http://www.gizmag.com/ge-fabric-wind-turbine-blades/25281/

In a bid to help shape the inexorable march toward more efficient
wind power, General Electric Power and Water is developing a new fabric-covered
wind turbine blade which promises to cut the cost of wind turbine manufacture
significantly, while also allowing a larger blade size, and facilitating easier
transportation.

GE’s project calls for architectural fabric to be tightly wrapped around a metal
space frame, to create a viable wind turbine blade. According to the company,
such a design should allow for rotor diameters which exceed 120 meters (393
feet) – a feat generally not thought practical with the more widely-used
fiberglass blades.

Favoring fabric over fiberglass could also ease wind turbine blade production
costs by an impressive 25 to 40 percent. Indeed, GE reckons the technology will
eventually allow wind turbine power to be as economical as fossil fuels, without
government subsidies.

Thanks to Carson Capaul.