Numerous companies in the airborne wind turbine market, Makani, Joby: https://www.greentechmedia.com/articles/read/a-beginners-guide-to-the-airborne-wind-turbin

Numerous companies in the airborne wind turbine market, Makani, Joby: https://www.greentechmedia.com/articles/read/a-beginners-guide-to-the-airborne-wind-turbine-market https://www.greentechmedia.com/articles/read/a-beginners-gui... Numerous proposals, including from Lockheed, for balloon satellites: https://en.wikipedia.org/wiki/High-altitude_balloon#Geostationary_balloon_satellite https://en.wikipedia.org/wiki/High-altitude_balloon#Geostati... These aren't just "because we can" frivolous projects, these approaches have serious advantages over others, such that many are racing to commercialize it.