This is a great article that uses real data to see how our grid world perform with greater wind, solar and storage. It shows that we can easily achieve a 95% renewable grid with a modest level of storage.
What i really like about this, is it has been running for 2 years now, and it is pragmatic about its aims (ie, not 100%), it aims for reality (this is real data that is collected weekly), and it looks at the cost (in $$ and CO2-e).
He sets some targets (60% Wind, 45% Solar + storage), then works off of the actual data to scale the wind & solar generation, to see how it would meet demand. excess is accumulated in storage (theoretical battery storage and actual hydro), and shortfalls is taken from storage.
The really nice part shows where "other" is required, in Australia's case, existing fossil fueled peaker plants.
I often use his 1st year report to have the discussion with "non-believers" to show what is possible, and where the gaps are to achieveing a renewable grid.
Have a read and let me know what you think.
I think the problem with just looking at Canberra is that it can dump or import from NSW and the other parts of the grid, similar to SA, though on a smaller scale.
This looks at the entire network to see what is feasible, without being able to shunt excess generation or import from other networks.