I don't have a link offhand (my apologies), but there is a DOE report floating around out there from 1-2 years ago stating that almost 80% of the current light vehicle (cars) fleet in the US could be converted over to using the electric grid solely with existing generating capacity.
Combined with the relentless expansion of solar and wind in the US, I disagree with your assertion that energy prices will rise long-term. You'll probably see peaks and troughs as demand increases and supply comes online, but there is a lot of land left for renewables to be deployed to.
Generating capacity isn't the only concern. Distribution capacity is another issue. Thankfully, the vast majority of the projected 30% increase in consumption will not coincide with summertime peak ( air conditioning ) loads, but it may be enough to worry some utilities, especially in the congested Northeast corridor of the US.
Combined with the relentless expansion of solar and wind in the US, I disagree with your assertion that energy prices will rise long-term. You'll probably see peaks and troughs as demand increases and supply comes online, but there is a lot of land left for renewables to be deployed to.