Exhibit 99.1

		801 E. 86th Avenue Merrillville, IN 46410

August 2, 2011

FOR ADDITIONAL INFORMATION

Media Mike Banas Communications Manager (219) 647-5581 mbanas@nisource.com		Investors Randy Hulen Managing Director, Investor Relations (219) 647-5688 rghulen@nisource.com

NiSource Reports Second Quarter 2011 Results

	•		Earnings in line with 2011 guidance
	•		Settlement filed in Indiana electric rate case
	•		Infrastructure enhancements, growth investments on track

MERRILLVILLE, Ind. — NiSource Inc. (NYSE: NI) today announced net operating earnings from continuing operations (non-GAAP) of $45.6 million, or $0.17 per share for the three months ended June 30, 2011, compared to $37.0 million, or $0.13 per share for the second quarter of 2010. Operating earnings for the quarter (non-GAAP) were $162.2 million compared to $154.0 million for the same period in 2010.

On a GAAP basis, NiSource reported income from continuing operations for the three months ended June 30, 2011, of $39.5 million, or $0.14 per share, compared with $28.0 million, or $0.10 per share in the same period a year ago. Operating income was $163.3 million for the second quarter of 2011 compared with $139.2 million in the year-ago period. Schedules 1 and 2 of this news release contain a reconciliation of net operating earnings and operating earnings to GAAP.

“NiSource delivered another quarter of solid financial and operational performance, punctuated by significant accomplishments involving nearly all aspects of our business plan,” NiSource President and Chief Executive Officer Robert C. Skaggs Jr. said. “From the settlement of our electric rate case in Indiana, to the achievement of key regulatory, commercial and infrastructure milestones across each of our businesses, our team continues to create innovative energy solutions for our customers and sustainable value for shareholders.”

Skaggs noted that NiSource remains on track to deliver net operating earnings from continuing operations in line with its 2011 outlook of $1.25 to $1.35 per share (non-GAAP). He also highlighted a series of recent business accomplishments across the company, including:

Indiana electric rate case settlement

On July 18, NiSource’s Northern Indiana Public Service Company (NIPSCO) filed a broad-based settlement agreement which, if approved by the Indiana Utility Regulatory Commission (IURC), would resolve the company’s Nov. 2010 electric base rate case. A product of months of extensive discussions with its customers and key regulatory stakeholders, the settlement provides NIPSCO with the foundation to make ongoing investments in northern Indiana’s energy infrastructure to help fuel job creation and economic growth and to earn a reasonable return on its investment for shareholders on a sustainable basis.

“Working collaboratively with stakeholders, the settlement represents a balanced agreement that supports NIPSCO’s ability to provide Indiana families, businesses and industries with the affordable, reliable and environmentally sustainable power they need now and for the future,” Skaggs said.

Pending IURC approval, NIPSCO anticipates that new rates could be effective in late 2011 or early 2012.

NIPSCO’s electric operations also continue to make progress on a variety of new customer programs and environmental initiatives.

	•		On July 13, the company received approval from the IURC to significantly improve NIPSCO’s ability to purchase customer-generated electricity from renewable energy projects. The program, supported by consumer and environmental groups, also allows customers to generate more of their own electricity using renewable energy to reduce their utility costs.
	•		On July 27, the IURC also approved NIPSCO’s request for new electric energy efficiency programs for its electric customers. Programs include appliance recycling, commercial and industrial efficiency project incentives and expanded energy education.
	•		Construction also remains on schedule for a Flue Gas Desulfurization unit at NIPSCO’s Schahfer generating station. This clean-air project is part of the company’s significant environmental improvements at its electric generating stations — an investment of between $570 million and $840 million planned over the next eight years.

Pipeline and storage growth initiatives

NiSource Gas Transmission & Storage (NGT&S) continues to leverage its strategic asset base and geographic footprint in the natural gas-rich Marcellus Shale production area to position itself for ongoing growth.

In the Marcellus region, NGT&S completed its Southern Appalachian and Clendenin projects during the second quarter, providing more than 180,000 dekatherms per day of contracted firm transportation capacity for its customers. Other Marcellus-related projects in progress include the Rimersburg Expansion in central Pennsylvania, the Smithfield project in West Virginia and the Line WB Expansion in Virginia and Kentucky. These producer-driven projects, of which a significant portion are fully subscribed with long-term contracts or binding precedent agreements, will add up to 525,000 dekatherms per day of firm transportation.

As part of its ongoing strategy to exploit its Marcellus area pipeline and storage asset position, NGT&S recently announced the appointment of several key new leaders. They include veteran energy leader Joe Blount who will serve as president of NiSource Energy Ventures. Blount’s responsibilities will include all of NGT&S’ midstream activities, its partnership interests in Millennium Pipeline and Hardy Storage Company, and a number of other related commercial activities. Among those reporting to Blount will be John Bonn, recently appointed as president of NiSource Midstream Services, which is focused on capitalizing on the company’s extensive opportunities in the Marcellus supply region.

