Makes sense -- the grid storage system I read about was indeed the one they built for the Australian wind farm.

I think there's a big gap for both types of storage - fast dispatching for intraday demand variations, replacing gas peakers, and more static storage as in the OP for multi-day gaps in renewable production such as periods of high pressure during winter when wind speeds and irradiance are both very low.

Can't wait to see how this market develops.