10-Q

UNITED STATES

SECURITIES AND EXCHANGE COMMISSION

Washington, D.C. 20549

FORM 10-Q

þ  QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d)

OF THE SECURITIES EXCHANGE ACT OF 1934

For the quarterly period ended March 31, 2014

or

¨  TRANSITION REPORT PURSUANT TO SECTION 13 OR 15(d)

OF THE SECURITIES EXCHANGE ACT OF 1934

For the transition period from to

Commission file number 001-16189

NiSource Inc.

(Exact name of registrant as specified in its charter)

Delaware	35-2108964
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification No.)
801 East 86th Avenue Merrillville, Indiana	46410
(Address of principal executive offices)	(Zip Code)

(877) 647-5990

(Registrant’s telephone number, including area code)

Indicate by check mark whether the registrant: (1) has filed all reports required to be filed by Section 13 or 15(d) of the Securities Exchange Act of 1934 during the preceding 12 months (or for such shorter period that the registrant was required to file such reports), and (2) has been subject to such filing requirements for the past 90 days.

Yes þ    No ¨

Indicate by check mark whether the registrant has submitted electronically and posted on its corporate Web site, if any, every Interactive Data File required to be submitted and posted pursuant to Rule 405 of Regulation S-T (232.405 of this chapter) during the preceding 12 months (or for such shorter period that the registrant was required to submit and post such files.)

Yesþ    No ¨

Indicate by check mark whether the registrant is a large accelerated filer, an accelerated filer, a non-accelerated filer, or a smaller reporting company.

Large accelerated filer þ                    Accelerated filer ¨

Non-accelerated filer ¨                      Smaller reporting company ¨

Indicate by check mark whether the registrant is a shell company (as defined in Rule 12b-2 of the Exchange Act).

Yes ¨    No þ

Indicate the number of shares outstanding of each of the issuer’s classes of common stock, as of the latest practicable date: Common Stock, $0.01 Par Value: 314,876,852 shares outstanding at April 24, 2014.

NISOURCE INC.

FORM 10-Q QUARTERLY REPORT

FOR THE QUARTER ENDED MARCH 31, 2014

Table of Contents

			Page
	Defined Terms		3
PART I	FINANCIAL INFORMATION
	Item 1.	Financial Statements - unaudited
		Condensed Statements of Consolidated Income (unaudited)	6
		Condensed Statements of Consolidated Comprehensive Income (unaudited)	7
		Condensed Consolidated Balance Sheets (unaudited)	8
		Condensed Statements of Consolidated Cash Flows (unaudited)	10
		Condensed Statement of Consolidated Common Stockholders' Equity (unaudited)	11
		Notes to Condensed Consolidated Financial Statements (unaudited)	12
	Item 2.	Management’s Discussion and Analysis of Financial Condition and Results of Operations	35
	Item 3.	Quantitative and Qualitative Disclosures About Market Risk	53
	Item 4.	Controls and Procedures	53
PART II	OTHER INFORMATION
	Item 1.	Legal Proceedings	54
	Item 1A.	Risk Factors	54
	Item 2.	Unregistered Sales of Equity Securities and Use of Proceeds	54
	Item 3.	Defaults Upon Senior Securities	54
	Item 4.	Mine Safety Disclosures	54
	Item 5.	Other Information	54
	Item 6.	Exhibits	55
	Signature		56

2

DEFINED TERMS The following is a list of frequently used abbreviations or acronyms that are found in this report:
NiSource Subsidiaries and Affiliates
Capital Markets	NiSource Capital Markets, Inc.
CER	Columbia Energy Resources, Inc.
CGORC	Columbia Gas of Ohio Receivables Corporation
Columbia	Columbia Energy Group
Columbia Gulf	Columbia Gulf Transmission, LLC
Columbia of Kentucky	Columbia Gas of Kentucky, Inc.
Columbia of Maryland	Columbia Gas of Maryland, Inc.
Columbia of Massachusetts	Bay State Gas Company
Columbia of Ohio	Columbia Gas of Ohio, Inc.
Columbia of Pennsylvania	Columbia Gas of Pennsylvania, Inc.
Columbia of Virginia	Columbia Gas of Virginia, Inc.
Columbia Transmission	Columbia Gas Transmission, LLC
CPRC	Columbia Gas of Pennsylvania Receivables Corporation
Crossroads Pipeline	Crossroads Pipeline Company
Hardy Storage	Hardy Storage Company, LLC
Kokomo Gas	Kokomo Gas and Fuel Company
Millennium	Millennium Pipeline Company, L.L.C.
NARC	NIPSCO Accounts Receivable Corporation
NDC Douglas Properties	NDC Douglas Properties, Inc.
NEVCO	NiSource Energy Ventures, LLC
NIPSCO	Northern Indiana Public Service Company
NiSource	NiSource Inc.
NiSource Corporate Services	NiSource Corporate Services Company
NiSource Development Company	NiSource Development Company, Inc.
NiSource Finance	NiSource Finance Corporation
Northern Indiana Fuel and Light	Northern Indiana Fuel and Light Company
NiSource Midstream	NiSource Midstream Services, LLC
Pennant	Pennant Midstream, LLC
Abbreviations
AFUDC	Allowance for funds used during construction
AMRP	Accelerated Main Replacement Program
AOC	Administrative Order by Consent
AOCI	Accumulated Other Comprehensive Income (Loss)
ARRs	Auction Revenue Rights
ASC	Accounting Standards Codification
ASU	Accounting Standards Update
BBA	British Banker Association
Bcf	Billion cubic feet
BNS	Bank of Nova Scotia
Board	Board of Directors
BPAE	BP Alternative Energy North America, Inc.

3

DEFINED TERMS (continued)
BTMU	The Bank of Tokyo-Mitsubishi UFJ, LTD.
BTU	British Thermal Unit
CAA	Clean Air Act
CAIR	Clean Air Interstate Rule
CAMR	Clean Air Mercury Rule
Ccf	Hundred cubic feet
CERCLA	Comprehensive Environmental Response, Compensation and
	Liability Act (also known as Superfund)
CO2	Carbon Dioxide
CSAPR	Cross-State Air Pollution Rule
Day 2	Began April 1, 2005 and refers to the operational control of the energy markets by MISO, including the dispatching of wholesale electricity and generation, managing transmission constraints, and managing the day-ahead, real-time and financial transmission rights markets
DPU	Department of Public Utilities
DSIC	Distribution System Improvement Charge
DSM	Demand Side Management
Dth	Dekatherm
ECR	Environmental Cost Recovery
ECRM	Environmental Cost Recovery Mechanism
ECT	Environmental Cost Tracker
EERM	Environmental Expense Recovery Mechanism
EPA	United States Environmental Protection Agency
EPS	Earnings per share
FAC	Fuel adjustment clause
FASB	Financial Accounting Standards Board
FERC	Federal Energy Regulatory Commission
FGD	Flue Gas Desulfurization
FTRs	Financial Transmission Rights
GAAP	Generally Accepted Accounting Principles
GCIM	Gas Cost Incentive Mechanism
GCR	Gas cost recovery
GHG	Greenhouse gases
gwh	Gigawatt hours
Hilcorp	Hilcorp Energy Company
hp	Horsepower
IDEM	Indiana Department of Environmental Management
INDIEC	Indiana Industrial Energy Consumers, Inc.
IRP	Infrastructure Replacement Program
IRS	Internal Revenue Service
IURC	Indiana Utility Regulatory Commission
kV	Kilovolt
LDCs	Local distribution companies
LIBOR	London InterBank Offered Rate
LIFO	Last-in, first-out
LNG	Liquefied Natural Gas

4

DEFINED TERMS (continued)
MATS	Mercury and Air Toxics Standards
Mcf	Thousand cubic feet
MMcf	Million cubic feet
MGP	Manufactured Gas Plant
MISO	Midcontinent Independent System Operator
Mitchell	Dean H. Mitchell Coal Fired Generating Station
Mizuho	Mizuho Corporate Bank Ltd.
MMDth	Million dekatherms
mw	Megawatts
NAAQS	National Ambient Air Quality Standards
NOV	Notice of Violation
NO2	Nitrogen dioxide
NOx	Nitrogen oxide
NYMEX	New York Mercantile Exchange
OCI	Other Comprehensive Income (Loss)
OPEB	Other Postretirement Benefits
OUCC	Indiana Office of Utility Consumer Counselor
PADEP	Pennsylvania Department of Environmental Protection
Piedmont	Piedmont Natural Gas Company, Inc.
PM	Particulate matter
PNC	PNC Bank, N.A.
PSC	Public Service Commission
PUC	Public Utility Commission
PUCO	Public Utilities Commission of Ohio
RA	Resource Adequacy
RBS	Royal Bank of Scotland, PLC
RCRA	Resource Conservation and Recovery Act
RDAF	Revenue decoupling adjustment factor
RTO	Regional Transmission Organization
SEC	Securities and Exchange Commission
SIP	State Implementation Plan
SO2	Sulfur dioxide
TDSIC	Transmission, Distribution and Storage System Improvement Charge
TIRF	Targeted Infrastructure Reinvestment Factor
VaR	Value-at-risk and instrument sensitivity to market factors
VIE	Variable Interest Entities
VSCC	Virginia State Corporation Commission
WACOG	Weighted Average Cost of Gas

5

PART I

ITEM 1. FINANCIAL STATEMENTS

NiSource Inc.

Condensed Statements of Consolidated Income (unaudited)

	Three Months Ended March 31,
(in millions, except per share amounts)	2014			2013
Net Revenues
Gas Distribution	$	1,215.0		$	892.2
Gas Transportation and Storage	578.5			468.5
Electric	450.0			377.3
Other	77.0			44.2
Gross Revenues	2,320.5			1,782.2
Cost of Sales (excluding depreciation and amortization)	1,061.3			676.0
Total Net Revenues	1,259.2			1,106.2
Operating Expenses
Operation and maintenance	501.2			454.3
Depreciation and amortization	148.7			143.6
Gain on sale of assets, net	(15.7		)	(0.2		)
Other taxes	101.1			86.7
Total Operating Expenses	735.3			684.4
Equity Earnings in Unconsolidated Affiliates	9.8			7.1
Operating Income	533.7			428.9
Other Income (Deductions)
Interest expense, net	(109.1		)	(98.6		)
Other, net	4.5			4.1
Total Other Deductions	(104.6		)	(94.5		)
Income from Continuing Operations before Income Taxes	429.1			334.4
Income Taxes	162.7			118.4
Income from Continuing Operations	266.4			216.0
(Loss) Income from Discontinued Operations - net of taxes	(0.2		)	8.1
Gain on Disposition of Discontinued Operations - net of taxes	—			36.4
Net Income	$	266.2		$	260.5
Basic Earnings Per Share
Continuing operations	$	0.85		$	0.69
Discontinued operations	—			0.15
Basic Earnings Per Share	$	0.85		$	0.84
Diluted Earnings Per Share
Continuing operations	$	0.85		$	0.69
Discontinued operations	—			0.14
Diluted Earnings Per Share	$	0.85		$	0.83
Dividends Declared Per Common Share	$	0.50		$	0.48
Basic Average Common Shares Outstanding	314.2			311.1
Diluted Average Common Shares	315.1			312.1

The accompanying Notes to Condensed Consolidated Financial Statements (unaudited) are an integral part of these statements.

6

Table of Contents

ITEM 1. FINANCIAL STATEMENTS (continued)

NiSource Inc.

Condensed Statements of Consolidated Comprehensive Income (unaudited)

	Three Months Ended March 31,
(in millions, net of taxes)	2014		2013
Net Income	$	266.2	$	260.5
Other comprehensive income (loss)
Net unrealized gain (loss) on available-for-sale securities(1)	0.3		(0.4		)
Net unrealized gain on cash flow hedges(2)	0.6		0.9
Unrecognized pension benefit and OPEB benefit(3)	0.2		2.7
Total other comprehensive income	1.1		3.2
Total Comprehensive Income	$	267.3	$	263.7

⁽¹⁾ Net unrealized gain (loss) on available-for-sale securities, net of $0.2 million tax expense and $0.1 million tax benefit in the first quarter of 2014 and 2013, respectively.

⁽²⁾ Net unrealized gains on derivatives qualifying as cash flow hedges, net of $0.4 million and $0.6 million tax expense in the first quarter of 2014 and 2013, respectively.

⁽³⁾ Unrecognized pension benefit and OPEB benefit, net of zero and $1.7 million tax expense in the first quarter of 2014 and 2013, respectively.

The accompanying Notes to Condensed Consolidated Financial Statements (unaudited) are an integral part of these statements.

7

Table of Contents

ITEM 1. FINANCIAL STATEMENTS (continued)

NiSource Inc. Condensed Consolidated Balance Sheets (unaudited)
(in millions)	March 31, 2014			December 31, 2013
ASSETS
Property, Plant and Equipment
Utility plant	$	23,695.7		$	23,303.7
Accumulated depreciation and amortization	(9,358.6		)	(9,256.5		)
Net utility plant	14,337.1			14,047.2
Other property, at cost, less accumulated depreciation	320.6			317.9
Net Property, Plant and Equipment	14,657.7			14,365.1
Investments and Other Assets
Unconsolidated affiliates	407.1			373.7
Other investments	203.1			204.0
Total Investments and Other Assets	610.2			577.7
Current Assets
Cash and cash equivalents	38.0			26.8
Restricted cash	10.9			8.0
Accounts receivable (less reserve of $34.6 and $23.5, respectively)	1,271.2			1,005.8
Income tax receivable	4.1			5.1
Gas inventory	97.9			354.6
Underrecovered gas and fuel costs	114.3			46.4
Materials and supplies, at average cost	104.8			101.2
Electric production fuel, at average cost	22.9			44.6
Price risk management assets	14.4			22.7
Exchange gas receivable	161.4			70.6
Regulatory assets	159.1			142.8
Prepayments and other	321.1			330.6
Total Current Assets	2,320.1			2,159.2
Other Assets
Regulatory assets	1,494.9			1,522.2
Goodwill	3,666.2			3,666.2
Intangible assets	272.9			275.7
Deferred charges and other	85.3			87.8
Total Other Assets	5,519.3			5,551.9
Total Assets	$	23,107.3		$	22,653.9

The accompanying Notes to Condensed Consolidated Financial Statements (unaudited) are an integral part of these statements.

8

Table of Contents

ITEM 1. FINANCIAL STATEMENTS (continued)

NiSource Inc. Condensed Consolidated Balance Sheets (unaudited) (continued)
(in millions, except share amounts)	March 31, 2014			December 31, 2013
CAPITALIZATION AND LIABILITIES
Capitalization
Common Stockholders’ Equity
Common stock - $0.01 par value, 400,000,000 shares authorized; 314,800,122 and 313,675,911 shares outstanding, respectively	$	3.2		$	3.2
Additional paid-in capital	4,715.6			4,690.1
Retained earnings	1,394.4			1,285.5
Accumulated other comprehensive loss	(42.5		)	(43.6		)
Treasury stock	(58.6		)	(48.6		)
Total Common Stockholders’ Equity	6,012.1			5,886.6
Long-term debt, excluding amounts due within one year	7,638.5			7,593.2
Total Capitalization	13,650.6			13,479.8
Current Liabilities
Current portion of long-term debt	530.5			542.1
Short-term borrowings	812.5			698.7
Accounts payable	714.4			619.0
Dividends payable	78.7			—
Customer deposits and credits	239.4			262.6
Taxes accrued	278.6			254.8
Interest accrued	75.3			136.4
Overrecovered gas and fuel costs	25.8			32.2
Exchange gas payable	143.1			186.4
Deferred revenue	7.9			18.5
Regulatory liabilities	79.1			60.2
Accrued liability for postretirement and postemployment benefits	6.2			6.2
Legal and environmental	25.5			32.3
Other accruals	323.8			329.0
Total Current Liabilities	3,340.8			3,178.4
Other Liabilities and Deferred Credits
Deferred income taxes	3,392.3			3,277.8
Deferred investment tax credits	20.0			20.9
Deferred credits	100.2			91.9
Noncurrent deferred revenue	21.8			17.1
Accrued liability for postretirement and postemployment benefits	508.1			527.5
Regulatory liabilities	1,677.6			1,669.8
Asset retirement obligations	176.5			174.4
Other noncurrent liabilities	219.4			216.3
Total Other Liabilities and Deferred Credits	6,115.9			5,995.7
Commitments and Contingencies (Refer to Note 17)	—			—
Total Capitalization and Liabilities	$	23,107.3		$	22,653.9

The accompanying Notes to Condensed Consolidated Financial Statements (unaudited) are an integral part of these statements.

9

Table of Contents

ITEM 1. FINANCIAL STATEMENTS (continued)

NiSource Inc. Condensed Statements of Consolidated Cash Flows (unaudited)
Three Months Ended March 31, (in millions)	2014			2013
Operating Activities
Net Income	$	266.2		$	260.5
Adjustments to Reconcile Net Income to Net Cash from Continuing Operations:
Depreciation and amortization	148.7			143.6
Net changes in price risk management assets and liabilities	0.8			0.5
Deferred income taxes and investment tax credits	148.9			117.1
Deferred revenue	1.8			(0.4		)
Stock compensation expense and 401(k) profit sharing contribution	13.9			10.6
Gain on sale of assets	(15.7		)	(0.2		)
Income from unconsolidated affiliates	(9.6		)	(7.3		)
Gain on disposition of discontinued operations - net of taxes	—			(36.4		)
Loss (Income) from discontinued operations - net of taxes	0.2			(8.1		)
Amortization of debt related costs	2.4			2.3
AFUDC equity	(4.0		)	(3.5		)
Distributions of earnings received from equity investees	7.6			7.0
Changes in Assets and Liabilities:
Accounts receivable	(265.1		)	(161.4		)
Income tax receivable	0.9			50.4
Inventories	274.0			254.7
Accounts payable	126.5			25.4
Customer deposits and credits	(23.1		)	(102.0		)
Taxes accrued	19.3			28.1
Interest accrued	(61.1		)	(65.5		)
(Under)Overrecovered gas and fuel costs	(74.2		)	69.3
Exchange gas receivable/payable	(134.2		)	(89.8		)
Other accruals	(30.1		)	(26.6		)
Prepayments and other current assets	4.5			(5.8		)
Regulatory assets/liabilities	2.9			5.8
Postretirement and postemployment benefits	(19.3		)	(36.8		)
Deferred credits	8.4			7.7
Deferred charges and other noncurrent assets	(0.2		)	(0.4		)
Other noncurrent liabilities	4.0			(2.0		)
Net Operating Activities from Continuing Operations	394.4			436.8
Net Operating Activities (used for) from Discontinued Operations	(0.4		)	12.3
Net Cash Flows from Operating Activities	394.0			449.1
Investing Activities
Capital expenditures	(386.3		)	(369.3		)
Proceeds from disposition of assets	5.3			0.5
Restricted cash (deposits) withdrawals	(2.9		)	23.6
Contributions to equity investees	(31.0		)	(17.1		)
Other investing activities	7.0			(5.3		)
Net Investing Activities used for Continuing Operations	(407.9		)	(367.6		)
Net Investing Activities from Discontinued Operations	—			121.5
Net Cash Flows used for Investing Activities	(407.9		)	(246.1		)
Financing Activities
Repayments of long-term debt and capital lease obligations	(9.1		)	(427.1		)
Change in short-term borrowings, net	113.8			354.3
Issuance of common stock	8.9			17.2
Acquisition of treasury stock	(10.0		)	(7.6		)
Dividends paid - common stock	(78.5		)	(74.7		)
Net Cash Flows from (used for) Financing Activities	25.1			(137.9		)
Change in cash and cash equivalents from (used for) continuing operations	11.6			(68.7		)
Cash contributions (to) from discontinued operations	(0.4		)	133.8
Cash and cash equivalents at beginning of period	26.8			36.3
Cash and Cash Equivalents at End of Period	$	38.0		$	101.4

The accompanying Notes to Condensed Consolidated Financial Statements (unaudited) are an integral part of these statements.

10

Table of Contents

ITEM 1. FINANCIAL STATEMENTS (continued)

NiSource Inc.

Condensed Statement of Consolidated Common Stockholders' Equity (unaudited)

(in millions)	Common Stock		Treasury Stock			Additional Paid-In Capital		Retained Earnings			Accumulated Other Comprehensive Income/(Loss)			Total
Balance as of January 1, 2014	$	3.2	$	(48.6	)	$	4,690.1	$	1,285.5		$	(43.6	)	$	5,886.6
Comprehensive Income:
Net Income	—		—			—		266.2			—			266.2
Other comprehensive income, net of tax	—		—			—		—			1.1			1.1
Common stock dividends	—		—			—		(157.3		)	—			(157.3		)
Treasury stock acquired	—		(10.0		)	—		—			—			(10.0		)
Issued:
Employee stock purchase plan	—		—			0.8		—			—			0.8
Long-term incentive plan	—		—			8.4		—			—			8.4
401(k) and profit sharing issuance	—		—			14.3		—			—			14.3
Dividend reinvestment plan	—		—			2.0		—			—			2.0
Balance as of March 31, 2014	$	3.2	$	(58.6	)	$	4,715.6	$	1,394.4		$	(42.5	)	$	6,012.1

The accompanying Notes to Condensed Consolidated Financial Statements (unaudited) are an integral part of these statements.

11

Table of Contents

ITEM 1. FINANCIAL STATEMENTS (continued)

NiSource Inc.

Notes to Condensed Consolidated Financial Statements (unaudited)

1.    Basis of Accounting Presentation

The accompanying Condensed Consolidated Financial Statements (unaudited) for NiSource (the “Company”) reflect all normal recurring adjustments that are necessary, in the opinion of management, to present fairly the results of operations in accordance with GAAP in the United States of America.

The accompanying financial statements should be read in conjunction with the consolidated financial statements and notes thereto included in NiSource’s Annual Report on Form 10-K for the fiscal year ended December 31, 2013. Income for interim periods may not be indicative of results for the calendar year due to weather variations and other factors.

The Condensed Consolidated Financial Statements (unaudited) have been prepared pursuant to the rules and regulations of the SEC. Certain information and note disclosures normally included in annual financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to those rules and regulations, although NiSource believes that the disclosures made are adequate to make the information not misleading.

2.    Recent Accounting Pronouncements

In April 2014, the FASB issued ASU 2014-08, Presentation of Financial Statements (Topic 205) and Property, Plant, and Equipment (Topic 360): Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity. ASU 2014-08 changes the criteria for reporting a discontinued operation. Under the new pronouncement, a disposal of a part of an organization that has a major effect on its operations and financial results is a discontinued operation. NiSource is required to adopt ASU 2014-08 prospectively for all disposals or components of its business classified as held for sale during fiscal periods beginning after December 15, 2014. NiSource is currently evaluating what impact, if any, adoption of ASU 2014-08 will have on its Condensed Consolidated Financial Statements (unaudited) and Notes to Condensed Consolidated Financial Statements (unaudited).

3.    Earnings Per Share

Basic EPS is computed by dividing income available to common stockholders by the weighted-average number of shares of common stock outstanding for the period. The weighted average shares outstanding for diluted EPS includes the incremental effects of the various long-term incentive compensation plans. The numerator in calculating both basic and diluted EPS for each period is reported net income. The computation of diluted average common shares follows:

	Three Months Ended
	March 31,
(in thousands)	2014	2013
Denominator
Basic average common shares outstanding	314,222	311,120
Dilutive potential common shares:
Stock options	59	156
Shares contingently issuable under employee stock plans	399	276
Shares restricted under stock plans	442	523
Diluted Average Common Shares	315,122	312,075

4.    Gas in Storage

Both the LIFO inventory methodology and the weighted average cost methodology are used to value natural gas in storage. Gas Distribution Operations price natural gas storage injections at the average of the costs of natural gas supply purchased during the year. For interim periods, the difference between current projected replacement cost and the LIFO cost for quantities of gas temporarily withdrawn from storage is recorded as a temporary LIFO liquidation credit or debit within the Condensed Consolidated Balance Sheets (unaudited). Due to seasonality requirements, NiSource expects interim variances in LIFO layers to be replenished by year-end. NiSource had a temporary LIFO liquidation debit of $10.3 million and zero as of March 31, 2014 and December 31, 2013, respectively, for certain gas distribution companies recorded within “Prepayments and other,” on the Condensed Consolidated Balance Sheets (unaudited).

12

Table of Contents

ITEM 1. FINANCIAL STATEMENTS (continued)

NiSource Inc.

Notes to Condensed Consolidated Financial Statements (unaudited) (continued)

5.    Discontinued Operations and Assets and Liabilities Held for Sale

On September 1, 2013, NiSource sold the commercial and industrial natural gas portfolio of its unregulated natural gas marketing business. The sale included the physical contracts and associated financial hedges that comprise the portfolio, as well as the gas inventory and customer deposits of the business. The sale resulted in an after tax loss of $1.5 million which was recorded during the third quarter of 2013.

During 2012, NiSource began marketing to sell the service plan and leasing business lines of its Retail Services business. The sale of the business lines closed in January 2013 resulting in gain from the disposition of discontinued operations of $36.4 million, net of taxes, which was recorded during the first quarter of 2013.

There were no assets and liabilities of discontinued operations and held for sale on the Condensed Consolidated Balance Sheets (unaudited) at March 31, 2014 and December 31, 2013.

Results from discontinued operations are provided in the following table. These results are primarily from a settlement at NiSource's former exploration and production subsidiary, CER, NiSource's Retail Services business, and NiSource's unregulated natural gas marketing business.

	Three Months Ended March 31,
(in millions)	2014			2013
Revenues from Discontinued Operations	$	—		$	16.2
(Loss) Income from discontinued operations	(0.3		)	13.2
Income tax (benefit) expense	(0.1		)	5.1
(Loss) Income from Discontinued Operations - net of taxes	$	(0.2	)	$	8.1
Gain on Disposition of Discontinued Operations - net of taxes	$	—		$	36.4

6.    Asset Retirement Obligations

Certain costs of removal that have been, and continue to be, included in depreciation rates and collected in the service rates of the rate-regulated subsidiaries are classified as “Regulatory liabilities” on the Condensed Consolidated Balance Sheets (unaudited).

Changes in NiSource’s liability for asset retirement obligations for the three months ended March 31, 2014 and 2013 are presented in the table below:

(in millions)	2014			2013
Balance as of January 1,	$	174.4		$	160.4
Accretion expense	0.4			0.3
Accretion recorded as a regulatory asset/liability	2.1			2.3
Additions	0.1			2.9
Settlements	(0.5		)	(0.3		)
Change in estimated cash flows	—			(0.3		)
Balance as of March 31,	$	176.5		$	165.3

13

Table of Contents

ITEM 1. FINANCIAL STATEMENTS (continued)

NiSource Inc.

Notes to Condensed Consolidated Financial Statements (unaudited) (continued)

7.    Regulatory Matters

Gas Distribution Operations Regulatory Matters

Significant Rate Developments. On April 30, 2013, Indiana Governor Pence signed Senate Enrolled Act 560 into law. Among other provisions, this legislation provides for cost recovery outside of a base rate proceeding for new or replacement electric and gas transmission, distribution, and storage projects that a public utility undertakes for the purposes of safety, reliability, system modernization, or economic development. Provisions of the TDSIC statute require that, among other things, requests for recovery include a seven year plan of eligible investments.  Once the plan is approved by the IURC, 80 percent of eligible costs can be recovered using a periodic rate adjustment mechanism.  The cost recovery mechanism is referred to as a TDSIC mechanism. Recoverable costs include a return on, and of, the investment, including AFUDC, post in service carrying charges, operation and maintenance expenses, depreciation, and property taxes.  The remaining 20 percent of recoverable costs are to be deferred for future recovery in the public utility’s next general rate case.  The periodic rate adjustment mechanism is capped at an annual increase of no more than two percent of total retail revenues. On October 3, 2013, NIPSCO filed its gas TDSIC seven-year plan of eligible investments for a total of approximately $710 million with the IURC. An order is expected by the second quarter of 2014.

On November 25, 2013, Columbia of Ohio filed a Notice of Intent to file an application to adjust rates associated with its IRP and DSM Riders. Columbia of Ohio filed its Application on February 28, 2014, requesting authority to increase revenues by approximately $25.5 million. The parties have settled all issues, and on April 7, 2014 filed a stipulation providing for a revenue increase of approximately $25.5 million. On April 23, 2014, Columbia of Ohioreceived approval of its annual infrastructure replacement and demand-side management rider request from the PUCO. New rates are effective April 30, 2014.

On April 16, 2013, Columbia of Massachusetts submitted a filing with the Massachusetts DPU requesting an annual revenue requirement increase of $30.1 million. Pursuant to the procedural schedule for this case, on September 3, 2013, Columbia of Massachusetts filed its updated revenue requirement of $29.5 million and on October 16, 2013, filed an updated cost of service for $30.0 million. A final revenue requirement update of $29.9 million was filed on December 16, 2013. On February 28, 2014 the Massachusetts DPU issued an order granting an annual revenue requirement increase of $19.3 million effective March 1, 2014, and the compliance filing associated with the order has been approved. Columbia of Massachusetts currently has two Motions for Reconsideration and Clarification pending before the Massachusetts DPU with regard to specific findings in the order.

