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November 12, 2013 - 5-MW Dynamometer Drive Line at the National Wind Technology Center. (Photo by Mark McDade / NREL)

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27645.jpg

September 16, 2013 - Thomas C. Kiernan, Chief Executive Officer and Liz Salerno, Director, Industry Data & Analysis at the American Wind Energy Association stand atop the Siemens wind turbine at National Wind Technology Center. (Photo by Fort Felker / NR

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27644.jpg

September 16, 2013 - Thomas C. Kiernan, Chief Executive Officer and Liz Salerno, Director, Industry Data & Analysis at the American Wind Energy Association stand atop the Siemens wind turbine at National Wind Technology Center. (Photo by Fort Felker / NR

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27643.jpg

September 16, 2013 - Thomas C. Kiernan, Chief Executive Officer of the American Wind Energy Association standing atop the Siemens wind turbine at National Wind Technology Center. (Photo by Fort Felker / NREL)

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August 26, 2013 - Photos of the inside of the CGI for Controllable Grid Interface. (Photo by Dennis Schroeder / NREL)

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August 26, 2013 - Photos of the inside of the CGI for Controllable Grid Interface. (Photo by Dennis Schroeder / NREL)

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27444.jpg

August 26, 2013 - Photos of the inside of the CGI for Controllable Grid Interface. (Photo by Dennis Schroeder / NREL)

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August 26, 2013 - Photos of the inside of the CGI for Controllable Grid Interface. (Photo by Dennis Schroeder / NREL)

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August 26, 2013 - Photos of the inside of the CGI for Controllable Grid Interface. (Photo by Dennis Schroeder / NREL)

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27441.jpg

August 26, 2013 - Photos of the inside of the CGI for Controllable Grid Interface. (Photo by Dennis Schroeder / NREL)

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August 26, 2013 - Photos of the inside of the CGI for Controllable Grid Interface. (Photo by Dennis Schroeder / NREL)

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August 26, 2013 - Photos of the inside of the CGI for Controllable Grid Interface. (Photo by Dennis Schroeder / NREL)

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August 26, 2013 - Photos of the inside of the CGI for Controllable Grid Interface. (Photo by Dennis Schroeder / NREL)

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August 26, 2013 - Photos of the inside of the CGI for Controllable Grid Interface. (Photo by Dennis Schroeder / NREL)

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August 26, 2013 - Photos of the inside of the CGI for Controllable Grid Interface. (Photo by Dennis Schroeder / NREL)

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August 26, 2013 - Photos of the inside of the CGI for Controllable Grid Interface. (Photo by Dennis Schroeder / NREL)

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August 26, 2013 - Photos of the inside of the CGI for Controllable Grid Interface. (Photo by Dennis Schroeder / NREL)

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August 26, 2013 - Photos of the inside of the CGI for Controllable Grid Interface. (Photo by Dennis Schroeder / NREL)

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27432.jpg

August 26, 2013 - Photos of the inside of the CGI for Controllable Grid Interface. (Photo by Dennis Schroeder / NREL)

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August 26, 2013 - Photos of the inside of the CGI for Controllable Grid Interface. (Photo by Dennis Schroeder / NREL)

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August 26, 2013 - Photos of the inside of the CGI for Controllable Grid Interface. (Photo by Dennis Schroeder / NREL)

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August 26, 2013 - Photos of the inside of the CGI for Controllable Grid Interface. (Photo by Dennis Schroeder / NREL)

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27428.jpg

August 26, 2013 - Photos of the inside of the CGI for Controllable Grid Interface. (Photo by Dennis Schroeder / NREL)

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August 26, 2013 - Photos of the inside of the CGI for Controllable Grid Interface. (Photo by Dennis Schroeder / NREL)

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August 26, 2013 - Photos of the inside of the CGI for Controllable Grid Interface. (Photo by Dennis Schroeder / NREL)

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August 21, 2013 - A specially configured truck, carrying a GE 2.75MW turbine weighing more than 96 tons, delivers the nacelle to the new 5MW dynamometer at the NWTC. (Photo by Mark McDade / NREL)

