Google has acquired a US start-up that generates power using turbines flying on robotic tethered kites.
Makani Power will become part of Google X - the secretive research and development arm of the search giant.
The deal comes as Makani carries out the first fully autonomous flights of robot kites bearing its power-generating propellers.
"No-one gets an ironclad guarantee of success. Certainly, factors like opportunity, luck and timing are important. But the backbone of success is usually found in old-fashioned, basic concepts like hard work, determination, good planning and perseverance" -- Mia Hamm