“We’ve deepened our leadership ranks at NGT&S to continue to meet our aggressive targets for project origination, execution and earnings growth from investments across our system and, in particular, in the Marcellus Shale production area,” Skaggs said. “The team is aggressively developing and pursuing an inventory of low-risk, accretive infrastructure investments that meet the needs of our customers and provide long-term value for our shareholders.”

In addition to its supply-driven Marcellus development activities, NGT&S continues to actively develop infrastructure projects to serve new natural gas-fueled electric generation markets, involving both new generation facilities as well as coal conversion opportunities. For example, in May, Columbia Gas Transmission filed an application with the Federal Energy Regulatory Commission (FERC) to construct the pipeline infrastructure to serve Virginia Electric and Power Company’s planned 1,329 megawatt gas-fired generation facility in Warren County, Va. The project would provide approximately 250,000 dekatherms per day of long-term, firm transportation with an in-service date of mid-2014.

On the regulatory front, Columbia Gulf Transmission placed new rates into effect, subject to refund, on May 1, 2011, as part of its Nov. 2010 rate case filing with the FERC. Columbia Gulf and the parties to the case are actively engaged in settlement discussions to resolve the case.

Gas distribution infrastructure, regulatory programs

NiSource Gas Distribution (NGD) continues to advance its strategy of combining long-term infrastructure replacement and customer programs with complementary regulatory initiatives.

On July 1, Columbia Gas of Pennsylvania filed a partial settlement in the company’s base rate case filed on Jan. 14, 2011, with the Pennsylvania Public Utility Commission. Two items, including rate design for residential customers, will be resolved through a formal hearing process, and a recommendation is expected this month. If approved, the settlement will authorize a revenue increase of $17 million annually. A decision is expected, with new rates in effect, during the fourth quarter of this year.

NiSource’s gas distribution companies also remain on track with their extensive infrastructure modernization and replacement programs designed to ensure safe and reliable service. These include programs at Columbia Gas of Ohio, Columbia Gas of Pennsylvania, Columbia Gas of Massachusetts and Columbia Gas of Kentucky. In addition, Columbia Gas of Virginia has filed an application with its state commission to accelerate recovery of its infrastructure projects. All of these investments are part of NGDs more than $4 billion replacement program scheduled over the next 20 to 25 years.

Liquidity and financial management

In June, NiSource issued $400 million in 30-year notes as part of the company’s ongoing focus on enhancing its long-term financial strength and flexibility. The issuance takes advantage of the attractive interest rate environment and will be used to repay short-term bank borrowings under the company’s $1.5 billion revolving credit facility. Also in June, NiSource introduced a $500 million commercial paper program, which further diversifies the company’s short-term funding sources and is fully supported by the revolving credit facility.

“We remain committed to the principle of thoughtful and disciplined financial management,” Skaggs said. “This strategy has enabled us to strengthen our financial foundation and increase our ongoing capital expenditure levels to meet customer needs and deliver value to our shareholders.”

The company’s overall 2011 capital investment program amounts to approximately $1.1 billion, a level it expects to maintain or increase in the years ahead.

Second Quarter 2011 Operating Earnings — Segment Results (non-GAAP)

NiSource’s consolidated operating earnings (non-GAAP) for the quarter ended June 30, 2011, were $162.2 million, compared to $154.0 million in the second quarter of 2010. Refer to Schedule 2 for the items included in 2011 and 2010 GAAP operating income but excluded from operating earnings.

Operating earnings for NiSource’s business segments for the quarter ended June 30, 2011 are discussed below.

NiSource Gas Distribution reported operating earnings for the current quarter of $48.7 million compared to $35.9 million in the second quarter of 2010. Net revenues, excluding the impact of trackers, increased by $0.4 million, primarily attributable to increased residential and commercial margins due to NIPSCO’s change from a volumetric-based rate design to one with a higher fixed charge. The new rate design provides a greater proportion of recovery through the monthly fixed customer charge for certain customer classes. Additionally, there was an increase in other regulatory and service programs largely due to new rates under Columbia Gas of Ohio’s approved infrastructure replacement program and rate cases at various other utilities. These increases in net revenues were partially offset by a decrease in off-system sales.

Operating expenses, excluding trackers, were $12.4 million lower than the comparable 2010 period primarily as a result of lower depreciation costs due to reduced depreciation rates. This decrease was partially offset by increases in employee and administrative expenses.

NiSource Gas Transmission and Storage reported operating earnings for the current quarter of $84.7 million compared to $74.9 million in the second quarter of 2010. Net revenues, excluding the impact of trackers, increased by $14.3 million, primarily attributable to an increase in demand margin revenue as a result of growth projects placed into service in the second half of 2010 and the impact of new Columbia Gulf rates, subject to refund, put into effect May 1, 2011.

