[ceejayoz]

For now. (And not everywhere. In Norway, 90% of that power would come from hydro plants.)

One of the most common objections to a wholesale switch to renewables is "what if it's cloudy / not windy" sort of thing. Cheap, widely deployed energy storage is key to answering that objection.

They go hand in hand. More batteries, more renewables, more batteries, more renewables, etc. etc. etc.

Eventually, the obvious goal is to charge everything via renewable power.