China's home-designed megawatt-scale commercial buoyant airborne turbine, the S1500, has successfully completed its maiden flight in northwest China's Hami after passing tests including full desert assembly and continuous high-wind deployment and retrieval.
At 60 meters long, 40 meters wide and 40 meters tall, it is by far the largest floating wind-power generator ever built, with the main airfoil and annular wing together forming a giant duct that houses 12 turbine-generator sets, each rated at 100 kW. Its rotors can harness the steady high-altitude jet stream and convert wind into electricity, which is then transmitted reliably to the ground through the tether cable.
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After several months, some more
of the airborne wind turbine reported previously (video below):
Measuring about 13 stories high (as previously reported, diameter of ~40 meters, length ~60 meters), the S2000 floating wind turbine can generate over one megawatt per hour. The helium-filled turbine was developed in Yunnan by Linyi Yunchuan (临一云川) Energy Technology Co., Ltd.
A clear advantage of floating turbines is variable altitude, as well as having access to much higher-velocity and more regular winds at overall higher altitudes than can be reached by fixed stations. Downsides include difficulty of maintenance, however what kind of maintenance is required and how susceptible they are to damage is highly dependant on the type of turbine deployed. This kind is only one of dozens of designs currently being researched, and I am truly eager to see which designs ultimately become most popular.
As far as the different designs I have seen up to now, I am a fan. The video says the company has entered small batch production and commercialization, showing progress from last year's test flight. According to the program chief engineer, Weng Hanke (翁翰钶), return on investment is approaching that of traditional turbines. Costs are likely still higher because they have not yet realized economies of scale.
Most exciting, he goes on to say that in the future Linyi Yunchuan plans to build even bigger versions with greater power generating potential, that will push the cost-per-killowatt down even further.