Operating expenses, excluding the impact of trackers, increased $6.4 million from the comparable 2010 period due to increased employee and administrative expenses and depreciation.

Equity earnings increased $1.9 million primarily due to non-recurrence of 2010 hedge ineffectiveness charges for Millennium Pipeline, partially offset by Millennium’s higher current year interest costs resulting from its Aug. 2010 debt refinancing.

NiSource Electric reported operating earnings for the current quarter of $37.3 million compared to $48.3 million in the second quarter of 2010. Net revenues, excluding the impact of trackers, increased by $0.2 million primarily due to increased industrial usage and margins as a result of improved economic conditions partially offset by decreased residential and commercial margins.

Operating expenses, excluding the impact of trackers, increased by $11.2 million primarily attributable to higher electric generation costs due to an increase in outage durations and higher employee and administrative expenses.

Corporate and Other reported an operating earnings loss of $8.5 million for the current quarter compared to an operating earnings loss of $5.1 million in the second quarter of 2010.

Other Items

Interest expense decreased by $4.0 million due to the Nov. 2010 long-term debt maturity and the Dec. 2010 tender offer repurchase of long-term debt. The benefits were partially offset by incremental interest expense associated with the swap maturity in Nov. 2010, the issuance of long-term debt in Dec. 2010 and higher average short-term borrowings and rates.

Other-net reflected income of $0.6 million in 2011 compared to income of $2.6 million in 2010. The effective tax rate of net operating earnings was 33.3 percent compared to 36.4 percent for the same period last year.

Six-Month Period 2011 Operating Earnings — Segment Results (non-GAAP)

NiSource’s consolidated operating earnings (non-GAAP) for the six months ended June 30, 2011, were $557.1 million, compared to $559.1 million for the same period in 2010. Refer to Schedule 2 for the items included in 2011 and 2010 GAAP operating income but excluded from operating earnings.

Operating earnings for NiSource’s business segments for the six months ended June 30, 2011 are discussed below.

NiSource Gas Distribution reported operating earnings of $285.8 million compared to $270.6 million reported for the first six months of 2010. Net revenues, excluding the impact of regulatory trackers, decreased $8.0 million primarily attributable to a decrease in off-system sales and lower residential and commercial margins due to NIPSCO’s change from a volumetric-based rate design to one with a higher fixed charge. The new rate design provides a greater proportion of recovery through the monthly fixed customer charge for certain customer classes. These decreases were partially offset by an increase in other regulatory and service programs largely due to new rates under Columbia Gas of Ohio’s approved infrastructure replacement program and rate cases at various other utilities.

Operating expenses, excluding the impact of trackers, were $23.2 million lower than the comparable period in the prior year primarily due to lower depreciation costs as a result of reduced depreciation rates at NIPSCO and decreased uncollectible accounts. These decreases were partially offset by an increase in employee and administrative costs.

NiSource Gas Transmission and Storage reported operating earnings of $203.2 million versus operating earnings of $200.8 million in the first six months of 2010. Net revenues, excluding trackers, increased $14.0 million primarily attributable to an increase in demand margin revenue as a result of growth projects placed into service in the second half of 2010 and the impact of new Columbia Gulf rates put into effect, subject to refund, on May 1, 2011. These increases were partially offset by the recognition of revenue in the prior year related to a previously deferred gain for native gas and fees received from a contract buyout.

Operating expenses, excluding trackers, increased by $9.1 million primarily due to higher employee and administration expense, increased maintenance and outside service costs and higher depreciation.

Equity earnings decreased by $2.5 million primarily from Millennium Pipeline’s higher interest costs resulting from the Aug. 2010 debt refinancing partially offset by the non-recurrence of 2010 hedge ineffectiveness charges at Millennium.

NiSource Electric reported operating earnings of $79.2 million for the first six months of 2011, compared with operating earnings of $94.5 million for the prior year period. Net revenues, excluding trackers, increased by $9.1 million primarily due to increased industrial usage and margins as a result of improved economic conditions partially offset by decreased residential and commercial margins.

Operating expenses, excluding trackers, increased by $24.4 million due primarily to higher electric generation costs as a result of an increase in outage duration, a regulatory adjustment and higher employee and administrative expenses.

Corporate and Other reported an operating earnings loss of $11.1 million in the first six months of 2011, compared to an operating earnings loss of $6.8 million in the first six months of 2010.

Other Items

Interest expense decreased by $13.0 million due to the Nov. 2010 long-term debt maturity and the Dec. 2010 tender offer repurchase of long-term debt. The benefits were partially offset by incremental interest expense associated with the swap maturity in Nov. 2010, the issuance of long-term debt in Dec. 2010 and higher average short-term borrowings and rates.

The effective tax rate of net operating earnings was 34.2 percent compared to 35.9 percent for the same period last year.

