The energy cycle of dense hydrogen (often thought of as liquid hydrogen) appears to be extremely challenging with current technologies - especially if the energy required is supplied exclusively by "renewables" of solar/wind. Refinery hydrogen cuts out the first energy hog of raw hydrogen production, but is normally needed to hydrogenate heavier HCs to fuel, so not really available in the quantities needed if HCs fuels are severely reduced and refineries become mostly chemicals feed plants (as planned?).
Of course the life-cycle costs are another issue that will be extremely challenging as the purification and compression facilities will likely require batteries (some type of peak energy storage) to level off peak energy production of all renewables so that these facilities can be designed for decent on-stream factors. End point carbon reduction also becomes questionable.
Not against "hydrogen", but also believe some major break-throughs are needed to become mainstream for any type of HC based liquid/compressed fuels. Meanwhile, can it compete with military/highly resilient facilities that need to depend on nothing more than water, wind and sun (aircraft carrier :mrgreen: ). Nuclear will likely always win. Just IMO
Of course the life-cycle costs are another issue that will be extremely challenging as the purification and compression facilities will likely require batteries (some type of peak energy storage) to level off peak energy production of all renewables so that these facilities can be designed for decent on-stream factors. End point carbon reduction also becomes questionable.
Not against "hydrogen", but also believe some major break-throughs are needed to become mainstream for any type of HC based liquid/compressed fuels. Meanwhile, can it compete with military/highly resilient facilities that need to depend on nothing more than water, wind and sun (aircraft carrier :mrgreen: ). Nuclear will likely always win. Just IMO