[oil pan 4]

In the US tidal power will likely be blocked on the east coast by nimbys
Most people who live on the coast will say they want it, just not where they live.
So for tidal power is for anywhere the nimbys aren't.
Other countries with 40 to 50 cent per kwh power might be more accepting.
Pumped hydro, already have it, already doing it, but like all hydropower in the US, we have already built as much as we are going to have. Again nimbys, nimbys hate pipe lines, they will block anything pipe line relayed even when it comes to clean energy.
Hydrogen is stupid.
Compressed air will work but it suffers from 50% efficiency.
Thermal energy kind of works, it's expensive and requires at least some natural gas, for electricity production.
Battery storage will work especially if it's molten salt based. But can't really make them out of Ni, Pb or Li.
I don't think fly wheels have ever rally worked real well.
Gravity batteries could, the the automatic wall building crane bot.