I did refer to energy storage in the last post. Obviously you haven't read all the links.
New energy storage technology lags solar and wind tech. Simply because no one has been working on it as long as those other two technologies.
And, of course, energy storage is key to a successful renewable energy grid.
That said, there's plenty of groundwork and development of energy storage. Simple things like the ANU's study of potential pumped hydro sites in Australia. You have to get the information first in order to design the product.
Then there's collecting the data to confirm what you actually need. While we do have annual low periods of wind and sun, it is important to actually measure that rather than using ' anecdotal ' information. That way you can design your energy storage system correctly. E.g. the need for 4 hour storage as opposed to longer storage for days or weeks.
We also have to remember that we are just starting the development of offshore wind in Australia. Offshore wind performs differently to onshore wind and therefore acts as an alternative backup itself.
Then there's green hydrogen which will be a battery in itself. Lots of green hydrogen stored for days or weeks at a time to operate fuel cells or hydrogen engines or generators.