I've just had an idea about communicating overdrive to new players.
While the grid circles in eco view are good, I think they still don't drive the point home well enough.
My thought was making actual connections (lightning? beams?) between energy buildings with overlapping grids.
I'm not 100% sure how it should look, if it should be continuous or show every few seconds, if it should depend on the amount of energy in the grid etc.
Another unrelated idea is to add some indicator of overdrive to energy structures similar to the spinning speed of mexes, but this doesn't convey the connectivity imo.