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Two of the world's largest state-of-the-art drivetrain test facilities are now open for business: the Wind Turbine Drivetrain Testing Facility at the Clemson University Restoration Institute in South Carolina and the 5-megawatt (MW) dynamometer at the U.S. Department of Energy's (DOE) National Wind Technology Center (NWTC) at the National Renewable Energy Laboratory (NREL) in Colorado. Funded in part by grants from DOE under the American Recovery and Reinvestment Act, the new facilities will accelerate the development and deployment of next-generation wind energy technologies for both offshore and land-based applications.

Located on a former Navy base with easy access to both rail and deepwater transport, the Clemson facility in North Charleston is ideal for testing the larger multi-megawatt wind turbines that both the United States and international manufacturers are developing for offshore applications. This facility is equipped with 7.5-MW and 15-MW dynamometers. These dynamometers enable industry and testing agencies to verify the performance and reliability of drivetrain prototypes and commercial machines by simulating operating field conditions in a laboratory environment. Verifying a system's performance before it is commercially deployed reduces the risk for both the manufacturer and systems operator.

In addition to testing the performance of the drivetrains, Clemson is using the facility's electrical infrastructure to build a 15-MW, ‘hardware-in-the-loop’ grid simulator. The grid simulator will mimic real-world circumstances—such as wide-area power disruptions, frequency fluctuations, voltage drops, cascading accidents, and cyber or physical attacks—to determine the effects of the wind turbine on the utility grid and the grid on the wind turbine. The Clemson facility will also expedite collaboration among faculty, students, and private partners to create cross-cutting teams capable of solving major challenges prior to market introduction.

The 7.5-MW dynamometer at the Clemson drivetrain facility will be operational by winter 2013–2014, and the 15-MW dynamometer will be operational in 2014. The grid simulator is expected to begin commissioning this year and be operational during the first quarter of 2014.

DOE's new test facility at the NWTC offers industry the capability to perform accelerated tests on wind turbine drivetrains with capacity ratings of up to 5 MW. In addition, industry partners that use the facility gain access to on-site engineers with more than three decades of engineering experience. The new 5-MW dynamometer can be connected either directly to the grid or to a controllable grid interface (CGI), providing system engineers with a better understanding of how wind turbines react to grid disturbances. The CGI, in turn, can also be connected either to wind turbines in the field at the NWTC or to electronic and mechanical storage devices undergoing a test. It is designed to work with all types of generators and inverters used in wind turbines, photovoltaic systems, and energy storage systems. NREL's CGI tests wind turbines off-line from the grid, verifies compliance with standards, and provides grid operators with the performance information they need for a fraction of the time and cost it would take to test the turbine in the field.

The Wind Program is committed to developing and deploying a portfolio of innovative technologies for clean, domestic power generation to support an ever-growing industry.

The Office of Energy Efficiency and Renewable Energy (EERE) success stories highlight the positive impact of its work with businesses, industry partners, universities, research labs, and other entities.

Project Overview

Positive Impact

New test facilities for wind technologies. Two state-of-the-art wind testing facilities accelerate development and deployment of wind energy technologies.


South Carolina, Colorado


Clemson University, National Renewable Energy Laboratory

Clean Energy Sector

Renewable electricity generation