[Sevii]

An under considered side effect of adding renewables to the grid is that electricity prices occasionally approach zero during times of over production. No reason not to use that energy for electrolysis its going to be wasted otherwise.

[thomasmg]

The problem with electrolysis is the high capital cost. As long as / where the price of electricity near zero only some of the time, it is too expensive. (With batteries and more photovoltaics this might change a bit.)