Income from Continuing Operations (GAAP)

As noted above, on a GAAP basis, NiSource reported net income from continuing operations for the three months ended June 30, 2011, of $39.5 million, or $0.14 per share, compared with $28.0 million, or $0.10 per share, in the same period a year ago. Operating income was $163.3 million for the second quarter of 2011, compared with $139.2 million in the year-ago period.

On a GAAP basis, NiSource reported net income from continuing operations for the six months ended June 30, 2011, of $244.3 million, or $0.87 per share, compared with $225.4 million, or $0.81 per share last year. Operating income was $562.5 million for the first six months of 2011 versus $542.6 million in the year-ago period.

Refer to Schedule 1 for a complete list of the items included in 2011 and 2010 GAAP income from Continuing Operations but excluded from net operating earnings.

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

Forward-Looking Statements

This news release includes forward-looking statements within the meaning of Section 27A of the Securities Act of 1933, as amended, and Section 21E of the Securities Exchange Act of 1934, as amended. Those statements include statements regarding the intent, belief or current expectations of NiSource and its management. Although NiSource believes that its expectations are based on reasonable assumptions, it can give no assurance that its goals will be achieved. Readers are cautioned that the forward-looking statements in this news release are not guarantees of future performance and involve a number of risks and uncertainties, and that actual results could differ materially from those indicated by such forward-looking statements. Important factors that could cause actual results to differ materially from those indicated by such forward-looking statements include, but are not limited to, the following: weather; fluctuations in supply and demand for energy commodities; growth opportunities for NiSource’s businesses; increased competition in deregulated energy markets; the success of regulatory and commercial initiatives; dealings with third parties over whom NiSource has no control; actual operating experience of NiSource’s assets; the regulatory process; regulatory and legislative changes; the impact of potential new environmental laws or regulations; the results of material litigation; changes in pension funding requirements; changes in general economic, capital and commodity market conditions; and counter-party credit risk, and the matters set forth in the “Risk Factors” section in NiSource’s 2010 Form 10-K and subsequent reports on Form 10-Q, many of which risks are beyond the control of NiSource. NiSource expressly disclaims a duty to update any of the forward-looking statements contained in this release.

NiSource Inc.
Consolidated Net Operating Earnings (Non GAAP)
(unaudited)

		Three Months								Six Months
		Ended June 30,								Ended June 30,
(in millions,except per share amounts)		2011				2010				2011				2010
Net Revenues
Gas Distribution		$	502.7			$	471.7			$	1,870.3			$	1,812.0
Gas Transportation and Storage			307.3				264.3				710.3				634.8
Electric			346.6				339.3				692.4				657.6
Other			24.4				19.8				48.2				41.7
Gross Revenues			1,181.0				1,095.1				3,321.2				3,146.1
Cost of Sales (excluding depreciation and amortization)			417.7				349.8				1,503.5				1,330.8
Total Net Revenues			763.3				745.3				1,817.7				1,815.3
Operating Expenses
Operation and maintenance			366.5				338.9				712.1				668.7
Operation and maintenance — trackers			34.9				37.2				120.3				144.2
Depreciation and amortization			131.0				148.5				266.5				295.9
Depreciation and amortization — trackers			3.5				3.1				6.9				5.5
Other taxes			51.3				51.3				108.4				106.1
Other taxes — trackers			16.2				12.7				51.7				43.6
Total Operating Expenses			603.4				591.7				1,265.9				1,264.0
Equity Earnings in Unconsolidated Affiliates			2.3				0.4				5.3				7.8
Operating Earnings			162.2				154.0				557.1				559.1
Other Income (Deductions)
Interest expense, net			(94.4	)			(98.4	)			(184.2	)			(197.2	)
Other, net			0.6				2.6				3.9				5.2
Total Other Deductions			(93.8	)			(95.8	)			(180.3	)			(192.0	)
Operating Earnings From Continuing Operations
Before Income Taxes			68.4				58.2				376.8				367.1
Income Taxes			22.8				21.2				128.9				131.7
Net Operating Earnings from Continuing Operations			45.6				37.0				247.9				235.4
GAAP Adjustment			(6.1	)			(9.0	)			(3.6	)			(10.0	)
GAAP Income from Continuing Operations		$	39.5			$	28.0			$	244.3			$	225.4
Basic Net Operating Earnings Per Share from Continuing Operations			0.17				0.13				0.89				0.85
GAAP Basic Earnings Per Share from Continuing Operations			0.14				0.10				0.87				0.81
Basic Average Common Shares Outstanding			280.2				277.6				279.8				277.3

NiSource Inc.
Segment Operating Earnings (Non GAAP)
(unaudited)

