The Earth has been likened to an electrical generator.
The Earth possesses a molten metal core and spins on its axis, and as the solar wind’s electrically charged particles flow against the planet, this plasma interacts with the planet’s magnetic field lines extending from pole to pole and streams out into space.
Too bad we haven’t figured out how to exploit that energy source for near-earth space propulsion.
The technology is doable. It's just that every time we try it, huge number sof energy-feeding ETs show up and get in the way of us being able to do any real work. We have a complaint in to the Galactic Council, but they say it's a local problem and we have to work it our betwen us.
No, I'm not kidding.
