the gas is held in another stable form then released on demand.
It must be released into a fuel cell to regenerate some of the power. If the H2 is converted into something more safe for storage then converted back for use in a fuel cell then there are two additional steps that reduce the amount of energy that can be recovered.
What I am saying is that the Norcea technique, while this may be a way to store solar energy, with reasonable loses, it is not an option for each and every house on the block. I, for one, do not want to pay the kind of attention to switching on a light that may set my hydrogen storage off and perhaps all the storage systems in the neighborhood. It's much better to generate this kind of power at a remote cite where it is the singular activity and can be controlled effectively. This technology should not be reduced to the casual because there is nothing causal about H2 generation or H2 power generation.