		Three Months								Six Months
Gas Distribution Operations		Ended June 30,								Ended June 30,
(in millions)		2011				2010				2011				2010
Net Revenues
Sales Revenues		$	632.2			$	572.1			$	2,213.3			$	2,122.5
Less: Cost of gas sold			316.9				255.5				1,314.8				1,197.5
Net Revenues			315.3				316.6				898.5				925.0
Operating Expenses
Operation and maintenance			170.7				163.0				344.1				330.6
Operation and maintenance — trackers			16.7				21.8				85.5				112.0
Depreciation and amortization			43.6				63.4				86.6				125.9
Other taxes			19.4				19.7				44.8				42.2
Other taxes — trackers			16.2				12.8				51.7				43.7
Total Operating Expenses			266.6				280.7				612.7				654.4
Operating Earnings		$	48.7			$	35.9			$	285.8			$	270.6
GAAP Adjustment			(2.3	)			(17.4	)			2.2				(17.0	)
GAAP Operating Income		$	46.4			$	18.5			$	288.0			$	253.6

		Three Months								Six Months
Gas Transmission and Storage Operations		Ended June 30,								Ended June 30,
(in millions)		2011				2010				2011				2010
Net Revenues
Transportation revenues		$	174.7			$	161.7			$	374.4			$	358.9
Storage revenues			49.4				49.7				99.9				99.1
Other revenues			9.4				5.9				14.6				15.9
Net Operating Revenues			233.5				217.3				488.9				473.9
Operating Expenses
Operation and maintenance			88.1				83.2				168.5				159.9
Operation and maintenance — trackers		15.1					13.2				29.2				28.2
Depreciation and amortization		32.8					31.5				65.5				63.0
Other taxes			15.1				14.9				27.8				29.8
Total Operating Expenses			151.1				142.8				291.0				280.9
Equity Earnings in Unconsolidated Affiliates			2.3				0.4				5.3				7.8
Operating Earnings		$	84.7			$	74.9			$	203.2			$	200.8
GAAP Adjustment			—				—				—				—
GAAP Operating Income		$	84.7			$	74.9			$	203.2			$	200.8

NiSource Inc.
Segment Operating Earnings (Non GAAP)
(unaudited)

		Three Months								Six Months
Electric Operations		Ended June 30,								Ended June 30,
(in millions)		2011				2010				2011				2010
Net Revenues
Sales revenues		$	348.6			$	341.3			$	696.2			$	661.7
Less: Cost of sales			136.7				130.9				269.9				247.5
Net Revenues			211.9				210.4				426.3				414.2
Operating Expenses
Operation and maintenance			105.0				92.6				199.7				181.4
Operation and maintenance — trackers			3.1				2.2				5.6				4.0
Depreciation and amortization			49.9				49.8				105.5				99.7
Depreciation and amortization — trackers			3.5				3.1				6.9				5.5
Other taxes			13.1				14.4				29.4				29.1
Total Operating Expenses			174.6				162.1				347.1				319.7
Operating Earnings		$	37.3			$	48.3			$	79.2			$	94.5
GAAP Adjustment			2.5				1.3				3.8				0.2
GAAP Operating Income		$	39.8			$	49.6			$	83.0			$	94.7

		Three Months								Six Months
Corporate and Other Operations		Ended June 30,								Ended June 30,
(in millions)		2011				2010				2011				2010
Operating Loss		$	(8.5	)		$	(5.1	)		$	(11.1	)		$	(6.8	)
GAAP Adjustment			0.9				1.3				(0.6	)			0.3
GAAP Operating Loss		$	(7.6	)		$	(3.8	)		$	(11.7	)		$	(6.5	)

NiSource Inc.
Segment Volumes and Statistical Data

		Three Months								Six Months
Gas Distribution Operations		Ended June 30,								Ended June 30,
		2011				2010				2011				2010
Sales and Transportation (MMDth)
Residential			33.6				25.9				168.1				155.2
Commercial			26.7				23.2				104.3				96.0
Industrial			100.8				85.1				219.7				186.0
Off System			20.4				27.2				37.9				43.1
Other			0.2				0.2				0.5				0.7
Total			181.7				161.6				530.5				481.0
Weather Adjustment			2.3				13.2				(5.0	)			13.5
Sales and Transportation Volumes — Excluding Weather			184.0				174.8				525.5				494.5
Heating Degree Days			566				408				3,580				3,298
Normal Heating Degree Days			608				608				3,508				3,508
% Colder (Warmer) than Normal			(7	%)			(33	%)			2	%			(6	%)
Customers
Residential											3,005,423				3,003,035
Commercial											277,508				275,246
Industrial											7,648				7,707
Other											64				81
Total											3,290,643				3,286,069
		Three Months								Six Months
Gas Transmission and Storage Operations		Ended June 30,								Ended June 30,
		2011				2010				2011				2010
Throughput (MMDth)
Columbia Transmission			204.9				171.5				631.5				559.0
Columbia Gulf			263.1				197.1				507.1				400.0
Crossroads Gas Pipeline			5.6				5.6				10.7				13.7
Intrasegment eliminations			(147.7	)			(142.6	)			(300.3	)			(281.6	)
Total			325.9				231.6				849.0				691.1

