Fuel cells release electrical energy and heat from an electrochemical reaction similar to a battery's. When gases such as hydrogen are mixed with oxygen in the presence of a catalyst, they combine to produce water, along with electricity and heat. They do not produce the pollutants associated with combustion. The basic technology has been understood for more than 150 years, although recent advances in chemical engineering and materials science have led to rapid realization of real-world installations.

Unlike traditional acid or alkaline batteries, fuels cells can be continuously refueled. They currently serve as pollution-free alternatives to traditional generators with up to 3 megawatts of power. Designs are also emerging for smaller scale 2 to 3 watt systems that might power cell phones, for example, and a range of power needs in between, such as surface transportation.

See Fuel Cells in Action!

New Haven Water Pollution Control Authority
The "waste" heat is used to process up to 10,000 gallons per day of fat, oil, and grease.

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