While pumped hydro will definitely play a role in seasonal storage, I doubt it's going to be the main solution. IMO, hydrogen and biogas are going to be playin

While pumped hydro will definitely play a role in seasonal storage, I doubt it's going to be the main solution. IMO, hydrogen and biogas are going to be playing dominant large roles in seasonal storage once the grids becomes so renewable-heavy that normal daily operation during normal weather can be covered by wind and solar.