On September 16, 2013, Columbia of Massachusetts filed its Peak Period Gas Adjustment Factor (“GAF”) for the period November 1, 2013 through April 30 2014, and its Peak Period 2012-2013 GAF Reconciliation. On January 17, 2014, Columbia of Massachusetts filed a revision to the GAF effective February 1, 2014, and on February 18, 2014, Columbia of Massachusetts filed its second revision to the GAF effective March 1, 2014, to eliminate Columbia of Massachusetts’s projected Peak Period under-collection of $50 million. On February 28, 2014, the Massachusetts DPU approved the revision subject to further review and reconciliation, but deferred recovery of $25 million of the projected under-collection to November 2014 - April 2015, and thus, this deferred amount will be incorporated into the proposed GAF to be submitted in Columbia of Massachusetts’s 2014-2015 Peak Period GAF filing.

On March 21, 2014, Columbia of Pennsylvania filed a base rate case with the Pennsylvania PUC, seeking a revenue increase of approximately $54.1 million annually. The case is driven by Columbia of Pennsylvania’s capital investment program which exceeds $180 million in both 2014 and 2015 as well as new pipeline safety-related operation and maintenance expenditures. Columbia of Pennsylvania seeks Pennsylvania PUC approval to implement additional rates to recover costs that are projected to be incurred after the implementation of those new rates, as authorized by the Pennsylvania General Assembly with the passage of Act 11 of 2012. Columbia of Pennsylvania's filing seeks to implement rates in December 2014 under which Columbia of Pennsylvania would immediately begin to recover costs that are projected for the twelve-month period ending December 31, 2015. The case is currently in discovery, and a final order from the Pennsylvania PUC is expected in the fourth quarter of 2014.

Cost Recovery and Trackers. A significant portion of the distribution companies' revenue is related to the recovery of gas costs, the review and recovery of which occurs via standard regulatory proceedings. All states require periodic review of actual gas procurement activity to determine prudence and to permit the recovery of prudently incurred costs related to the supply of gas for customers. NiSource distribution companies have historically been found prudent in the procurement of gas supplies to serve customers.

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ITEM 1. FINANCIAL STATEMENTS (continued)

NiSource Inc.

Notes to Condensed Consolidated Financial Statements (unaudited) (continued)

Certain operating costs of the NiSource distribution companies are significant, recurring in nature, and generally outside the control of the distribution companies. Some states allow the recovery of such costs via cost tracking mechanisms. Such tracking mechanisms allow for abbreviated regulatory proceedings in order for the distribution companies to implement charges and recover appropriate costs. Tracking mechanisms allow for more timely recovery of such costs as compared with more traditional cost recovery mechanisms. Examples of such mechanisms include GCR adjustment mechanisms, tax riders, gas energy efficiency programs, and bad debt recovery mechanisms.

Comparability of Gas Distribution Operations line item operating results is impacted by regulatory trackers that allow for the recovery in rates of certain costs such as bad debt expenses. Increases in the expenses that are subject to trackers result in a corresponding increase in net revenues and therefore have essentially no impact on total operating income results.

Certain of the NiSource distribution companies have completed rate proceedings involving infrastructure replacement or are embarking upon regulatory initiatives to replace significant portions of their operating systems that are nearing the end of their useful lives. Each LDC's approach to cost recovery may be unique, given the different laws, regulations and precedent that exist in each jurisdiction.

Columbia Pipeline Group Operations Regulatory Matters

Significant Rate Developments. On January 30, 2014, Columbia Transmission received FERC approval of its December 2013 filing to recover costs associated with the first year of its comprehensive system modernization program. During 2013, Columbia Transmission completed more than 30 individual projects representing a total investment of about $300 million. The program includes replacement of aging pipeline and compressor facilities, enhancements to system inspection capabilities, and improvements in real-time analytics and control systems. Recovery of the 2013 investments began on February 1, 2014.

The second year of the program includes planned modernization investments of approximately $300 million. Columbia Transmission and its customers have agreed to the initial five years of the comprehensive modernization program, with an opportunity to mutually extend the agreement.

Cost Recovery Trackers.A significant portion of the regulated transmission and storage companies' revenue is related to the recovery of their operating costs, the review and recovery of which occurs via standard regulatory proceedings with the FERC under section 4 of the Natural Gas Act. However, certain operating costs of the NiSource regulated transmission and storage companies are significant and recurring in nature, such as fuel for compression and lost and unaccounted for gas. The FERC allows for the recovery of such costs via cost tracking mechanisms. These tracking mechanisms allow the transmission and storage companies' rates to fluctuate in response to changes in certain operating costs or conditions as they occur to facilitate the timely recovery of its costs incurred. The tracking mechanisms involve a rate adjustment that is filed at a predetermined frequency, typically annually, with the FERC and is subject to regulatory review before new rates go into effect. Other such costs under regulatory tracking mechanisms include third-party pipeline transportation, electric compression, certain environmental, and certain operational purchases and sales of natural gas.

Electric Operations Regulatory Matters

Significant Rate Developments. On July 19, 2013, NIPSCO filed its electric TDSIC, further discussed above, with the IURC. The filing included the seven-year plan of eligible investments for a total of approximately $1.1 billion with the majority of the spend occurring in years 2016 through 2020. On February 17, 2014, the IURC issued an order approving NIPSCO’s seven-year plan of eligible investments. The Order also granted NIPSCO ratemaking relief associated with the eligible investments through a rate adjustment mechanism. NIPSCO anticipates filing its first semi-annual tracker petition in the third quarter of 2014. On March 10, 2014 the OUCC filed a Petition for Reconsideration with the IURC which is still pending. In addition, two parties have filed Notices of Appeal with the Indiana Court of Appeals to appeal the IURC's ruling.

On November 12, 2013, several industrial customers, including INDIEC, filed a complaint at the FERC regarding the 12.38% base ROE used to set the MISO Transmission Owners' transmission rates and requesting a reduction in the base ROE to 9.15%. The complaint further requests that FERC limit the capital structure of MISO Transmission Owners to no more than 50% common equity for ratemaking purposes and that FERC eliminate incentive adders for membership in a RTO. NIPSCO joined in an answer defending the 12.38% base ROE and motion to dismiss the complaint filed on behalf of a group of MISO Transmission Owners on January 6, 2014. NIPSCO is unable to estimate the impact of this complaint or the timing of any potential impact at this time.

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ITEM 1. FINANCIAL STATEMENTS (continued)

NiSource Inc.

Notes to Condensed Consolidated Financial Statements (unaudited) (continued)

Cost Recovery and Trackers. A significant portion of NIPSCO's revenue is related to the recovery of fuel costs to generate power and purchased power. These costs are recovered through a FAC, a standard, quarterly, “summary” regulatory proceeding in Indiana.

Certain operating costs of the Electric Operations are significant, recurring in nature, and generally outside the control of NIPSCO. The IURC allows for recovery of such costs via cost tracking mechanisms. Such tracking mechanisms allow for abbreviated regulatory proceedings in order for NIPSCO to implement charges and recover appropriate costs. Tracking mechanisms allow for more timely recovery of such costs as compared with more traditional cost recovery mechanisms. Examples of such mechanisms include electric energy efficiency programs, MISO non-fuel costs and revenues, resource capacity charges, and environmental related costs.

NIPSCO has approval from the IURC to recover certain environmental related costs through an ECT. Under the ECT, NIPSCO is permitted to recover (1) AFUDC and a return on the capital investment expended by NIPSCO to implement environmental compliance plan projects through an ECRM and (2) related operation and maintenance and depreciation expenses once the environmental facilities become operational through an EERM. On January 31, 2014, NIPSCO filed ECR-23 which included $583.5 million of net capital expenditures for the period ending December 31, 2013. An order is expected by the second quarter of 2014.

8.    Risk Management Activities

NiSource is exposed to certain risks relating to its ongoing business operations. The primary risks managed by using derivative instruments are commodity price risk and interest rate risk. Derivative natural gas contracts are entered into to manage the price risk associated with natural gas price volatility and to secure forward natural gas prices. Interest rate swaps are entered into to manage interest rate risk or fair value risk associated with NiSource’s borrowings. NiSource designates some of its commodity forward contracts as cash flow hedges of forecasted purchases of commodities and designates its interest rate swaps as fair value hedges of fixed-rate borrowings.

Accounting Policy for Derivative Instruments.    Unrealized and realized gains and losses are recognized each period as components of AOCI, regulatory assets and liabilities or earnings depending on the designation of the derivative instrument and regulatory accounting treatment. For subsidiaries that utilize derivatives for cash flow hedges, the effective portions of the gains and losses are recorded to AOCI and are recognized in earnings concurrent with the disposition of the hedged risks. If a forecasted transaction corresponding to a cash flow hedge is no longer probable to occur, the accumulated gains or losses on the derivative are recognized currently in earnings. For fair value hedges, the gains and losses are recorded in earnings each period together with the change in the fair value of the hedged item. As a result of the rate-making process, the rate-regulated subsidiaries generally record gains and losses as regulatory liabilities or assets and recognize such gains or losses in earnings when both the contracts settle and the physical commodity flows. These gains and losses recognized in earnings are then subsequently recovered or passed back to customers in revenues through rates. When gains and losses are recognized in earnings, they are recognized in revenues or cost of sales for derivatives that correspond to commodity risk activities and are recognized in interest expense for derivatives that correspond to interest-rate risk activities.

For its commodity price risk programs, NiSource has elected not to net the fair value amounts of its derivative instruments or the fair value amounts recognized for its right to receive or obligation to pay cash collateral arising from those derivative instruments recognized at fair value, which are executed with the same counterparty under a master netting arrangement. NiSource discloses amounts recognized for the right to reclaim cash collateral within “Restricted cash” and amounts recognized for the obligation to return cash collateral within “Other accruals” on the Condensed Consolidated Balance Sheets (unaudited).

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ITEM 1. FINANCIAL STATEMENTS (continued)

NiSource Inc.

Notes to Condensed Consolidated Financial Statements (unaudited) (continued)

Commodity Price Risk Programs.    

Commodity price risk program derivatives consist of NYMEX gas options, NYMEX gas futures and FTRs. Contracted gross volumes are as follows:

	March 31, 2014	December 31, 2013
Commodity Price Risk Program:
Gas price volatility program derivatives (MMDth)	13.9	17.0
Price Protection Service program derivatives (MMDth)	0.3	0.7
DependaBill program derivatives (MMDth)	0.1	0.2
Electric energy program FTR derivatives (mw)	—	1,248.0

Interest Rate Risk Activities. NiSource recognizes that the prudent and selective use of derivatives may help it to lower its cost of debt capital and manage its interest rate exposure. NiSource Finance has entered into various “receive fixed” and “pay floating” interest rate swap agreements which modify the interest rate characteristics of a portion of its outstanding long-term debt from fixed to variable rate. These interest rate swaps also serve to hedge the fair market value of NiSource Finance’s outstanding debt portfolio. As of March 31, 2014, NiSource had $7.7 billion of outstanding fixed rate debt, of which $500 million is subject to fluctuations in interest rates as a result of the fixed-to-variable interest rate swap transactions. These interest rate swaps are designated as fair value hedges. NiSource had no net gain or loss recognized in earnings due to hedging ineffectiveness for the three months ended March 31, 2014 and 2013.

On July 22, 2003, NiSource Finance entered into fixed-to-variable interest rate swap agreements in a notional amount of $500 million with four counterparties which will expire on July 15, 2014. NiSource Finance receives payments based upon a fixed 5.40% interest rate and pays a floating interest amount based on U.S. 6-month BBA LIBOR plus an average of 0.78% per annum. There was no exchange of premium at the initial date of the swaps.

Contemporaneously with the issuance on September 16, 2005 of $1 billion of its 5.25% and 5.45% notes, maturing September 15, 2017 and 2020, respectively, NiSource Finance settled $900 million of forward starting interest rate swap agreements with six counterparties. NiSource paid an aggregate settlement payment of $35.5 million which is being amortized from AOCI to interest expense over the term of the underlying debt, resulting in an effective interest rate of 5.67% and 5.88%, respectively. As of March 31, 2014, AOCI includes $7.8 million related to forward starting interest rate swap settlement, net of tax. These derivative contracts are accounted for as a cash flow hedge.

As of March 31, 2014, NiSource holds a 47.5% interest in Millennium. As NiSource reports Millennium as an equity method investment, NiSource is required to recognize a proportional share of Millennium’s OCI. NiSource’s proportionate share of the remaining unrecognized loss associated with settled interest rate swaps was $17.4 million and $17.7 million, net of tax, as of March 31, 2014 and December 31, 2013, respectively. Millennium is amortizing the losses related to these terminated interest rate swaps into earnings using the effective interest method through interest expense as interest payments are made. NiSource records its proportionate share of the amortization as Equity Earnings in Unconsolidated Affiliates in the Condensed Statements of Consolidated Income (unaudited).

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ITEM 1. FINANCIAL STATEMENTS (continued)

NiSource Inc.

Notes to Condensed Consolidated Financial Statements (unaudited) (continued)

NiSource’s location and fair value of derivative instruments on the Condensed Consolidated Balance Sheets (unaudited) were:

Asset Derivatives(in millions)	March 31, 2014		December 31, 2013
Balance Sheet Location	Fair Value		Fair Value
Derivatives designated as hedging instruments
Commodity price risk programs
Price risk management assets (current)	$	0.1	$	—
Interest rate risk activities
Price risk management assets (current)	10.7		21.2
Total derivatives designated as hedging instruments	$	10.8	$	21.2
Derivatives not designated as hedging instruments
Commodity price risk programs
Price risk management assets (current)	$	3.6	$	1.5
Price risk management assets (noncurrent)	—		0.5
Total derivatives not designated as hedging instruments	$	3.6	$	2.0
Total Asset Derivatives	$	14.4	$	23.2

There were no significant liability derivatives as of March 31, 2014 and December 31, 2013.

As noted in NiSource's accounting policy for derivative instruments, above, for its commodity price risk programs, NiSource has elected not to net fair value amounts for its derivative instruments or the fair value amounts recognized for its right to receive cash collateral or obligation to pay cash collateral arising from those derivative instruments recognized at fair value, which are executed with the same counterparty under a master netting arrangement.

The tables below represent the amounts subject to an enforceable master netting arrangement not otherwise disclosed:

Offsetting of Derivative Assets (in millions)
As of March 31, 2014
	Gross Amounts of Recognized Assets		Gross Amounts Offset in the Statement of Financial Position		Net Amounts of Assets Presented in the Statement of Financial Position		Gross Amounts Not Offset in the Statement of Financial Position			Net Amount
Counterparty B	$	3.7	$	—	$	3.7	$	(0.4	)	$	3.3
Other (1)	10.7		—		10.7		—			10.7
Total	$	14.4	$	—	$	14.4	$	(0.4	)	$	14.0

Offsetting of Derivative Liabilities (in millions)
As of March 31, 2014
	Gross Amounts of Recognized Liabilities			Gross Amounts Offset in the Statement of Financial Position		Net Amounts of Liabilities Presented in the Statement of Financial Position			Gross Amounts Not Offset in the Statement of Financial Position		Net Amount
Counterparty B	$	(0.4	)	$	—	$	(0.4	)	$	0.4	$	—
Total	$	(0.4	)	$	—	$	(0.4	)	$	0.4	$	—

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ITEM 1. FINANCIAL STATEMENTS (continued)

NiSource Inc.

Notes to Condensed Consolidated Financial Statements (unaudited) (continued)

Offsetting of Derivative Assets (in millions)
As of December 31, 2013
	Gross Amounts of Recognized Assets		Gross Amounts Offset in the Statement of Financial Position		Net Amounts of Assets Presented in the Statement of Financial Position		Gross Amounts Not Offset in the Statement of Financial Position			Net Amount
Counterparty B	$	2.1	$	—	$	2.1	$	(1.7	)	$	0.4
Other (1)	21.1		—		21.1		—			21.1
Total	$	23.2	$	—	$	23.2	$	(1.7	)	$	21.5

Offsetting of Derivative Liabilities (in millions)
As of December 31, 2013
	Gross Amounts of Recognized Liabilities			Gross Amounts Offset in the Statement of Financial Position		Net Amounts of Liabilities Presented in the Statement of Financial Position			Gross Amounts Not Offset in the Statement of Financial Position		Net Amount
Counterparty B	$	(1.7	)	$	—	$	(1.7	)	$	1.7	$	—
Total	$	(1.7	)	$	—	$	(1.7	)	$	1.7	$	—

⁽¹⁾ Amounts in "Other" include fixed-to-variable interest rate swap agreements entered into by NiSource.

The effect of derivative instruments on the Condensed Statements of Consolidated Income (unaudited) was:

Derivatives in Cash Flow Hedging Relationships

Three Months Ended (in millions)
	Amount of Gain Recognized in OCI on Derivative (Effective Portion)				Location of Loss Reclassified from  AOCI into Income (Effective Portion)	Amount of (Loss) Gain Reclassified from AOCI into Income (Effective Portion)
Derivatives in Cash Flow Hedging Relationships	March 31, 2014		March 31, 2013			March 31, 2014			March 31, 2013
Commodity price risk programs	$	0.1	$	0.1	Cost of Sales	$	(0.1	)	$	0.1
Interest rate risk activities	—		—		Interest expense, net	(0.4		)	(0.4		)
Total	$	0.1	$	0.1		$	(0.5	)	$	(0.3	)

There was no income statement recognition of gains or losses for the ineffective portion and amounts excluded from effectiveness testing for derivatives in cash flow hedging relationships for the three months endedMarch 31, 2014 and 2013.

It is anticipated that during the next twelve months the expiration and settlement of cash flow hedge contracts will result in income statement recognition of amounts currently classified in AOCI of approximately $0.1 million of gain, net of taxes.

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ITEM 1. FINANCIAL STATEMENTS (continued)

NiSource Inc.

Notes to Condensed Consolidated Financial Statements (unaudited) (continued)

Derivatives in Fair Value Hedging Relationships

Three Months Ended (in millions)
Derivatives in Fair Value Hedging Relationships	Location of Loss Recognized in Income on Derivatives	Amount of Loss Recognized in Income on Derivatives
		March 31, 2014			March 31, 2013
Interest rate risk activities	Interest expense, net	$	(10.4	)	$	(9.7	)
Total		$	(10.4	)	$	(9.7	)

Three Months Ended (in millions)
Hedged Item in Fair Value Hedge Relationships	Location of Gain Recognized in Income on Related Hedged Item	Amount of Gain Recognized in Income on Related Hedged Items
		March 31, 2014		March 31, 2013
Fixed-rate debt	Interest expense, net	$	10.4	$	9.7
Total		$	10.4	$	9.7

Derivatives not designated as hedging instruments

Three Months Ended (in millions)
Derivatives Not Designated as Hedging Instruments	Location of Gain (Loss) Recognized in Income on Derivatives	Amount of Realized/Unrealized Gain (Loss) Recognized in Income on Derivatives(1)
		March 31, 2014		March 31, 2013
Commodity price risk programs	Gas Distribution revenues	$	—	$	0.1
Commodity price risk programs	Cost of Sales	6.9		(6.7		)
Commodity price risk programs	(Loss) Income from Discontinued Operations - net of taxes	—		0.2
Total		$	6.9	$	(6.4	)

⁽¹⁾ For the amounts of realized/unrealized gain (loss) recognized in income on derivatives disclosed in the table above, gains of $6.9 million and $6.6 million for the three months ended March 31, 2014 and 2013, respectively, were deferred as allowed per regulatory orders. These amounts will be amortized to income over future periods of up to twelve months as specified in a regulatory order.

NiSource’s derivative instruments measured at fair value as of March 31, 2014 and December 31, 2013 do not contain any credit-risk-related contingent features.

Certain NiSource affiliates have physical commodity purchase agreements that contain “ratings triggers” that require increases in collateral if the credit rating of NiSource or certain of its affiliates are rated below BBB- by Standard & Poor’s or below Baa3 by Moody’s. These agreements are primarily for the physical purchase or sale of natural gas and electricity. The collateral requirement from a downgrade below the ratings trigger levels would amount to approximately $0.9 million. In addition to agreements with ratings triggers, there are some agreements that contain “adequate assurance” or “material adverse change” provisions that could result in additional credit support such as letters of credit and cash collateral to transact business.

NiSource had $5.3 million and $5.9 million of cash on deposit with brokers and MISO for collateral requirements associated with open derivative positions reflected within “Restricted cash” on the Condensed Consolidated Balance Sheets (unaudited) as of March 31, 2014 and December 31, 2013, respectively.

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ITEM 1. FINANCIAL STATEMENTS (continued)

NiSource Inc.

Notes to Condensed Consolidated Financial Statements (unaudited) (continued)

9.    Fair Value

A.    Fair Value Measurements

Recurring Fair Value Measurements. The following tables present financial assets and liabilities measured and recorded at fair value on NiSource’s Condensed Consolidated Balance Sheets (unaudited) on a recurring basis and their level within the fair value hierarchy as of March 31, 2014 and December 31, 2013:

Recurring Fair Value Measurements March 31, 2014 (in millions)	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Balance as of March 31, 2014
Assets
Commodity price risk management assets:
Financial price risk programs	$	3.7	$	—	$	—	$	3.7
Interest rate risk activities	—		10.7		—		10.7
Available-for-sale securities	24.2		95.9		—		120.1
Total	$	27.9	$	106.6	$	—	$	134.5
Liabilities
Commodity price risk management liabilities:
Financial price risk programs	$	0.1	$	—	$	0.3	$	0.4
Total	$	0.1	$	—	$	0.3	$	0.4

Recurring Fair Value Measurements December 31, 2013 (in millions)	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Balance as of December 31, 2013
Assets
Commodity price risk management assets:
Financial price risk programs	$	2.1	$	—	$	—	$	2.1
Interest rate risk activities	—		21.1		—		21.1
Available-for-sale securities	25.3		96.1		—		121.4
Total	$	27.4	$	117.2	$	—	$	144.6
Liabilities
Commodity price risk management liabilities:
Financial price risk programs	$	1.6	$	—	$	0.1	$	1.7
Total	$	1.6	$	—	$	0.1	$	1.7

Price risk management assets and liabilities include commodity exchange-traded and non-exchange-based derivative contracts. Exchange-traded derivative contracts are based on unadjusted quoted prices in active markets and are classified within Level 1. These financial assets and liabilities are secured with cash on deposit with the exchange; therefore nonperformance risk has not been incorporated into these valuations. Certain non-exchange-traded derivatives are valued using broker or over-the-counter, on-line exchanges. In such cases, these non-exchange-traded derivatives are classified within Level 2. Non-exchange-based derivative instruments include swaps, forwards, and options. In certain instances, these instruments may utilize models to measure fair value. NiSource uses a similar model to value similar instruments. Valuation models utilize various inputs that include quoted prices for similar assets or liabilities in active markets, quoted prices for identical or similar assets or liabilities in markets that are not active, other observable inputs for the asset or liability, and market-corroborated inputs, i.e., inputs derived principally from or corroborated by observable market data by correlation or other means. Where observable inputs are available for substantially the full term of the asset or liability, the instrument is categorized in Level 2. Certain derivatives trade in less active markets with a lower availability of pricing information and models may be utilized in the valuation. When such inputs have a significant impact on the measurement

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ITEM 1. FINANCIAL STATEMENTS (continued)

NiSource Inc.

Notes to Condensed Consolidated Financial Statements (unaudited) (continued)

of fair value, the instrument is categorized in Level 3. Credit risk is considered in the fair value calculation of derivative instruments that are not exchange-traded. Credit exposures are adjusted to reflect collateral agreements which reduce exposures. As of March 31, 2014 and December 31, 2013, there were no material transfers between fair value hierarchies. Additionally, there were no changes in the method or significant assumptions used to estimate the fair value of NiSource’s financial instruments.

Price risk management assets also include fixed-to-floating interest-rate swaps, which are designated as fair value hedges, as a means to achieve NiSource’s targeted level of variable-rate debt as a percent of total debt. NiSource uses a calculation of future cash inflows and estimated future outflows related to the swap agreements, which are discounted and netted to determine the current fair value. Additional inputs to the present value calculation include the contract terms, as well as market parameters such as current and projected interest rates and volatility. As they are based on observable data and valuations of similar instruments, the interest-rate swaps are categorized in Level 2 in the fair value hierarchy. Credit risk is considered in the fair value calculation of the interest rate swap.

Available-for-sale securities are investments pledged as collateral for trust accounts related to NiSource’s wholly-owned insurance company. Available-for-sale securities are included within “Other investments” in the Condensed Consolidated Balance Sheets (unaudited). Securities classified within Level 1 include U.S. Treasury debt securities which are highly liquid and are actively traded in over-the-counter markets. NiSource values corporate and mortgage-backed debt securities using a matrix pricing model that incorporates market-based information. These securities trade less frequently and are classified within Level 2. Total gains and losses from available-for-sale securities are included in other comprehensive income (loss). The amortized cost, gross unrealized gains and losses, and fair value of available-for-sale debt securities at March 31, 2014 and December 31, 2013 were:

March 31, 2014 (in millions)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
Available-for-sale debt securities
U.S. Treasury	$	27.0	$	0.2	$	(0.4	)	$	26.8
Corporate/Other	93.0		1.2		(0.9		)	93.3
Total Available-for-sale debt securities	$	120.0	$	1.4	$	(1.3	)	$	120.1
December 31, 2013 (in millions)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
Available-for-sale debt securities
U.S. Treasury	$	30.3	$	0.3	$	(0.5	)	$	30.1
Corporate/Other	91.5		1.1		(1.3		)	91.3
Total Available-for-sale debt securities	$	121.8	$	1.4	$	(1.8	)	$	121.4

For the three months ended March 31, 2014 and 2013, the net realized gain on the sale of available-for-sale U.S. Treasury debt securities was $0.1 million and $0.2 million, respectively. For the three months ended March 31, 2014 and 2013, the net realized gain on sale of available-for-sale Corporate/Other bond debt securities was $0.1 million and $0.2 million, respectively.

The cost of maturities sold is based upon specific identification. At March 31, 2014, approximately $2.6 million of U.S. Treasury debt securities have maturities of less than a year while the remaining securities have maturities of greater than one year. At March 31, 2014, approximately $4.4 million of Corporate/Other bonds have maturities of less than a year while the remaining securities have maturities of greater than one year.

There are no material items in the fair value reconciliation of Level 3 assets and liabilities measured at fair value on a recurring basis for the three months ended March 31, 2014 and 2013.

Non-recurring Fair Value Measurements. There were no significant non-recurring fair value measurements recorded during the three months ended March 31, 2014.

In January 2013, NiSource sold the service plan and leasing business lines of its Retail Services business. The disposed business lines were included in the Columbia Distribution Operations reporting unit and the NIPSCO Gas Distribution Operations reporting unit. Goodwill associated with the disposed business lines was included in the carrying amount of the business lines in determining the gain on disposal. The amount of the goodwill included in the carrying amount was based on the relative fair values of the

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ITEM 1. FINANCIAL STATEMENTS (continued)

NiSource Inc.

Notes to Condensed Consolidated Financial Statements (unaudited) (continued)

business lines disposed of and the portion of the reporting units that were retained. The fair value of the disposed business lines was determined by using the selling price of the business lines. The fair value of the reporting units that were retained was determined by a weighted average of income and market approaches. This approach was similar to the process undertaken to calculate the fair value of the reporting units for the goodwill impairment test conducted on May 1, 2012. These approaches are further discussed in NiSource’s Annual Report on Form 10-K for the fiscal year ended December 31, 2012 and yield fair values considered to be at Level 3 of the fair value hierarchy. The respective fair value of the disposed business lines was divided by the fair value of the reporting units to which the disposed business lines belonged. These percentages were then applied to those goodwill balances to determine their allocations. As a result of these procedures, NiSource recorded a disposal of goodwill of approximately $11.0 million during the first quarter of 2013. This amount is included within the "Gain on Disposition of Discontinued Operations - net of taxes" on the Condensed Statements of Consolidated Income (unaudited).

B.    Other Fair Value Disclosures for Financial Instruments. The carrying amount of cash and cash equivalents, restricted cash, notes receivable, customer deposits and short-term borrowings is a reasonable estimate of fair value due to their liquid or short-term nature. NiSource’s long-term borrowings are recorded at historical amounts unless designated as a hedged item in a fair value hedge.

The following methods and assumptions were used to estimate the fair value of each class of financial instruments for which it is practicable to estimate fair value.

Long-term Debt. The fair values of these securities are estimated based on the quoted market prices for the same or similar issues or on the rates offered for securities of the same remaining maturities. Certain premium costs associated with the early settlement of long-term debt are not taken into consideration in determining fair value. These fair value measurements are classified as Level 2 within the fair value hierarchy. For the three months endedMarch 31, 2014 and 2013, there were no changes in the method or significant assumptions used to estimate the fair value of the financial instruments.

The carrying amount and estimated fair values of financial instruments were as follows:

(in millions)	Carrying Amount as of March 31, 2014		Estimated Fair Value as of March 31, 2014		Carrying Amount as of Dec. 31, 2013		Estimated Fair Value as of Dec. 31, 2013
Long-term debt (including current portion)	$	8,169.0	$	8,944.1	$	8,135.3	$	8,697.3

10.    Transfers of Financial Assets

Transfers of accounts receivable are accounted for as secured borrowings resulting in the recognition of short-term borrowings on the Condensed Consolidated Balance Sheets (unaudited). The maximum amount of debt that can be recognized related to NiSource’s accounts receivable programs is $515 million.