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August 21, 2013 - A specially configured truck, carrying a GE 2.75MW turbine weighing more than 96 tons, delivers the nacelle to the new 5MW dynamometer at the NWTC. (Photo by Mark McDade / NREL)

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August 21, 2013 - A specially configured truck, carrying a GE 2.75MW turbine weighing more than 96 tons, delivers the nacelle to the new 5MW dynamometer at the NWTC. (Photo by Mark McDade / NREL)

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August 21, 2013 - A specially configured truck, carrying a GE 2.75MW turbine weighing more than 96 tons, delivers the nacelle to the new 5MW dynamometer at the NWTC. (Photo by Mark McDade / NREL)

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August 21, 2013 - A specially configured truck, carrying a GE 2.75MW turbine weighing more than 96 tons, delivers the nacelle to the new 5MW dynamometer at the NWTC. (Photo by Mark McDade / NREL)

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August 09, 2013 - Pete Johnson of Gemini Rope Access Solutions, inspects the blades of a 3MW Alstom wind turbine by repelling down the blades. The turbine is undergoing testing at NREL's National Wind Technology Center (NWTC) in Boulder, Colorado. (Phot

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August 09, 2013 - Pete Johnson of Gemini Rope Access Solutions, inspects the blades of a 3MW Alstom wind turbine by repelling down the blades. The turbine is undergoing testing at NREL's National Wind Technology Center (NWTC) in Boulder, Colorado. (Phot

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August 09, 2013 - Pete Johnson of Gemini Rope Access Solutions, inspects the blades of a 3MW Alstom wind turbine by repelling down the blades. The turbine is undergoing testing at NREL's National Wind Technology Center (NWTC) in Boulder, Colorado. (Phot

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August 09, 2013 - Pete Johnson of Gemini Rope Access Solutions, inspects the blades of a 3MW Alstom wind turbine by repelling down the blades. The turbine is undergoing testing at NREL's National Wind Technology Center (NWTC) in Boulder, Colorado. (Phot

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August 09, 2013 - Pete Johnson of Gemini Rope Access Solutions, inspects the blades of a 3MW Alstom wind turbine by repelling down the blades. The turbine is undergoing testing at NREL's National Wind Technology Center (NWTC) in Boulder, Colorado. (Phot

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27200.jpg

August 09, 2013 - Pete Johnson of Gemini Rope Access Solutions, inspects the blades of a 3MW Alstom wind turbine by repelling down the blades. The turbine is undergoing testing at NREL's National Wind Technology Center (NWTC) in Boulder, Colorado. (Phot

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August 09, 2013 - Trask Bradbury, of Gemini Rope Access Solutions, inspects his rope after inspecting the blades of a 3MW Alstom turbine undergoing testing at NREL's National Wind Technology Center (NWTC) in Boulder, Colorado. (Photo by Dennis Schroeder

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August 09, 2013 - Pete Johnson of Gemini Rope Access Solutions, inspects the blades of a 3MW Alstom wind turbine by repelling down the blades. The turbine is undergoing testing at NREL's National Wind Technology Center (NWTC) in Boulder, Colorado. (Phot

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August 09, 2013 - Pete Johnson of Gemini Rope Access Solutions, inspects the blades of a 3MW Alstom wind turbine by repelling down the blades. The turbine is undergoing testing at NREL's National Wind Technology Center (NWTC) in Boulder, Colorado. (Phot

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August 09, 2013 - Pete Johnson of Gemini Rope Access Solutions, inspects the blades of a 3MW Alstom wind turbine by repelling down the blades. The turbine is undergoing testing at NREL's National Wind Technology Center (NWTC) in Boulder, Colorado. (Phot

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August 09, 2013 - Pete Johnson, top and Trask Bradbury with Gemini Rope Access Solutions, work together as they inspect the blades of a 3MW Alstom turbine undergoing testing at NREL's National Wind Technology Center (NWTC) in Boulder, Colorado. (Photo by

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August 09, 2013 - Pete Johnson of Gemini Rope Access Solutions, inspects the blades of a 3MW Alstom wind turbine by repelling down the blades. The turbine is undergoing testing at NREL's National Wind Technology Center (NWTC) in Boulder, Colorado. (Phot

