15 Jan '19 16:24>
@deepthought saidYou could get energy by having a variation of the space elevator.
I did a back of an envelope calculation using some figures from Wikipedia, the Earth's rotational energy is of the order of 9.6E37 Joules. In 2016 world wide power production was 2311 gigawatts. So at that rate of consumption the Earth's rotational energy would run out in about 3 trillion years. There would be no observable effects over mere geological timescales. Sadly I doubt there's a way of doing it.
You know the moon recedes from Earth about 2 cm a year.
So if you got a couple of space elevators say one on the Luna north pole and Earth's north pole and "just' launched a rope from elevator to elevator, Luna's retreat could stretch the rope which could be attached to a generator say on Earth's elevator and Luna would pull on the rope slowly unwinding a mechanism that goes to a shaft on which is mounted an alternator.
Not sure how much energy you would get but it would be 24/7, still generating power at midnight.
Well, unless the sun is really 50 miles high like flatasssers say😉