NiSource Issues 2010 Sustainability Report

MERRILLVILLE, Ind., June 6, 2011 /PRNewswire/ — NiSource (NYSE: NI) today
issued its 2010 Sustainability Report, which provides an in-depth look at the
company’s progress toward building sustainable value through customer-focused
energy solutions, environmental stewardship and community involvement.

“We’re committed to building a legacy of sustainable economic growth, social
responsibility and environmental stewardship,” NiSource President and CEO Robert
C. Skaggs, Jr.said. “This report highlights efforts across all our businesses to
generate sustainable value for our customers – and all of our stakeholders -
through a balanced, disciplined and forward-looking approach.”

2010 Sustainability Report Performance Highlights:

Customer-Focused Energy Solutions
NiSource invested more than $900 million in capital improvements, ensuring the
safety, reliability and operational efficiency of the energy delivery
infrastructure its customers rely on.

Environmental Stewardship
NiSource exceeded its carbon intensity reduction target by investing in
infrastructure and innovation of operations. At the end of 2010, its greenhouse
gas intensity had been reduced by more than 8 percent from 2001. The company’s
goal was a 7 percent reduction by 2012.

Building Strong Stable Communities
NiSource companies provided a record level of more than $6.8 million in
charitable donations to local, regional and national organizations in 2010.

Skaggs continued, “In the end, our goal is simple: to build a cleaner, more
efficient and affordable energy future. Going forward, we will continue to focus
on and improve our sustainability efforts and identify areas for continuous
improvement.”

NiSource’s 2010 Sustainability Report, available at http://www.nisource.com, was
produced using the Global Reporting Initiative G3 Reporting Guidelines, a
leading industry framework for measuring corporate sustainability initiatives
and progress. NiSource self declares – supported with third-party assurance from
CH2M HILL- that this report meets the requirements of GRI Application Level B+.

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 3.8 million customers located within the high-demand energy
corridor stretching from the Gulf Coast through the Midwest to New England.
Information about NiSource and its subsidiaries is available via the Internet at
www.nisource.com. NI-F

SOURCE NiSource Inc.