Duke Energy and Xtreme Power Announce Completion of Notrees Energy Storage Project

  Duke Energy and Xtreme Power Announce Completion of Notrees Energy Storage

Largest Battery System Installed by Xtreme Power

PR Newswire

CHARLOTTE, N.C. and AUSTIN, Texas, Jan. 23, 2013

CHARLOTTE, N.C. and AUSTIN, Texas, Jan. 23, 2013 /PRNewswire/ --Duke Energy,
the largest electric power holding company in the United States, and Xtreme
Power, a world leader in real-time power management and energy storage
solutions, today announced the commencement of operations at the Notrees
Energy Storage unit in western Texas.

The integrated facility at Notrees provides both environmentally friendly and
flexible capacity to the Electric Reliability Council Of Texas (ERCOT), which
operates the electrical grid in Texas and manages 75% of the deregulated
market in the state.

The system is part of Duke Energy's Notrees 153 MW Windpower Project. The 36MW
Battery Storage system is capable of deploying fast-acting reserves to support
ERCOT grid reliability and helping the System Operator maintain supply and
demand balance with near-instantaneous feedback of frequency changes or other
unexpected events. In addition to other energy management services, the
storage unit supports ultimate wind farm performance as it can absorb power
from the wind farm during times of low demand or high curtailment and release
power when it is most beneficial to the market.

Xtreme Power's innovative control system, XACT, will manage real-time
performance and response of the system in response to site and grid

"Great partnerships with Xtreme Power, ERCOT and the U.S. Department of Energy
on this project are giving us insights about this important and potentially
game-changing technology," said Duke Energy Renewables President Greg Wolf.
"Energy storage will benefit our renewables business, our customers and the
energy sector as a whole as we study the performance of the system and begin
to realize its full potential."

This project marks the eighth energy storage project installed by Xtreme Power
over the past year. Xtreme Power's operational experience is unmatched in the
energy storage industry, serving more than eleven customers and remotely
monitoring over 250,000 hours of operations.

"We are proud to collaborate with Duke Energy to announce the complete
installation of the Notrees Energy Storage unit, where the available power
output makes this the largest facility of its kind," said Alan Gotcher, Chief
Executive Officer of Xtreme Power. "Our XACT control system perfectly matches
the needs of this project as it enables safe and reliable energy storage
solutions at a low cost for grid applications."

About Xtreme Power

Founded in November 2004, Xtreme Power designs, engineers, installs, and
monitors integrated energy storage and power management systems for
Independent Power Producers, Transmission and Distribution Utilities, and
Commercial & Industrial End Users, among others. Xtreme Power's technology
delivers on its promise to solve complex grid challenges and our customers
rely upon our staff of over 100 power systems engineers and professionals to
design and implement a solution specific to each customer's need.

Xtreme Power is a privately held company and has raised in excess of $80
million since its founding. Current investors include SAIL Capital Partners,
Bessemer Venture Partners, The Dow Chemical Company, BP and Fluor, among
others. These multimillion-dollar investments have yielded tremendous growth
and accolades, including the following: Bloomberg 2012 New Energy Pioneer
Award, R&D 100 Award, one of 4,000 companies selected for the Global Cleantech
100 Award, and most recently honored by Inc. Magazine as the 15^th fastest
growing company in the nation. For more information, please visit

About Duke Energy Renewables

Duke Energy Renewables, part of Duke Energy's Commercial Businesses, is a
leader in developing innovative wind and solar energy generation projects for
customers throughout the United States. The company's growing portfolio of
commercial renewable assets includes 15 wind farms and 14 solar farms in
operation in nine states, totaling more than 1,700 megawatts in
electric-generating capacity. Learn more at www.duke-energy.com/renewables.
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: www.duke-energy.com.

SOURCE Xtreme Power

Website: http://www.xtremepower.com
Contact: For Duke Energy: Tammie McGee, Duke Energy, +1-980-373-8812,
tammie.mcgee@duke-energy.com; For Xtreme Power: Mavis Baah and Gregory
Vistica, Washington Media Group, +1-202-628-1280, mbaah@washingtonmedia.com
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