"Electrifying U.S. vehicles wipes out the equivalent of our entire current power demand."
Their first point: We must expand our existing electrical grid 35-40% to accommodate electric vehicles. It wipes it out in other forms, not electric. And while efficiencies increase, we still have finite transmission capacity.
The resources I got by googling "How much does the US electrical grid cost?" indicates that "decarbonization" would cost about $5 TRILLION dollars; doubling its capacity would undoubtedly be in the same price range.
"In contrast, renewables such as wind, solar and hydropower capture energy directly from infinite sources."
Wind, solar, and hydropower are NOT infinite resources. Nearly every economically-feasible location for hydropower has been exploited, at the expense of the destruction of communities, habitats, ecosystems, and species. The best locations for wind have already been exploited, at the expense of local habitability and wildlife, especially avian. Solar power is hovering around 35% efficiency, but requires fairly exotic materials for higher efficiency. These are often obtained in strip mines in 3rd world countries. Disposal of solar cells and panels is also shaping up to be a major ecological issue.
It doesn't fix the transmiision issues, either, unless you put solar cells directly on the cars--and the numbers don't work for cars made of steel. They're too heavy.
Another major issue is balancing out the supply and demand. Solar input is zero when demands for lighting and heating go up at night, and wind is a right fickle source--ask any sailor. There is a fixed, minimum baseline demand that is is supported by large coal and nuclear plants that are hard to start and stop; and variable demands that are met by gas and oil. If you want to support the huge baseline demand, you need a large storage system. Right now, that's batteries.
Electric cars require batteries, too. They are made of hard-to-obtain exotic materials. We already have international and range wars shaping up over battery and semiconductor source stocks. And disposal of exhausted batteries is another environmental disaster visible on the horizon.
Gasoline has about 100x the energy density of batteries; to quote topspeed.com, "Warp coils seem closer to reality than a battery with the energy density of gasoline".
In short, both electric and fossil-fueled vehicles are needed, and will be for some time. Electrifying our entire fleet of vehicles will almost certainly take longer than they think, cost more than they think, be harder than they think, and be less effective than they think, and it will come with its own set of unintended, unexpected, and unwanted consequences. The same will also be true of decarbonization of our electrical system.
By 2030? No way. Go ahead and start planning, working, and building; but pie-in-the-sky still has no nutritive value.