NiSource Inc.
Segment Volumes and Statistical Data (continued)

		Three Months								Six Months
Electric Operations		Ended June 30,								Ended June 30,
		2011				2010				2011				2010
Sales (Gigawatt Hours)
Residential			784.4				810.5				1,640.2				1,657.5
Commercial			946.6				952.0				1,871.5				1,887.3
Industrial			2,325.7				2,111.0				4,768.1				4,141.8
Wholesale			200.2				172.3				267.3				305.7
Other			37.1				39.8				81.6				81.2
Total			4,294.0				4,085.6				8,628.7				8,073.5
Weather Adjustment			(33.5	)			(19.8	)			(51.0	)			(14.3	)
Sales — Volumes Excluding Weather impacts			4,260.5				4,065.8				8,577.7				8,059.2
Cooling Degree Days			258				277				258				277
Normal Cooling Degree Days			230				230				230				230
% Warmer (Colder) than Normal			12	%			20	%			12	%			20	%
Electric Customers
Residential											399,473				399,856
Commercial											53,861				53,656
Industrial											2,425				2,426
Wholesale											15				15
Other											737				742
Total											456,511				456,695

NiSource Inc.
Schedule 1 — Reconciliation of Net Operating Earnings to GAAP
(unaudited)

		Three Months								Six Months
		Ended June 30,								Ended June 30,
(in millions,except per share amounts)		2011				2010				2011				2010
Net Operating Earnings from Continuing Operations (Non-GAAP)		$	45.6			$	37.0			$	247.9			$	235.4
Items excluded from operating earnings:
Net Revenues:
Weather — compared to normal			0.2				(10.5	)			6.0				(10.1	)
Revenue adjustment			—				(5.7	)			—				(5.7	)
Unregulated natural gas marketing business			2.3				2.9				3.4				4.9
Operating Expenses:
Restructuring			—				0.1				—				(0.9	)
Unregulated natural gas marketing business			(1.4	)			(1.6	)			(3.4	)			(4.6	)
Gain/Loss on sale of assets and asset impairments			—				—				(0.6	)			(0.1	)
Total items excluded from operating earnings			1.1				(14.8	)			5.4				(16.5	)
Tax effect of above items			(0.4	)			5.8				(2.2	)			6.5
Other income tax adjustments — Indiana House Bill 1004			(6.8	)			—				(6.8	)			—
Total items excluded from net operating earnings			(6.1	)			(9.0	)			(3.6	)			(10.0	)
Reported Income from Continuing Operations — GAAP		$	39.5			$	28.0			$	244.3			$	225.4
Basic Average Common Shares Outstanding			280.2				277.6				279.8				277.3
Basic Net Operating Earnings Per Share from Continuing Operations		$	0.17			$	0.13			$	0.89			$	0.85
Items excluded from net operating earnings (after-tax)			(0.03	)			(0.03	)			(0.02	)			(0.04	)
GAAP Basic Earnings Per Share from Continuing Operations		$	0.14			$	0.10			$	0.87			$	0.81

NiSource Inc.
Schedule 2 — Adjustments by Segment from Operating Earnings to GAAP
For Quarter ended June 30,
(unaudited)

2011 (in millions)

						Gas
		Gas				Transmission								Corporate
		Distribution				and Storage				Electric				& Other				Total
Operating Earnings (Loss)		$	48.7			$	84.7			$	37.3			$	(8.5	)		$	162.2
Net Revenues:
Weather (compared to normal)			(2.3	)			—				2.5				—				0.2
Unregulated natural gas marketing business			—				—				—				2.3				2.3
Total Impact — Net Revenues			(2.3	)			—				2.5				2.3				2.5
Operating Expenses
Unregulated natural gas marketing business			—				—				—				(1.4	)			(1.4	)
Total Impact — Operating Expenses			—				—				—				(1.4	)			(1.4	)
Total Impact — Operating Income (Loss)		$	(2.3	)		$	—			$	2.5			$	0.9			$	1.1
Operating Income (Loss) — GAAP		$	46.4			$	84.7			$	39.8			$	(7.6	)		$	163.3

2010 (in millions)

						Gas
		Gas				Transmission
		Distribution				and Storage				Electric				Corporate				Total
Operating Earnings (Loss)		$	35.9			$	74.9			$	48.3			$	(5.1	)		$	154.0
Net Revenues:
Weather (compared to normal)			(11.7	)			—				1.2				—				(10.5	)
Revenue adjustment			(5.7	)			—				—				—				(5.7	)
Unregulated natural gas marketing business			—				—				—				2.9				2.9
Total Impact — Net Revenues			(17.4	)			—				1.2				2.9				(13.3	)
Operating Expenses
Restructuring			—				—				0.1				—				0.1
Unregulated natural gas marketing business			—				—				—				(1.6	)			(1.6	)
Total Impact — Operating Income (Loss)			—				—				0.1				(1.6	)			(1.5	)
Total Impact — Operating Income (Loss)		$	(17.4	)		$	—			$	1.3			$	1.3			$	(14.8	)
Operating Income (Loss) — GAAP		$	18.5			$	74.9			$	49.6			$	(3.8	)		$	139.2