All accounts receivables sold to the commercial paper conduits are valued at face value, which approximates fair value due to their short-term nature. The amount of the undivided percentage ownership interest in the accounts receivables sold is determined in part by required loss reserves under the agreements. Below is information about the accounts receivable securitization agreements entered into by NiSource’s subsidiaries.

Columbia of Ohio is under an agreement to sell, without recourse, substantially all of its trade receivables, as they originate, to CGORC, a wholly-owned subsidiary of Columbia of Ohio. CGORC, in turn, is party to an agreement with BTMU and BNS under the terms of which it sells an undivided percentage ownership interest in its accounts receivable to commercial paper conduits sponsored by BTMU and BNS. This agreement was last renewed on October 18, 2013. The maximum seasonal program limit under the terms of the new agreement remains at $240 million. The current agreement expires on October 17, 2014, and can be further renewed if mutually agreed to by all parties. As of March 31, 2014, $240.0 million of accounts receivable had been transferred by CGORC. CGORC is a separate corporate entity from NiSource and Columbia of Ohio, with its own separate obligations, and upon a liquidation of CGORC, CGORC’s obligations must be satisfied out of CGORC’s assets prior to any value becoming available to CGORC’s stockholder.

NIPSCO is under an agreement to sell, without recourse, substantially all of its trade receivables, as they originate, to NARC, a wholly-owned subsidiary of NIPSCO. NARC, in turn, is party to an agreement with PNC and Mizuho under the terms of which it sells an undivided percentage ownership interest in its accounts receivable to commercial paper conduits sponsored by PNC and

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ITEM 1. FINANCIAL STATEMENTS (continued)

NiSource Inc.

Notes to Condensed Consolidated Financial Statements (unaudited) (continued)

Mizuho. This agreement was last renewed on August 28, 2013. The maximum seasonal program limit under the terms of the new agreement remains at $200 million. The current agreement expires on August 27, 2014, and can be further renewed if mutually agreed to by all parties. As of March 31, 2014, $200.0 million of accounts receivable had been transferred by NARC. NARC is a separate corporate entity from NiSource and NIPSCO, with its own separate obligations, and upon a liquidation of NARC, NARC’s obligations must be satisfied out of NARC’s assets prior to any value becoming available to NARC’s stockholder.

Columbia of Pennsylvania is under an agreement to sell, without recourse, substantially all of its trade receivables, as they originate, to CPRC, a wholly-owned subsidiary of Columbia of Pennsylvania. CPRC, in turn, is party to an agreement with BTMU under the terms of which it sells an undivided percentage ownership interest in its accounts receivable to a commercial paper conduit sponsored by BTMU. The maximum seasonal program limit under the terms of the agreement is $75 million. The agreement with BTMU was renewed on March 11, 2014, having a current scheduled termination date of March 10, 2015, and can be further renewed if mutually agreed to by both parties. As of March 31, 2014, $75.0 million of accounts receivable had been transferred by CPRC. CPRC is a separate corporate entity from NiSource and Columbia of Pennsylvania, with its own separate obligations, and upon a liquidation of CPRC, CPRC’s obligations must be satisfied out of CPRC’s assets prior to any value becoming available to CPRC’s stockholder.

The following table reflects the gross and net receivables transferred as well as short-term borrowings related to the securitization transactions as of March 31, 2014 and December 31, 2013 for Columbia of Ohio, NIPSCO and Columbia of Pennsylvania:

(in millions)	March 31, 2014		December 31, 2013
Gross Receivables	$	811.7	$	610.9
Less: Receivables not transferred	296.7		345.8
Net receivables transferred	$	515.0	$	265.1
Short-term debt due to asset securitization	$	515.0	$	265.1

Columbia of Ohio, NIPSCO and Columbia of Pennsylvania remain responsible for collecting on the receivables securitized and the receivables cannot be sold to another party.

11.    Goodwill

NiSource considered whether there were any events or changes in circumstances subsequent to the annual test that would reduce the fair value of any of the reporting units below their carrying amounts and necessitate another goodwill impairment test. No such indicators were noted that would require a subsequent goodwill impairment testing during the first quarter of 2014.

During the first quarter of 2013, as part of the sale of the service plan and leasing business lines of its Retail Services business, NiSource allocated $10.0 million of goodwill from Columbia Distribution Operations to the sale and allocated $1.0 million of goodwill from NIPSCO Gas Distribution Operations to the sale. Refer to Note 5 "Discontinued Operations and Assets and Liabilities Held for Sale" for more information.

12.    Income Taxes

NiSource’s interim effective tax rates reflect the estimated annual effective tax rates for 2014 and 2013, adjusted for tax expense associated with certain discrete items. The effective tax rates for the three months ended March 31, 2014 and 2013 were 37.9% and 35.4%, respectively. These effective tax rates differ from the Federal tax rate of 35% primarily due to the effects of tax credits, state income taxes, utility rate-making, and other permanent book-to-tax differences. The 2.5% increase from 2013 to 2014 is primarily due to the impact of the Indiana rate change, see below for further information.

On March 25, 2014, the governor of Indiana signed into law Senate Bill 1, which among other things, lowers the corporate income tax rate from 6.5% to 4.9% over six years beginning on July 1, 2015. The reduction in the tax rate will impact deferred income taxes and tax related regulatory assets and liabilities recoverable in the rate-making process. In addition, other deferred tax assets and liabilities, primarily deferred tax assets related to the Indiana net operating loss carry forward, will be reduced to reflect the lower rate at which these temporary differences and tax benefits will be realized. In the first quarter of 2014, NiSource recorded tax expense of $7.1 million to reflect the effect of this rate change. This expense is largely attributable to the remeasurement of the Indiana net operating loss at the 4.9% rate. The majority of NiSource's tax temporary differences are related to NIPSCO's utility plant. The remeasurement of these temporary differences at 4.9% was recorded as a reduction of a regulatory asset.

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ITEM 1. FINANCIAL STATEMENTS (continued)

NiSource Inc.

Notes to Condensed Consolidated Financial Statements (unaudited) (continued)

On March 7, 2013, the Congressional Joint Committee on Taxation took no exception to the conclusions reached by the IRS in its 2008-2010 audit examination. Therefore, in the first quarter of 2013, NiSource recognized a federal income tax receivable of $15.9 million that was related to the 2008 and 2009 tax years and increases in net operating loss carryforwards of $0.6 million that was related to uncertain tax positions in the 2010-2012 tax years. NiSource received payments of $75.1 million in March 2013 and $70.6 million in April 2013 of principal and interest from the IRS related to the audit examination. The recognition of the receivables and net operating loss carryforwards did not materially affect tax expense or net income.

On January 2, 2013, the President signed into law the American Taxpayer Relief Act of 2012 ("ATRA"). ATRA, among other things, extended retroactively the research credit under Internal Revenue Code section 41 until December 31, 2013, and also extended and modified 50% bonus depreciation for 2013. In general, 50% bonus depreciation will be available for property placed in service before January 1, 2014, or in the case of certain property having longer production periods, before January 1, 2015. NiSource recorded the effects of ATRA in the first quarter of 2013. The retroactive extension of the research credit did not have a significant effect on net income.

There were no material changes recorded in the first quarter of 2014 to NiSource's uncertain tax positions as of December 31, 2013.

13.    Pension and Other Postretirement Benefits

NiSource provides defined contribution plans and noncontributory defined benefit retirement plans that cover its employees. Benefits under the defined benefit retirement plans reflect the employees’ compensation, years of service and age at retirement. Additionally, NiSource provides health care and life insurance benefits for certain retired employees. The majority of employees may become eligible for these benefits if they reach retirement age while working for NiSource. The expected cost of such benefits is accrued during the employees’ years of service. Current rates of rate-regulated companies include postretirement benefit costs, including amortization of the regulatory assets that arose prior to inclusion of these costs in rates. For most plans, cash contributions are remitted to grantor trusts.

For the three months ended March 31, 2014, NiSource has contributed $0.7 million to its pension plans and $9.2 million to its other postretirement benefit plans.

The following table provides the components of the plans’ net periodic benefits cost for the three months ended March 31, 2014 and 2013:

	Pension Benefits						Other Postretirement Benefits
Three Months Ended March 31, (in millions)	2014			2013			2014			2013
Components of Net Periodic Benefit Cost
Service cost	$	8.7		$	9.4		$	2.3		$	3.0
Interest cost	27.3			24.3			8.2			8.1
Expected return on assets	(45.3		)	(42.4		)	(9.1		)	(7.6		)
Amortization of transition obligation	—			—			—			0.1
Amortization of prior service cost (credit)	—			0.1			(0.6		)	(0.2		)
Recognized actuarial loss	11.9			20.7			—			2.8
Settlement loss	—			20.7			—			—
Total Net Periodic Benefit Costs	$	2.6		$	32.8		$	0.8		$	6.2

In 2013, NiSource pension plans had lump sum payouts exceeding the plan's 2013 service cost plus interest cost and, therefore, settlement accounting was required.

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ITEM 1. FINANCIAL STATEMENTS (continued)

NiSource Inc.

Notes to Condensed Consolidated Financial Statements (unaudited) (continued)

14.    Variable Interests and Variable Interest Entities

In general, a VIE is an entity that (1) has an insufficient amount of at-risk equity to permit the entity to finance its activities without additional financial subordinated support provided by any parties, (2) whose at-risk equity owners, as a group, do not have power, through voting rights or similar rights, to direct activities of the entity that most significantly impact the entity’s economic performance or (3) whose at-risk owners do not absorb the entity’s losses or receive the entity’s residual return. A VIE is required to be consolidated by a company if that company is determined to be the primary beneficiary of the VIE.

NiSource consolidates those VIEs for which it is the primary beneficiary. NiSource considers quantitative and qualitative elements in determining the primary beneficiary. Qualitative measures include the ability to control an entity and the obligation to absorb losses or the right to receive benefits.

NiSource’s analysis includes an assessment of guarantees, operating leases, purchase agreements, and other contracts, as well as its investments and joint ventures. For items that have been identified as variable interests, or where there is involvement with an identified VIE, an in-depth review of the relationship between the relevant entities and NiSource is made to evaluate qualitative and quantitative factors to determine the primary beneficiary, if any, and whether additional disclosures would be required under the current standard.

NIPSCO has a service agreement with Pure Air, a general partnership between Air Products and Chemicals, Inc. and First Air Partners LP, under which Pure Air provides scrubber services to reduce sulfur dioxide emissions for Units 7 and 8 at the Bailly Generating Station. NiSource has made an exhaustive effort to obtain information needed from Pure Air to determine the status of Pure Air as a VIE. However, NIPSCO has not been able to obtain this information and as a result, it is unclear whether Pure Air is a VIE and if NIPSCO is the primary beneficiary. NIPSCO will continue to request the information required to determine whether Pure Air is a VIE. NIPSCO has no exposure to loss related to the service agreement with Pure Air and payments under this agreement were $5.4 million and $5.6 million for the three months ended March 31, 2014 and 2013, respectively.

15.    Short-Term Borrowings

On September 30, 2013, NiSource Finance amended its existing revolving credit facility with a syndicate of banks led by Barclays Capital to expand capacity to $2.0 billion and extend the termination date to September 28, 2018. The purpose of the facility is to fund ongoing working capital requirements including the provision of liquidity support for NiSource’s $1.5 billion commercial paper program, provide for issuance of letters of credit, and also for general corporate purposes. At March 31, 2014, NiSource had no outstanding borrowings under this facility.

NiSource Finance's commercial paper program has a program limit of up to $1.5 billion with a dealer group comprised of Barclays, Citigroup, Credit Suisse, RBS and Wells Fargo. Commercial paper issuances are supported by available capacity under NiSource’s $2.0 billion unsecured revolving credit facility. At March 31, 2014, NiSource had $297.5 million of commercial paper outstanding.

As of March 31, 2014, NiSource had $30.5 million of stand-by letters of credit outstanding of which $14.3 million were under the revolving credit facility. At December 31, 2013, NiSource had $31.6 million of stand-by letters of credit outstanding of which $14.3 million were under the revolving credit facility.

Transfers of accounts receivable are accounted for as secured borrowings resulting in the recognition of short-term debt on the Condensed Consolidated Balance Sheets (unaudited) in the amount of $515.0 million and $265.1 million as of March 31, 2014 and December 31, 2013, respectively. Refer to Note 10, “Transfers of Financial Assets,” for additional information.

(in millions)	March 31, 2014		December 31, 2013
Commercial Paper weighted average interest rate of 0.55% and 0.70% at March 31, 2014 and December 31, 2013, respectively.	$	297.5	$	433.6
Accounts receivable securitization facility borrowings	515.0		265.1
Total short-term borrowings	$	812.5	$	698.7

Given their turnover is less than 90 days, cash flows related to the borrowings and repayments of the items listed above are presented net in the Condensed Statements of Consolidated Cash Flows (unaudited).

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ITEM 1. FINANCIAL STATEMENTS (continued)

NiSource Inc.

Notes to Condensed Consolidated Financial Statements (unaudited) (continued)

16.    Share-Based Compensation

The stockholders approved and adopted the NiSource Inc. 2010 Omnibus Incentive Plan (the “Omnibus Plan”), at the Annual Meeting of Stockholders held on May 11, 2010. The Omnibus Plan provides for awards to employees and non-employee directors of incentive and nonqualified stock options, stock appreciation rights, restricted stock and restricted stock units, performance shares, performance units, cash-based awards and other stock-based awards. The Omnibus Plan provides that the number of shares of common stock of NiSource available for awards is 8,000,000 plus the number of shares subject to outstanding awards granted under either the 1994 Plan or the Director Plan (described below) that expire or terminate for any reason. No further awards are permitted to be granted under the 1994 Plan or the Director Plan. At March 31, 2014, there were 6,162,981 shares reserved for future awards under the Omnibus Plan.

Prior to May 11, 2010, NiSource issued long-term equity incentive grants to key management employees under a long-term incentive plan approved by stockholders on April 13, 1994 (“1994 Plan”). The types of equity awards previously authorized under the 1994 Plan did not significantly differ from those permitted under the Omnibus Plan.

NiSource recognized stock-based employee compensation expense of $5.3 million and $4.2 million for the three months ended March 31, 2014 and 2013, respectively, as well as related tax benefits of $2.0 million and $1.5 million, respectively.

As of March 31, 2014, the total remaining unrecognized compensation cost related to nonvested awards amounted to $31.8 million, which will be amortized over the weighted-average remaining requisite service period of 2.3 years.

Stock Options. As of March 31, 2014, approximately 0.2 million options were outstanding and exercisable with a weighted average strike price of $22.62. No options were granted during the three months endedMarch 31, 2014 and 2013. As of March 31, 2014, the aggregate intrinsic value for the options outstanding and exercisable was $3.1 million. During the three months ended March 31, 2014 and 2013, cash received from the exercise of options was $3.9 million and $13.1 million, respectively.

Restricted Stock Units and Restricted Stock. During the three months endedMarch 31, 2014, NiSource granted 67,594 restricted stock units and shares of restricted stock, subject to service conditions. The total grant date fair value of restricted stock units and shares of restricted stock was $2.1 million, based on the average market price of NiSource’s common stock at the date of each grant less the present value of any dividends not received during the vesting period, which will be expensed, net of forfeitures, over the vesting period which is generally three years. If the employee terminates employment before the service conditions lapse due to (1) Retirement or Disability (as defined in the award agreement), or (2) death, the employment conditions will lapse with respect to a pro rata portion of the shares of restricted stock and restricted stock units on the date of termination. In the event of a Change-in-Control (as defined in the award agreement), all unvested shares of restricted stock and restricted stock units granted during the three months ended March 31, 2014 will vest upon termination of employment in connection with a Change-in-Control. Termination due to any other reason will result in all unvested shares of restricted stock and restricted stock units awarded being forfeited effective on the employee’s date of termination. As of March 31, 2014, 324,585 nonvested (all of which are expected to vest) restricted stock units and shares of restricted stock were granted and outstanding.

Performance Shares. During the three months endedMarch 31, 2014, NiSource granted 525,173 performance shares subject to service and performance conditions. The grant date fair value of the awards was $16.3 million, based on the average market price of NiSource’s common stock at the date of each grant less the present value of dividends not received during the vesting period which will be expensed, net of forfeitures, over the three year requisite service period. The performance conditions are based on achievement of cumulative net operating earnings per share, a non-GAAP financial measure that NiSource defines as income from continuing operations adjusted for certain items; and relative total shareholder return, a non-GAAP market measure that NiSource defines as the annualized growth in the dividends and share price of a share of NiSource’s common stock (calculated using a 20 trading day average of NiSource’s closing price, over a period beginning December 31, 2013 and ending on December 31, 2016) compared to the total shareholder return performance of a predetermined peer group of companies. The service conditions lapse on February 28, 2017 when the shares vest provided the performance criteria are satisfied. In general, if the employee terminates employment before February 28, 2017 due to (1) Retirement or Disability (as defined in the award agreement), or (2) death, the employment conditions will lapse with respect to a pro rata portion of the performance shares payable at target on the date of termination provided the performance criteria are met. In the event of a Change-in-Control (as defined in the award agreement), all unvested performance shares will immediately vest. Termination due to any other reason will result in all performance shares awarded being forfeited effective on the employee’s date of termination. As of March 31, 2014, 1,878,558 nonvested performance shares were granted and outstanding.

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ITEM 1. FINANCIAL STATEMENTS (continued)

NiSource Inc.

Notes to Condensed Consolidated Financial Statements (unaudited) (continued)

Non-employee Director Awards. As of May 11, 2010, awards to non-employee directors may be made only under the Omnibus Plan. Currently, restricted stock units are granted annually to non-employee directors, subject to a non-employee director’s election to defer receipt of such restricted stock unit award. The non-employee director’s restricted stock units vest on the last day of the non-employee director’s annual term corresponding to the year the restricted stock units were awarded subject to special pro-rata vesting rules in the event of Retirement or Disability (as defined in the award agreement), or death. The vested restricted stock units are payable as soon as practicable following vesting except as otherwise provided pursuant to the non-employee director’s election to defer. As of March 31, 2014, 144,578 restricted stock units were outstanding to non-employee directors under the Omnibus Plan.

Only restricted stock units remain outstanding under the prior plan for non-employee directors, the Amended and Restated Non-employee Director Stock Incentive Plan (the “Director Plan”). All such awards are fully vested and shall be distributed to the directors upon their separation from the Board. As of March 31, 2014, 147,845 restricted stock units remained outstanding under the Director Plan and as noted above no further shares may be awarded under the Director Plan.

401(k) Match, Profit Sharing and Company Contribution. NiSource has a voluntary 401(k) savings plan covering eligible employees that allows for periodic discretionary matches as a percentage of each participant’s contributions payable in shares of common stock. NiSource also has a retirement savings plan that provides for discretionary profit sharing contributions payable in shares of common stock to eligible employees based on earnings results; and eligible exempt employees hired after January 1, 2010, receive a non-elective company contribution of three percent of eligible pay payable in shares of common stock. For the quarters ended March 31, 2014 and 2013, NiSource recognized 401(k) match, profit sharing and non-elective contribution expense of $8.5 million and $6.4 million, respectively.

17.    Other Commitments and Contingencies

A.    Guarantees and Indemnities. As a part of normal business, NiSource and certain subsidiaries enter into various agreements providing financial or performance assurance to third parties on behalf of certain subsidiaries. Such agreements include guarantees and stand-by letters of credit. These agreements are entered into primarily to support or enhance the creditworthiness otherwise attributed to a subsidiary on a stand-alone basis, thereby facilitating the extension of sufficient credit to accomplish the subsidiaries’ intended commercial purposes. The total guarantees and indemnities in existence at March 31, 2014 and the years in which they expire were:

(in millions)	Total		2014		2015		2016		2017		2018		After
Guarantees of subsidiaries debt	$	7,710.5	$	500.0	$	230.0	$	616.5	$	507.0	$	800.0	$	5,057.0
Accounts receivable securitization	515.0		515.0		—		—		—		—		—
Lines of credit	297.5		297.5		—		—		—		—		—
Letters of credit	30.5		12.6		17.9		—		—		—		—
Other guarantees	142.4		45.4		35.3		—		—		—		61.7
Total commercial commitments	$	8,695.9	$	1,370.5	$	283.2	$	616.5	$	507.0	$	800.0	$	5,118.7

Guarantees of Subsidiaries Debt. NiSource has guaranteed the payment of $7.7 billion of debt for various wholly-owned subsidiaries including NiSource Finance and Columbia of Massachusetts, and through a support agreement, Capital Markets, which is reflected on NiSource’s Condensed Consolidated Balance Sheets (unaudited). The subsidiaries are required to comply with certain covenants under the debt indenture and in the event of default, NiSource would be obligated to pay the debt’s principal and related interest. NiSource does not anticipate its subsidiaries will have any difficulty maintaining compliance. On October 3, 2011, NiSource executed a Second Supplemental Indenture to the original Columbia of Massachusetts Indenture dated April 1, 1991, for the specific purpose of guaranteeing Columbia of Massachusetts’ outstanding medium-term notes.

Lines and Letters of Credit and Accounts Receivable Advances. On September 30, 2013, NiSource Finance amended its existing revolving credit facility with a syndicate of banks led by Barclays Capital to expand capacity to $2.0 billion and extend the termination date to September 28, 2018. The purpose of the facility is to fund ongoing working capital requirements including the provision of liquidity support for NiSource’s $1.5 billion commercial paper program, provide for the issuance of letters of credit, and also for general corporate purposes. At March 31, 2014, NiSource had no borrowings under its five-year revolving credit facility, $297.5 million in commercial paper outstanding and $515.0 million outstanding under its accounts receivable securitization

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ITEM 1. FINANCIAL STATEMENTS (continued)

NiSource Inc.

Notes to Condensed Consolidated Financial Statements (unaudited) (continued)

agreements. At March 31, 2014, NiSource issued stand-by letters of credit of approximately $30.5 million for the benefit of third parties. See Note 15, “Short-Term Borrowings,” for additional information.

Other Guarantees or Obligations. NiSource has additional purchase and sales agreement guarantees totaling $73.5 million, which guarantee performance of the seller’s covenants, agreements, obligations, liabilities, representations and warranties under the agreements. No amounts related to the purchase and sales agreement guarantees are reflected in the Condensed Consolidated Balance Sheets (unaudited). Management believes that the likelihood NiSource would be required to perform or otherwise incur any significant losses associated with any of the aforementioned guarantees is remote.

NiSource has on deposit a letter of credit with Union Bank, N.A., Collateral Agent, in a debt service reserve account in association with Millennium's notes as required under the Deposit and Disbursement Agreement that governs the Millennium notes. This account is to be drawn upon by the note holders in the event that Millennium is delinquent on its principal and interest payments. The value of NiSource’s letter of credit represents 47.5% (NiSource’s ownership percentage in Millennium) of the debt service reserve account requirement, or $16.2 million. The total exposure for NiSource is $16.2 million. NiSource has an accrued liability of $1.5 million related to the inception date fair value of this guarantee as of March 31, 2014.

NiSource has issued other guarantees supporting derivative related payments associated with interest rate swap agreements issued by NiSource Finance, operating leases for many of its subsidiaries and for other agreements entered into by its current and former subsidiaries.

B.    Other Legal Proceedings. In the normal course of its business, NiSource and its subsidiaries have been named as defendants in various legal proceedings. In the opinion of management, the ultimate disposition of these currently asserted claims will not have a material impact on NiSource’s consolidated financial statements.

C.    Environmental Matters. NiSource operations are subject to environmental statutes and regulations related to air quality, water quality, hazardous waste and solid waste. NiSource believes that it is in substantial compliance with those environmental regulations currently applicable to its operations and believes that it has all necessary permits to conduct its operations.

It is management’s continued intent to address environmental issues in cooperation with regulatory authorities in such a manner as to achieve mutually acceptable compliance plans. However, there can be no assurance that fines and penalties will not be incurred. Management expects a significant portion of environmental assessment and remediation costs to be recoverable through rates for certain NiSource companies.

As of March 31, 2014 and December 31, 2013, NiSource had recorded an accrual of approximately $135.1 million and $143.9 million, respectively, to cover environmental remediation at various sites. The current portion of this accrual is included in "Legal and environmental" in the Condensed Consolidated Balance Sheets (unaudited). The noncurrent portion is included in "Other noncurrent liabilities" in the Condensed Consolidated Balance Sheets (unaudited). NiSource accrues for costs associated with environmental remediation obligations when the incurrence of such costs is probable and the amounts can be reasonably estimated. The original estimates for cleanup can differ materially from the amount ultimately expended. The actual future expenditures depend on many factors, including currently enacted laws and regulations, the nature and extent of contamination, the method of cleanup, and the availability of cost recovery from customers. These expenditures are not currently estimable at some sites. NiSource periodically adjusts its accrual as information is collected and estimates become more refined.

Air

The actions listed below could require further reductions in emissions from various emission sources. NiSource will continue to closely monitor developments in these matters.

Climate Change. Future legislative and regulatory programs could significantly restrict emissions of GHGs or could impose a cost or tax on GHG emissions.

In the first quarter of 2012, the EPA proposed an output-based carbon standard for new power plants. On September 20, 2013, the EPA announced withdrawal of the proposed standard and released a new proposal. The newly proposed standard would, for the first time, set national limits on the amount of carbon emissions allowed from new power plants. Compliance for new coal-fired plants may need to include capture and sequestration of carbon dioxide at coal-fired power plants. In addition, the EPA stated that it intends to regulate existing sources with a proposed rule in 2014.

If the EPA develops a GHG new source performance standard for existing units or if a federal or state comprehensive climate change bill were to be enacted into law, the impact on NiSource's financial performance would depend on a number of factors,

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ITEM 1. FINANCIAL STATEMENTS (continued)

NiSource Inc.

Notes to Condensed Consolidated Financial Statements (unaudited) (continued)

including the overall level of required GHG reductions, the degree to which offsets may be used for compliance, and the amount of recovery allowed from customers. Comprehensive federal or state GHG regulation could result in additional expense or compliance costs that may not be fully recoverable from customers and could materially impact NiSource's financial results.

National Ambient Air Quality Standards. The CAA requires the EPA to set national air quality standards (the NAAQS) for particulate matter and five other pollutants considered harmful to public health and the environment. Periodically the EPA imposes new or modifies existing NAAQS. States that contain areas that do not meet the new or revised standards must take steps to maintain or achieve compliance with the standards. These steps could include additional pollution controls on boilers, engines, turbines, and other facilities owned by electric generation, gas distribution, and gas transmission operations.

The following NAAQS were recently added or modified:

Particulate Matter: In December 2009, the EPA issued area designations for the 2006 24-hour PM_2.5 standard, and several counties in which NiSource operates were designated as non-attainment. In addition, a final rule was promulgated in December 2012 that lowered the annual PM_2.5 standard from 15 to 12 µg/m³. NiSource will continue to monitor these matters and cannot estimate their impact at this time.

Ozone (eight hour): On September 2, 2011, the EPA announced it would implement its 2008 eight-hour ozone NAAQS rather than tightening the standard in 2012. The EPA will review, and possibly propose a new standard in 2014. In addition, the EPA has designated the Chicago metropolitan area, including the area in which NIPSCO operates one of its electric generation facilities, as non-attainment for ozone. NiSource will continue to monitor this matter and cannot estimate the impact of any new rules at this time.

Nitrogen Dioxide (NO₂): The EPA revised the NO₂ NAAQS by adding a one-hour standard while retaining the annual standard. The new standard could impact some NiSource combustion sources. The EPA designated all areas of the country as unclassifiable/attainment in January 2012. After the establishment of a new monitoring network and possible modeling implementation, areas will potentially be re-designated sometime in 2016. States with areas that do not meet the standard will be required to develop rules to bring areas into compliance within five years of designation. Additionally, under certain permitting circumstances emissions from some existing NiSource combustion sources may need to be assessed and mitigated. NiSource will continue to monitor this matter and cannot estimate the impact of these rules at this time.

Waste

NiSource subsidiaries are potentially responsible parties at waste disposal sites under the CERCLA (commonly known as Superfund) and similar state laws. Additionally, a program has been instituted to identify and investigate former MGP sites where Gas Distribution Operations subsidiaries or predecessors may have liability. The program has identified 67 such sites where liability is probable. Remedial actions at many of these sites are being overseen by state or federal environmental agencies through consent agreements or voluntary remediation agreements.

NiSource utilizes a probabilistic model to estimate its future remediation costs related to its MGP sites. The model was prepared with the assistance of a third party and incorporates NiSource and general industry experience with remediating MGP sites. NiSource completes an annual refresh of the model in the second quarter of each fiscal year. No material changes to the estimated liability were noted as a result of the refresh completed as of June 30, 2013. The total estimated liability at NiSource related to the facilities subject to remediation was $123.2 million and $129.5 million at March 31, 2014 and December 31, 2013, respectively. The liability represents NiSource’s best estimate of the probable cost to remediate the facilities. NiSource believes that it is reasonably possible that remediation costs could vary by as much as $25 million in addition to the costs noted above. Remediation costs are estimated based on the best available information, applicable remediation standards at the balance sheet date, and experience with similar facilities.

