Charley, because water doesn't react exothermically with aluminum or any alloy thereof, I suspect General Atomics is concealing the source of the energy they're using to create hydrogen. It's likely the high-temperature gas reactor (HTGR) / hydrogen production system they've been working on for over two decades, using aluminum as a catalyst:

https://www.osti.gov/servlets/purl/814014

By this method alone, hydrogen can be produced economically and reliably with no carbon emissions at all. In the private sector we could completely decarbonize transportation with it, if the fossil fuel/renewables industries didn't have a stranglehold on energy policy.

This sort of hints that perhaps the few years before hydrogen fuel cell cars will be available to consumers is becoming fewer and fewer. Still, it's important to know that, both batter EVs and fuel cell cars are not entirely green. 

The truth is, electric cars and hydrogen fuel cell cars both have the potential to be wonderfully non-polluting forms of transportation, but to make them truly green we'll need to move away from methods of producing electricity that burn fossil fuels. Instead of burning coal to generate electricity, we'll need to concentrate on environmentally clean methods like hydropower, solar power, wind power and nuclear power, which produce little or no polluting emissions. When the day comes that most of our electricity comes from these sources, the electric car and the hydrogen fuel cell car will both be nearly perfect forms of green, non-polluting transportation.