International renewable energy consultancy GL Garrad Hassan says a cottage
High-altitude wind sector taking off as '22 firms develop systems'
The kites, gliders and other innovative prototypes under development by the 22 companies now active in the high-altitude wind-energy (HAWE) sector are beginning to attract investment, a new study says.
25 August 2011 14:51 GMT
Updated
23 September 2016 12:51 GMT
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