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

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

PR Newswire

CHARLOTTE, N.C., Feb. 7, 2013

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 Diego.

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

"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

"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
24-Hour: 800-559-3853

SOURCE Duke Energy

Website: http://www.duke-energy.com
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