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It already does work.

This worked in 1970. Why wouldn't it work today? Energy storage solutions are deployed around the nation, and world, for this very reason.

The main advantage is that energy storage today is more efficient, with new technologies coming out.

> The main advantage is that energy storage today is more efficient, with new technologies coming out.

But not cheaper or anywhere close to the scale of pumped hydro?

Hydro requires favorable geography and/or rebuilding the grid to cope with the extremely large flows required to keep up with storage.

So, energy storage works, but is not economically feasible other than as research projects outside of hydro?

Looks like peaker plants are here to stay for a very long time.