Hydrogen in its element

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When Bob Sisk started delivering the mail in the 1960s, he was assigned an Army jeep for his route in the Washington suburbs.

Now, the 62-year-old letter carrier is carrying his bundles of letters and packages in a vehicle that offers an eerily quiet ride, doesn't rely heavily on oily lubricants anda emits droplets of water from the tailpipe.

Mr. Sisk is among a select group of government workers, researchers and residents testing hydrogen-powered vehicles in demonstration projects across the country. With gasoline prices hovering around the $3 mark this summer, the routine driving done by Mr. Sisk and others is helping researchers develop improvements for the technology, which could form the basis of the next generation of alternative vehicles.

"People think I was around for the horse-and-buggy days -- but I wasn't," Mr. Sisk said with a smile during a recent ride along his Springfield route aboard General Motors Corp.'s HydroGen3 minivan.

Virtually every automaker is conducting tests of hydrogen-powered vehicles, which have received support from a five-year, $1.2 billion hydrogen initiative President Bush first announced in his 2003 State of the Union address.

The pollution-free technology holds the potential of zero emissions and a sustainable source of energy produced when hydrogen and oxygen are mixed. The vehicles could begin appearing in showrooms by 2020, or even earlier, according to government and industry experts, but many obstacles exist, ranging from high costs and a lack of fueling stations to the need for improved storage capacity and better range.

With the technology still in its early stages, the vehicle testing gives automakers valuable information on their progress based on typical driving experiences.

From the back of a post office in a Virginia strip mall that includes a barbershop and a coin collector's store, Mr. Sisk takes the hydrogen vehicle, based on an Opel Zafira minivan, on his route three days a week.

"It drives like an ordinary car," Mr. Sisk said. The vehicle has a range of about 170 miles to 250 miles and a top speed of 99 mph, although Mr. Sisk said it's "not as fast on takeoffs" compared to a conventional vehicle.

In Albany, N.Y., Deputy Commissioner John Spano has acquired two Honda fuel-cell vehicles as part of the state's clean-fuel-vehicles program. The program, administered by New York's Office of General Services, maintains more than 5,000 alternative vehicles, including flexible-fuel vehicles, electric vehicles, hybrids and vehicles fueled by compressed natural gas and propane.