"So the difference [meaning the charge] would have to come extracted from the planet"

Life in all forms always have.

Extract water from the river, fish from the sea, nuts from the tree, honey from the bees, wood from the tree and flesh and wool from the sheep...all are renewable. Expect many industries to evolve to bio-generation, like cement, glass and many chemicals and fuels we need. The same for pharmaceuticals. And with a shrinking population and changing industry I'm expecting that there will be more than enough metals and minerals to last for quite sometime.

Those electrons therefore have many useful potential applications. So "free" or "free of charge" is I think not the correct metric. Priority usage will, I think, govern how our future society will spend those stripped electrons best. As they will always have a time-equivalent value. For example the time a human will need to plant trees and harvest the wood to achieve the kWh equivalent.

So extraction is not the problem. It's the how and at which speed what matters. Even mining is possible if done in a fully restorative manner. So that will only happen if really necessary.

The problem is human nature....our loss aversion. Not many are prepared to let go of our current method of organisation and consumption until it's too far late and much harm to the natural regenerative system and social systems are done. The deeper the dip the far harder the re-rise of complex society becomes afterwards.