27% is a misleading number because it is the average for the whole period. On some days, wind and solar can provide 100% of all electricity. But on windstill nights, it is closer to 0%. Without having a way to store a whole nation's energy needs for several days or even weeks, you still need fossil fuels (or nuclear).
> Without having a way to store a whole nation's energy needs for several days or even weeks
That requirement makes no sense, though. Do you foresee a massive volcanic eruption that there will be darkness for several weeks? Because it's sort of fact of life that the sun always rises tomorrow. Therefore asking for 100% of storage for weeks never made any sense.