Additional Issues Related to Individual Business Segments

The sections below describe various regulatory actions that affect Columbia Pipeline Group Operations and Electric Operations.

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ITEM 1. FINANCIAL STATEMENTS (continued)

NiSource Inc.

Notes to Condensed Consolidated Financial Statements (unaudited) (continued)

Columbia Pipeline Group Operations.

Waste

Columbia Transmission continues to conduct characterization and remediation activities at specific sites under a 1995 AOC (subsequently modified in 1996 and 2007). NiSource utilizes a probabilistic model to estimate its future remediation costs related to the 1995 AOC. The model was prepared with the assistance of a third party and incorporates NiSource and general industry experience with remediating sites. NiSource completes an annual refresh of the model in the second quarter of each fiscal year. No material changes to the liability were noted as a result of the refresh completed as of June 30, 2013. The total remaining liability at Columbia Transmission related to the facilities subject to remediation was $6.4 million and $8.7 million at March 31, 2014 and December 31, 2013, respectively. The liability represents Columbia Transmission’s best estimate of the cost to remediate the facilities or manage the sites. Remediation costs are estimated based on the information available, applicable remediation standards, and experience with similar facilities. Columbia Transmission expects that the remediation for these facilities will be substantially completed in 2015.

Electric Operations.

Air

NIPSCO is subject to a number of new air-quality mandates in the next several years. These mandates require NIPSCO to make capital improvements to its electric generating stations. The cost of capital improvements is estimated to be $860 million, of which approximately $240.0 million remains to be spent. This figure includes additional capital improvements associated with the New Source Review Consent Decree and the Utility Mercury and Air Toxics Standards Rule. NIPSCO believes that the capital costs will likely be recoverable from ratepayers.

EPA Cross-State Air Pollution Rule / Clean Air Interstate Rule (CAIR) / Transport Rule: On July 6, 2011, the EPA announced its replacement for the 2005 CAIR to reduce the interstate transport of fine particulate matter and ozone. The CSAPR reduces overall emissions of SO₂ and NO_x by setting state-wide caps on power plant emissions. The CSAPR limits emissions, including NIPSCO's, and restricted emission allowance trading programs were scheduled to begin in 2012. In a decision issued on August 21, 2012 the D.C. Circuit Court vacated the CSAPR leaving the CAIR trading program provisions and requirements in place. The EPA subsequently petitioned for a writ of certiorari, and the United States Supreme Court granted this writ. Oral arguments were held on December 10, 2013, and a decision is expected in 2014. These developments do not significantly impact NIPSCO's current emissions control plans. NIPSCO utilizes the inventory model in accounting for emission allowances issued under the CAIR program whereby these allowances were recognized at zero cost upon receipt from the EPA. NIPSCO believes its current multi-pollutant compliance plan and New Source Review Consent Decree capital investments will allow NIPSCO to meet the emission requirements of CAIR, while a replacement for CSAPR is developed to address the court's decision.

Utility Mercury and Air Toxics Standards Rule: On December 16, 2011, the EPA finalized the MATS rule establishing new emissions limits for mercury and other air toxics. Compliance for NIPSCO’s affected units is required by April 2016. NIPSCO is implementing an IURC-approved plan for environmental controls to comply with MATS.

New Source Review:   On September 29, 2004, the EPA issued an NOV to NIPSCO for alleged violations of the CAA and the Indiana SIP. The NOV alleged that modifications were made to certain boiler units at three of NIPSCO's generating stations between the years 1985 and 1995 without obtaining appropriate air permits for the modifications. NIPSCO, the EPA, the Department of Justice, and IDEM have settled the matter through a consent decree, entered on July 22, 2011.

Water

The Phase II Rule of the Clean Water Act Section 316(b), which requires all large existing steam electric generating stations to meet certain performance standards to reduce the effects on aquatic organisms at their cooling water intake structures, became effective on September 7, 2004. Under this rule, stations will either have to demonstrate that the performance of their existing fish protection systems meet the new standards or develop new systems, such as a closed-cycle cooling tower. Various court challenges and EPA responses ensued. A final rule is expected to be issued in May 2014. NIPSCO will continue to monitor this matter but cannot estimate the cost of compliance at this time.

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ITEM 1. FINANCIAL STATEMENTS (continued)

NiSource Inc.

Notes to Condensed Consolidated Financial Statements (unaudited) (continued)

On June 7, 2013, the EPA published a proposed rule to amend the effluent limitations guidelines and standards for the Steam Electric Power Generating category. These proposed regulations could impose new water treatment requirements on NIPSCO’s electric generating facilities. NIPSCO will continue to monitor developments in this matter and cannot estimate the cost of compliance at this time.

Waste

On June 21, 2010, the EPA published a proposed rule for regulation of CCRs. The proposal outlines multiple regulatory approaches that the EPA is considering. These proposed regulations could negatively affect NIPSCO’s ongoing byproduct reuse programs and would impose additional requirements on its management of coal combustion residuals. NIPSCO will continue to monitor developments in this matter and cannot estimate the cost of compliance at this time.

D.     Other Matters. On November 23, 2012, while Columbia of Massachusetts was investigating the source of an odor of gas at a service location in Springfield, Massachusetts, a gas service line was pierced and an explosion occurred. While this explosion impacted multiple buildings and resulted in several injuries, no life threatening injuries or fatalities have been reported. Columbia of Massachusetts is fully cooperating with both the Massachusetts DPU and the Occupational Safety & Health Administration in their investigations of this incident. Columbia of Massachusetts believes any costs associated with damages, injuries, and other losses related to this incident are substantially covered by insurance. Any amounts not covered by insurance are not expected to have a material impact on NiSource's consolidated financial statements. In accordance with GAAP, NiSource recorded any accruals and the related insurance recoveries resulting from this incident on a gross basis within the Condensed Consolidated Balance Sheets (unaudited).

18.    Accumulated Other Comprehensive Loss

The following tables display the components of Accumulated Other Comprehensive Loss for the three months ended March 31, 2014 and 2013:

Three Months Ended March 31, 2014 (in millions)	Gains and Losses on Securities(1)			Gains and Losses on Cash Flow Hedges(1)			Pension and OPEB Items(1)			Accumulated Other Comprehensive Loss(1)
Balance as of January 1, 2014	$	(0.3	)	$	(25.8	)	$	(17.5	)	$	(43.6	)
Other comprehensive income before reclassifications	0.5			0.1			—			0.6
Amounts reclassified from accumulated other comprehensive income	(0.2		)	0.5			0.2			0.5
Net current-period other comprehensive income	0.3			0.6			0.2			1.1
Balance as of March 31, 2014	$	—		$	(25.2	)	$	(17.3	)	$	(42.5	)

Three Months Ended March 31, 2013 (in millions)	Gains and Losses on Securities(1)			Gains and Losses on Cash Flow Hedges(1)			Pension and OPEB Items(1)			Accumulated Other Comprehensive Loss(1)
Balance as of January 1, 2013	$	2.6		$	(28.6	)	$	(39.5	)	$	(65.5	)
Other comprehensive income before reclassifications	(0.1		)	0.1			1.3			1.3
Amounts reclassified from accumulated other comprehensive income	(0.3		)	0.8			1.4			1.9
Net current-period other comprehensive income	(0.4		)	0.9			2.7			3.2
Balance as of March 31, 2013	$	2.2		$	(27.7	)	$	(36.8	)	$	(62.3	)

⁽¹⁾All amounts are net of tax. Amounts in parentheses indicate debits.

Equity Investment

As Millennium is an equity method investment, NiSource is required to recognize a proportional share of Millennium’s OCI. The remaining unrecognized loss at March 31, 2014 of $17.4 million, net of tax, related to terminated interest rate swaps is being amortized over the period ending June 2025 into earnings using the effective interest method through interest expense as interest payments are made by Millennium. The unrecognized loss of $17.4 million and $17.7 million at March 31, 2014 and December 31, 2013, respectively, is included in gains and losses on cash flow hedges above.

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ITEM 1. FINANCIAL STATEMENTS (continued)

NiSource Inc.

Notes to Condensed Consolidated Financial Statements (unaudited) (continued)

19.    Business Segment Information

Operating segments are components of an enterprise for which separate financial information is available and evaluated regularly by the chief operating decision maker in deciding how to allocate resources and assess performance. NiSource's Chief Executive Officer is the chief operating decision maker.

At March 31, 2014, NiSource’s operations are divided into three primary business segments. The Gas Distribution Operations segment provides natural gas service and transportation for residential, commercial and industrial customers in Ohio, Pennsylvania, Virginia, Kentucky, Maryland, Indiana and Massachusetts. The Columbia Pipeline Group Operations segment offers gas transportation and storage services for LDCs, marketers and industrial and commercial customers located in northeastern, mid-Atlantic, midwestern and southern states along with unregulated businesses that include midstream services and development of mineral rights positions. The Electric Operations segment provides electric service in 20 counties in the northern part of Indiana.

The following table provides information about business segments. NiSource uses operating income as its primary measurement for each of the reported segments and makes decisions on finance, dividends and taxes at the corporate level on a consolidated basis. Segment revenues include intersegment sales to affiliated subsidiaries, which are eliminated in consolidation. Affiliated sales are recognized on the basis of prevailing market, regulated prices or at levels provided for under contractual agreements. Operating income is derived from revenues and expenses directly associated with each segment.

	Three Months Ended March 31,
(in millions)	2014			2013
REVENUES
Gas Distribution Operations
Unaffiliated	$	1,565.4		$	1,144.9
Intersegment	0.2			0.2
Total	1,565.6			1,145.1
Columbia Pipeline Group Operations
Unaffiliated	303.2			258.4
Intersegment	42.4			43.0
Total	345.6			301.4
Electric Operations
Unaffiliated	450.2			377.4
Intersegment	0.2			0.2
Total	450.4			377.6
Corporate and Other
Unaffiliated	1.7			1.5
Intersegment	126.8			121.7
Total	128.5			123.2
Eliminations	(169.6		)	(165.1		)
Consolidated Gross Revenues	$	2,320.5		$	1,782.2
Operating Income (Loss)
Gas Distribution Operations	$	301.8		$	234.1
Columbia Pipeline Group Operations	158.9			133.5
Electric Operations	78.9			65.2
Corporate and Other	(5.9		)	(3.9		)
Consolidated Operating Income	$	533.7		$	428.9

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ITEM 1. FINANCIAL STATEMENTS (continued)

NiSource Inc.

Notes to Condensed Consolidated Financial Statements (unaudited) (continued)

20.    Supplemental Cash Flow Information

The following table provides additional information regarding NiSource’s Condensed Statements of Consolidated Cash Flows (unaudited) for the three months ended March 31, 2014 and 2013:

	Three Months Ended March 31,
(in millions)	2014		2013
Supplemental Disclosures of Cash Flow Information
Non-cash transactions:
Capital expenditures included in current liabilities	$	131.4	$	114.3
Assets acquired under a capital lease	51.6		2.1
Schedule of interest and income taxes paid:
Cash paid for interest, net of interest capitalized amounts	$	167.7	$	161.8
Cash paid for income taxes	6.8		2.9

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ITEM 2. MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITIONS AND RESULTS OF OPERATIONS

NiSource Inc.

Note regarding forward-looking statements

The Management’s Discussion and Analysis, including statements regarding market risk sensitive instruments, contains “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. Investors and prospective investors should understand that many factors govern whether any forward-looking statement contained herein will be or can be realized. Any one of those factors could cause actual results to differ materially from those projected. These forward-looking statements include, but are not limited to, statements concerning NiSource’s plans, objectives, expected performance, expenditures and recovery of expenditures through rates, stated on either a consolidated or segment basis, and any and all underlying assumptions and other statements that are other than statements of historical fact. From time to time, NiSource may publish or otherwise make available forward-looking statements of this nature. All such subsequent forward-looking statements, whether written or oral and whether made by or on behalf of NiSource, are also expressly qualified by these cautionary statements. All forward-looking statements are based on assumptions that management believes to be reasonable; however, there can be no assurance that actual results will not differ materially.

Realization of NiSource’s objectives and expected performance is subject to a wide range of risks and can be adversely affected by, among other things, 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, counterparty credit risk, and the matters set forth in the “Risk Factors” section of NiSource’s 2013 Form 10-K, many of which are beyond the control of NiSource. In addition, the relative contributions to profitability by each segment, and the assumptions underlying the forward-looking statements relating thereto, may change over time. NiSource expressly disclaims a duty to update any of the forward-looking statements contained in this report.

The following Management’s Discussion and Analysis of Financial Conditions and Results of Operations should be read in conjunction with NiSource’s Annual Report on Form 10-K for the fiscal year ended December 31, 2013.

CONSOLIDATED REVIEW

Executive Summary

NiSource (the “Company”) is an energy holding company under the Public Utility Holding Company Act of 2005 whose subsidiaries are engaged in the transmission, storage and distribution of natural gas in the high-demand energy corridor stretching from the Gulf Coast through the Midwest to New England and the generation, transmission and distribution of electricity in Indiana. NiSource generates virtually 100% of its operating income through these rate-regulated businesses. A significant portion of NiSource’s operations is subject to seasonal fluctuations in sales. During the heating season, which is primarily from November through March, net revenues from gas sales are more significant, and during the cooling season, which is primarily from June through September, net revenues from electric sales and transportation services are more significant, than in other months.

For the three months ended March 31, 2014, NiSource reported income from continuing operations of $266.4 million, or $0.85 per basic share, compared to $216.0 million, or $0.69 per basic share reported for the same period in 2013.

The increase in income from continuing operations was due primarily to the following items:

• Regulatory and service programs at Gas Distributions Operations increased net revenues by $40.1 million primarily due to the impacts of the rate settlement in 2013 at Columbia of Pennsylvania and the implementation of rates under Columbia of Ohio's approved infrastructure replacement program. Refer to Note 8, “Regulatory Matters,” to the Consolidated Financial Statements included in NiSource’s Annual Report on Form 10-K for the fiscal year ended December 31, 2013 for more information.

• Colder weather in 2014 resulted in an increase in income from continuing operations of $25.4 million compared to the prior year. Weather statistics are provided in the Gas Distribution Operations’ segment discussion.

• The recognition of previously deferred gains of $17.5 million from the conveyances of mineral interests at Columbia Pipeline Group Operations.

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NiSource Inc.

These increases to income from continuing operations were partially offset by the following:

• Employee and administrative expense increased by $15.5 million due primarily to the timing of outages and maintenance, greater labor expense due to a growing workforce and reduced payroll capitalization, and IT support and enhancement projects.

These factors and other impacts to the financial results are discussed in more detail within the following discussions of “Results of Operations” and “Results and Discussion of Segment Operations.”

Platform for Growth

NiSource’s business plan will continue to center on commercial and regulatory initiatives; commercial growth and expansion of the gas transmission and storage business; financial management of the balance sheet; and cost and process excellence.

Commercial and Regulatory Initiatives

NiSource is moving forward on regulatory initiatives across several distribution company markets. Whether through full rate case filings or other approaches, NiSource’s goal is to develop strategies that benefit all stakeholders as it addresses changing customer conservation patterns, develops more contemporary pricing structures, and embarks on long-term investment programs to enhance its infrastructure.

NIPSCO continued to focus on customer service, reliability and long-term growth and modernization initiatives during the first quarter, while executing on significant environmental investments.

• Two remaining FGD projects at NIPSCO’s coal-fired electric generating facilities remain on schedule and on budget. The FGD investments are part of approximately $860 million in environmental investments, including water quality and emission-control projects, recently completed and planned at NIPSCO’s electric generating facilities. One project is expected to be completed by the end of 2014 and the other by the end of 2015.

• NIPSCO also has initiated the first year of investments under the company’s electric system modernization program, referred to as TDSIC, approved in February 2014 by the IURC. The $1.1 billion, seven-year program, provides for the replacement and upgrade of underground circuits, transformers and poles, helping increase system reliability and deliver economic development benefits to the region. NIPSCO also has filed a complementary seven-year, $710 million natural gas modernization program, with a decision from the IURC expected by the second quarter of 2014.

• Progress also continued on two major NIPSCO electric transmission projects designed to enhance system flexibility and reliability. The Reynolds-Topeka project, a 100-mile, 345-kV line, remains on schedule with right-of-way acquisition in process. The Greentown-Reynolds project, a 66-mile, 765-kV line, is a joint project with Pioneer Transmission. Public outreach on the Greentown-Reynolds line continues, with the anticipated route selection, and subsequent right-of-way acquisition, beginning later this year. The projects involve a NIPSCO investment of approximately $500 million and are anticipated to be in service by the end of 2018.

NiSource's Gas Distribution companies continue to deliver strong results from their strategy of aligning long-term infrastructure replacement and enhancement programs with a variety of complementary customer programs and regulatory initiatives.

• On April 23, 2014, Columbia of Ohioreceived approval of its annual IRP and DSM rider request from the PUCO. The program supports the company’s accelerated pipeline replacement program that began approximately six years ago. New rates are effective April 30, 2014.

• On February 28, 2014, the Massachusetts DPU issued an order on the Columbia of Massachusetts base rate case. The order provides for an annual revenue increase of approximately $19.3 million.

• On March 21, 2014, Columbia of Pennsylvania filed a rate case with the Pennsylvania PUC to support continuation of Columbia of Pennsylvania’s ongoing infrastructure modernization program. If approved, the case would increase annual revenues by approximately $54.1 million. A decision is expected in the fourth quarter of 2014.

Refer to Note 7, “Regulatory Matters,” in the Notes to Condensed Consolidated Financial Statements (unaudited) for a complete discussion of regulatory and commercial matters.

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ITEM 2.MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITIONS AND RESULTS OF OPERATIONS (continued)

NiSource Inc.

Modernization, Commercial Growth and Expansion of the Columbia Pipeline Group Operations

Columbia Pipeline Group Operations continues to make progress on its long-term infrastructure modernization program, as well as a series of midstream and core growth initiatives tied to NiSource's asset position in the Utica and Marcellus Shale production regions.

• Columbia Transmission is on track with the second year of its long-term system modernization program. Under the program, Columbia Transmission will invest approximately $300 million annually in improvements to system reliability, safety and flexibility. Columbia Transmission and its customers have agreed to the initial five years of the comprehensive modernization program, with an opportunity to mutually extend the agreement. The overall program is expected to last 10 years or more and involves an aggregate investment in excess of $4 billion.

• NiSource Midstream will construct a field gathering system in Pennsylvania that will gather well pad production of primarily dry gas from a third party producer. Pipeline laterals will be built to connect well pads as drilling is developed. The $120 million investment will include approximately 25 miles miles of gathering pipelines of varying diameter, a compressor station and dehydration unit. The gas gathering agreement has an initial 15-year term with the option to extend. Construction is expected to begin in late 2014, with an in service date during the fourth quarter of 2015.

• Millennium completed a new approximately $40 million compressor facility in Delaware County, New York, which went into service in March 2014. NiSource owns a 47.5% interest in Millennium.

• Columbia Pipeline Group Operations also remains on track with the execution of significant new supply-driven and market-driven growth projects, including the previously announced Warren County, West Side Expansion, Giles County and Line 1570 projects. These projects, which will provide total additional pipeline capacity of approximately 900 MMcf per day, are scheduled to be in service by the end of 2014. The approximately $275 million East Side project remains on budget and on schedule for completion in the third quarter of 2015.

Financial Management of the Balance Sheet

On January 31, 2014, Moody's Investors Service upgraded the senior unsecured rating for NiSource to Baa2 from Baa3 and NiSource’s commercial paper rating to P-2 from P-3. Additionally, the rating for NIPSCO was upgraded to Baa1 from Baa2.

Ethics and Controls

NiSource has had a long-term commitment to providing accurate and complete financial reporting as well as high standards for ethical behavior by its employees. NiSource’s senior management takes an active role in the development of this Form 10-Q and the monitoring of the company’s internal control structure and performance. In addition, NiSource will continue its mandatory ethics training program for all employees.

Refer to “Controls and Procedures” included in Item 4.

Results of Operations

Quarter Ended March 31, 2014

Net Income

NiSource reported net income of $266.2 million, or $0.85 per basic share, for the three months ended March 31, 2014, compared to net income of $260.5 million, or $0.84 per basic share, for the first quarter of 2013. Income from continuing operations was $266.4 million, or $0.85 per basic share, for the three months ended March 31, 2014, compared to income from continuing operations of $216.0 million, or $0.69 per basic share, for the first quarter of 2013. Operating income was $533.7 million, an increase of $104.8 million from the same period in 2013. All per share amounts are basic earnings per share. Basic average shares of common stock outstanding at March 31, 2014 were 314.2 million compared to 311.1 million at March 31, 2013.

Comparability of line item operating results between quarterly periods is impacted by regulatory and tax trackers that allow for the recovery in rates of certain costs such as bad debt expenses. Therefore, increases in these tracked operating expenses are offset by increases in net revenues and have essentially no impact on income from continuing operations.

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ITEM 2.MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITIONS AND RESULTS OF OPERATIONS (continued)

NiSource Inc.

Net Revenues

Total consolidated net revenues (gross revenues less cost of sales) for the quarter ended March 31, 2014, were $1,259.2 million, a $153.0 millionincrease from the same period last year. This increase in net revenues was primarily due to increased Gas Distribution Operations' net revenues of $91.3 million, higher Columbia Pipeline Group Operations' net revenues of $44.2 million and increased Electric Operations' net revenues of $17.3 million.

• Columbia Pipeline Group Operations’ net revenues increased primarily due to higher regulatory trackers, which are offset in expense, of $24.5 million, increased demand and commodity revenue of $9.9 million as a result of growth projects placed in service and an increase in mineral rights royalty revenue of $7.1 million.

• Gas Distribution Operations’ net revenues increased primarily due to an increase of $40.1 million for regulatory and service programs, including the impacts of the rate settlement in 2013 at Columbia of Pennsylvania and the implementation of rates under Columbia of Ohio's approved infrastructure replacement program, the effects of colder weather of $21.0 million, increased regulatory and tax trackers, which are offset in expense, of $16.3 million, higher residential and commercial usage of $5.9 million, an increase in off-system sales of $3.4 million, higher revenue of $3.0 million due to an increase in residential and commercial customers and an increase in large customer revenue of $2.2 million. These increases were partially offset by a decrease of $4.8 million resulting from NIPSCO’s GCIM.

• Electric Operations’ net revenues increased primarily due to an increase in off-system sales of $9.5 million, higher industrial usage of $8.6 million, an increase in the return on the environmental capital investment recovery of $8.1 million due to an increased plant balance eligible for recovery, and the effects of colder weather of $4.4 million. These increases were partially offset by a decrease in transmission upgrade revenue of $6.3 million, decreased trackers, which are offset in expense, of $5.1 million and lower residential and commercial usage of $2.2 million.

Operating Expenses

Operating expenses for the first quarter of 2014 were $735.3 million, an increase of $50.9 million from the 2013 period. This increase was primarily due to higher operation and maintenance expenses of $46.9 million, increased other taxes of $14.4 million and higher depreciation and amortization of $5.1 million. These increases were partially offset by an increase in the gain on sale of assets of $15.5 million. The increase in operation and maintenance expenses was primarily due to increased regulatory trackers, which are offset in net revenue, of $33.2 million and higher employee and administrative costs of $15.5 million. These increases were partially offset by a decrease in outside service costs of $5.1 million. The increase in other taxes is primarily due to higher property and other taxes of $8.4 million and increased tax trackers, which are offset in net revenue, of $6.0 million. The increase in depreciation and amortization is primarily due to higher capital expenditures placed in service. The increase in gain on sale of assets primarily relates to recognized gains of $17.5 million resulting from conveyances of mineral interests at Columbia Pipeline Group Operations.

Equity Earnings in Unconsolidated Affiliates

Equity Earnings in Unconsolidated Affiliates were $9.8 million during the first quarter of 2014 compared to $7.1 million for the first quarter of 2013. Equity Earnings in Unconsolidated Affiliates includes investments in Millennium, Hardy Storage and Pennant, which are integral to the Columbia Pipeline Group Operations’ business. Equity earnings increased primarily from increased earnings at Millennium.

Other Income (Deductions)

Other Income (Deductions) reduced income by $104.6 million in the first quarter of 2014 compared to a reduction in income of $94.5 million in the prior year. The increase in deductions is primarily due to an increase in interest expense of $10.5 million resulting from the issuance of $500.0 million of long-term debt in October 2013 and the issuance of $750.0 million of long-term debt in April 2013, partially offset by the maturity of $420.3 million of long-term debt in March 2013.

Income Taxes

Income tax expense for the quarter ended March 31, 2014 was $162.7 million compared to $118.4 million in the prior year. NiSource’s interim effective tax rates reflect the estimated annual effective tax rates for 2014 and 2013, adjusted for tax expense associated with certain discrete items. The effective tax rates for the quarters ended March 31, 2014 and 2013 were 37.9% and 35.4%, respectively. These effective tax rates differ from the Federal tax rate of 35% primarily due to the effects of tax credits, state income taxes, utility rate-making, and other permanent book-to-tax differences. The 2.5% increase from 2013 to 2014 is primarily due to the impact of the Indiana rate change. Refer to Note 12, "Income Taxes," in the Notes to Consolidated Financial Statements (unaudited) for further discussion of income taxes.

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ITEM 2.MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITIONS AND RESULTS OF OPERATIONS (continued)

NiSource Inc.

Discontinued Operations

There was a net loss of $0.2 million in the first quarter of 2014 from discontinued operations compared to net income of $8.1 million in the first quarter of 2013. The net income in 2013 relates primarily to a settlement at NiSource's former exploration and production subsidiary, CER. A gain on the disposition of discontinued operations of $36.4 million was recorded in the first quarter of 2013 as a result of a gain on the sale of the service plan and leasing business lines of NiSource's Retail Services business.

Liquidity and Capital Resources

A significant portion of NiSource’s operations, most notably in the gas distribution, gas transportation and electric businesses, are subject to seasonal fluctuations in cash flow. During the heating season, which is primarily from November through March, cash receipts from gas sales and transportation services typically exceed cash requirements. During the summer months, cash on hand, together with the seasonal increase in cash flows from the electric business during the summer cooling season and external short-term and long-term financing, is used to purchase gas to place in storage for heating season deliveries and perform necessary maintenance of facilities. NiSource believes that through income generated from operating activities, amounts available under its short-term revolver, commercial paper program and long-term debt agreements and NiSource’s ability to access the capital markets, there is adequate capital available to fund its operating activities and capital expenditures in 2014.

Operating Activities

Net cash from operating activities for the three months endedMarch 31, 2014 was $394.0 million, a decrease of $55.1 million compared to the three months endedMarch 31, 2013. The decrease in net cash from operating activities was primarily attributable to an income tax refund received in 2013. No income tax refunds were received in 2014.

Pension and Other Postretirement Plan Funding.    NiSource expects to make contributions of approximately $38.3 million to its pension plans and approximately $39.1 million to its other postretirement benefit plans in 2014, which could change depending on market conditions. For the three months endedMarch 31, 2014, NiSource has contributed $0.7 million to its pension plans and $9.2 million to its other postretirement benefit plans.

Investing Activities

NiSource’s capital expenditures for the three months endedMarch 31, 2014 were $386.3 million, compared to $369.3 million for the comparable period in 2013. This increased spending is mainly due to continued spending on infrastructure replacement programs in the Gas Distributions Operations segment, higher spending in the Columbia Pipeline Group Operations segment for various growth projects primarily in the Marcellus and Utica Shale areas and for expenditures under its modernization program and increased expenditures in the Electric Operations segment due to TDSIC and other tracker program spend. NiSource projects 2014 capital expenditures to be approximately $2.2 billion.

Restricted cash was $10.9 million and $8.0 million as of March 31, 2014 and December 31, 2013, respectively.

Contributions to equity investees increased$13.9 million due to higher contributions made by NiSource Midstream to Pennant. Refer to the Columbia Pipeline Group Operations segment discussion in the Management's Discussion and Analysis of Financial Conditions and Results of Operations for information on these contributions.

Financing Activities

Credit Facilities.    On September 30, 2013, NiSource Finance amended its existing revolving credit facility with a syndicate of banks led by Barclays Capital to expand its borrowing capacity to $2.0 billion and extend the termination date to September 28, 2018. The purpose of the facility is to fund ongoing working capital requirements including the provision of liquidity support for NiSource’s $1.5 billion commercial paper program, provide for issuance of letters of credit, and also for general corporate purposes.

NiSource Finance's commercial paper program has a program limit of up to $1.5 billion with a dealer group comprised of Barclays, Citigroup, Credit Suisse, RBS and Wells Fargo. Commercial paper issuances are supported by available capacity under NiSource’s $2.0 billion unsecured revolving credit facility.

NiSource Finance had no borrowings outstanding under its revolving credit facility at March 31, 2014 and December 31, 2013. In addition, NiSource Finance had $297.5 million in commercial paper outstanding at March 31, 2014, at a weighted average interest rate of 0.55% and $433.6 million in commercial paper outstanding at December 31, 2013, at a weighted average interest rate of 0.70%.

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As of March 31, 2014 and December 31, 2013, NiSource had $515.0 million and $265.1 million, respectively, of short-term borrowings recorded on the Condensed Consolidated Balance Sheets (unaudited) and cash from financing activities in the same amount relating to its accounts receivable securitization facilities. See Note 10, “Transfers of Financial Assets,” to the Condensed Consolidated Financial Statements (unaudited).

