I had a dream last night that gave me an idea for the plot of a good short story. It involves a man who has a dirt phobia who wants to cover the Earth with concrete so he never has to touch dirt again. But he realizes that there isn't enough material on the Earth to make enough concrete to do the job so he wants to mine the moon to get the raw materials. In doing this, he creates a tube from the moon to the Earth that he uses to transport the moon materials back to Earth but the tube becomes clogged and he is forced to make an emergency repair in outer space using something like an industrial sized plumbers snake. The problem he has is that there isn't enough power to run the machine that spins the coil to unclog the tube and has to find another power source. I'm stuck finding a way to power the snake that doesn't involve some sort of solar power array that would have to be built. The cost would be prohibitive to the project. Any ideas?