[rootusrootus]

> not good enough for grid-scale requirements

Is that still true? Aren't there a number of very successful grid battery installations now? And given the steady decline in battery costs, it ought to just get better and better.

[dgacmu]

Batteries are amazing for short term supply / grid stabilization. They can supply massive current on very short notice. But the cost per kilowatt hour is still painfully high if we're talking about more than a handful of hours. Fortunately, it's still headed downward.

[xyzzyz]

There are successful grid battery installations, but as far as I know, there are no grid-scale battery installations. Existing installations have really small capacity, and are only used for things like demand smoothing. The only energy storage solution deployed at scale is pumped hydro storage.

[gpm]

For anyone wondering

List of pumped-storage hydroelectric power stations https://en.wikipedia.org/wiki/List_of_pumped-storage_hydroel...

List of (non-hydro) energy storage power plants https://en.wikipedia.org/wiki/List_of_energy_storage_power_p...

Largest battery plants in particular: https://en.wikipedia.org/wiki/Battery_storage_power_station#...

"Really small capacity" here apparently means "roughly 4 hours of discharging as fast as possible".