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Do “forests” of wind turbines offer diminishing returns?


September 1, 2015
By Anthony Capkun


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August 31, 2015 – As wind turbines proliferate, researchers at the University of Kansas are looking at how these “forests of turbines” affect the wind itself: what happens to the wind when a larger number of wind turbines removes increasingly more of the energy of atmospheric motion?

Atmospheric science professors Nate Brunsell and David Mechem in KU’s Department of Geography are co-authors of a new study by an international research group that evaluated the effects of large wind farms on atmospheric flow and its implications for how much renewable energy the turbines can generate.

“Wind turbines generate electricity by removing energy from the wind, so a larger number of wind turbines should result in a slowdown of the winds in the lower atmosphere,” Mechem said.

The researchers quantified this phenomenon in numerical simulations by applying a sophisticated model normally used for weather forecasting to one of the windiest regions of the United States.

The team found that a slowdown effect triggered by wind turbines is substantial for large wind farms and results in proportionally less renewable energy generated for each turbine versus the energy that would be generated from an isolated wind turbine.

While the researchers stress that no current or planned wind farm approaches the size or concentration that would cause the slowdown effect, their results suggest the phenomenon tied to large wind farms needs to be accounted for in future planning of wind energy.

“When just a few wind turbines are installed, each additional turbine results in a similar increase in electricity generated, as you might expect,” Brunsell said. However, when a substantial number of turbines are installed over a small area, the amount of electricity generated is no longer governed by simple multiplication, according to the researchers.

“Instead, because the turbines extract energy from the wind, additional turbines will each generate less and less electricity,” Mechem said.

The team’s simulations estimate this slowdown effect results in a practical upper limit of 1 MW/sq. km that can be generated. Current wind farms are operating well below this generation limit, but the authors argue this slowdown effect needs to be accounted for, particularly when comparing different sources of renewable energy.