Steve,
Check out the website at Hydrogen Engine Center and the quantity of hydrogen they use on a variety of engines they run for power gen. All of their engines are hardened and made to run for 10 plus years on pure hydrogen.
They have 1400 engines in the field and really know their stuff. I think you guys have a new company over their called HyEngine.com or something like that. They are doing some very cool things with Hydrogen motors as well.
But these engines consume great quantities of hydrogen, so very cost effective generation is critical. It is also critical that you do not have to compress it, store it, transport it, and build an infrastructure to support it. Even if it is cheap to make, if you still have to do all of the latter, it doesn't play.
Bear