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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)

Kelvin-Helmho..

Kelvin-Helmholtz instability cloud formation

April 12, 2013 - The Kelvinâ€“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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March 30, 2013 - (L-R) U.S. Senator Mark Udall and NREL Director Dan Arvizu check out the view of the Flat Irons 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. (Pho

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

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March 30, 2013 - NREL Director Dan Arvizu in 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 - U.S. Senator Mark Udall visits 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 - U.S. Senator Mark Udall visits 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 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 check out the view 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 by

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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 - NREL Director Dan Arvizu, left, Siemens employees Israel Garay, center, and Eric Eggleston, right, in the nacelle of a Siemens 2.3 MW, 80 meter wind turbine at NREL's National Wind Technology Center (NWTC) in Boulder County, Colorado. (P

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March 30, 2013 - U.S. Senator Mark Udall visits 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) NREL Director Dan Arvizu, U.S. Senator Mark Udall, Siemens employees Matt Brzezinsky and Eric Eggleston 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) NREL Director Dan Arvizu, U.S. Senator Mark Udall, Siemens employees Matt Brzezinsky and Mike Seil in the nacelle of a Siemens 2.3 MW, 80 meter wind turbine at NREL's National Wind Technology Center (NWTC) in Boulder County, Colorad

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

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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 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 - NREL Director Dan Arvizu in the nacelle of a Siemens 2.3 MW, 80 meter wind turbine at NREL's National Wind Technology Center (NWTC) in Boulder County, Colorado. Behind him is Seiman's employee Israel Garay. (Photo by Dennis Schroeder / NR

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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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February 17, 2010 - Lindsay Ranch with NWTC in the background. (Photo by Tom Ryon / NREL).

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January 23, 2013 - Side view of the NWTC 5MW Dynamometer Test Facility. (Photo by Mark McDade / NREL)

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January 16, 2013 - Interior of the NWTC 5MW Dynamometer Test Facility. (Photo by Jim Green / NREL)

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October 23, 2012 - The Sodar system is a 'Triton' sodar system, made by Second Wind. It uses sound beams to measure wind speeds above the system at heights up to the wind turbine hubs, and beyond. It's frequently used as a replacement for meteorological

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February 9, 2011 - The Sodar system is a 'Triton' sodar system, made by Second Wind. It uses sound beams to measure wind speeds above the system at heights up to the wind turbine hubs, and beyond. It's frequently used as a replacement for meteorological

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December 17, 2012 - The Sodar system is a 'Triton' sodar system, made by Second Wind. It uses sound beams to measure wind speeds above the system at heights up to the wind turbine hubs, and beyond. It's frequently used as a replacement for meteorological

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October 17, 2012 - The Sodar system is a 'Triton' sodar system, made by Second Wind. It uses sound beams to measure wind speeds above the system at heights up to the wind turbine hubs, and beyond. It's frequently used as a replacement for meteorological

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February 12, 2013 - The lidar systems are 'Galion' lidar systems, supplied by Sgurr Energy. They use laser beams to measure the wind speed, in this case around the NWTC's meteorological towers. They are also used as replacements or supplements for meteoro

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February 22, 2013 - The lidar systems are 'Galion' lidar systems, supplied by Sgurr Energy. They use laser beams to measure the wind speed, in this case around the NWTC's meteorological towers. They are also used as replacements or supplements for meteoro

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February 14, 2013 - The lidar systems are 'Galion' lidar systems, supplied by Sgurr Energy. They use laser beams to measure the wind speed, in this case around the NWTC's meteorological towers. They are also used as replacements or supplements for meteoro

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