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August 09, 2013 - Pete Johnson of Gemini Rope Access Solutions, inspects the blades of a 3MW Alstom wind turbine by repelling down the blades. The turbine is undergoing testing at NREL's National Wind Technology Center (NWTC) in Boulder, Colorado. (Phot

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August 09, 2013 - Pete Johnson, left and Trask Bradbury with Gemini Rope Access Solutions, check the weather forecast and review the safety plans before inspecting the blades by repelling down a 3MW Alstom turbine undergoing testing at NREL's National Win

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August 09, 2013 - Pete Johnson of Gemini Rope Access Solutions, checks his safety gear before inspecting the blades by repelling down a 3MW Alstom turbine undergoing testing at NREL's National Wind Technology Center (NWTC) in Boulder, Colorado. (Photo by

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July 30, 2013 - Lee Jay Fingersh, David Simms, and Steve Sawyer stand atop a CART wind turbine at the National Wind Technology Center. (Photo by Brian Smith / NREL).

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July 30, 2013 - Brian Smith, David Simms, and Steve Sawyer stand atop a CART wind turbine at the National Wind Technology Center. (Photo by Lee Jay Fingersh, NREL)

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July 30, 2013 - Brian Smith, David Simms, and Steve Sawyer stand atop a CART wind turbine at the National Wind Technology Center. (Photo by Lee Jay Fingersh, NREL)

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April 20, 2013 - A NREL employee's daughter smiles in front of the turbines at the National Wind Technology Center. (Photo by Suzanne Tegen / NREL)

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April 20, 2013 - A NREL employee's daughter points at the turbines while in her mother's arms at the National Wind Technology Center. (Photo by Suzanne Tegen / NREL)

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April 20, 2013 - A NREL employee's daughter spins in front of the turbines at the National Wind Technology Center. (Photo by Suzanne Tegen / NREL)

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April 20, 2013 - A NREL employee's daughter reaches for the turbines at the National Wind Technology Center. (Photo by Suzanne Tegen / NREL)

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April 12, 2013 - The Kelvin–Helmholtz instability (after Lord Kelvin and Hermann von Helmholtz can occur when there is velocity shear in a single continuous fluid, or where there is a velocity difference across the interface between two fluids. An exam

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March 30, 2013 - (L-R) Siemens Matt Brzezski, left and NREL Director Dan Arvizu discuss the wind technology from the nacelle of a Siemens 2.3 MW, 80 meter wind turbine at NREL's National Wind Technology Center (NWTC) in Boulder County, Colorado. (Phot

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March 30, 2013 - Siemens 2.3 MW, 80 meter wind turbine at NREL's National Wind Technology Center (NWTC) in Boulder County, Colorado. (Photo by Dennis Schroeder / NREL)

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March 30, 2013 - Siemens employee, Eric Eggleston, left, NREL Director Dan Arvizu, center, and Siemens employee Israel Garay, in the nacelle of a Siemens 2.3 MW, 80 meter wind turbine at NREL's National Wind Technology Center (NWTC) in Boulder County, Co

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March 30, 2013 - (L-R) U.S. Senator Mark Udall and NREL Director Dan Arvizu discuss the NWTC technology from the nacelle of a Siemens 2.3 MW, 80 meter wind turbine at NREL's National Wind Technology Center (NWTC) in Boulder County, Colorado. (Photo by De

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March 30, 2013 - (L-R) U.S. Senator Mark Udall NREL Director Dan Arvizu and Siemens Israel Garay discuss the wind technology from the nacelle of a Sieman's 2.3 MW, 80 meter wind turbine at NREL's National Wind Technology Center (NWTC) in Boulder County,

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March 30, 2013 - U.S. Senator Mark Udall checks out the view from the nacelle of a Siemens 2.3 MW, 80 meter wind turbine at NREL's National Wind Technology Center (NWTC) in Boulder County, Colorado. (Photo by Dennis Schroeder / NREL)

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March 30, 2013 - (L-R) U.S. Senator Mark Udall and NREL Director Dan Arvizu discuss the technology of the NWTC from the nacelle of a Siemens 2.3 MW, 80 meter wind turbine at NREL's National Wind Technology Center (NWTC) in Boulder County, Colorado. (Photo

 
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