The fact that the current national grid system cannot handle the demand of a significant increase in power consumption is not an assumption, and that is just part of the equation. There currently isn't enough power generation available to produce the so-called forecasted demand of a fully electric vehicle transportation system, much less one half of that.
There is always ongoing investment in grid infrastructure. For example, new residential and commercial development. One must understand what increasing the grid capability really means, assuming there's even enough generation. Literally thousands of miles of copper wire, larger end grid transformers and distribution systems, just about everything below the primary distribution, plus a lot of trenches, poles, and societal disruptions on a mass scale.
Besides, where are these billions going to come from? In New York state like many others, for example, power companies are municipal (owned by residents), and whether municipally owned or not have KW rates fixed by state government. Most power companies are not hiding billions of dollars. What ever the cost it will ultimately be borne by the taxpayer anyways.
Regards,
Dusty
2019 Ram 1500 Billet Silver Laramie Quad Cab 2WD, 5.7 Hemi, 8HP75, 3.21 axle, 33 gallon fuel tank, factory dual exhaust, 18” wheels. Build date: 03 June 2018. Now at: 0530392 miles.