NiSource Inc.
Schedule 2 — Adjustments by Segment from Operating Earnings to GAAP
For Six Months ended June 30,
(unaudited)

2011 (in millions)

						Gas
		Gas				Transmission								Corporate
		Distribution				and Storage				Electric				and Other				Total
Operating Earnings (Loss)		$	285.8			$	203.2			$	79.2			$	(11.1	)		$	557.1
Net Revenues:
Weather (compared to normal)			2.2				—				3.8				—				6.0
Unregulated natural gas marketing business			—				—				—				3.4				3.4
Total Impact — Net Revenues			2.2				—				3.8				3.4				9.4
Operating Expenses
Unregulated natural gas marketing business			—				—				—				(3.4	)			(3.4	)
Gain/(Loss) on sale of assets and asset impairments			—				—				—				(0.6	)			(0.6	)
Total Impact — Operating Expenses			—				—				—				(4.0	)			(4.0	)
Total Impact — Operating Income (Loss)		$	2.2			$	—			$	3.8			$	(0.6	)		$	5.4
Operating Income (Loss) — GAAP		$	288.0			$	203.2			$	83.0			$	(11.7	)		$	562.5

2010 (in millions)

						Gas
		Gas				Transmission
		Distribution				and Storage				Electric				Corporate				Total
Operating Earnings (Loss)		$	270.6			$	200.8			$	94.5			$	(6.8	)		$	559.1
Net Revenues:
Weather (compared to normal)			(10.9	)			—				0.8				—				(10.1	)
Revenue adjustment			(5.7	)			—				—				—				(5.7	)
Unregulated natural gas marketing business			—				—				—				4.9				4.9
Total Impact — Net Revenues			(16.6	)			—				0.8				4.9				(10.9	)
Operating Expenses
Restructuring			(0.3	)			—				(0.6	)			—				(0.9	)
Unregulated natural gas marketing business			—				—				—				(4.6	)			(4.6	)
Gain/(Loss) on sale of assets and asset impairments			(0.1	)			—				—				—				(0.1	)
Total Impact — Operating Expenses			(0.4	)			—				(0.6	)			(4.6	)			(5.6	)
Total Impact — Operating Income (Loss)		$	(17.0	)		$	—			$	0.2			$	0.3			$	(16.5	)
Operating Income (Loss) — GAAP		$	253.6			$	200.8			$	94.7			$	(6.5	)		$	542.6

NiSource Inc.
Consolidated Income Statement (GAAP)
(unaudited)

		Three Months Ended								Six Months Ended
		June 30,								June 30,
(in millions, except per share amounts)		2011				2010				2011				2010
Net Revenues
Gas Distribution		$	500.4			$	454.3			$	1,872.4			$	1,795.4
Gas Transportation and Storage			307.3				264.3				710.3				634.8
Electric			349.2				340.5				696.3				658.4
Other			71.4				112.0				181.5				441.2
Gross Revenues			1,228.3				1,171.1				3,460.5				3,529.8
Cost of Sales (excluding depreciation and amortization)			462.5				439.1				1,633.4				1,725.4
Total Net Revenues			765.8				732.0				1,827.1				1,804.4
Operating Expenses
Operation and maintenance			402.5				377.1				835.0				816.7
Depreciation and amortization			134.5				151.6				273.4				301.4
Impairment and loss on sale of assets, net			—				—				0.7				0.1
Other taxes			67.8				64.5				160.8				151.4
Total Operating Expenses			604.8				593.2				1,269.9				1,269.6
Equity Earnings in Unconsolidated Affiliates			2.3				0.4				5.3				7.8
Operating Income			163.3				139.2				562.5				542.6
Other Income (Deductions)
Interest expense, net			(94.4	)			(98.4	)			(184.2	)			(197.2	)
Other, net			0.6				2.6				3.9				5.2
Total Other Deductions			(93.8	)			(95.8	)			(180.3	)			(192.0	)
Income from Continuing Operations before Income Taxes			69.5				43.4				382.2				350.6
Income Tax Expense			30.0				15.4				137.9				125.2
Income from Continuing Operations			39.5				28.0				244.3				225.4
(Loss)/Income from Discontinued Operations — net of taxes			(0.6	)			0.1				(0.2	)			(0.1	)
Gain on Disposition of Discontinued Operations — net of taxes			—				—				—				0.1
Net Income		$	38.9			$	28.1			$	244.1			$	225.4
Basic Earnings Per Share
Continuing operations		$	0.14			$	0.10			$	0.87			$	0.81
Discontinued operations			—				—				—				—
Basic Earnings Per Share		$	0.14			$	0.10			$	0.87			$	0.81
Diluted Earnings Per Share
Continuing operations		$	0.14			$	0.10			$	0.85			$	0.81
Discontinued operations			—				—				—				—
Diluted Earnings Per Share		$	0.14			$	0.10			$	0.85			$	0.81
Dividends Declared Per Common Share		$	0.23			$	0.23			$	0.69			$	0.69
Basic Average Common Shares Outstanding			280.2				277.6				279.8				277.3
Diluted Average Common Shares			287.1				278.4				286.2				278.0

