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U.S. Constellation unit works to tame wily wind power 

Constellation Energy Group is looking for ways to tame plentiful but unpredictable electricity supplies from wind, a carbon-free resource that supporters say could supply 20 percent of the U.S. power needs by 2030.

Texas now leads the nation in wind generation capacity, as entrepreneurs including billionaire oil investor T. Boone Pickens join others in a rush to build turbines on the state’s vast, wind-swept prairies.

But for the nation’s power grid operators, channeling these new supplies can be a headache, because wind supplies are as changeable and unpredictable as the weather itself. Plants powered by natural gas can be switched on and off at a moment’s notice to respond to the demands of the grid, but wind cannot.

In an attempt to discipline the wind, Constellation Energy Control and Dispatch, based in Houston, wants to provide new services to balance unpredictable wind production at a wind farm in the U.S. Northwest.

“We want to isolate the wind farm and use the tools we have to manage its volatility,” said J.T. Thompson, a Constellation vice president.

If approved by the Western Electric Coordinating Council, the unit of Baltimore-based Constellation would join 35 other entities that constitute the western grid, including the Bonneville Power Administration (BPA).

Each so-called balancing authority is required to provide round-the-clock models that balance energy needs with available supply, and offer back-up plans if power plants shut unexpectedly.

With complex computer programs and an “integration desk,” Constellation plans to keep tabs on each turbine, supplying much more production detail to the grid.

While wind producers want the grid to accept as many megawatts as spinning turbines can generate, Constellation will use computer systems and back-up generation to keep wind output strictly in line with the forecast supplied earlier to the grid.

“That is not an easy thing with wind,” Thompson said. “Traditional systems have not been built to manage that kind of variability.”

At 6,700 megawatts, more than one-third of the nation’s wind generation is in the West, according to the American Wind Energy Association, a trade group.

California, Oregon and Washington are adding wind farms and grid operators are looking at changes to accommodate the new resource.

BPA is reviewing the hydropower supply in the Northwest as additional wind generation and rising electric use strains the hydro network, the agency said on its website.

By Eileen O’Grady

(Editing by Chris Baltimore, editing by Matthew Lewis)


14 July 2008

This article is the work of the source indicated. Any opinions expressed in it are not necessarily those of National Wind Watch.

The copyright of this article resides with the author or publisher indicated. As part of its noncommercial educational effort to present the environmental, social, scientific, and economic issues of large-scale wind power development to a global audience seeking such information, National Wind Watch endeavors to observe “fair use” as provided for in section 107 of U.S. Copyright Law and similar “fair dealing” provisions of the copyright laws of other nations. Send requests to excerpt, general inquiries, and comments via e-mail.

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