The U.S. Army unveiled a fleet of General Motors-made hydrogen fuel-cell electric vehicles in Hawaii as part of that state's efforts to cut down its use of fossil fuels and its dependence on non-renewable energy.

All U.S. military branches will test the vehicles to find out the effectiveness of using hydrogen fuel cells as a transportation source. Hydrogen proponents view fuel cell powertrains as optimal because they can provide driving ranges similar to conventional vehicles without the fossil fuel emissions, but H2 vehicles are also very expensive. Two years ago, GM and Hawaii's Gas Co. said they would lead an effort to build as many as 25 hydrogen fueling stations throughout the state by 2015.

Hawaii, which gets more than 95 percent of its energy from imported fossil fuels, is taking a leading role in advanced-powertrain adoption because of the high costs of delivering gasoline to the state. The U.S. Energy Department and the 2009 American Recovery and Reinvestment Act is investing an estimated $4.5 million as part of an effort to reduce Hawaii's transportation fuel consumption by two-thirds over the next two decades.
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