Hydrogen Transmission Network. One-stop solution for humanity's water and energy needs. http://htnresearch.com/
That is an excellent idea...... but this may be easier to do for the short term: https://www.facebook.com/video.php?v=2123268237703397
Problem is that it is not very efficient. You must first make hydrogen which is not very efficient. Then burn it in an engine, which again is not very efficient.
Since the energy source of the reaction is solar energy, which is at no risk of running out, this is not a concern.
True...probably only about 40 gazillion times more than needed. Hydrogen is not as easy as people think. https://www.mpoweruk.com/hydrogen_fuel.htm