I came across this recent video on the Economics Explained YouTube channel. It begins by describing the electricity rationing that is happening now in China and then the video gets into the relationship between energy and prosperity.
I am interested in the idea of "energy as currency" because that idea can get into post-scarcity. I've touched on the Kardashev scale in past posts and there is a large amount of untapped energy that could be more than enough to meet the world's population many times over.
Blockchain technology and the internet of things can allow energy to be sold and traded directly from the grid. There's the concept of an “energularity” which is the energy version of the technological singularity.