As of March 31, 2014, NiSource had $30.5 million of stand-by letters of credit outstanding of which $14.3 million were under the revolving credit facility. At December 31, 2013, NiSource had $31.6 million of stand-by letters of credit outstanding of which $14.3 million were under the revolving credit facility.

As of March 31, 2014, an aggregate of $1,688.2 million of credit was available under the credit facility.

Debt Covenants. NiSource is subject to a financial covenant under its revolving credit facility and its three-year term loan issued April 5, 2012, which requires NiSource to maintain a debt to capitalization ratio that does not exceed 70%. A similar covenant in a 2005 private placement note purchase agreement requires NiSource to maintain a debt to capitalization ratio that does not exceed 75%. As of March 31, 2014, the ratio was 59.9%.

NiSource is also subject to certain other non-financial covenants under the revolving credit facility. Such covenants include a limitation on the creation or existence of new liens on NiSource’s assets, generally exempting liens on utility assets, purchase money security interests, preexisting security interests and an additional subset of assets equal to $150 million. An asset sale covenant generally restricts the sale, lease and/or transfer of NiSource’s assets to no more than 10% of its consolidated total assets and dispositions for a price not materially less than the fair market value of the assets disposed of that do not impair the ability of NiSource and NiSource Finance to perform obligations under the revolving credit facility, and that, together with all other such dispositions, would not have a material adverse effect. The revolving credit facility also includes a cross-default provision, which triggers an event of default under the credit facility in the event of an uncured payment default relating to any indebtedness of NiSource or any of its subsidiaries in a principal amount of $50 million or more.

NiSource’s indentures generally do not contain any financial maintenance covenants. However, NiSource’s indentures are generally subject to cross-default provisions ranging from uncured payment defaults of $5 million to $50 million, and limitations on the incurrence of liens on NiSource’s assets, generally exempting liens on utility assets, purchase money security interests, preexisting security interests and an additional subset of assets capped at 10% of NiSource’s consolidated net tangible assets.

Sale of Trade Accounts Receivables.    Refer to Note 10, “Transfers of Financial Assets,” in the Notes to Condensed Consolidated Financial Statements (unaudited) for information on the sale of accounts receivable.

All accounts receivable sold to the commercial paper conduits are valued at face value, which approximates fair value due to their short-term nature. The amount of the undivided percentage ownership interest in the accounts receivables sold is determined, in part, by required loss reserves under the agreements.

Credit Ratings.    On March 14, 2014, Standard & Poor's affirmed the senior unsecured ratings for NiSource and its subsidiaries at BBB-. Standard & Poor's outlook for NiSource and all of its subsidiaries is stable. On January 31, 2014, Moody's Investors Service upgraded the senior unsecured rating for NiSource to Baa2 from Baa3 and NiSource’s commercial paper rating to P-2 from P-3. Additionally, the rating for NIPSCO was upgraded to Baa1 from Baa2 and the rating for Columbia of Massachusetts was affirmed at Baa2. Moody's outlook for NiSource and all of its subsidiaries is stable. On December 9, 2013, Fitch affirmed the senior unsecured ratings for NiSource at BBB-, and the existing ratings of all other subsidiaries. Fitch's outlook for NiSource and all of its subsidiaries is stable. Although all ratings continue to be investment grade, a downgrade by Standard & Poor's or Fitch would result in a rating that is below investment grade.

Certain NiSource affiliates have agreements that contain “ratings triggers” that require increased collateral if the credit ratings of NiSource or certain of its subsidiaries are rated below BBB- by Standard & Poor’s or Baa3 by Moody’s. These agreements are primarily for insurance purposes and for the physical purchase or sale of power. The collateral requirement that would be required in the event of a downgrade below the ratings trigger levels would amount to approximately $37.0 million. In addition to agreements with ratings triggers, there are other agreements that contain “adequate assurance” or “material adverse change” provisions that could necessitate additional credit support such as letters of credit and cash collateral to transact business.

Contractual Obligations.    There were no material changes recorded during the three months endedMarch 31, 2014 to NiSource’s contractual obligations as of December 31, 2013.

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Market Risk Disclosures

Risk is an inherent part of NiSource’s energy businesses. The extent to which NiSource properly and effectively identifies, assesses, monitors and manages each of the various types of risk involved in its businesses is critical to its profitability. NiSource seeks to identify, assess, monitor and manage, in accordance with defined policies and procedures, the following principal market risks that are involved in NiSource’s energy businesses: commodity price risk, interest rate risk and credit risk. Risk management at NiSource is a multi-faceted process with oversight by the Risk Management Committee that requires constant communication, judgment and knowledge of specialized products and markets. NiSource’s senior management takes an active role in the risk management process and has developed policies and procedures that require specific administrative and business functions to assist in the identification, assessment and control of various risks. These include but are not limited to market, operational, financial, compliance and strategic risk types. In recognition of the increasingly varied and complex nature of the energy business, NiSource’s risk management process, policies and procedures continue to evolve and are subject to ongoing review and modification.

Commodity Price Risk

NiSource is exposed to commodity price risk as a result of its subsidiaries’ operations involving natural gas and power. To manage this market risk, NiSource’s subsidiaries use derivatives, including commodity futures contracts, swaps and options. NiSource is not involved in speculative energy trading activity.

Commodity price risk resulting from derivative activities at NiSource’s rate-regulated subsidiaries is limited, since regulations allow recovery of prudently incurred purchased power, fuel and gas costs through the rate-making process, including gains or losses on these derivative instruments. If states should explore additional regulatory reform, these subsidiaries may begin providing services without the benefit of the traditional rate-making process and may be more exposed to commodity price risk. Some of NiSource’s rate-regulated utility subsidiaries offer commodity price risk products to its customers for which derivatives are used to hedge forecasted customer usage under such products. These subsidiaries do not have regulatory recovery orders for these products and are subject to gains and losses recognized in earnings due to hedge ineffectiveness.

Interest Rate Risk

NiSource is exposed to interest rate risk as a result of changes in interest rates on borrowings under its revolving credit agreement, term loan, commercial paper program and accounts receivable programs, which have interest rates that are indexed to short-term market interest rates. NiSource is also exposed to interest rate risk due to changes in interest rates on fixed-to-variable interest rate swaps that hedge the fair value of long-term debt. Based upon average borrowings and debt obligations subject to fluctuations in short-term market interest rates, an increase (or decrease) in short-term interest rates of 100 basis points (1%) would have increased (or decreased) interest expense by $3.7 million for the three months endedMarch 31, 2014 and $4.0 million for the three months endedMarch 31, 2013.

Credit Risk

Due to the nature of the industry, credit risk is embedded in many of NiSource’s business activities. NiSource’s extension of credit is governed by a Corporate Credit Risk Policy. In addition, Risk Management Committee guidelines are in place which document management approval levels for credit limits, evaluation of creditworthiness, and credit risk mitigation efforts. Exposures to credit risks are monitored by the Corporate Credit Risk function which is independent of commercial operations. Credit risk arises due to the possibility that a customer, supplier or counterparty will not be able or willing to fulfill its obligations on a transaction on or before the settlement date. For derivative related contracts, credit risk arises when counterparties are obligated to deliver or purchase defined commodity units of gas or power to NiSource at a future date per execution of contractual terms and conditions. Exposure to credit risk is measured in terms of both current obligations and the market value of forward positions net of any posted collateral such as cash, letters of credit and qualified guarantees of support.

NiSource closely monitors the financial status of its banking credit providers and interest rate swap counterparties. NiSource evaluates the financial status of its banking partners through the use of market-based metrics such as credit default swap pricing levels, and also through traditional credit ratings provided by major credit rating agencies.

Fair Value Measurement

NiSource measures certain financial assets and liabilities at fair value. The level of the fair value hierarchy disclosed is based on the lowest level of input that is significant to the fair value measurement. NiSource’s financial assets and liabilities include price risk assets and liabilities, available-for-sale securities and a deferred compensation plan obligation.

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Exchange-traded derivative contracts are generally based on unadjusted quoted prices in active markets and are classified within Level 1. These financial assets and liabilities are secured with cash on deposit with the exchange; therefore nonperformance risk has not been incorporated into these valuations. Certain non-exchange-traded derivatives are valued using broker or over-the-counter, on-line exchanges. In such cases, these non-exchange-traded derivatives are classified within Level 2. Non-exchange-based derivative instruments include swaps, forwards, and options. In certain instances, NiSource may utilize models to measure fair value. Valuation models utilize various inputs that include quoted prices for similar assets or liabilities in active markets, quoted prices for identical or similar assets or liabilities in markets that are not active, other observable inputs for the asset or liability, and market-corroborated inputs, i.e., inputs derived principally from or corroborated by observable market data by correlation or other means. Where observable inputs are available for substantially the full term of the asset or liability, the instrument is categorized in Level 2. Certain derivatives trade in less active markets with a lower availability of pricing information and models may be utilized in the valuation. When such inputs have a significant impact on the measurement of fair value, the instrument is categorized in Level 3. Credit risk is considered in the fair value calculation of derivative instruments that are not exchange-traded. Credit exposures are adjusted to reflect collateral agreements which reduce exposures.

Price risk management assets also include fixed-to-floating interest-rate swaps, which are designated as fair value hedges, as a means to achieve its targeted level of variable-rate debt as a percent of total debt. NiSource uses a calculation of future cash inflows and estimated future outflows related to the swap agreements, which are discounted and netted to determine the current fair value. Additional inputs to the present value calculation include the contract terms, as well as market parameters such as current and projected interest rates and volatility. As they are based on observable data and valuations of similar instruments, the interest-rate swaps are categorized in Level 2 in the fair value hierarchy. Credit risk is considered in the fair value calculation of the interest rate swap.

Refer to Note 9, “Fair Value” in the Notes to the Condensed Consolidated Financial Statements (unaudited) for additional information on NiSource’s fair value measurements.

Off Balance Sheet Arrangements

As a part of normal business, NiSource and certain subsidiaries enter into various agreements providing financial or performance assurance to third parties on behalf of certain subsidiaries. Such agreements include guarantees and stand-by letters of credit.

NiSource has purchase and sales agreement guarantees totaling $73.5 million, which guarantee performance of the seller’s covenants, agreements, obligations, liabilities, representations and warranties under the agreements. No amounts related to the purchase and sales agreement guarantees are reflected in the Condensed Consolidated Balance Sheets (unaudited). Management believes that the likelihood NiSource would be required to perform or otherwise incur any significant losses associated with any of the aforementioned guarantees is remote.

NiSource has other guarantees outstanding. Refer to Note 17-A, “Guarantees and Indemnities,” in the Notes to Condensed Consolidated Financial Statements (unaudited) for additional information about NiSource’s off balance sheet arrangements.

Other Information

Critical Accounting Policies

There were no significant changes to critical accounting policies for the period ended March 31, 2014.

Recently Issued Accounting Pronouncements

In April 2014, the FASB issued ASU 2014-08, Presentation of Financial Statements (Topic 205) and Property, Plant, and Equipment (Topic 360): Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity. ASU 2014-08 changes the criteria for reporting a discontinued operation. Under the new pronouncement, a disposal of a part of an organization that has a major effect on its operations and financial results is a discontinued operation. NiSource is required to adopt ASU 2014-08 prospectively for all disposals or components of its business classified as held for sale during fiscal periods beginning after December 15, 2014. NiSource is currently evaluating what impact, if any, adoption of ASU 2014-08 will have on its Condensed Consolidated Financial Statements (unaudited) and Notes to Condensed Consolidated Financial Statements (unaudited).

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NiSource Inc.

RESULTS AND DISCUSSION OF SEGMENT OPERATIONS

Presentation of Segment Information

NiSource’s operations are divided into three primary business segments: Gas Distribution Operations, Columbia Pipeline Group Operations and Electric Operations.

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Gas Distribution Operations

	Three Months Ended March 31,
(in millions)	2014			2013
Net Revenues
Sales revenues	$	1,565.6		$	1,145.1
Less: Cost of gas sold (excluding depreciation and amortization)	923.0			593.8
Net Revenues	642.6			551.3
Operating Expenses
Operation and maintenance	228.8			218.4
Depreciation and amortization	52.2			48.5
Other taxes	59.8			50.3
Total Operating Expenses	340.8			317.2
Operating Income	$	301.8		$	234.1
Revenues ($ in millions)
Residential	$	1,005.8		$	743.9
Commercial	366.3			270.3
Industrial	84.3			65.0
Off System	71.9			79.4
Other	37.3			(13.5		)
Total	$	1,565.6		$	1,145.1
Sales and Transportation (MMDth)
Residential	156.5			132.0
Commercial	90.1			75.3
Industrial	136.8			133.3
Off System	14.3			21.7
Other	0.2			0.2
Total	397.9			362.5
Heating Degree Days	3,437			2,919
Normal Heating Degree Days	2,892			2,892
% Colder than Normal	19		%	1		%
Customers
Residential	3,094,353			3,072,919
Commercial	283,000			281,933
Industrial	7,570			7,553
Other	20			23
Total	3,384,943			3,362,428

NiSource’s Gas Distribution Operations serve approximately 3.4 million customers in seven states: Ohio, Indiana, Pennsylvania, Massachusetts, Virginia, Kentucky and Maryland. The regulated subsidiaries offer both traditional bundled services as well as transportation only for customers that purchase gas from alternative suppliers. The operating results reflect the temperature-sensitive nature of customer demand with 74% of annual residential and commercial throughput affected by seasonality. As a result, segment operating income is higher in the first and fourth quarters reflecting the heating demand during the winter season.

Regulatory Matters

Refer to Note 7, “Regulatory Matters,” in the Notes to Condensed Consolidated Financial Statements (unaudited) for information on significant rate developments and cost recovery and trackers for the Gas Distribution Operations segment.

Customer Usage. Increased efficiency of natural gas appliances and improvements in home building codes and standards has contributed to a long-term trend of declining average use per customer. Usage for the three months ended March 31, 2014 increased

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Gas Distribution Operations

from the same period last year primarily due to colder weather compared to the prior year. While historically, rate design at the distribution level has been structured such that a large portion of cost recovery is based upon throughput, rather than in a fixed charge, operating costs are largely incurred on a fixed basis, and do not fluctuate due to changes in customer usage. As a result, the NiSource LDCs have pursued changes in rate design to more effectively match recoveries with costs incurred. Each of the states in which the NiSource LDCs operate has different requirements regarding the procedure for establishing changes to rate design. Columbia of Ohio restructured its rate design through a base rate proceeding and has adopted a “de-coupled” rate design which more closely links the recovery of fixed costs with fixed charges. Columbia of Massachusetts and Columbia of Virginia received regulatory approval of decoupling mechanisms which adjust revenues to an approved benchmark level through a volumetric adjustment factor. Columbia of Maryland has received regulatory approval to implement a residential class revenue normalization adjustment, a decoupling mechanism whereby monthly revenues that exceed or fall short of approved levels are reconciled in subsequent months. In a prior base rate proceeding, Columbia of Pennsylvania implemented a residential weather normalization adjustment charge. In a prior base rate proceeding, NIPSCO implemented a higher fixed customer charge for residential and small customer classes moving toward full straight fixed variable rate design.

Environmental Matters

Various environmental matters occasionally impact the Gas Distribution Operations segment. As of March 31, 2014, a reserve has been recorded to cover probable and estimable environmental response actions. Refer to Note 17-C, “Environmental Matters,” in the Notes to Condensed Consolidated Financial Statements (unaudited) for additional information regarding environmental matters for the Gas Distribution Operations segment.

Weather

In general, NiSource calculates the weather related revenue variance based on changing customer demand driven by weather variance from normal heating degree-days. Normal is evaluated using heating degree days across the NiSource distribution region. While the temperature base for measuring heating degree days (i.e. the estimated average daily temperature at which heating load begins) varies slightly across the region, the NiSource composite measurement is based on 65 degrees. NiSource composite heating degree days reported do not directly correlate to the weather related dollar impact on the results of Gas Distribution Operations. Heating degree days experienced during different times of the year or in different operating locations may have more or less impact on volume and dollars depending on when and where they occur. When the detailed results are combined for reporting, there may be weather related dollar impacts on operations when there is not an apparent or significant change in the aggregated NiSource composite heating degree-day comparison.

Weather in the Gas Distribution Operations’ territories for the first quarter of 2014 was 19% colder than normal and 18% colder than the first quarter in 2013.

Throughput

Total volumes sold and transported of 397.9 MMDth for the first quarter of 2014 increased by 35.4 MMDth from the same period last year. This 9.8% increase in volume was primarily attributable to colder weather.

Net Revenues

Net revenues for the first quarter of 2014 were $642.6 million, an increase of $91.3 million from the same period in 2013. The increase in net revenues is due primarily to an increase of $40.1 million for regulatory and service programs, including the impacts of the rate settlement in 2013 at Columbia of Pennsylvania and the implementation of rates under Columbia of Ohio's approved infrastructure replacement program, the effects of colder weather of $21.0 million, increased regulatory and tax trackers, which are offset in expense, of $16.3 million, higher residential and commercial usage of $5.9 million, an increase in off-system sales of $3.4 million, higher revenue of $3.0 million due to an increase in customer count and an increase in large customer revenue of $2.2 million. These increases were partially offset by a decrease of $4.8 million resulting from NIPSCO’s GCIM.

At NIPSCO, sales revenues and customer billings are adjusted for amounts related to under and over-recovered purchased gas costs from prior periods per regulatory order. These amounts are primarily reflected in the “Other” gross revenues statistic provided at the beginning of this segment discussion. The adjustment to Other gross revenues for the three months ended March 31, 2014 was a revenue increase of $31.5 million compared to a decrease of $24.7 million for the three months ended March 31, 2013.

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Gas Distribution Operations

Operating Income

For the first quarter of 2014, Gas Distribution Operations reported operating income of $301.8 million, an increase of $67.7 million from the comparable 2013 period. Operating income increased as a result of higher net revenues, as described above, partially offset by increased operating expenses. Operating expenses were $23.6 million higher than the comparable period reflecting increased regulatory and tax trackers, which are offset in net revenue, of $16.3 million, an increase of $3.7 million in depreciation due to higher capital expenditures, increased employee and administrative expenses of $3.6 million and higher other taxes of $3.5 million. These increases were partially offset by a decrease in outside service costs of $5.6 million.

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Columbia Pipeline Group Operations

	Three Months Ended March 31,
(in millions)	2014			2013
Net Revenues
Transportation revenues	$	222.3		$	210.9
Storage revenues	49.9			50.5
Other revenues	73.4			40.0
Total Sales Revenues	345.6			301.4
Less: Cost of sales (excluding depreciation and amortization)	0.1			0.1
Net Revenues	345.5			301.3
Operating Expenses
Operation and maintenance	165.7			132.6
Depreciation and amortization	29.7			25.7
Gain on sale of assets	(17.5		)	(0.2		)
Other taxes	18.5			16.8
Total Operating Expenses	196.4			174.9
Equity Earnings in Unconsolidated Affiliates	9.8			7.1
Operating Income	$	158.9		$	133.5
Throughput (MMDth)
Columbia Transmission	459.5			435.8
Columbia Gulf	184.9			190.2
Crossroads Pipeline	5.7			5.0
Intrasegment eliminations	(61.6		)	(93.9		)
Total	588.5			537.1

NiSource’s Columbia Pipeline Group Operations segment primarily consists of the operations of Columbia Transmission, Columbia Gulf, NiSource Midstream, NEVCO, Crossroads Pipeline, and the equity investments in Pennant, Millennium and Hardy Storage. In total, NiSource owns a pipeline network of approximately 15,000 miles extending from the Gulf of Mexico to New York and the eastern seaboard. The pipeline network serves customers in 16 northeastern, mid-Atlantic, midwestern and southern states, as well as the District of Columbia. In addition, the Columbia Pipeline Group Operations segment operates one of the nation’s largest underground natural gas storage systems.

Columbia Pipeline Group Operations’ most significant projects are as follows:

Warren County. The Columbia Pipeline Group Operations segment is spending approximately $37 million on an expansion project, which includes new pipeline and modifications to existing compression assets, with Virginia Power Services Energy Corporation, Inc., the energy manager for Virginia Electric and Power Company. This project will expand the Columbia Transmission system in order to provide up to nearly 250,000 Dth per day of transportation capacity under a long-term, firm contract. The project is expected to be ready for commercial operations by mid-2014.

West Side Expansion. The Columbia Pipeline Group Operations segment is investing approximately $200 million in new pipeline and compression to increase supply origination from the Smithfield and Waynesburg areas on the Columbia Transmission system and provide a backhaul transportation path to Gulf Coast markets on the Columbia Gulf system. This investment will increase capacity up to 444,000 Dth per day from the Smithfield and Waynesburg areas and up to 540,000 Dth per day from Leach to Rayne transporting Marcellus production under long-term, firm contracts. Limited interim service is being provided throughout 2014 with the project fully in service by the fourth quarter of 2014.

Giles County. The Columbia Pipeline Group Operations segment is spending approximately $25 million to construct nearly thirteen miles of pipeline to provide 45,000 Dth per day of firm service to a third party off of its Line KA system into Columbia of Virginia's system. Columbia of Virginia will expand pipeline facilities and an existing direct connection with the third party's plant in Giles County, Virginia. The project is planned to be in service by the fourth quarter of 2014.

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Columbia Pipeline Group Operations

Line 1570 Expansion. The Columbia Pipeline Group Operations segment is replacing 18.7 miles of 20-inch bare steel pipe with 24-inch pipe from Waynesburg, Pennsylvania to Redd Farm, Pennsylvania at an approximate cost of $20 million. The project also includes the installation of two compressors at Redd Farm and an uprate in horsepower at Waynesburg, increasing capacity by nearly 100,000 Dth per day. The project is expected to be in service by the end of 2014.

East Side Expansion. The Columbia Pipeline Group Operations segment plans to invest approximately $275 million in developing its East Side Expansion project, which will provide access for Marcellus supplies to the northeastern and mid-Atlantic markets. Backed by binding precedent agreements, the project will add up to 312,000 Dth per day of capacity, which is expected to be placed in service by the end of the third quarter of 2015.

Washington County Gathering. The Columbia Pipeline Group Operations segment will construct a field gathering system in Pennsylvania that will gather well pad production of primarily dry gas from a third party producer. Pipeline laterals will be built to connect well pads as drilling is developed. The $120 million investment will include approximately 25 miles miles of gathering pipelines of varying diameter, a compressor station and dehydration unit. The gas gathering agreement has an initial 15-year term with the option to extend. Construction is expected to begin in late 2014, with an in service date during the fourth quarter of 2015.

Cameron Access. The Columbia Pipeline Group Operations segment has entered into binding precedent agreements for the construction of new pipeline facilities along the Columbia Gulf system to connect with the Cameron LNG Terminal in southern Louisiana. The approximately $310 million project will transport supplies from numerous supply basins, including Marcellus, Utica, Haynesville, Fayetteville, Gulf Coast, East Texas, Granite Wash and Barnett, to the planned LNG export facility, which received Department of Energy approval late in 2013. The project will offer an initial capacity of up to 800,000 Dth per day and is expected to be placed into service by the end of 2017.

Equity Investments

Pennant. NiSource Midstream entered into a 50:50 joint venture in 2012 with affiliates of Hilcorp to construct new wet natural gas gathering pipeline infrastructure and NGL processing facilities to support natural gas production in the Utica Shale region of northeastern Ohio and western Pennsylvania. NiSource Midstream and Hilcorp jointly own Pennant with NiSource Midstream serving as the operator of Pennant and the facilities. NiSource accounts for the joint venture under the equity method of accounting.

Pennant is investing in the construction of 20-24 inch wet gas gathering pipeline facilities with a capacity of approximately 600 MMcf per day. In addition, Pennant is installing a gas processing facility in New Middletown, Ohio that will have an initial capacity of 200 MMcf per day and an NGL pipeline with an initial capacity of 45,000 barrels per day that can be expanded to 90,000 barrels per day. Consistent with the terms of the joint venture, NiSource Midstream will operate the gas processing facility, NGL pipeline and associated wet gas gathering system. The joint venture is designed and anticipated to serve other producers with significant acreage development in the area with an interest in obtaining capacity on the system. The construction of the facilities will allow Pennant to become a full-service solution for providers in the northern Utica shale region, offering access to wet gas gathering and processing as well as residue gas and NGL takeaway to attractive market destinations. NiSource Midstream's initial investment in this area, including the gathering pipeline, related laterals, NGL pipeline and the processing plant, will be approximately $185 million. A portion of the facilities were placed in service in the fourth quarter of 2013 and the remainder will be in service in the second and third quarters of 2014.

During the first quarter of 2014, NiSource Midstream made cash contributions to Pennant totaling $28.4 million. A cash contribution of $10.5 million was made during the same period last year.

In a separate agreement with Hilcorp, test wells were drilled in 2012 and continued in 2013 to support the development of the hydrocarbon potential on more than 100,000 combined acres in the Utica/Point Pleasant Shale formation. Production wells were drilled in 2013, with the full production program in development. NiSource is investing alongside Hilcorp in the development of the acreage, with NiSource owning both a working and overriding royalty interest. All of the Hilcorp/NiSource acreage is dedicated to Pennant.

Millennium. Millennium operates approximately 250 miles of pipeline under the jurisdictional authority of the FERC. The Millennium pipeline has the capability to transport natural gas to markets along its route, which lies between Corning, New York and Ramapo, New York, as well as to the New York City market through its pipeline interconnections. Columbia Transmission

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ITEM 2.MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITIONS AND RESULTS OF OPERATIONS (continued)

NiSource Inc.

Columbia Pipeline Group Operations

owns a 47.5% interest in Millennium and acts as operator for the pipeline in partnership with DTE Millennium Company and National Grid Millennium LLC, which each own an equal remaining share of the company.

During the first quarters of 2014 and 2013, Columbia Transmission made contributions to Millennium to fund its share of capital projects of $2.6 million and $6.7 million, respectively. For the same respective periods, Columbia Transmission received distributions of earnings of $7.1 million and $6.7 million.

Millennium began two projects in 2012 that will add nearly 30,000 hp of compression to its system. The first project went into service on June 1, 2013 and increased capacity at its interconnections with Algonquin Gas Transmission, with a total investment of approximately $50 million. The second project included a total investment of approximately $40 million that increased capacity with interconnections to other third-party facilities. The second project was placed into service on March 31, 2014. Columbia Transmission's share of the above investments is limited to its 47.5% interest in Millennium.

Hardy Storage. Hardy Storage is a 50:50 joint venture between subsidiaries of Columbia Transmission and Piedmont that manages an underground storage field in Hardy and Hampshire counties in West Virginia. Columbia Transmission serves as operator of the company, which is regulated by the FERC. Hardy Storage has a working storage capacity of 12 Bcf and the ability to deliver 176,000 Dth of natural gas per day.

During the first quarters of 2014 and 2013, NiSource received $0.5 million and $0.4 million of available accumulated earnings, respectively. NiSource made no contributions during 2014 or 2013.

Nature of Sales

Columbia Transmission and Columbia Gulf compete for transportation customers based on the type of service a customer needs, operating flexibility, available capacity and price. Columbia Gulf and Columbia Transmission provide a significant portion of total transportation services under firm contracts and derive a smaller portion of revenues through interruptible contracts, with management seeking to maximize the portion of physical capacity sold under firm contracts.

Firm service contracts require pipeline capacity to be reserved for a given customer between certain receipt and delivery points. Firm customers generally pay a “capacity reservation” fee based on the amount of capacity being reserved regardless of whether the capacity is used, plus an incremental usage fee when the capacity is used. Annual capacity reservation revenues derived from firm service contracts generally remain constant over the life of the contract because the revenues are based upon capacity reserved and not whether the capacity is actually used. The high percentage of revenue derived from capacity reservation fees mitigates the risk of revenue fluctuations within the Columbia Pipeline Group Operations segment due to changes in near-term supply and demand conditions. The following percentages exclude the impact of intrasegment revenues and over / under collections of tracker-related revenues. For the quarter ended March 31, 2014, approximately 92.6% of the transportation revenues were derived from capacity reservation fees paid under firm contracts and 5.2% of the transportation revenues were derived from usage fees under firm contracts compared to approximately 92.1% and 6.5%, respectively, for the quarter ended March 31, 2013.

Interruptible transportation service is typically short term in nature and is generally used by customers that either do not need firm service or have been unable to contract for firm service. These customers pay a usage fee only for the volume of gas actually transported. The ability to provide this service is limited to available capacity not otherwise used by firm customers, and customers receiving services under interruptible contracts are not assured capacity in the pipeline facilities. Columbia Pipeline Group Operations provides interruptible service at competitive prices in order to capture short term market opportunities as they occur and interruptible service is viewed by management as an important strategy to optimize revenues from the gas transmission assets. For the quarters ended March 31, 2014 and 2013, approximately 2.2% and 1.4%, respectively, of the transportation revenues were derived from interruptible contracts.

Regulatory Matters

Refer to Note 7, “Regulatory Matters,” in the Notes to Condensed Consolidated Financial Statements (unaudited) for information on regulatory matters for the Columbia Pipeline Group Operations segment.

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ITEM 2.MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITIONS AND RESULTS OF OPERATIONS (continued)

NiSource Inc.

