Airborne Wind Energy (AWE) systems, essentially wind turbines in the sky (e.g. on kites or planes), have been promised for many years. There are several companies, many in Europe, that are working on AWE systems, including (but not limited to):
The basic advantages of AWE's are that one does not need a tower and therefore can use much less construction material to achieve the same amount of power, resulting in significant cost efficiencies. Furthermore, winds at high altitudes tend to be stronger and more stable than on the ground. AWE's also tend to be mobile, and controlled by software.
Some AWE ventures are targeting containerized systems with a nominal power of 100kW. One, Kitepower, is duration testing a 100kW system.
Will an airborne wind energy system of at least 100kW be sold before 2022?
This question will resolve positively if a credible company, customer, or media report establishes the sale of an Airborne Wind System that has a maximum rated power output of at least 100 kW. The system does not need to have been constructed yet.