How about hydrogen fuel cell technology? Hydrogen is a real beast to work with, but if NASA can made it work, it must have some potential as a fuel source.
But again, we need HUGE amounts of really cheaply generated electrical power to formulate the hydrogen from various water sources.
Which we can get from widespread application of thorium -fueled molten salt nuclear reactors. We have the technology, and with mass production, the costs of manufacture and implementation can ber brought down to competitive levels, replacing all kinds of solar and wind generation system, and eventually displacing all coal-fired plants, while phasing out uranium-fueled light water reactors.