NiSource Schedules Earnings Release and Conference Call for Oct. 28

MERRILLVILLE, Ind., Oct. 19, 2011 /PRNewswire/ — NiSource Inc. (NYSE: NI) today
announced the company will host an analyst conference call at 9 a.m. ET (8 a.m.
CT) on Friday, Oct. 28, 2011, to review its third quarter 2011 financial results
and to provide a general business update.

NiSource will release its third quarter earnings before U.S. financial markets
open on Oct. 28.

All interested parties may listen to the conference call live on Oct. 28, by
logging onto the NiSource website at www.nisource.com. A link on the home page
will provide access to the audio webcast.

A replay of the call will be available beginning by noon ET on Oct. 28, through
Nov. 4. To access the recording, call 1-888-286-8010 and enter pass code
32462922. For international participants to hear the replay, please dial
1-617-801-6888 and enter the same pass code as above, 32462922. A recording of
the call also will be archived on the NiSource website.

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.