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A helium-filled aerostat drifting to 13,000 feet above the desert \u2014 not for surveillance, not for advertising, but to generate electricity. That’s what Beijing Linyi Yunchuan Energy Technology<\/strong><\/a> reportedly pulled off at a test base in Northwest China. According to CCTV News, the company’s S4000<\/strong> airborne wind<\/a> energy system completed a full-process flight validation<\/a> covering ascent, station-keeping, power-generation testing, and controlled recovery. All indicators purportedly met required standards. Conventional turbines can’t reach these altitudes. That’s the whole point.<\/p>\n From ground to grid and back \u2014 here’s what the full flight cycle actually covered.<\/em><\/p>\n The S4000 is an upgraded version of the earlier S2000<\/strong>, which reached 2,000 meters during a January 2026 test and generated 385 kilowatt-hours<\/strong><\/a> \u2014 electricity reportedly delivered directly to the local grid. The new platform doubles that ceiling, targeting 4,000 meters (13,123 feet), where winds are typically stronger and more consistent than what ground-mounted turbines can access. The difference resembles fishing at the surface versus dropping a line into deeper water where currents are stronger and more reliable.<\/p>\n Advertisement<\/p>\n Advertisement<\/p>\nWhat the S4000 Actually Did at 4,000 Meters<\/h2>\n