Columbia Pipeline Group Operations

Environmental Matters

Various environmental matters occasionally impact the Columbia Pipeline Group Operations segment. As of March 31, 2014, a reserve has been recorded to cover probable and estimable environmental response actions. Refer to Note 17-C, “Environmental Matters,” in the Notes to Condensed Consolidated Financial Statements (unaudited) for additional information regarding environmental matters for the Columbia Pipeline Group Operations segment.

Throughput

Columbia Transmission's throughput consists of gas transportation service deliveries to LDC city gates, to gas fired power plants, other industrial customers, or other interstate pipelines in its market area. Columbia Transmission's market area covers portions of northeastern, mid-Atlantic, midwestern, and southern states as well as the District of Columbia. Gas delivered via transportation services to storage is not accounted for as throughput until it is withdrawn from storage and delivered to one of the aforementioned locations via a transportation service. Throughput for Columbia Gulf traditionally consists of gas delivered to Columbia Transmission at Leach, Kentucky as well as gas delivered south of Leach to other interstate pipelines or to an LDC's city gate. Recent changes in market conditions have resulted in more non-traditional throughput such as backhaul transportation services that originate in Leach that flow southward. Columbia Gulf has begun to flow gas in a southerly direction from its Louisiana interconnects to markets in the southeastern United States. Crossroads Pipeline serves customers in northern Indiana and Ohio via gas flowing west to east originating from outside the Chicago area to Cygnet, Ohio where it interconnects with Columbia Transmission. Intra-segment eliminations represent gas delivered to an affiliated pipeline within the segment.

Throughput for the Columbia Pipeline Group Operations segment totaled 588.5 MMDth for the first quarter of 2014, compared to 537.1 MMDth for the same period in 2013. The increase of 51.4 MMDth was primarily attributable to colder weather, which drove a majority of the increase on the Columbia Transmission system.

Net Revenues

Net revenues were $345.5 million for the first quarter of 2014, an increase of $44.2 million from the same period in 2013. The increase in net revenues is due primarily to higher regulatory trackers, which are offset in expense, of $24.5 million, increased demand and commodity revenue of $9.9 million as a result of growth projects placed in service and an increase in mineral rights royalty revenue of $7.1 million.

Operating Income

Operating income was $158.9 million for the first quarter of 2014, an increase of $25.4 million from the first quarter of 2013. Operating income increased as a result of higher net revenues, as described above, and higher equity earnings partially offset by increased operating expenses. Equity earnings increased $2.7 million due to higher earnings at Millennium. Operating expenses were $21.5 million higher than the comparable period primarily as a result of increased regulatory trackers, which are offset in net revenue, of $24.5 million, higher employee and administrative expenses of $6.5 million, increased depreciation of $4.0 million and higher property taxes of $1.5 million. These increases were partially offset by gains on the sale of assets of $17.5 million resulting from conveyances of mineral interests.

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ITEM 2.MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITIONS AND RESULTS OF OPERATIONS (continued)

NiSource Inc.

Electric Operations

	Three Months Ended March 31,
(in millions)	2014		2013
Net Revenues
Sales revenues	$	450.4	$	377.6
Less: Cost of sales (excluding depreciation and amortization)	180.4		124.9
Net Revenues	270.0		252.7
Operating Expenses
Operation and maintenance	112.5		107.9
Depreciation and amortization	60.4		63.2
Other taxes	18.2		16.4
Total Operating Expenses	191.1		187.5
Operating Income	$	78.9	$	65.2
Revenues ($ in millions)
Residential	$	113.2	$	108.3
Commercial	106.2		103.7
Industrial	179.7		159.4
Wholesale	21.4		1.7
Other	29.9		4.5
Total	$	450.4	$	377.6
Sales (Gigawatt Hours)
Residential	896.2		864.1
Commercial	935.5		921.2
Industrial	2,607.1		2,319.6
Wholesale	311.8		61.3
Other	33.4		33.2
Total	4,784.0		4,199.4
Electric Customers
Residential	402,676		401,559
Commercial	54,378		54,084
Industrial	2,370		2,373
Wholesale	724		725
Other	5		6
Total	460,153		458,747

NiSource generates and distributes electricity, through its subsidiary NIPSCO, to approximately 460 thousand customers in 20 counties in the northern part of Indiana. The operating results reflect the temperature-sensitive nature of customer demand with annual sales affected by temperatures in the northern part of Indiana. As a result, segment operating income is generally higher in the second and third quarters, reflecting cooling demand during the summer season.

Electric Supply

On October 28, 2011, NIPSCO filed its 2011 Integrated Resource Plan with the IURC. The plan evaluates demand-side and supply-side resource alternatives to reliably and cost-effectively meet NIPSCO customers' future energy requirements over the next twenty years. Existing resources are expected to be sufficient, assuming favorable outcomes for environmental upgrades, to meet customers' needs for the next decade. NIPSCO continues to monitor and assess economic, regulatory and legislative activity, and will update its resource plan as appropriate.

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ITEM 2.MANAGEMENT’S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITIONS AND RESULTS OF OPERATIONS (continued)

NiSource Inc.

Electric Operations

Regulatory Matters

Refer to Note 7, “Regulatory Matters,” in the Notes to Condensed Consolidated Financial Statements (unaudited) for information on significant rate developments and cost recovery and trackers for the Electric Operations segment.

Environmental Matters

Various environmental matters occasionally impact the Electric Operations segment. As of March 31, 2014, a reserve has been recorded to cover probable and estimable environmental response actions. Refer to Note 17-C, “Environmental Matters,” in the Notes to Condensed Consolidated Financial Statements (unaudited) for additional information regarding environmental matters for the Electric Operations segment.

Sales

Electric Operations sales quantities for the first quarter 2014 were 4,784.0 gwh, an increase of 584.6 gwh compared to the first quarter of 2013. The 13.9% increase is primarily attributable to increases in industrial usage and sales for resale. The increase in industrial usage was primarily attributable to lower internal generation from large industrial customers. The increase in sales for resale was primarily attributable to increased opportunities for off-system sales due to the cold weather that occurred during the first quarter of 2014.

Net Revenues

Net revenues were $270.0 million for the first quarter of 2014, an increase of $17.3 million from the same period in 2013. The increase in net revenues is due primarily to an increase in off-system sales of $9.5 million, higher industrial usage of $8.6 million, an increase in the return on the environmental capital investment recovery of $8.1 million due to an increased plant balance eligible for recovery, and the effects of colder weather of $4.4 million. These increases were partially offset by a decrease in transmission upgrade revenue of $6.3 million, decreased trackers, which are offset in expense, of $5.1 million and lower residential and commercial usage of $2.2 million.

At NIPSCO, sales revenues and customer billings are adjusted for amounts related to under and over-recovered purchased fuel costs from prior periods per regulatory order. These amounts are primarily reflected in the “Other” gross revenues statistic provided at the beginning of this segment discussion. The adjustment to Other gross revenues for the three months ended March 31, 2014 was a revenue increase of $20.3 million compared to a revenue decrease of $7.2 million for three months ended March 31, 2013.

Operating Income

For the first quarter of 2014, Electric Operations reported operating income of $78.9 million, an increase of $13.7 million from the comparable 2013 period. Operating income increased as a result of higher net revenues, as described above, partially offset by increased operating expenses. Operating expenses increased $3.6 million due primarily to higher employee and administrative expenses of $6.6 million and increased other taxes of $1.8 million. These increases were partially offset by a decrease in trackers, which are offset in net revenue, of $5.1 million.

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ITEM 3. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK

NiSource Inc.

For a discussion regarding quantitative and qualitative disclosures about market risk see “Management’s Discussion and Analysis of Financial Condition and Results of Operations - Market Risk Disclosures.”

ITEM 4. CONTROLS AND PROCEDURES

Evaluation of Disclosure Controls and Procedures

NiSource’s Chief Executive Officer and its Principal Financial Officer, after evaluating the effectiveness of NiSource’s disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)), have concluded based on the evaluation required by paragraph (b) of Exchange Act Rules 13a-15 and 15d-15 that, as of the end of the period covered by this report, NiSource’s disclosure controls and procedures are considered effective.

Changes in Internal Controls

There have been no changes in NiSource’s internal control over financial reporting during the fiscal quarter covered by this report that has materially affected, or is reasonably likely to materially affect, NiSource’s internal control over financial reporting.

53

PART II

ITEM 1. LEGAL PROCEEDINGS

NiSource Inc.

None.

ITEM 1A. RISK FACTORS

There were no material changes from the risk factors disclosed in NiSource’s 2013 Annual Report on Form 10-K filed on February 18, 2014.

ITEM 2. UNREGISTERED SALES OF EQUITY SECURITIES AND USE OF PROCEEDS

None.

ITEM 3. DEFAULTS UPON SENIOR SECURITIES

None.

ITEM 4. MINE SAFETY DISCLOSURES

Not applicable.

ITEM 5. OTHER INFORMATION

None.

54

ITEM 6. EXHIBITS

NiSource Inc.

(10.1)	Form of Performance Share Award Agreement under the 2010 Omnibus Incentive Plan.
(31.1)	Certification of Robert C. Skaggs, Jr., Chief Executive Officer, pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
(31.2)	Certification of Stephen P. Smith, Chief Financial Officer, pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
(32.1)	Certification of Robert C. Skaggs, Jr., Chief Executive Officer, pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 (furnished herewith).
(32.2)	Certification of Stephen P. Smith, Chief Financial Officer, pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 (furnished herewith).
(101.INS)	XBRL Instance Document
(101.SCH)	XBRL Schema Document
(101.CAL)	XBRL Calculation Linkbase Document
(101.LAB)	XBRL Labels Linkbase Document
(101.PRE)	XBRL Presentation Linkbase Document
(101.DEF)	XBRL Definition Linkbase Document

Pursuant to Item 601(b)(4)(iii) of Regulation S-K, NiSource hereby agrees to furnish the SEC, upon request, any instrument defining the rights of holders of long-term debt of NiSource not filed as an exhibit herein. No such instrument authorizes long-term debt securities in excess of 10% of the total assets of NiSource and its subsidiaries on a consolidated basis.

55

SIGNATURE

NiSource Inc.

Pursuant to the requirements of the Securities Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized.

			NiSource Inc.
			(Registrant)
Date:	April 30, 2014	By:	/s/ Jon D. Veurink
			Jon D. Veurink
			Vice President and Chief Accounting Officer (Principal Accounting Officer and Duly Authorized Officer)

56

EX-10.1

Exhibit 10.1

NiSource Inc.

2010 Omnibus Incentive Plan

Performance Share Award Agreement

This Performance Share Award Agreement (the “Agreement”), is made and entered into as of DATE (the “Date of Grant”), by and between NiSource Inc., a Delaware corporation (the “Company”), and _____________________, an Employee of the Company (the “Grantee”).

Section 1. Performance Share Award. The Company hereby grants to the Grantee, on the terms and conditions hereinafter set forth, an Award of ___________ Performance Shares. The Performance Shares will be represented by a bookkeeping entry (the “Performance Share Account”) of the Company, and each Performance Share will be settled with one share of the Company’s common stock to the extent provided under this Agreement and the Plan.

Section 2. Grantee Accounts. The number of Performance Shares granted pursuant to this Agreement shall be credited to the Grantee’s Performance Share Account. Each Performance Share Account shall be maintained on the books of the Company until full payment of the balance thereof has been made to the Grantee (or the Grantee’s beneficiaries or estate if the Grantee is deceased) in accordance with Section 1 above. No funds shall be set aside or earmarked for any Performance Share Account, which shall be purely a bookkeeping device.

Section 3. Performance Period. The “Performance Period” is the period beginning on January 1, 2014, and ending on December 31, 2016.

Section 4. Vesting andLapse of Performance Restrictions.

(a) Performance Restrictions. The Performance Restrictions shall lapse only upon both the Grantee’s continued employment through February 28, 2017 and the date the Committee certifies the following results (including interpolation between the results, expressed as a percentage of the target except as otherwise noted below):

(i) The Performance Restrictions of fifty percent of the Award shall lapse based on achievement of cumulative “net operating earnings” per Share for the Performance Period in accordance with the following schedule:

Cumulative Net Operating Earnings Per Share	Percentage of Award Granted
<$5.11	0%
$5.11	50%
$5.26	100%
>$5.63	200%

(ii) The Performance Restrictions of fifty percent of the Award shall lapse based on the Company’s positive Relative Total Shareholder Return (“RTSR”) as of the last day of the Performance Period in accordance with the following schedule:

RTSR* Percent Ranking	Percentage of Award Granted
<40th	0%
>40th and <50th**	50%
50th	100%
100th	200%

*Relative Total Shareholder Return (RTSR) is the annualized growth in the dividends and share price of a share of the Company’s common stock, calculated using a 20 day trading average of the Company’s closing price beginning December 31, 2013 and ending December 31, 2016 compared to the TSR performance of a peer group of companies determined by the Committee at its meeting on January 30, 2014.

Negative TSR for the Performance Period will result in a maximum payout at target regardless of relative performance.

** There is no interpolation between goals below the 50^th percentile for the RTSR metric.

(b) Committee Certification. As soon as practicable after the end of the Performance Period, the Committee will certify in writing whether the Performance Restrictions have been met for the Performance Period and determine the number of Shares, if any, that will be payable to the Grantee; provided, however, that if the Committee certifies that the Performance Restrictions have been met, the Committee may, in its sole discretion, adjust the number of Shares payable to the Grantee with respect to the Award to reflect the effect of extraordinary events upon the Performance Restrictions, as provided under the Plan. The date of the Committee’s certification under this Section shall hereinafter be referred to as the “Certification Date.” The Company will notify the Grantee (or the executors or administrators of the Grantee’s estate, if appropriate) of the Committee’s certification following the Certification Date (such notice being the “Determination Notice”). The Determination Notice shall specify (i) the Company’s cumulative net operating earnings per share and Relative Total Shareholder Return for the Performance Period and (ii) the number of Shares payable in accordance with the Committee’s certification.

(c) Effect of Termination of Service Before February 28, 2017. Except as set forth below, if Grantee’s Service is terminated for any reason prior to February 28, 2017 or prior to the occurrence of any otherwise applicable vesting event provided in this Section, the Grantee shall forfeit the Performance Shares credited to the Grantee’s Performance Share Account. Notwithstanding the foregoing, in the event that Grantee’s Service terminates prior to February 28, 2017 as a result of (i) Grantee’s Retirement; or (ii) Grantee’s Disability; or (iii) Grantee’s death and such death occurs with less than or equal to twelve months remaining in the Performance Period, the Grantee shall receive a pro rata distribution of Shares after the certification date described in part (a) above; provided that the Committee actually certifies that the Performance Restrictions for the Performance Period have been met. Such pro rata

grant of Shares shall be determined using a fraction, where the numerator shall be the number of full or partial calendar months elapsed between the Date of Grant and the date the Grantee terminates Service, and the denominator shall be the number of full or partial calendar months elapsed between the Date of Grant and February 28, 2017. Additionally, if the Grantee terminates Service due to death prior to February 28, 2017 with more than 12 months remaining in the Performance Period, the Grantee shall receive, as soon as practicable after the date of termination, a pro rata distribution of Shares equal to the number of Shares that the Grantee otherwise would have received had the Performance Restrictions been met at target for the Performance Period. Such pro rata grant of Shares shall be determined using a fraction, where the numerator shall be the number of full or partial calendar months elapsed between the Date of Grant and the date the Grantee terminates Service, and the denominator shall be the number of full or partial calendar months elapsed between the Date of Grant and February 28, 2017. For purposes of this Agreement, “Retirement” means the Grantee’s attainment of age 55 and 10 years of Service.

(d) Change in Control. Notwithstanding the foregoing provisions, all Performance Shares shall become fully and immediately vested, and all restrictions shall lapse, on the fifth business day before the date of consummation of a Change in Control of the Company.

(e) Code Section 162(m) Limitation. Notwithstanding the previous provisions of this Section, during any calendar year with respect to which the Grantee is a Covered Officer (for purposes of Internal Revenue Code (“Code”) Section 162 (m)), if the Grantee otherwise would vest in a number of Performance Shares under this Section, the Grantee instead may vest only with respect to a sufficient number of Performance Shares whose aggregate Fair Market Value on the date such restrictions would, when added to the Grantee’s “applicable employee remuneration” (as defined in Code Section 162(m)) for the applicable calendar year that does not constitute “qualified performance-based compensation” (as defined in Code Section 162(m)), not exceed the aggregate amount of $999,999.00 for the applicable calendar year (the “Limitation”).

To the extent the restrictions on any Performance Shares do not lapse due to the application of this Section, the restrictions on such Performance Shares shall lapse on the first to occur of:

(i)the last business day of any subsequent calendar year or years to the extent that the Limitation is not exceeded for such year or years;

(ii)the date next following the Grantee’s termination of Service for any reason other than for Cause, or

(iii)the first business day of the year next following the year with respect to which the Grantee ceases to be a Covered Officer.

The Company will make all determinations as to whether the lapse of restrictions on any Performance Shares is delayed in accordance with this Section. Such determinations will be made on a uniform and non-discriminatory basis consistent with the requirements under Code Section 409A.

Section 5. Delivery of Shares. Once Performance Shares have vested under this Agreement, the Company will convert the Performance Shares in the Grantee’s Performance Share Account into Shares and

deliver the total number of Shares due to the Grantee as soon as administratively possible after such date, but no later than March 15, 2017. The delivery of the Shares shall be subject to payment of the applicable withholding tax liability and the forfeiture provisions of this Agreement. If the Grantee dies before the Company has distributed any portion of the vested Performance Shares, the Company will transfer any Shares with respect to the vested Performance Shares in accordance with the Grantee’s written beneficiary designation or to the Grantee’s estate if no written beneficiary designation is provided.

Section 6.  Withholding of Taxes. The Company shall have the power and the right to deduct or withhold, or require the Grantee to remit to the Company, an amount sufficient to satisfy federal, state, and local taxes, domestic or foreign, required by law or regulation to be withheld with respect to any taxable event arising as a result of this Agreement.

Section 7. Securities Law Compliance. The delivery of all or any Shares that relate to the Performance Shares shall only be effective at such time that the issuance of such Shares will not violate any state or federal securities or other laws. The Company is under no obligation to effect any registration of Shares under the Securities Act of 1933 or to effect any state registration or qualification of the Shares that may be issued under this Agreement. The Company may, in its sole discretion, delay the delivery of Shares or place restrictive legends on Shares in order to ensure that the issuance of any Shares will be in compliance with federal or state securities laws and the rules of any exchange upon which the Company’s Shares are traded. If the Company delays the delivery of Shares in order to ensure compliance with any state or federal securities or other laws, the Company shall deliver the Shares at the earliest date at which the Company reasonably believes that such delivery will not cause such violation, or at such later date that may be permitted under Code Section 409A.

Section 8. Restriction on Transferability. Except as otherwise provided under the Plan, until the Performance Shares have vested under this Agreement, the Performance Shares granted herein and the rights and privileges conferred hereby may not be sold, transferred, pledged, assigned, or otherwise alienated or hypothecated (by operation of law or otherwise), other than by will or the laws of descent and distribution. Any attempted transfer in violation of the provisions of this paragraph shall be void, and the purported transferee shall obtain no rights with respect to such Performance Shares.

Section 9. Grantee’s Rights Unsecured. The right of the Grantee or his or her beneficiary to receive a distribution hereunder shall be an unsecured claim against the general assets of the Company, and neither the Grantee nor his or her beneficiary shall have any rights in or against any amounts credited to the Grantee’s Performance Share Account or any other specific assets of the Company. All amounts credited to the Grantee’s Performance Share Account shall constitute general assets of the Company and may be disposed of by the Company at such time and for such purposes, as it may deem appropriate.

Section 10.  No Rights as Stockholder or Employee.

(a) The Grantee shall not have any privileges of a stockholder of the Company with respect to any Performance Shares subject to this Agreement, nor shall the Company have any obligation to issue any dividends or otherwise afford any rights to which Shares are entitled with respect to any such Performance Shares.

(b) Nothing in this Agreement or the Award shall confer upon the Grantee any right to continue as an Employee of the Company or any Affiliate or to interfere in any way with the right of the Company or any Affiliate to terminate the Grantee’s Service at any time.

Section 11.  Adjustments. If at any time while the Award is outstanding, the number of outstanding Performance Shares is changed by reason of a reorganization, recapitalization, stock split or any of the other events described in the Plan, the number and kind of Performance Shares shall be adjusted in accordance with the provisions of the Plan. In the event of certain corporate events specified in Article XVI of the Plan, any unvested Performance Shares may be replaced by substituted Awards or forfeited in exchange for payment of cash in accordance with the procedures and provisions of Article XVI of the Plan.

Section 12.  Notices. Any notice hereunder by the Grantee shall be given to the Company in writing and such notice shall be deemed duly given only upon receipt thereof at the following address: Corporate Secretary, NiSource Inc., 801 East 86^th Avenue, Merrillville, IN 46410-6271, or at such other address as the Company may designate by notice to the Grantee.

Any notice hereunder by the Company shall be given to the Grantee in writing and such notice shall be deemed duly given only upon receipt thereof at such address as the Grantee may have on file with the Company.

Section 13.  Administration. The administration of this Agreement, including the interpretation and amendment or termination of this Agreement, will be performed in accordance with the Plan. All determinations and decisions made by the Committee, the Board, or any delegate of the Committee as to the provisions of this Agreement shall be conclusive, final, and binding on all persons. This Agreement at all times shall be governed by the Plan and in no way alter or modify the Plan. To the extent a conflict exists between this Agreement and the Plan, the provisions of the Plan shall govern. Notwithstanding the foregoing, if subsequent guidance is issued under Code Section 409A that would impose additional taxes, penalties, or interest to either the Company or the grantee, the Company may administer this Agreement in accordance with such guidance and amend this Agreement without the Consent of the Grantee to the extent such actions, in the reasonable judgment of the Company, are considered necessary to avoid the imposition of such additional taxes, penalties, or interest.

Section 14. Governing Law. This Agreement shall be construed and enforced in accordance with the laws of the State of Indiana, without giving effect to the choice of law principles thereof.

Section 15. Government Regulations. Notwithstanding anything contained herein to the contrary, the Company’s obligation to issue or deliver certificates evidencing the Performance Shares shall be subject to all applicable laws, rules and regulations, and to such approvals by any governmental agencies or national securities exchanges as may be required.

Section 16. Entire Agreement; Code Section 409A Compliance. This Agreement and the Plan contain the terms and conditions with respect to the subject matter hereof and supersede any previous agreements, written or oral, relating to the subject matter hereof. This Agreement is pursuant to the terms of the Company’s 2010 Omnibus Incentive Plan (the “Plan”). The applicable terms of the Plan are incorporated herein by reference, including the definition of capitalized terms contained in the Plan, and including the Code Section 409A provisions of Section XIX of the Plan. This Agreement shall be interpreted in accordance with Code Section 409A including the rules related to payment timing for specified employees. This Agreement shall be deemed to be modified to the maximum extent necessary to be in compliance with Code Section 409A’s rules. If the Grantee is unexpectedly required to include in the Grantee’s current year’s income any amount of compensation relating to the Performance Shares because of a failure to meet the requirements of Code Section 409A, then to the extent permitted by Code Section 409A, the Grantee may receive a distribution of Shares in an amount not to exceed the amount required to be included in income as a result of the failure to comply with Code Section 409A.

IN WITNESS WHEREOF, the Company has caused this Award to be granted, and the Grantee has accepted this Award, as of the date first above written.

NISOURCE INC GRANTEE

By: ______________________ By:   _____________________

Its: ______________________

EX-31.1

Exhibit 31.1

Certification Pursuant to

Section 302 of the Sarbanes-Oxley Act of 2002

I, Robert C. Skaggs, Jr., certify that:

1. I have reviewed this Quarterly Report of NiSource Inc. on Form 10-Q for the quarter ended March 31, 2014;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a. Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b. Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c. Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d. Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a. All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b. Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date:	April 30, 2014	By:	/s/ Robert C. Skaggs, Jr.
			Robert C. Skaggs, Jr.
			Chief Executive Officer

EX-31.2

Exhibit 31.2

Certification Pursuant to

Section 302 of the Sarbanes-Oxley Act of 2002

I, Stephen P. Smith, certify that:

1. I have reviewed this Quarterly Report of NiSource Inc. on Form 10-Q for the quarter ended March 31, 2014;

2. Based on my knowledge, this report does not contain any untrue statement of a material fact or omit to state a material fact necessary to make the statements made, in light of the circumstances under which such statements were made, not misleading with respect to the period covered by this report;

3. Based on my knowledge, the financial statements, and other financial information included in this report, fairly present in all material respects the financial condition, results of operations and cash flows of the registrant as of, and for, the periods presented in this report;

4. The registrant’s other certifying officer(s) and I are responsible for establishing and maintaining disclosure controls and procedures (as defined in Exchange Act Rules 13a-15(e) and 15d-15(e)) and internal control over financial reporting (as defined in Exchange Act Rules 13a-15(f) and 15d-15(f)) for the registrant and have:

a. Designed such disclosure controls and procedures, or caused such disclosure controls and procedures to be designed under our supervision, to ensure that material information relating to the registrant, including its consolidated subsidiaries, is made known to us by others within those entities, particularly during the period in which this report is being prepared;

b. Designed such internal control over financial reporting, or caused such internal control over financial reporting to be designed under our supervision, to provide reasonable assurance regarding the reliability of financial reporting and the preparation of financial statements for external purposes in accordance with generally accepted accounting principles;

c. Evaluated the effectiveness of the registrant’s disclosure controls and procedures and presented in this report our conclusions about the effectiveness of the disclosure controls and procedures, as of the end of the period covered by this report based on such evaluation; and

d. Disclosed in this report any change in the registrant’s internal control over financial reporting that occurred during the registrant’s most recent fiscal quarter (the registrant’s fourth fiscal quarter in the case of an annual report) that has materially affected, or is reasonably likely to materially affect, the registrant’s internal control over financial reporting; and

5. The registrant’s other certifying officer(s) and I have disclosed, based on our most recent evaluation of internal control over financial reporting, to the registrant’s auditors and the audit committee of the registrant’s board of directors (or persons performing the equivalent functions):

a. All significant deficiencies and material weaknesses in the design or operation of internal control over financial reporting which are reasonably likely to adversely affect the registrant’s ability to record, process, summarize and report financial information; and

b. Any fraud, whether or not material, that involves management or other employees who have a significant role in the registrant’s internal control over financial reporting.

Date:	April 30, 2014	By:	/s/ Stephen P. Smith
			Stephen P. Smith
			Executive Vice President and Chief Financial Officer

EX-32.1

Exhibit 32.1

Certification Pursuant to

Section 906 of the Sarbanes-Oxley Act of 2002

In connection with the Quarterly Report of NiSource Inc. (the “Company”) on Form 10-Q for the quarter ending March 31, 2014 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Robert C. Skaggs, Jr., Chief Executive Officer of the Company, certify, pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

(1) The Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2) The information contained in the Report fairly presents, in all material respects, the financial condition and result of operations of the Company.

		/s/ Robert C. Skaggs, Jr.
		Robert C. Skaggs, Jr.
		Chief Executive Officer
Date:	April 30, 2014

EX-32.2

Exhibit 32.2

Certification Pursuant to

Section 906 of the Sarbanes-Oxley Act of 2002

In connection with the Quarterly Report of NiSource Inc. (the “Company”) on Form 10-Q for the quarter ending March 31, 2014 as filed with the Securities and Exchange Commission on the date hereof (the “Report”), I, Stephen P. Smith, Executive Vice President and Chief Financial Officer of the Company, certify, pursuant to Section 906 of the Sarbanes-Oxley Act of 2002, that:

(1) The Report fully complies with the requirements of section 13(a) or 15(d) of the Securities Exchange Act of 1934; and

(2) The information contained in the Report fairly presents, in all material respects, the financial condition and result of operations of the Company.

