Just looking at energy storage/transmission, the experts I've heard that aren't clearly pushing hydrogen seem to think that it's going to be mostly a niche prod

Just looking at energy storage/transmission, the experts I've heard that aren't clearly pushing hydrogen seem to think that it's going to be mostly a niche product. Might be used for aircraft, ocean shipping, and other places where batteries don't have the requisite energy density and the refueling infrastructure can be installed in a limited number of places (ie, not for passenger vehicles). Might be used for seasonal energy storage. Although there are relatively few places (salt caverns) in which to store it. Interestingly the same study concluded that natural gas + carbon capture is the next most economically feasible option. https://environment-review.yale.edu/power-127-hours-economics-long-duration-energy-storage https://environment-review.yale.edu/power-127-hours-economic... Might be stored in an easier-to-handle form - eg make hydrogen, turn it into ammonia, and store that. Of course that lowers the round-trip efficiency even more. Some utilities have talked about injecting 5-10% hydrogen into the existing natural gas infrastructure to partially de-carbonize domestic heating.