Duke Energy's Gaston County research project wins top industry award

Thu Feb 7, 2013 11:00am EST

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CHARLOTTE, N.C.,  Feb. 7, 2013  /PRNewswire/ -- A Duke Energy (NYSE: DUK)
installation in  Gaston County, N.C., has been named one of the top projects of
the year by the editors of POWERGRID International magazine and PennWell Corp.

(Logo:  http://photos.prnewswire.com/prnh/20040414/DUKEENERGYLOGO  )

Duke Energy's battery installation at the Rankin Substation in  Mount Holly  was
named Project of the Year for integrating renewable energy into the grid. The
award was presented at the recent DistribuTECH Conference and Exhibition in  San

At the Rankin Substation, a 402-kilowatt/282-kilowatt-hour sodium nickel
chloride battery system is being used to smooth out large minute-by-minute peaks
and valleys in production from a nearby 1.2-megawatt solar facility at a local
industrial complex.

"As clouds roll by, solar output can go from 100 percent to practically zero,"
said  Dan Sowder, Duke Energy's senior project manager. "With enough solar, that
could disrupt the electrical grid. The Rankin Substation project is testing
whether our battery setup can smooth out the fluctuations caused by solar's
intermittent output."

Duke Energy is a leader at incorporating battery technology in the electric
grid, with installations in  Texas,  Indiana  and  North Carolina. The  Rankin 
project demonstrates how batteries can directly support the integration of solar
onto the grid. Project partners include:  Italy-based FIAMM Energy Storage
Solutions, who provided the batteries, and  Chicago-based S&C Electric Company.

"We have to explore every avenue to make sure the grid can handle the influx of
more renewables," said Sowder. "We want to see if a central battery installation
at a substation can support the grid. In the future, there may be neighborhoods
full of rooftop solar. We need to be ready for that."

Since the end of 2011, the battery control system has been adjusted continuously
to develop the most effective way to use storage for solar integration.

"It's satisfying to have this project and our team recognized as the best in the
nation," added Sowder. "Many areas of Duke Energy came together to tackle a
research project that may pay dividends for our customers in the future."

Headquartered in  Charlotte, N.C., Duke Energy is a Fortune 250 company traded
on the New York Stock Exchange under the symbol DUK.  More information about the
company is available on the Internet at duke-energy.com.

CONTACT:   Randy Wheeless
Phone:  704-382-8379

SOURCE  Duke Energy

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