Earlier quoted context omitted.
South Australia is getting close. [1] Give it a year or two. > Sometimes the sun does shine and the wind does blow. That’s most of the time in South Australia, apparently. The average share of wind and solar during October was 72%. For 29 out of 31 days, 100% of the power used in South Australia (SA) was renewable. The sky didn’t fall, the grid didn’t collapse, and the apocalypse is not nigh. [1]: https://cleantechni…
Looks like Australia has relatively stable amount of sunshine during whole year. In Poland, in December there's less than one hour in a day.
Different areas will require different trade-offs. Higher latitudes, excluding inside the polar vortex, tends to have larger amount of wind in the winter.
Currently storage does not make sense because the cheapest store of energy is a smart consumer. It will be very interesting to see if actual storage outside of governmental emergency backups will ever be needed in wind heavy deployments.