[ 1 ] Weiss P. Airborne wind energy prepares for take off. Engineering 2020;6 (2):107–9. link1

[ 2 ] Felker F. A long and windy road [Internet]. San Francisco: Makani; 2020 Feb 18 [cited 2020 Dec 16]. Available from: https://blog.x.company/a-long-andwindy-road-f8e09d02c9e1. link1

[ 3 ] Makani Technologies. Pulling power from the wind (feature film) [Internet]. San Francisco: X, the moonshot factory blog; 2020 Sep10 [cited 2021 Jan 4]. Available from: https://youtu.be/qd_hEja6bzE. link1

[ 4 ] Echeverri P, Fricke T, Homsy G, Tucker N. The energy kite: selected results from the design, development, and testing of Makani’s airborne wind turbines. Report. Alameda: Makani Technologies LLC; 2020 Sep.

[ 5 ] Echeverri P. Sharing Makani with the world: the energy kite collection [Internet]. San Francisco: X, the moonshot factory blog; 2020 Sep 10 [cited 2021 Jan 4]. Available from: https://blog.x.company/sharing-makani-withthe-world-the-energy-kite-collection-ea49398df78c. link1

[ 6 ] Deign J. Future of airborne wind energy in doubt as Google parent drops Makani [Internet]. New York: Greentech Media; 2020 Feb 19 [cited 2021 Jan 4]. Available from: https://www.greentechmedia.com/articles/read/airbornewind-energy-in-doubt-as-alphabet-drops-makani. link1

[ 7 ] Wind power 2.0: revolutionary airborne wind energy system to provide green power to the Republic of Mauritius (press release) [Internet]. Hamburg: SkySails; 2020 Dec 7 [cited 2021 Jan 6]. Available from: https://skysailspower.com/?artikel=Kite-Power-For-Mauritius. link1

[ 8 ] TEM#102 web meeting, 2020 Sep 23–24: introductory note [Internet]. Paris; International Energy Agency, IEA Wind Technology Collaboration Program; [cited 2021 Jan 4]. Available from: https://community.ieawind.org/tem102/ introductory-note. link1

[ 9 ] MegaAWE [Internet]. Lille: Interreg North-West Europe; [cited 2021 Jan 4]. Available from: https://www.nweurope.eu/projects/project-search/megaawematuring-utility-scale-airborne-wind-energy-towards-commercialization/. link1

[10] Horizon Europe [Internet]. Brussels: European Commission; [cited 2021 Jan 5]. Available from: https://ec.europa.eu/info/horizon-europe_en. link1

[11] Demonstrator AP3 [Internet]. The Hague: Ampyx Power; [cited 2021 Jan 5]. Available from: https://www.ampyxpower.com/technology/demonstratorap3/. link1

[12] Ampyx power teaser—taking off in 2021 [Internet]. The Hague: Ampyx Power; [cited 2021 Jan 5]. Available from: https://www.youtube.com/watch? v=2tJpMA76dyo. link1

[13] Leslie M. The next energy battle: cheap natural gas versus renewables. Engineering 2021;7(2):133–5. link1

[14] Anderson M. Exclusive: airborne wind energy company closes shop, opens patents [Internet]. New York: IEEE Spectrum; 2020 Sep 15 [cited 2021 Jan 5]. Available from: https://spectrum.ieee.org/energywise/energy/renewables/ exclusive-airborne-wind-energy-company-closes-shop-opens-patents. link1

[15] Reed S. A monster wind turbine is upending an industry [Internet]. New York: New York Times; 2021 Jan 1 [cited 2021 Jan 5]. Available from: https://www. nytimes.com/2021/01/01/business/GE-wind-turbine.html?smid=em-share. link1

[16] Deign J. Airborne wind players still hoping for takeoff after Alphabet ditches Makani [Internet]. New York: Greentech Media; 2020 May 22 [cited 2021 Jan 5]. Available from: https://www.greentechmedia.com/articles/read/airbornewind-players-line-up-for-takeoff-after-makani. link1

[17] D’Onfro J. Alphabet shutters its energy kite company, Makani [Internet] Jersey City: Forbes; 2020 Feb 18 [cited 2021 Jan 5]. Available from: https:// www.forbes.com/sites/jilliandonfro/2020/02/18/alphabet-shutters-its-energykite-company-makani/?sh=167134672b20. link1