That's what I was thinking. Most electricity is generated by coal burning plants, nuclear plants or hydro turbines. Anything that interrupted coal mining and transport would cause most electrical grids to go down. Nuclear plants are even easier to stop without international trade and highly skilled staff.
Trade breaks down; coal, hydro nuclear plants go dark. Some enterprising post-apocalypse Bill Gates type gets the bright idea to open an athletic studio/exercise center. He gets his engineer friend to connect all the self-powered exercise bikes and treadmills together to form electrical generators and sells his electricity. People join his gym, get exercise AND provide electricity for themselves and neighbors.
Well, we only saw that one guy who wasn't even a real Monk. He was a Ranger pretending to be a Monk to hide his work of re-introducing technology to Earth.
Why didn't any of the Earth colonies just immediately move back to help Earth?
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