buses to make low-emission vehicles. Fuel cells are expensive, but researchers and manufacturers are doing their best to bring down the costs now compared to costs of conventional power generation. There's a lot to know about fuel cells. If you'd like to learn more about fuel cells from someone who is designing and building them, visit the Web site of German fuel cell maker Heliocentris GmbH or send an e-mail to Henrik Colell and Brian Cook, two guys working for Heliocentris who helped write this section.