NiSource Inc.
Consolidated Balance Sheets (GAAP)
(unaudited)

		June 30,				December 31,
(in millions)		2011				2010
ASSETS
Property, Plant and Equipment
Utility Plant		$	19,783.8			$	19,494.9
Accumulated depreciation and amortization			(8,602.9	)			(8,492.6	)
Net utility plant			11,180.9				11,002.3
Other property, at cost, less accumulated depreciation			114.1				94.7
Net Property, Plant and Equipment			11,295.0				11,097.0
Investments and Other Assets
Assets of discontinued operations and assets held for sale			2.3				7.9
Unconsolidated affiliates			197.2				200.9
Total Investments and Other Assets			150.8				139.7
Total Investments and Other Assets			350.3				348.5
Current Assets
Cash and cash equivalents			59.9				9.2
Restricted cash			154.6				202.9
Accounts receivable (less reserve of $42 and $37.4, respectively)			638.3				1,079.3
Income tax receivable			1.2				99.0
Gas inventory			278.0				298.2
Underrecovered gas and fuel costs			24.7				135.7
Materials and supplies, at average cost			87.0				83.8
Electric production fuel, at average cost			44.9				46.0
Price risk management assets			116.0				159.5
Exchange gas receivable			118.2				62.7
Regulatory assets			121.9				151.8
Prepayments and other			100.4				120.8
Total Current Assets			1,745.1				2,448.9
Other Assets
Price risk management assets			190.6				240.3
Regulatory assets			1,622.2				1,650.4
Goodwill			3,677.3				3,677.3
Intangible assets			303.1				308.6
Postretirement and postemployment benefits assets			42.0				35.1
Deferred charges and other			120.7				132.7
Total Other Assets			5,955.9				6,044.4
Total Assets		$	19,346.3			$	19,938.8

NiSource Inc.
Consolidated Balance Sheets (continued) (GAAP)
(unaudited)

		June 30,				December 31,
(in millions, except share amounts)		2011				2010
CAPITALIZATION AND LIABILITIES
Capitalization
Common Stockholders’ Equity
Common stock — $0.01 par value, 400,000,000 shares authorized; 280,472,662 and 278,855,291 shares issued and outstanding, respectively		$	2.8			$	2.8
Additional paid-in capital			4,132.9				4,103.9
Retained earnings			952.6				901.8
Accumulated other comprehensive loss			(54.5	)			(57.9	)
Treasury stock			(30.4	)			(27.4	)
Total Common Stockholders’ Equity			5,003.4				4,923.2
Long-term debt, excluding amounts due within one year			6,340.0				5,936.1
Total Capitalization			11,343.4				10,859.3
Current Liabilities
Current portion of long-term debt			30.0				34.2
Short-term borrowings			870.4				1,382.5
Accounts payable			316.2				581.8
Dividends payable			64.6				0.1
Customer deposits and credits			183.1				318.1
Taxes accrued			179.5				221.1
Interest accrued			114.4				114.4
Overrecovered gas and fuel costs			121.4				11.8
Price risk management liabilities			135.0				173.9
Exchange gas payable			155.4				266.1
Deferred revenue			5.0				6.8
Regulatory liabilities			83.5				92.9
Accrued liability for postretirement and postemployment benefits			23.3				23.3
Temporary LIFO liquidation credit			0.3				—
Legal and environmental reserves			46.0				86.0
Other accruals			230.0				336.4
Total Current Liabilities			2,558.1				3,649.4
Other Liabilities and Deferred Credits
Price risk management liabilities			127.8				181.6
Deferred income taxes			2,369.1				2,209.7
Deferred investment tax credits			31.3				33.7
Deferred credits			75.5				68.6
Deferred revenue			—				0.3
Accrued liability for postretirement and postemployment benefits			919.6				1,039.6
Regulatory liabilities and other removal costs			1,624.8				1,595.8
Asset retirement obligations			138.9				138.8
Other noncurrent liabilities			157.8				162.0
Total Other Liabilities and Deferred Credits			5,444.8				5,430.1
Total Capitalization and Liabilities		$	19,346.3			$	19,938.8