I see you posted my answer before I posted my question. Pretty soon we won't have to post at all. We'll just clairvoyant our thoughts.
Telepathy?
The question I have about you last point is what is the cost for the hydrolysis process of water? New products are developed for many reasons, or are improved, but cost is an important factor. Saudi Arabia pulls a barrel of oil out of the ground for about ten dollars.
But that's without the hidden cost for Carbon.
What would the electrolysis cost be to get the equivalent BTU's from oil?
Don't know, but it does require a modified engine AFAIK. We have a number of companies that run hydrogen powered buses in cities. The exhaust is water (vapor).
After all, if photovoltaics were so cheap, we'd all be off the commercial electric power grid.
Well, PVs are getting cheaper all the time, and efficiency gets better as well. Last Sunday we had an opening of a crowd-funded Solar Panel Field (7000 panels near a technology park) in Breda, no subsidies required, and the citizens who invested (from € 25 or more) get some 3% - 6% ROI (which is more than current interest rates) as immediate reduction (varies with energy price) on their electricity bill, and make a real contribution to the environment. We're probably at 50% of the achievable potential efficiency for Silicon-based PVs, so research is ongoing for stacked cells with additional different absorption spectra that are possible with other semiconductors.
But of course, there also has to be storage for when the sun doesn't shine (enough), and there are already different storage possibilities (amongst others, Hydrogen electrolysis). So it will require a mix of energy sources and as little burning of fossil fuel as possible.
Cheers,
Bart