Renewable energies of the future: Wind collecting drones

The medium sized drones collect energy through their blades, while hanging from hydrogen balloons. Although each drone collects small amounts, their strength is their number. Their energy is gathered in "Collectors", which then convey the energy to the next hub.They are retracted into the buoys in case of heavy weather. And even if they get loose: they are entirely made of bio-degradable non-plastics, which are eaten by marine microorgansim in case of longer submersion.