		/s/ Stephen P. Smith
		Stephen P. Smith
		Executive Vice President and Chief Financial Officer
Date:	April 30, 2014

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Accumulated Other Comprehensive Loss (Tables)

3 Months Ended

Mar. 31, 2014

Other Comprehensive Income (Loss), Tax [Abstract]

Components Of Accumulated Other Comprehensive Loss

Three Months Ended March 31, 2014 (in millions)	Gains and Losses on Securities(1)			Gains and Losses on Cash Flow Hedges(1)			Pension and OPEB Items(1)			Accumulated Other Comprehensive Loss(1)
Balance as of January 1, 2014	$	(0.3	)	$	(25.8	)	$	(17.5	)	$	(43.6	)
Other comprehensive income before reclassifications	0.5			0.1			—			0.6
Amounts reclassified from accumulated other comprehensive income	(0.2		)	0.5			0.2			0.5
Net current-period other comprehensive income	0.3			0.6			0.2			1.1
Balance as of March 31, 2014	$	—		$	(25.2	)	$	(17.3	)	$	(42.5	)

Three Months Ended March 31, 2013 (in millions)	Gains and Losses on Securities(1)			Gains and Losses on Cash Flow Hedges(1)			Pension and OPEB Items(1)			Accumulated Other Comprehensive Loss(1)
Balance as of January 1, 2013	$	2.6		$	(28.6	)	$	(39.5	)	$	(65.5	)
Other comprehensive income before reclassifications	(0.1		)	0.1			1.3			1.3
Amounts reclassified from accumulated other comprehensive income	(0.3		)	0.8			1.4			1.9
Net current-period other comprehensive income	(0.4		)	0.9			2.7			3.2
Balance as of March 31, 2013	$	2.2		$	(27.7	)	$	(36.8	)	$	(62.3	)

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Fair Value (Fair Value Of Financial Assets And Liabilities Measured On A Recurring Basis) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Available-for-sale securities	$ 120.1	$ 121.4
Fair value assets measured on recurring basis, total	134.5	144.6
Fair value liabilities measured on recurring basis, total	0.4	1.7
Financial Price Risk Programs [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Fair value assets measured on recurring basis, derivative financial instruments	3.7	2.1
Fair value liabilities measured on recurring basis, total	0.4	1.7
Interest Rate Risk Activities [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Fair value assets measured on recurring basis, derivative financial instruments	10.7	21.1
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Available-for-sale securities	24.2	25.3
Fair value assets measured on recurring basis, total	27.9	27.4
Fair value liabilities measured on recurring basis, total	0.1	1.6
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Financial Price Risk Programs [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Fair value assets measured on recurring basis, derivative financial instruments	3.7	2.1
Fair value liabilities measured on recurring basis, derivative financial instruments	0.1	1.6
Quoted Prices In Active Markets For Identical Assets (Level 1) [Member] | Interest Rate Risk Activities [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Fair value assets measured on recurring basis, derivative financial instruments	0	0
Significant Other Observable Inputs (Level 2) [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Available-for-sale securities	95.9	96.1
Fair value assets measured on recurring basis, total	106.6	117.2
Fair value liabilities measured on recurring basis, total	0	0
Significant Other Observable Inputs (Level 2) [Member] | Financial Price Risk Programs [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Fair value assets measured on recurring basis, derivative financial instruments	0	0
Fair value liabilities measured on recurring basis, derivative financial instruments	0	0
Significant Other Observable Inputs (Level 2) [Member] | Interest Rate Risk Activities [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Fair value assets measured on recurring basis, derivative financial instruments	10.7	21.1
Significant Unobservable Inputs (Level 3) [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Available-for-sale securities	0	0
Fair value assets measured on recurring basis, total	0	0
Fair value liabilities measured on recurring basis, total	0.3	0.1
Significant Unobservable Inputs (Level 3) [Member] | Financial Price Risk Programs [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Fair value assets measured on recurring basis, derivative financial instruments	0	0
Fair value liabilities measured on recurring basis, derivative financial instruments	0.3	0.1
Significant Unobservable Inputs (Level 3) [Member] | Interest Rate Risk Activities [Member]
Fair Value Assets And Liabilities Measured On Recurring Basis [Line Items]
Fair value assets measured on recurring basis, derivative financial instruments	$ 0	$ 0

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Risk Management Activities (Narrative) (Details) (USD $)	0 Months Ended		3 Months Ended					3 Months Ended	12 Months Ended
	Sep. 16, 2005	Jul. 22, 2003	Mar. 31, 2014	Mar. 31, 2013	Dec. 31, 2013	Sep. 16, 2005 5.25% - Due September 15, 2017 [Member]	Sep. 16, 2005 5.45% - Due September 15, 2020 [Member]	Mar. 31, 2014 Millennium Pipeline Company, L.L.C [Member]	Dec. 31, 2013 Millennium Pipeline Company, L.L.C [Member]
Derivative Instruments Gain Loss [Line Items]
Long-term Debt, Percentage Bearing Fixed Interest, Amount			$ 7,700,000,000
Additional Collateral, Aggregate Fair Value			900,000
Gain (Loss) on Cash Flow Hedge Ineffectiveness, Net			0	0
Face amount of notes						1,000,000,000	1,000,000,000
Outstanding debt subject to interest rate fluctuations			500,000,000
Derivative, Notional Amount	900,000,000	500,000,000
Number of counterparties in swap agreement		4
Date of Right To Cancel Swaps		Jul. 15, 2014
Fixed interest rate under swap agreement		5.40%
Floating interest amount, average interest addition		0.78%
Number of counterparties in swap agreement settled	6
Payment for settlement of interest rate swap	35,500,000
Forward starting interest rate swap settlement amount			7,800,000
Percentage of interest in Millennium								47.50%
Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months			100,000
Interest rate on debt						5.25%	5.45%
Debt Instrument, Interest Rate, Effective Percentage						5.67%	5.88%
Other Comprehensive Income Unrecognized Gain Loss On Derivatives Arising During Period Net Of Tax								17,400,000	17,700,000
Cash on deposit with brokers for margin requirements			$ 5,300,000		$ 5,900,000

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Accumulated Other Comprehensive Loss (Components Of Accumulated Other Comprehensive Loss) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	$ (43.6)	$ (65.5)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	0.6	1.3
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	0.5	1.9
Other Comprehensive Income (Loss), Net of Tax	1.1	3.2
Ending Balance	(42.5)	(62.3)
Accumulated Net Unrealized Investment Gain (Loss) [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(0.3)	2.6
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	0.5	(0.1)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(0.2)	(0.3)
Other Comprehensive Income (Loss), Net of Tax	0.3	(0.4)
Ending Balance	0	2.2
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(25.8)	(28.6)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	0.1	0.1
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	0.5	0.8
Other Comprehensive Income (Loss), Net of Tax	0.6	0.9
Ending Balance	(25.2)	(27.7)
Accumulated Defined Benefit Plans Adjustment [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	(17.5)	(39.5)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	0	1.3
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	0.2	1.4
Other Comprehensive Income (Loss), Net of Tax	0.2	2.7
Ending Balance	$ (17.3)	$ (36.8)

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Fair Value (Available-For-Sale Debt Securities) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2014	Dec. 31, 2013
Fair Value Disclosure [Line Items]
Amortized Cost	$ 120.0	$ 121.8
Gross Unrealized Gains	1.4	1.4
Gross Unrealized Losses	(1.3)	(1.8)
Fair Value	120.1	121.4
Government [Member]
Fair Value Disclosure [Line Items]
Amortized Cost	27.0	30.3
Gross Unrealized Gains	0.2	0.3
Gross Unrealized Losses	(0.4)	(0.5)
Fair Value	26.8	30.1
Corporate/Other Bonds [Member]
Fair Value Disclosure [Line Items]
Amortized Cost	93.0	91.5
Gross Unrealized Gains	1.2	1.1
Gross Unrealized Losses	(0.9)	(1.3)
Fair Value	$ 93.3	$ 91.3

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Asset Retirement Obligations (Changes In Company's Liability For Asset Retirement Obligations) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Beginning Balance	$ 174.4	$ 160.4
Accretion expense	0.4	0.3
Accretion recorded as a regulatory asset/liability	2.1	2.3
Additions	0.1	2.9
Settlements	(0.5)	(0.3)
Change in estimated cash flows	0	(0.3)
Ending Balance	$ 176.5	$ 165.3

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Risk Management Activities (Tables)

3 Months Ended

Mar. 31, 2014

Derivative Instruments and Hedges, Assets [Abstract]

Commodity Price Risk Program Derivative Contracted Gross Volumes

	March 31, 2014	December 31, 2013
Commodity Price Risk Program:
Gas price volatility program derivatives (MMDth)	13.9	17.0
Price Protection Service program derivatives (MMDth)	0.3	0.7
DependaBill program derivatives (MMDth)	0.1	0.2
Electric energy program FTR derivatives (mw)	—	1,248.0

Location And Fair Value Of Derivative Instruments On Consolidated Balance Sheets

Asset Derivatives(in millions)	March 31, 2014		December 31, 2013
Balance Sheet Location	Fair Value		Fair Value
Derivatives designated as hedging instruments
Commodity price risk programs
Price risk management assets (current)	$	0.1	$	—
Interest rate risk activities
Price risk management assets (current)	10.7		21.2
Total derivatives designated as hedging instruments	$	10.8	$	21.2
Derivatives not designated as hedging instruments
Commodity price risk programs
Price risk management assets (current)	$	3.6	$	1.5
Price risk management assets (noncurrent)	—		0.5
Total derivatives not designated as hedging instruments	$	3.6	$	2.0
Total Asset Derivatives	$	14.4	$	23.2

Offsetting Assets and Liabilities

Offsetting of Derivative Assets (in millions)
As of March 31, 2014
	Gross Amounts of Recognized Assets		Gross Amounts Offset in the Statement of Financial Position		Net Amounts of Assets Presented in the Statement of Financial Position		Gross Amounts Not Offset in the Statement of Financial Position			Net Amount
Counterparty B	$	3.7	$	—	$	3.7	$	(0.4	)	$	3.3
Other (1)	10.7		—		10.7		—			10.7
Total	$	14.4	$	—	$	14.4	$	(0.4	)	$	14.0

Offsetting of Derivative Liabilities (in millions)
As of March 31, 2014
	Gross Amounts of Recognized Liabilities			Gross Amounts Offset in the Statement of Financial Position		Net Amounts of Liabilities Presented in the Statement of Financial Position			Gross Amounts Not Offset in the Statement of Financial Position		Net Amount
Counterparty B	$	(0.4	)	$	—	$	(0.4	)	$	0.4	$	—
Total	$	(0.4	)	$	—	$	(0.4	)	$	0.4	$	—

Offsetting of Derivative Assets (in millions)
As of December 31, 2013
	Gross Amounts of Recognized Assets		Gross Amounts Offset in the Statement of Financial Position		Net Amounts of Assets Presented in the Statement of Financial Position		Gross Amounts Not Offset in the Statement of Financial Position			Net Amount
Counterparty B	$	2.1	$	—	$	2.1	$	(1.7	)	$	0.4
Other (1)	21.1		—		21.1		—			21.1
Total	$	23.2	$	—	$	23.2	$	(1.7	)	$	21.5

Offsetting of Derivative Liabilities (in millions)
As of December 31, 2013
	Gross Amounts of Recognized Liabilities			Gross Amounts Offset in the Statement of Financial Position		Net Amounts of Liabilities Presented in the Statement of Financial Position			Gross Amounts Not Offset in the Statement of Financial Position		Net Amount
Counterparty B	$	(1.7	)	$	—	$	(1.7	)	$	1.7	$	—
Total	$	(1.7	)	$	—	$	(1.7	)	$	1.7	$	—

⁽¹⁾ Amounts in "Other" include fixed-to-variable interest rate swap agreements entered into by NiSource.

Schedule of Derivative Instruments, Effect on Other Comprehensive Income (Loss)

Derivatives in Cash Flow Hedging Relationships

Three Months Ended (in millions)
	Amount of Gain Recognized in OCI on Derivative (Effective Portion)				Location of Loss Reclassified from  AOCI into Income (Effective Portion)	Amount of (Loss) Gain Reclassified from AOCI into Income (Effective Portion)
Derivatives in Cash Flow Hedging Relationships	March 31, 2014		March 31, 2013			March 31, 2014			March 31, 2013
Commodity price risk programs	$	0.1	$	0.1	Cost of Sales	$	(0.1	)	$	0.1
Interest rate risk activities	—		—		Interest expense, net	(0.4		)	(0.4		)
Total	$	0.1	$	0.1		$	(0.5	)	$	(0.3	)

Schedule of Derivatives Instruments Statements of Financial Performance and Financial Position, Location

Derivatives in Fair Value Hedging Relationships

Three Months Ended (in millions)
Derivatives in Fair Value Hedging Relationships	Location of Loss Recognized in Income on Derivatives	Amount of Loss Recognized in Income on Derivatives
		March 31, 2014			March 31, 2013
Interest rate risk activities	Interest expense, net	$	(10.4	)	$	(9.7	)
Total		$	(10.4	)	$	(9.7	)

Three Months Ended (in millions)
Hedged Item in Fair Value Hedge Relationships	Location of Gain Recognized in Income on Related Hedged Item	Amount of Gain Recognized in Income on Related Hedged Items
		March 31, 2014		March 31, 2013
Fixed-rate debt	Interest expense, net	$	10.4	$	9.7
Total		$	10.4	$	9.7

Derivatives not designated as hedging instruments

Three Months Ended (in millions)
Derivatives Not Designated as Hedging Instruments	Location of Gain (Loss) Recognized in Income on Derivatives	Amount of Realized/Unrealized Gain (Loss) Recognized in Income on Derivatives(1)
		March 31, 2014		March 31, 2013
Commodity price risk programs	Gas Distribution revenues	$	—	$	0.1
Commodity price risk programs	Cost of Sales	6.9		(6.7		)
Commodity price risk programs	(Loss) Income from Discontinued Operations - net of taxes	—		0.2
Total		$	6.9	$	(6.4	)

⁽¹⁾ For the amounts of realized/unrealized gain (loss) recognized in income on derivatives disclosed in the table above, gains of $6.9 million and $6.6 million for the three months ended March 31, 2014 and 2013, respectively, were deferred as allowed per regulatory orders. These amounts will be amortized to income over future periods of up to twelve months as specified in a regulatory order.

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Supplemental Cash Flow Information (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Supplemental Cash Flow [Line Items]
Capital expenditures included in current liabilities	$ 131.4	$ 114.3
Assets acquired under a capital lease	51.6	2.1
Cash paid for interest, net of interest capitalized amounts	167.7	161.8
Cash paid for income taxes	$ 6.8	$ 2.9

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Transfers Of Financial Assets (Narrative) (Details) (USD $) In Millions, unless otherwise specified			3 Months Ended
	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2014 Columbia Gas Of Ohio Receivables Corporation [Member]	Mar. 31, 2014 Columbia Gas Of Pennsylvania Receivables Corporation [Member]	Mar. 31, 2014 NIPSCO Accounts Receivable Corporation [Member]	Mar. 31, 2014 Maximum [Member] Accounts Receivable Program [Member]	Mar. 31, 2014 Maximum [Member] Columbia Gas Of Ohio Receivables Corporation [Member]	Mar. 31, 2014 Maximum [Member] Columbia Gas Of Pennsylvania Receivables Corporation [Member]	Mar. 31, 2014 Maximum [Member] NIPSCO Accounts Receivable Corporation [Member]
Assets and Associated Liabilities of Transfers Accounted for as Secured Borrowings [Line Items]
Accounts receivable securitization facility borrowings	$ 515.0	$ 265.1				$ 515.0
Trade receivables, seasonal program maximum							240	75	200
Trade Receivable Agreement Expiration Date			Oct. 17, 2014	Mar. 10, 2015	Aug. 27, 2014
Net receivables transferred	$ 515.0	$ 265.1	$ 240.0	$ 75.0	$ 200.0

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Business Segment Information (Narrative) (Details)	3 Months Ended
	Mar. 31, 2014
Segment Reporting [Abstract]
Primary business segments	3
Number of counties in which electric service provided by Electric Operations	20

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Other Commitments And Contingencies

3 Months Ended

Mar. 31, 2014

Other Commitments and Contingencies [Abstract]

Commitments and Contingencies

Other Commitments and Contingencies

A.    Guarantees and Indemnities. As a part of normal business, NiSource and certain subsidiaries enter into various agreements providing financial or performance assurance to third parties on behalf of certain subsidiaries. Such agreements include guarantees and stand-by letters of credit. These agreements are entered into primarily to support or enhance the creditworthiness otherwise attributed to a subsidiary on a stand-alone basis, thereby facilitating the extension of sufficient credit to accomplish the subsidiaries’ intended commercial purposes. The total guarantees and indemnities in existence at March 31, 2014 and the years in which they expire were:

(in millions)	Total		2014		2015		2016		2017		2018		After
Guarantees of subsidiaries debt	$	7,710.5	$	500.0	$	230.0	$	616.5	$	507.0	$	800.0	$	5,057.0
Accounts receivable securitization	515.0		515.0		—		—		—		—		—
Lines of credit	297.5		297.5		—		—		—		—		—
Letters of credit	30.5		12.6		17.9		—		—		—		—
Other guarantees	142.4		45.4		35.3		—		—		—		61.7
Total commercial commitments	$	8,695.9	$	1,370.5	$	283.2	$	616.5	$	507.0	$	800.0	$	5,118.7

Guarantees of Subsidiaries Debt. NiSource has guaranteed the payment of $7.7 billion of debt for various wholly-owned subsidiaries including NiSource Finance and Columbia of Massachusetts, and through a support agreement, Capital Markets, which is reflected on NiSource’s Condensed Consolidated Balance Sheets (unaudited). The subsidiaries are required to comply with certain covenants under the debt indenture and in the event of default, NiSource would be obligated to pay the debt’s principal and related interest. NiSource does not anticipate its subsidiaries will have any difficulty maintaining compliance. On October 3, 2011, NiSource executed a Second Supplemental Indenture to the original Columbia of Massachusetts Indenture dated April 1, 1991, for the specific purpose of guaranteeing Columbia of Massachusetts’ outstanding medium-term notes.

Lines and Letters of Credit and Accounts Receivable Advances. On September 30, 2013, NiSource Finance amended its existing revolving credit facility with a syndicate of banks led by Barclays Capital to expand capacity to $2.0 billion and extend the termination date to September 28, 2018. The purpose of the facility is to fund ongoing working capital requirements including the provision of liquidity support for NiSource’s $1.5 billion commercial paper program, provide for the issuance of letters of credit, and also for general corporate purposes. At March 31, 2014, NiSource had no borrowings under its five-year revolving credit facility, $297.5 million in commercial paper outstanding and $515.0 million outstanding under its accounts receivable securitization agreements. At March 31, 2014, NiSource issued stand-by letters of credit of approximately $30.5 million for the benefit of third parties. See Note 15, “Short-Term Borrowings,” for additional information.

Other Guarantees or Obligations. NiSource has additional purchase and sales agreement guarantees totaling $73.5 million, which guarantee performance of the seller’s covenants, agreements, obligations, liabilities, representations and warranties under the agreements. No amounts related to the purchase and sales agreement guarantees are reflected in the Condensed Consolidated Balance Sheets (unaudited). Management believes that the likelihood NiSource would be required to perform or otherwise incur any significant losses associated with any of the aforementioned guarantees is remote.

NiSource has on deposit a letter of credit with Union Bank, N.A., Collateral Agent, in a debt service reserve account in association with Millennium's notes as required under the Deposit and Disbursement Agreement that governs the Millennium notes. This account is to be drawn upon by the note holders in the event that Millennium is delinquent on its principal and interest payments. The value of NiSource’s letter of credit represents 47.5% (NiSource’s ownership percentage in Millennium) of the debt service reserve account requirement, or $16.2 million. The total exposure for NiSource is $16.2 million. NiSource has an accrued liability of $1.5 million related to the inception date fair value of this guarantee as of March 31, 2014.

NiSource has issued other guarantees supporting derivative related payments associated with interest rate swap agreements issued by NiSource Finance, operating leases for many of its subsidiaries and for other agreements entered into by its current and former subsidiaries.

B.    Other Legal Proceedings. In the normal course of its business, NiSource and its subsidiaries have been named as defendants in various legal proceedings. In the opinion of management, the ultimate disposition of these currently asserted claims will not have a material impact on NiSource’s consolidated financial statements.

C.    Environmental Matters. NiSource operations are subject to environmental statutes and regulations related to air quality, water quality, hazardous waste and solid waste. NiSource believes that it is in substantial compliance with those environmental regulations currently applicable to its operations and believes that it has all necessary permits to conduct its operations.

It is management’s continued intent to address environmental issues in cooperation with regulatory authorities in such a manner as to achieve mutually acceptable compliance plans. However, there can be no assurance that fines and penalties will not be incurred. Management expects a significant portion of environmental assessment and remediation costs to be recoverable through rates for certain NiSource companies.

As of March 31, 2014 and December 31, 2013, NiSource had recorded an accrual of approximately $135.1 million and $143.9 million, respectively, to cover environmental remediation at various sites. The current portion of this accrual is included in "Legal and environmental" in the Condensed Consolidated Balance Sheets (unaudited). The noncurrent portion is included in "Other noncurrent liabilities" in the Condensed Consolidated Balance Sheets (unaudited). NiSource accrues for costs associated with environmental remediation obligations when the incurrence of such costs is probable and the amounts can be reasonably estimated. The original estimates for cleanup can differ materially from the amount ultimately expended. The actual future expenditures depend on many factors, including currently enacted laws and regulations, the nature and extent of contamination, the method of cleanup, and the availability of cost recovery from customers. These expenditures are not currently estimable at some sites. NiSource periodically adjusts its accrual as information is collected and estimates become more refined.

Air

The actions listed below could require further reductions in emissions from various emission sources. NiSource will continue to closely monitor developments in these matters.

Climate Change. Future legislative and regulatory programs could significantly restrict emissions of GHGs or could impose a cost or tax on GHG emissions.

In the first quarter of 2012, the EPA proposed an output-based carbon standard for new power plants. On September 20, 2013, the EPA announced withdrawal of the proposed standard and released a new proposal. The newly proposed standard would, for the first time, set national limits on the amount of carbon emissions allowed from new power plants. Compliance for new coal-fired plants may need to include capture and sequestration of carbon dioxide at coal-fired power plants. In addition, the EPA stated that it intends to regulate existing sources with a proposed rule in 2014.

If the EPA develops a GHG new source performance standard for existing units or if a federal or state comprehensive climate change bill were to be enacted into law, the impact on NiSource's financial performance would depend on a number of factors, including the overall level of required GHG reductions, the degree to which offsets may be used for compliance, and the amount of recovery allowed from customers. Comprehensive federal or state GHG regulation could result in additional expense or compliance costs that may not be fully recoverable from customers and could materially impact NiSource's financial results.

National Ambient Air Quality Standards. The CAA requires the EPA to set national air quality standards (the NAAQS) for particulate matter and five other pollutants considered harmful to public health and the environment. Periodically the EPA imposes new or modifies existing NAAQS. States that contain areas that do not meet the new or revised standards must take steps to maintain or achieve compliance with the standards. These steps could include additional pollution controls on boilers, engines, turbines, and other facilities owned by electric generation, gas distribution, and gas transmission operations.

The following NAAQS were recently added or modified:

Particulate Matter: In December 2009, the EPA issued area designations for the 2006 24-hour PM_2.5 standard, and several counties in which NiSource operates were designated as non-attainment. In addition, a final rule was promulgated in December 2012 that lowered the annual PM_2.5 standard from 15 to 12 µg/m³. NiSource will continue to monitor these matters and cannot estimate their impact at this time.

Ozone (eight hour): On September 2, 2011, the EPA announced it would implement its 2008 eight-hour ozone NAAQS rather than tightening the standard in 2012. The EPA will review, and possibly propose a new standard in 2014. In addition, the EPA has designated the Chicago metropolitan area, including the area in which NIPSCO operates one of its electric generation facilities, as non-attainment for ozone. NiSource will continue to monitor this matter and cannot estimate the impact of any new rules at this time.

Nitrogen Dioxide (NO₂): The EPA revised the NO₂ NAAQS by adding a one-hour standard while retaining the annual standard. The new standard could impact some NiSource combustion sources. The EPA designated all areas of the country as unclassifiable/attainment in January 2012. After the establishment of a new monitoring network and possible modeling implementation, areas will potentially be re-designated sometime in 2016. States with areas that do not meet the standard will be required to develop rules to bring areas into compliance within five years of designation. Additionally, under certain permitting circumstances emissions from some existing NiSource combustion sources may need to be assessed and mitigated. NiSource will continue to monitor this matter and cannot estimate the impact of these rules at this time.

Waste

NiSource subsidiaries are potentially responsible parties at waste disposal sites under the CERCLA (commonly known as Superfund) and similar state laws. Additionally, a program has been instituted to identify and investigate former MGP sites where Gas Distribution Operations subsidiaries or predecessors may have liability. The program has identified 67 such sites where liability is probable. Remedial actions at many of these sites are being overseen by state or federal environmental agencies through consent agreements or voluntary remediation agreements.

NiSource utilizes a probabilistic model to estimate its future remediation costs related to its MGP sites. The model was prepared with the assistance of a third party and incorporates NiSource and general industry experience with remediating MGP sites. NiSource completes an annual refresh of the model in the second quarter of each fiscal year. No material changes to the estimated liability were noted as a result of the refresh completed as of June 30, 2013. The total estimated liability at NiSource related to the facilities subject to remediation was $123.2 million and $129.5 million at March 31, 2014 and December 31, 2013, respectively. The liability represents NiSource’s best estimate of the probable cost to remediate the facilities. NiSource believes that it is reasonably possible that remediation costs could vary by as much as $25 million in addition to the costs noted above. Remediation costs are estimated based on the best available information, applicable remediation standards at the balance sheet date, and experience with similar facilities.

Additional Issues Related to Individual Business Segments

The sections below describe various regulatory actions that affect Columbia Pipeline Group Operations and Electric Operations.

Columbia Pipeline Group Operations.

Waste

Columbia Transmission continues to conduct characterization and remediation activities at specific sites under a 1995 AOC (subsequently modified in 1996 and 2007). NiSource utilizes a probabilistic model to estimate its future remediation costs related to the 1995 AOC. The model was prepared with the assistance of a third party and incorporates NiSource and general industry experience with remediating sites. NiSource completes an annual refresh of the model in the second quarter of each fiscal year. No material changes to the liability were noted as a result of the refresh completed as of June 30, 2013. The total remaining liability at Columbia Transmission related to the facilities subject to remediation was $6.4 million and $8.7 million at March 31, 2014 and December 31, 2013, respectively. The liability represents Columbia Transmission’s best estimate of the cost to remediate the facilities or manage the sites. Remediation costs are estimated based on the information available, applicable remediation standards, and experience with similar facilities. Columbia Transmission expects that the remediation for these facilities will be substantially completed in 2015.

Electric Operations.

Air

NIPSCO is subject to a number of new air-quality mandates in the next several years. These mandates require NIPSCO to make capital improvements to its electric generating stations. The cost of capital improvements is estimated to be $860 million, of which approximately $240.0 million remains to be spent. This figure includes additional capital improvements associated with the New Source Review Consent Decree and the Utility Mercury and Air Toxics Standards Rule. NIPSCO believes that the capital costs will likely be recoverable from ratepayers.

EPA Cross-State Air Pollution Rule / Clean Air Interstate Rule (CAIR) / Transport Rule: On July 6, 2011, the EPA announced its replacement for the 2005 CAIR to reduce the interstate transport of fine particulate matter and ozone. The CSAPR reduces overall emissions of SO₂ and NO_x by setting state-wide caps on power plant emissions. The CSAPR limits emissions, including NIPSCO's, and restricted emission allowance trading programs were scheduled to begin in 2012. In a decision issued on August 21, 2012 the D.C. Circuit Court vacated the CSAPR leaving the CAIR trading program provisions and requirements in place. The EPA subsequently petitioned for a writ of certiorari, and the United States Supreme Court granted this writ. Oral arguments were held on December 10, 2013, and a decision is expected in 2014. These developments do not significantly impact NIPSCO's current emissions control plans. NIPSCO utilizes the inventory model in accounting for emission allowances issued under the CAIR program whereby these allowances were recognized at zero cost upon receipt from the EPA. NIPSCO believes its current multi-pollutant compliance plan and New Source Review Consent Decree capital investments will allow NIPSCO to meet the emission requirements of CAIR, while a replacement for CSAPR is developed to address the court's decision.

Utility Mercury and Air Toxics Standards Rule: On December 16, 2011, the EPA finalized the MATS rule establishing new emissions limits for mercury and other air toxics. Compliance for NIPSCO’s affected units is required by April 2016. NIPSCO is implementing an IURC-approved plan for environmental controls to comply with MATS.

New Source Review:   On September 29, 2004, the EPA issued an NOV to NIPSCO for alleged violations of the CAA and the Indiana SIP. The NOV alleged that modifications were made to certain boiler units at three of NIPSCO's generating stations between the years 1985 and 1995 without obtaining appropriate air permits for the modifications. NIPSCO, the EPA, the Department of Justice, and IDEM have settled the matter through a consent decree, entered on July 22, 2011.

Water

The Phase II Rule of the Clean Water Act Section 316(b), which requires all large existing steam electric generating stations to meet certain performance standards to reduce the effects on aquatic organisms at their cooling water intake structures, became effective on September 7, 2004. Under this rule, stations will either have to demonstrate that the performance of their existing fish protection systems meet the new standards or develop new systems, such as a closed-cycle cooling tower. Various court challenges and EPA responses ensued. A final rule is expected to be issued in May 2014. NIPSCO will continue to monitor this matter but cannot estimate the cost of compliance at this time.

On June 7, 2013, the EPA published a proposed rule to amend the effluent limitations guidelines and standards for the Steam Electric Power Generating category. These proposed regulations could impose new water treatment requirements on NIPSCO’s electric generating facilities. NIPSCO will continue to monitor developments in this matter and cannot estimate the cost of compliance at this time.

Waste

On June 21, 2010, the EPA published a proposed rule for regulation of CCRs. The proposal outlines multiple regulatory approaches that the EPA is considering. These proposed regulations could negatively affect NIPSCO’s ongoing byproduct reuse programs and would impose additional requirements on its management of coal combustion residuals. NIPSCO will continue to monitor developments in this matter and cannot estimate the cost of compliance at this time.

