Any green gas could be that storage. With solar power around $.01/kwh in some sunny places, converting that energy into storable gas/liquids can be profitable even at low efficiency rates. And we already have an existing network to transport, store and burn gases. Converting those from natural gas to other gases is likely easier than rebuilding everything.
From all that I read, Ammonia is a prime candidate. Especially because there's an existing large market for it, so producers don't have to bet on a new market to ramp up production. But there's no real reason why some power plants, ships and maybe even trucks couldn't be driven by Ammonia in the future.
From all that I read, Ammonia is a prime candidate. Especially because there's an existing large market for it, so producers don't have to bet on a new market to ramp up production. But there's no real reason why some power plants, ships and maybe even trucks couldn't be driven by Ammonia in the future.