<P> In May 2013, the Californian company Makani Power, developer of some crosswind hybrid kite systems with onboard generator doubling as motor, has been acquired by Google . </P> <P> In May 2013, an airborne wind energy system with a ground - based generator using fast motion transfer was suggested by L. Goldstein . </P> <P> In 2015, a sails on rope wind and ocean current energy system was invented by a Taiwanese Johnson Hsu. (1) </P> <P> On 15 December 2015 Windswept and Interesting Ltd demonstrated a "Daisy" kite ring stack airborne wind turbine . The Daisy kite stack demonstrated on 15 December 2015 is the only airborne wind energy system to have won the someawe.org 100 * 3 AWE challenge . The Daisy system uses tensioned torsion transfer of kite motion to turn a ground based generator . </P>

Airborne wind energy systems a review of the technologies