A growing number of companies believe using tethered kites and drones is a viable way to harness the stronger and more consistent high-altitude winds. Could this tech release wind power’s full potential, or will it always remain a niche solution? Wind power generated five times more electricity in 2018 than in 2008, according to recent figures from the US Energy Information Administration. Yet it still only accounts for about 4% of the world’s electricity. Critics point to the fact that the wind doesn’t always blow – the intermittency problem – making this form of renewable energy unreliable. But winds at higher altitudes – above 500m (1,640ft) – blow stronger and more consistently. An influential 2012 study from California’s Lawrence Livermore National Laboratory found that high-altitude winds alone could provide 100 times the global energy need.
BBC 3rd May 2019 read more »