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City dwellers know that wind on the ground is irregular, disturbed and often unpredictable. Buildings, trees and natural relief interrupt it, slow it down and make it less efficient. And yet, if you look up, you'll see that, a few thousand metres higher up, the situation radically changes.
Higher up, the wind becomes stronger, more constant and "cleaner". In recent years, this simple physical observation has given rise to one of the most interesting experiments on renewable energies in the world.
In China, a group of researchers and engineers has successfully tested a high-altitude wind power system, capable of producing energy by harnessing air currents at an altitude of around 2,000 metres. This is not a conventional turbine fixed to the top of a mast, but a flying structure, connected to the ground by a cable, designed to operate where the wind meets no obstacle.
The project is called SAWES S2000 and was put to the test on an experimental flight that demonstrated something far from theoretical: energy generated at altitude can be transmitted to the ground and fed into the power grid. During the test, the system generated several hundred kilowatt-hours, a quantity far from symbolic, sufficient - according to the technicians - to cover the consumption of dozens of electric vehicles in one hour.
The principle is less futuristic than it seems. A kind of helium-filled aerostat lifts the generator and light turbines to the desired altitude. From there, the wind does the rest. The electricity generated flows along the cable that keeps the system anchored to the ground, avoiding the need for towers, concrete foundations or large invasive structures.
The reason why high-altitude wind turbines arouse so much curiosity lies in a law of physics: wind energy increases exponentially with increasing speed. This means that even small increases in wind speed can translate into large increases in energy output. And at higher altitudes, the wind is often not only faster, but also more regular, reducing the typical downtime of conventional plants.
This is no small thing, especially at a time when renewables need to become more reliable, as well as cleaner. The ability to produce energy without occupying large areas of land opens up interesting prospects, even for densely populated areas or fragile territories, where the installation of new wind farms is becoming increasingly complicated.
Despite encouraging results, no one is talking about an imminent revolution. Getting wind turbines into the sky means tackling complex problems, from system control in adverse weather conditions to safety and airspace management. A flying installation must be able to be deployed, retrieved and secured without risk, especially in the event of storms or sudden breakdowns.
Then there's a question of rules. Flying at 2,000 meters is nothing like installing a wind turbine on a hill: aeronautical regulations, flight corridors and new responsibilities all come into play. All these aspects require time, experimentation and constant dialogue between technology and institutions.
(©GreenMe.it 2026 / Managing Editor : Selma Keshkire - The Press Junction / Picture : ©Unsplash)