Apart from the impossibility of harvesting energy, here's another way to sanity-check your grand designs.
A highway all the way around Earth would be a structure at least 40,000 km long. Let's optimistically say you can build such a highway by launching it in sections 100 m long each. That means 400,000 launches to create the highway.
We have only launched 6,600 satellites to date, and they're in all kinds of different orbits. The most densely-populated orbit is the geostationary orbit, with about 300 satellites.
The amount of energy put into 1 satellite is exactly 1 rocket launch. You can never recover more energy than what was put in.
So in geostationary orbit, you can harvest at most 300 launches worth of energy. For an energy cost of 400,000 launches.