You're right about the numbers, but still this is tiny at the scale of the grid. 2.8GWh is still only around 5 mins of consumption. You would probably need a

You're right about the numbers, but still this is tiny at the scale of the grid. 2.8GWh is still only around 5 mins of consumption. You would probably need a few days of storage to run a 100% wind/solar grid, so that's about 1000x more.