alt Hacker News> If you use Renewable Energy Sources, it may happen there will be no wind or no sun
If you have to import fuel, it may happen that no ships can get through. Or the fuel becomes too expensive to buy because of war, natural disasters, or market forces. Ain't nobody turning off the sun or wind.
> Maybe, when we have technology to store efficiently electricity at scale
Actually we have it now.
Battery storage that works at grid-scale is a fairly recent technological innovation. It's good that humanity figured out this technological innovation, and demand for better battery technology from the smartphone and electric car revolutions had a lot to do with it. But battery storage is still expensive and relatively-new physical infrastructure that takes time and expense to deploy at scale, and it's still in the process of happening now.