The cable transports the electric current to the ground. There are substantial advantages in both efficiency and power over conventional ground based wind turbines. Roberts estimates a single commercial gyromill would provide twenty megawatts of power, enough for 7000 homes and more than thirty times what a modern standard wind turbine makes. If his calculations are correct, a wind farm of 120 of these machines would provide the same power as Britain s Sizewell B nuclear plant. Another advantage of the device is that it is well out of sight and hearing.
Many people object to modern wind turbines blighting a beautiful landscape.
To bring them down, the machines can be landed as helicopters, or reeled in like kites. The only real necessity is a large area of land, and a safely controlled and restricted airspace around it.