Robots and drones can take on and complete tasks that are hard and dangerous for humans, e.g. firefighting. They can also be used for wind turbine maintenance as this video from Aerones shows:
The drone features gyroscopes and accelerometers to determine the precise angle. It comes with 2 controllers, parachutes, and 28 motors for redundancy. Since electricity can be provided from ground level, these wind turbine drones can fly for hours.