Are plans being made to tie BEVs into this on a national scale?
Not much yet from the government itself, but it's a known opportunity. Smarter grids and changes in utility and customer behaviour (demand response, i.e. shifting demand to when power is cheapest and most abundant) would help a lot, and vehicle and house batteries would contribute to that.
Although I'll add that part of the point of the article is that even with zero storage you don't need much fossil supply, and that just supplying a large amount of wind and solar can massively cut our electricity emissions. Whereas focusing on the challenges of the last 1-2% too much can get us bogged down in the longer term problems, when we can address the immediate issue today. That doesn't mean that the longer term problems should be ignored, of course.