The system uses solar panels that track the sun across the sky during the day, with the electricity being used to electrolyze water for hydrogen production and storage. The water department currently has two vehicles retrofitted to run on hydrogen, one internal combustion and the other with a fuel cell. While Las Vegas is well suited to solar power applications, it is seriously lacking in water which makes this a dubious choice for this location. Coastal locations that could utilize solar power for a combination of desalination and hydrogen production are a much better choice for such an application.
[Source: Las Vegas Valley Water District]