Leadership Change Announced at NiSource Gas Transmission & Storage

HOUSTON and MERRILLVILLE, Ind., Sept. 1, 2011 /PRNewswire/ — NiSource Inc.
(NYSE: NI) President & CEO Robert C. Skaggs Jr. today announced a leadership
change at NiSource Gas Transmission and Storage (NGT&S) following the
announcement by Executive Vice President and Group CEO Christopher A. Helms that
he has decided to retire from the company.

(Photo: http://photos.prnewswire.com/prnh/20110901/DE61641 )

Skaggs said that, effective immediately, Jimmy D. Staton, a NiSource executive
with an extensive background in the natural gas business, will assume
responsibility for leading the company’s NGT&S units, which include Columbia Gas
Transmission LLC, Columbia Gulf Transmission Co. and Crossroads Pipeline Co.
Staton also will be responsible for NiSource Energy Ventures, which includes the
company’s midstream business, as well as the company’s partnership interests,
Millennium Pipeline and Hardy Storage Co.

Staton currently serves as executive vice president and group CEO of NiSource’s
Indiana gas and electric utility business, which includes Northern Indiana
Public Service Company (NIPSCO), as well as the company’s Gas Distribution
business unit. With this change, Staton continues to have responsibility for
NiSource’s Indiana utility business, while Skaggs assumes responsibility for
NiSource’s gas distribution business.

Helms has led NGT&S since 2005, helping position the company to pursue an array
of growth and expansion investment opportunities.

“Chris brought a strong, market-driven focus to our pipeline and storage
business, helping better position our company to pursue a wide array of
attractive, investment-driven growth initiatives,” Skaggs said. “I join our
entire team in thanking Chris for his contributions and wishing him well.”

“I am tremendously proud of our team’s accomplishments at NGT&S, and deeply
appreciative of the opportunity to work with such a talented and dedicated group
of people,” Helms said. “Although my work is done, I know NGT&S is poised to
deliver even more outstanding results for our shareholders, customers and the
communities we serve.”

Commenting on Staton’s appointment, Skaggs noted that, “Jimmy brings to this
role a strong track record of advancing key commercial, regulatory and
infrastructure enhancement strategies. I’m confident that he and the NGT&S team
will continue to develop collaborative and creative solutions that benefit our
customers, our team and NiSource as a whole.”

Focus on NGT&S Growth Agenda

In his new role, Staton will focus on advancing the NGT&S strategy to:

— Deliver customer value and earnings growth by leveraging NiSource’s
strategic asset base, including the company’s strong footprint in shale
production areas
— Enhance system reliability and integrity
— Improve customer focus and overall stakeholder engagement
— Strengthen organizational capability

Staton reports to Skaggs and serves as a member of NiSource’s executive council.
He

began his energy industry career as a petroleum engineer at the Federal Energy
Regulatory Commission. After leaving the public sector, Staton held several
rate, regulatory and strategic planning positions with Arkla Energy Resources
and Consolidated Natural Gas Company. In 2000, Staton was named Senior Vice
President, Electric Delivery for Dominion Resources Inc., and later became
Senior Vice President, Delivery Operations.

Staton joined NiSource in 2008 as Executive Vice President and Group CEO for the
company’s Gas Distribution business, and assumed responsibility for the
company’s Indiana gas and electric operations in 2010. He holds professional
memberships with a number of associations, including the American Gas
Association and the Southern Gas Association. He earned a B.S. degree in
Petroleum Engineering from Louisiana State University in 1983.

About NiSource

NiSource Inc. (NYSE: NI), based in Merrillville, Ind., is a Fortune 500 company
engaged in natural gas transmission, storage and distribution, as well as
electric generation, transmission and distribution. NiSource operating companies
deliver energy to 3.7 million customers located within the high-demand energy
corridor stretching from the Gulf Coast through the Midwest to New England.
Together, NiSource’s gas transmission and storage companies operate a
15,000-mile network of natural gas pipelines, 37 storage fields and serve some
of the nation’s largest and fastest-growing energy markets in the Northeast,
Midwest and Mid-Atlantic regions. Information about NiSource and its
subsidiaries is available via the Internet at www.nisource.com. NI-F

SOURCE NiSource Inc.