That report can be found online at the URL below…
https://www.eia.gov/outlooks/aeo/
Here, I reproduce two graphs from the Energy Outlook, to make the point that there is and will be a surplus of electricity in the coming years and decades.
The question is not, “Where the electricity will come from to power millions of EVs?”
But rather, “How economically and environmentally affordable will it be?”
We do not need all of the hydro-capacity of BPA.