D.     Other Matters. On November 23, 2012, while Columbia of Massachusetts was investigating the source of an odor of gas at a service location in Springfield, Massachusetts, a gas service line was pierced and an explosion occurred. While this explosion impacted multiple buildings and resulted in several injuries, no life threatening injuries or fatalities have been reported. Columbia of Massachusetts is fully cooperating with both the Massachusetts DPU and the Occupational Safety & Health Administration in their investigations of this incident. Columbia of Massachusetts believes any costs associated with damages, injuries, and other losses related to this incident are substantially covered by insurance. Any amounts not covered by insurance are not expected to have a material impact on NiSource's consolidated financial statements. In accordance with GAAP, NiSource recorded any accruals and the related insurance recoveries resulting from this incident on a gross basis within the Condensed Consolidated Balance Sheets (unaudited).

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Risk Management Activities (Location And Fair Value Of Derivative Instruments On Consolidated Balance Sheets) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Derivatives, Fair Value [Line Items]
Total Asset Derivatives	$ 14.4	$ 23.2
Designated As Hedging Instruments [Member]
Derivatives, Fair Value [Line Items]
Total Asset Derivatives	10.8	21.2
Designated As Hedging Instruments [Member] | Interest Rate Risk Activities [Member] | Price Risk Management Assets (Current) [Member]
Derivatives, Fair Value [Line Items]
Total Asset Derivatives	10.7	21.2
Designated As Hedging Instruments [Member] | Commodity Price Risk Programs [Member] | Price Risk Management Assets (Current) [Member]
Derivatives, Fair Value [Line Items]
Total Asset Derivatives	0.1	0
Not Designated as Hedging Instrument [Member]
Derivatives, Fair Value [Line Items]
Total Asset Derivatives	3.6	2.0
Not Designated as Hedging Instrument [Member] | Commodity Price Risk Programs [Member] | Price Risk Management Assets (Current) [Member]
Derivatives, Fair Value [Line Items]
Total Asset Derivatives	3.6	1.5
Not Designated as Hedging Instrument [Member] | Commodity Price Risk Programs [Member] | Price Risk Management Assets (Noncurrent) [Member]
Derivatives, Fair Value [Line Items]
Total Asset Derivatives	$ 0	$ 0.5

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Earnings Per Share Table (Details) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Earnings Per Share [Abstract]
Basic Average Common Shares Outstanding	314,222	311,120
Nonqualified stock options	59	156
Shares contingently issuable under employee stock plans	399	276
Shares restricted under stock plans	442	523
Weighted Average Number of Shares Outstanding, Diluted	315,122	312,075

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Short-Term Borrowings (Tables)

3 Months Ended

Mar. 31, 2014

Short-term Debt [Abstract]

Schedule Of Short-Term Borrowings

(in millions)	March 31, 2014		December 31, 2013
Commercial Paper weighted average interest rate of 0.55% and 0.70% at March 31, 2014 and December 31, 2013, respectively.	$	297.5	$	433.6
Accounts receivable securitization facility borrowings	515.0		265.1
Total short-term borrowings	$	812.5	$	698.7

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Risk Management Activities (The Effect Of Derivative Instruments Reclassified To Statements Of Consolidated Income) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014		Mar. 31, 2013
Cash Flow Hedging [Member]
Derivative Instruments Gain Loss [Line Items]
Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net	$ 0.1		$ 0.1
Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net, Total	(0.5)		(0.3)
Fair Value Hedging [Member]
Derivative Instruments Gain Loss [Line Items]
Amount of Gain (Loss) Recognized in Income on Derivatives	(10.4)		(9.7)
Amount of Gain (Loss) Recognized in Income on Related Hedged Items	10.4		9.7
Not Designated as Hedging Instrument [Member]
Derivative Instruments Gain Loss [Line Items]
Amount of Gain (Loss) Recognized in Income on Derivatives	6.9	[1]	(6.4)	[1]
Interest Expense [Member] | Cash Flow Hedging [Member]
Derivative Instruments Gain Loss [Line Items]
Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net, Total	(0.4)		(0.4)
Cost Of Sales [Member] | Cash Flow Hedging [Member]
Derivative Instruments Gain Loss [Line Items]
Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net, Total	(0.1)		0.1
Commodity Price Risk Programs [Member] | Cash Flow Hedging [Member]
Derivative Instruments Gain Loss [Line Items]
Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net	0.1		0.1
Commodity Price Risk Programs [Member] | Not Designated as Hedging Instrument [Member]
Derivative Instruments Gain Loss [Line Items]
Derivative Instruments Gain (Loss) Regulatory Deferred	6.9		(6.6)
Commodity Price Risk Programs [Member] | Gas Distribution Revenues [Member] | Not Designated as Hedging Instrument [Member]
Derivative Instruments Gain Loss [Line Items]
Amount of Gain (Loss) Recognized in Income on Derivatives	0	[1]	0.1	[1]
Commodity Price Risk Programs [Member] | Cost Of Sales [Member] | Not Designated as Hedging Instrument [Member]
Derivative Instruments Gain Loss [Line Items]
Amount of Gain (Loss) Recognized in Income on Derivatives	6.9	[1]	(6.7)	[1]
Commodity Price Risk Programs [Member] | (Loss) Income From Discontinued Operations [Member] | Not Designated as Hedging Instrument [Member]
Derivative Instruments Gain Loss [Line Items]
Amount of Gain (Loss) Recognized in Income on Derivatives	0	[1]	0.2	[1]
Interest Rate Risk Activities [Member] | Cash Flow Hedging [Member]
Derivative Instruments Gain Loss [Line Items]
Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net	0		0
Interest Rate Risk Activities [Member] | Interest Expense [Member] | Fair Value Hedging [Member]
Derivative Instruments Gain Loss [Line Items]
Amount of Gain (Loss) Recognized in Income on Derivatives	(10.4)		(9.7)
Fixed Rate Debt Hedges [Member] | Interest Expense [Member] | Fair Value Hedging [Member]
Derivative Instruments Gain Loss [Line Items]
Amount of Gain (Loss) Recognized in Income on Related Hedged Items	$ 10.4		$ 9.7

[1] For the amounts of realized/unrealized gain (loss) recognized in income on derivatives disclosed in the table above, gains of $6.9 million and $6.6 million for the three months ended March 31, 2014 and 2013, respectively, were deferred as allowed per regulatory orders. These amounts will be amortized to income over future periods of up to twelve months as specified in a regulatory order.

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Other Commitments And Contingencies (Narrative) (Details) (USD $)	9 Months Ended											3 Months Ended
	Sep. 30, 2013	Mar. 31, 2014	Dec. 31, 2013	Mar. 31, 2014 MGP Sites	Dec. 31, 2013 MGP Sites	Mar. 31, 2014 Columbia Transmission [Member]	Dec. 31, 2013 Columbia Transmission [Member]	Mar. 31, 2014 Millennium Pipeline Company, L.L.C [Member]	Mar. 31, 2014 Guarantees Of Subsidiaries Debt [Member]	Mar. 31, 2014 Letters Of Credit [Member]	Mar. 31, 2014 Other Guarantees [Member]	Mar. 31, 2014 Maximum [Member] NIPSCO [Member]	Mar. 31, 2014 Revolving Credit Facility [Member]	Mar. 31, 2014 Commercial Paper [Member]
Other Commitments And Contingencies [Line Items]
Remaining Payments for Capital Improvements												$ 240,000,000
Revolving credit facility, maximum	2,000,000,000												2,000,000,000	1,500,000,000
Line of Credit Facility, Expiration Date	Sep. 28, 2018
Line of Credit Facility, Amount Outstanding													0
Commercial paper		297,500,000	433,600,000											297,500,000
Accounts receivable securitization facility borrowings		515,000,000	265,100,000
Additional purchase and sales agreement guarantees		73,500,000
Percentage of interest in Millennium								47.50%
Guarantor Obligations, Maximum Exposure, Undiscounted		8,695,900,000						16,200,000	7,710,500,000	30,500,000	142,400,000
Fair value of guarantee obligations								1,500,000
Recorded reserves to cover environmental remediation at various sites		135,100,000	143,900,000
Number of waste disposal sites identified by program				67
Liability for Estimated Remediation Costs				123,200,000	129,500,000	6,400,000	8,700,000
Payments for Capital Improvements												860,000,000
Reasonably possible remediation costs variance from reserve				$ 25,000,000

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Pension And Other Postretirement Benefits (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	$ 0.7
Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	$ 9.2

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Regulatory Matters (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		2 Months Ended						12 Months Ended		0 Months Ended				4 Months Ended
	Mar. 31, 2014 Columbia Of Pennsylvania [Member]	Mar. 21, 2014 Columbia Of Pennsylvania [Member]	Feb. 18, 2014 Columbia Of Massachusetts [Member]	Feb. 28, 2014 Columbia Of Massachusetts [Member]	Dec. 16, 2013 Columbia Of Massachusetts [Member]	Oct. 16, 2013 Columbia Of Massachusetts [Member]	Sep. 03, 2013 Columbia Of Massachusetts [Member]	Apr. 16, 2013 Columbia Of Massachusetts [Member]	Dec. 31, 2013 Columbia Transmission [Member] Customer Settlement [Member]	Jan. 24, 2013 Columbia Transmission [Member] Customer Settlement [Member]	Nov. 12, 2013 NIPSCO [Member]	Jan. 31, 2014 NIPSCO [Member]	Oct. 03, 2013 NIPSCO [Member]	Jul. 19, 2013 NIPSCO [Member]	Apr. 23, 2014 Columbia Of Ohio [Member]	Nov. 25, 2013 Columbia Of Ohio [Member]
Regulatory Matters [Line Items]
Updated Cost Of Service						$ 30.0
Proposed Revenue Increase		54.1			29.9		29.5	30.1								25.5
Capital Investment Program Amount	180
Spend on Eligible Modernization Facilities									300
Approved Rate Increase (Decrease)				19.3											25.5
Projected Peak Undercollection			50
Deferred Recovery of Projected Peak Undercollection				25
Annual Capital Cost Recovery Mechanism Limit										300
Seven Year Plan of Eligible Investments Under TDSIC													710	1,100
Public Utilities, Approved Return on Equity, Percentage											12.38%
Reduced Return On Equity											9.15%
ECR 23 Net Capital Expenditures												$ 583.5

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Basis of Accounting Presentation

3 Months Ended

Mar. 31, 2014

Organization, Consolidation and Presentation of Financial Statements [Abstract]

Basis of Accounting Presentation

Basis of Accounting Presentation

The accompanying Condensed Consolidated Financial Statements (unaudited) for NiSource (the “Company”) reflect all normal recurring adjustments that are necessary, in the opinion of management, to present fairly the results of operations in accordance with GAAP in the United States of America.

The accompanying financial statements should be read in conjunction with the consolidated financial statements and notes thereto included in NiSource’s Annual Report on Form 10-K for the fiscal year ended December 31, 2013. Income for interim periods may not be indicative of results for the calendar year due to weather variations and other factors.

The Condensed Consolidated Financial Statements (unaudited) have been prepared pursuant to the rules and regulations of the SEC. Certain information and note disclosures normally included in annual financial statements prepared in accordance with GAAP have been condensed or omitted pursuant to those rules and regulations, although NiSource believes that the disclosures made are adequate to make the information not misleading.

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Pension And Other Postretirement Benefits (Components Of The Plans' Net Periodic Benefits Cost) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Service Cost	$ 8.7	$ 9.4
Interest cost	27.3	24.3
Expected return on assets	(45.3)	(42.4)
Amortization of transition obligation	0	0
Amortization of prior service cost (credit)	0	0.1
Recognized actuarial loss	11.9	20.7
Settlement loss	0	20.7
Total Net Periodic Benefits Cost	2.6	32.8
Other Postretirement Benefits [Member]
Defined Benefit Plan Disclosure [Line Items]
Service Cost	2.3	3.0
Interest cost	8.2	8.1
Expected return on assets	(9.1)	(7.6)
Amortization of transition obligation	0	0.1
Amortization of prior service cost (credit)	(0.6)	(0.2)
Recognized actuarial loss	0	2.8
Settlement loss	0	0
Total Net Periodic Benefits Cost	$ 0.8	$ 6.2

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Gas In Storage (Narrative) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Gas in Storage [Abstract]
LIFO Inventory Amount	$ 10.3	$ 0

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Risk Management Activities (Policy)

3 Months Ended

Mar. 31, 2014

Accounting Policies [Abstract]

Derivatives Policy

Accounting Policy for Derivative Instruments.    Unrealized and realized gains and losses are recognized each period as components of AOCI, regulatory assets and liabilities or earnings depending on the designation of the derivative instrument and regulatory accounting treatment. For subsidiaries that utilize derivatives for cash flow hedges, the effective portions of the gains and losses are recorded to AOCI and are recognized in earnings concurrent with the disposition of the hedged risks. If a forecasted transaction corresponding to a cash flow hedge is no longer probable to occur, the accumulated gains or losses on the derivative are recognized currently in earnings. For fair value hedges, the gains and losses are recorded in earnings each period together with the change in the fair value of the hedged item. As a result of the rate-making process, the rate-regulated subsidiaries generally record gains and losses as regulatory liabilities or assets and recognize such gains or losses in earnings when both the contracts settle and the physical commodity flows. These gains and losses recognized in earnings are then subsequently recovered or passed back to customers in revenues through rates. When gains and losses are recognized in earnings, they are recognized in revenues or cost of sales for derivatives that correspond to commodity risk activities and are recognized in interest expense for derivatives that correspond to interest-rate risk activities.

For its commodity price risk programs, NiSource has elected not to net the fair value amounts of its derivative instruments or the fair value amounts recognized for its right to receive or obligation to pay cash collateral arising from those derivative instruments recognized at fair value, which are executed with the same counterparty under a master netting arrangement. NiSource discloses amounts recognized for the right to reclaim cash collateral within “Restricted cash” and amounts recognized for the obligation to return cash collateral within “Other accruals” on the Condensed Consolidated Balance Sheets (unaudited).

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Supplemental Cash Flow Information

3 Months Ended

Mar. 31, 2014

Supplemental Cash Flow Information [Abstract]

Supplemental Cash Flow Information

Supplemental Cash Flow Information

The following table provides additional information regarding NiSource’s Condensed Statements of Consolidated Cash Flows (unaudited) for the three months ended March 31, 2014 and 2013:

	Three Months Ended March 31,
(in millions)	2014		2013
Supplemental Disclosures of Cash Flow Information
Non-cash transactions:
Capital expenditures included in current liabilities	$	131.4	$	114.3
Assets acquired under a capital lease	51.6		2.1
Schedule of interest and income taxes paid:
Cash paid for interest, net of interest capitalized amounts	$	167.7	$	161.8
Cash paid for income taxes	6.8		2.9

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Fair Value (Carrying Amount And Estimated Fair Values Of Financial Instruments) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-term debt (including current portion), Carrying Amount	$ 8,169.0	$ 8,135.3
Long-term debt (including current portion), Estimated Fair Value	$ 8,944.1	$ 8,697.3

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Discontinued Operations and Assets and Liabilities Held for Sale (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Sep. 30, 2013 Unregulated Natural Gas Marketing Business [Member]	Mar. 31, 2013 Service Plan And Leasing Business Lines of Retail Services Business [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Discontinued Operation, Gain (Loss) on Disposal of Discontinued Operation, Net of Tax	$ 0	$ 36.4	$ (1.5)	$ 36.4

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Earnings Per Share (Tables)

3 Months Ended

Mar. 31, 2014

Earnings Per Share [Abstract]

Computation Of Diluted Average Common Shares

	Three Months Ended
	March 31,
(in thousands)	2014	2013
Denominator
Basic average common shares outstanding	314,222	311,120
Dilutive potential common shares:
Stock options	59	156
Shares contingently issuable under employee stock plans	399	276
Shares restricted under stock plans	442	523
Diluted Average Common Shares	315,122	312,075

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Discontinued Operations And Assets And Liabilities Held For Sale (Tables)

3 Months Ended

Mar. 31, 2014

Discontinued Operations And Assets And Liabilities Held For Sale [Abstract]

Assets And Liabilities Of Discontinued Operations And Held For Sale

	Three Months Ended March 31,
(in millions)	2014			2013
Revenues from Discontinued Operations	$	—		$	16.2
(Loss) Income from discontinued operations	(0.3		)	13.2
Income tax (benefit) expense	(0.1		)	5.1
(Loss) Income from Discontinued Operations - net of taxes	$	(0.2	)	$	8.1
Gain on Disposition of Discontinued Operations - net of taxes	$	—		$	36.4

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Statements Of Consolidated Common Stockholders' Equity (USD $) In Millions	Total	Common Stock [Member]	Treasury Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Income (Loss) [Member]
Beginning Balance at Dec. 31, 2013	$ 5,886.6	$ 3.2	$ (48.6)	$ 4,690.1	$ 1,285.5	$ (43.6)
Net Income	266.2	0	0	0	266.2	0
Other comprehensive income, net of tax	1.1	0	0	0	0	1.1
Common stock dividends	(157.3)	0	0	0	(157.3)	0
Treasury stock acquired	(10.0)	0	(10.0)	0	0	0
Employee stock purchase plan	0.8	0	0	0.8	0	0
Long-term incentive plan	8.4	0	0	8.4	0	0
401(k) and profit sharing issuance	14.3	0	0	14.3	0	0
Dividend reinvestment plan	2.0	0	0	2.0	0	0
Ending Balance at Mar. 31, 2014	$ 6,012.1	$ 3.2	$ (58.6)	$ 4,715.6	$ 1,394.4	$ (42.5)

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Asset Retirement Obligations (Tables)

3 Months Ended

Mar. 31, 2014

Asset Retirement Obligation [Abstract]

Changes In Company's Liability For Asset Retirement Obligations

(in millions)	2014			2013
Balance as of January 1,	$	174.4		$	160.4
Accretion expense	0.4			0.3
Accretion recorded as a regulatory asset/liability	2.1			2.3
Additions	0.1			2.9
Settlements	(0.5		)	(0.3		)
Change in estimated cash flows	—			(0.3		)
Balance as of March 31,	$	176.5		$	165.3

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Business Segment Information (Tables)

3 Months Ended

Mar. 31, 2014

Segment Reporting [Abstract]

Schedule Of Operating Income Derived From Revenues And Expenses By Segment

	Three Months Ended March 31,
(in millions)	2014			2013
REVENUES
Gas Distribution Operations
Unaffiliated	$	1,565.4		$	1,144.9
Intersegment	0.2			0.2
Total	1,565.6			1,145.1
Columbia Pipeline Group Operations
Unaffiliated	303.2			258.4
Intersegment	42.4			43.0
Total	345.6			301.4
Electric Operations
Unaffiliated	450.2			377.4
Intersegment	0.2			0.2
Total	450.4			377.6
Corporate and Other
Unaffiliated	1.7			1.5
Intersegment	126.8			121.7
Total	128.5			123.2
Eliminations	(169.6		)	(165.1		)
Consolidated Gross Revenues	$	2,320.5		$	1,782.2
Operating Income (Loss)
Gas Distribution Operations	$	301.8		$	234.1
Columbia Pipeline Group Operations	158.9			133.5
Electric Operations	78.9			65.2
Corporate and Other	(5.9		)	(3.9		)
Consolidated Operating Income	$	533.7		$	428.9

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Fair Value (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Fair Value Disclosure [Line Items]
Disposal Group, Including Discontinued Operation, Goodwill		$ 11.0
Government [Member]
Fair Value Disclosure [Line Items]
Available-for-sale Securities, Gross Realized Gain (Loss)	0.1	0.2
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Fair Value	2.6
Corporate/Other Bonds [Member]
Fair Value Disclosure [Line Items]
Available-for-sale Securities, Gross Realized Gain (Loss)	0.1	0.2
Available-for-sale Securities, Debt Maturities, Next Twelve Months, Fair Value	$ 4.4

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Business Segment Information (Schedule Of Operating Income Derived From Revenues And Expenses By Segment) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Segment Reporting Information [Line Items]
Revenues	$ 2,320.5	$ 1,782.2
Consolidated Operating Income (Loss)	533.7	428.9
Gas Distribution Operations [Member]
Segment Reporting Information [Line Items]
Revenues	1,565.6	1,145.1
Consolidated Operating Income (Loss)	301.8	234.1
Gas Distribution Operations [Member] | Unaffiliated [Member]
Segment Reporting Information [Line Items]
Revenues	1,565.4	1,144.9
Gas Distribution Operations [Member] | Intersegment [Member]
Segment Reporting Information [Line Items]
Revenues	0.2	0.2
Columbia Pipeline Group Operations [Member]
Segment Reporting Information [Line Items]
Revenues	345.6	301.4
Consolidated Operating Income (Loss)	158.9	133.5
Columbia Pipeline Group Operations [Member] | Unaffiliated [Member]
Segment Reporting Information [Line Items]
Revenues	303.2	258.4
Columbia Pipeline Group Operations [Member] | Intersegment [Member]
Segment Reporting Information [Line Items]
Revenues	42.4	43.0
Electric Operations [Member]
Segment Reporting Information [Line Items]
Revenues	450.4	377.6
Consolidated Operating Income (Loss)	78.9	65.2
Electric Operations [Member] | Unaffiliated [Member]
Segment Reporting Information [Line Items]
Revenues	450.2	377.4
Electric Operations [Member] | Intersegment [Member]
Segment Reporting Information [Line Items]
Revenues	0.2	0.2
Corporate and Other [Member]
Segment Reporting Information [Line Items]
Revenues	128.5	123.2
Consolidated Operating Income (Loss)	(5.9)	(3.9)
Corporate and Other [Member] | Unaffiliated [Member]
Segment Reporting Information [Line Items]
Revenues	1.7	1.5
Corporate and Other [Member] | Intersegment [Member]
Segment Reporting Information [Line Items]
Revenues	126.8	121.7
Eliminations [Member]
Segment Reporting Information [Line Items]
Revenues	$ (169.6)	$ (165.1)

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Statements Of Consolidated Income (USD $) In Millions, except Share data in Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Net Revenues
Gas Distribution	$ 1,215.0	$ 892.2
Gas Transportation and Storage	578.5	468.5
Electric	450.0	377.3
Other	77.0	44.2
Gross Revenues	2,320.5	1,782.2
Cost of Sales (excluding depreciation and amortization)	1,061.3	676.0
Total Net Revenues	1,259.2	1,106.2
Operating Expenses
Operation and maintenance	501.2	454.3
Depreciation and amortization	148.7	143.6
Gain on sale of assets, net	(15.7)	(0.2)
Other taxes	101.1	86.7
Total Operating Expenses	735.3	684.4
Equity Earnings in Unconsolidated Affiliates	9.8	7.1
Operating Income	533.7	428.9
Other Income (Deductions)
Interest expense, net	(109.1)	(98.6)
Other, net	4.5	4.1
Total Other Deductions	(104.6)	(94.5)
Income from Continuing Operations before Income Taxes	429.1	334.4
Income Taxes	162.7	118.4
Income from Continuing Operations	266.4	216.0
(Loss) Income from Discontinued Operations - net of taxes	(0.2)	8.1
Gain on Disposition of Discontinued Operations - net of taxes	0	36.4
Net Income	$ 266.2	$ 260.5
Basic Earnings (Loss) Per Share ($)
Continuing Operations	$ 0.85	$ 0.69
Discontinued operations	$ 0.00	$ 0.15
Basic Earnings Per Share	$ 0.85	$ 0.84
Diluted Earnings (Loss) Per Share ($)
Continuing operations	$ 0.85	$ 0.69
Discontinued operations	$ 0.00	$ 0.14
Earnings Per Share, Diluted	$ 0.85	$ 0.83
Dividends Declared Per Common Share	$ 0.50	$ 0.48
Basic Average Common Shares Outstanding	314,222	311,120
Diluted Average Common Shares	315,122	312,075

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Discontinued Operations And Assets And Liabilities Held For Sale (Summary Of Gain (Loss) On Disposition Of Discontinued Operations Net Of Taxes) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Discontinued Operations And Assets And Liabilities Held For Sale [Abstract]
Revenues from Discontinued Operations	$ 0	$ 16.2
(Loss) Income from discontinued operations	(0.3)	13.2
Income tax (benefit) expense	(0.1)	5.1
(Loss) Income from Discontinued Operations - net of taxes	(0.2)	8.1
Gain on Disposition of Discontinued Operations - net of taxes	$ 0	$ 36.4

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Statements of Consolidated Balance Sheets (Parenthetical) (USD $) In Millions, except Share data, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Statement of Financial Position [Abstract]
Accounts receivable less reserve	$ 34.6	$ 23.5
Common stock, par value	$ 0.01	$ 0.01
Common stock, shares authorized	400,000,000	400,000,000
Common Stock, Shares, Outstanding	314,800,122	313,675,911

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Goodwill (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013
Goodwill And Other Intangible Assets [Line Items]
Disposal Group, Including Discontinued Operation, Goodwill	$ 11.0
Columbia Distribution [Member]
Goodwill And Other Intangible Assets [Line Items]
Disposal Group, Including Discontinued Operation, Goodwill	10.0
NIPSCO Gas Distribution [Member]
Goodwill And Other Intangible Assets [Line Items]
Disposal Group, Including Discontinued Operation, Goodwill	$ 1.0

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Transfers Of Financial Assets (Tables)

3 Months Ended

Mar. 31, 2014

Transfers and Servicing [Abstract]

Schedule Of Gross And Net Receivables Transferred As Well As Short-Term Borrowings Related To The Securitization Transactions

(in millions)	March 31, 2014		December 31, 2013
Gross Receivables	$	811.7	$	610.9
Less: Receivables not transferred	296.7		345.8
Net receivables transferred	$	515.0	$	265.1
Short-term debt due to asset securitization	$	515.0	$	265.1

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Short-Term Borrowings (Schedule Of Short-Term Borrowings) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Short-term Debt [Line Items]
Commercial paper	$ 297.5	$ 433.6
Accounts receivable securitization facility borrowings	515.0	265.1
Total short-term borrowings	812.5	698.7
Commercial Paper [Member]
Short-term Debt [Line Items]
Commercial paper	$ 297.5
Commercial Paper/credit facilities borrowings, weighted average interest rate	0.55%	0.70%

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Variable Interests and Variable Interest Entities

3 Months Ended

Mar. 31, 2014

Variable Interest Entities And Equity Investments [Abstract]

Variable Interests and Variable Interest Entities

Variable Interests and Variable Interest Entities

In general, a VIE is an entity that (1) has an insufficient amount of at-risk equity to permit the entity to finance its activities without additional financial subordinated support provided by any parties, (2) whose at-risk equity owners, as a group, do not have power, through voting rights or similar rights, to direct activities of the entity that most significantly impact the entity’s economic performance or (3) whose at-risk owners do not absorb the entity’s losses or receive the entity’s residual return. A VIE is required to be consolidated by a company if that company is determined to be the primary beneficiary of the VIE.

NiSource consolidates those VIEs for which it is the primary beneficiary. NiSource considers quantitative and qualitative elements in determining the primary beneficiary. Qualitative measures include the ability to control an entity and the obligation to absorb losses or the right to receive benefits.

NiSource’s analysis includes an assessment of guarantees, operating leases, purchase agreements, and other contracts, as well as its investments and joint ventures. For items that have been identified as variable interests, or where there is involvement with an identified VIE, an in-depth review of the relationship between the relevant entities and NiSource is made to evaluate qualitative and quantitative factors to determine the primary beneficiary, if any, and whether additional disclosures would be required under the current standard.

NIPSCO has a service agreement with Pure Air, a general partnership between Air Products and Chemicals, Inc. and First Air Partners LP, under which Pure Air provides scrubber services to reduce sulfur dioxide emissions for Units 7 and 8 at the Bailly Generating Station. NiSource has made an exhaustive effort to obtain information needed from Pure Air to determine the status of Pure Air as a VIE. However, NIPSCO has not been able to obtain this information and as a result, it is unclear whether Pure Air is a VIE and if NIPSCO is the primary beneficiary. NIPSCO will continue to request the information required to determine whether Pure Air is a VIE. NIPSCO has no exposure to loss related to the service agreement with Pure Air and payments under this agreement were $5.4 million and $5.6 million for the three months ended March 31, 2014 and 2013, respectively.

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Pension And Other Postretirement Benefits (Tables)

3 Months Ended

Mar. 31, 2014

Pension and Other Postretirement Benefit Expense [Abstract]

Components Of The Plans' Net Periodic Benefits Cost

	Pension Benefits						Other Postretirement Benefits
Three Months Ended March 31, (in millions)	2014			2013			2014			2013
Components of Net Periodic Benefit Cost
Service cost	$	8.7		$	9.4		$	2.3		$	3.0
Interest cost	27.3			24.3			8.2			8.1
Expected return on assets	(45.3		)	(42.4		)	(9.1		)	(7.6		)
Amortization of transition obligation	—			—			—			0.1
Amortization of prior service cost (credit)	—			0.1			(0.6		)	(0.2		)
Recognized actuarial loss	11.9			20.7			—			2.8
Settlement loss	—			20.7			—			—
Total Net Periodic Benefit Costs	$	2.6		$	32.8		$	0.8		$	6.2

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Share-Based Compensation

3 Months Ended

Mar. 31, 2014

Share-based Compensation [Abstract]

Share-Based Compensation

Share-Based Compensation

The stockholders approved and adopted the NiSource Inc. 2010 Omnibus Incentive Plan (the “Omnibus Plan”), at the Annual Meeting of Stockholders held on May 11, 2010. The Omnibus Plan provides for awards to employees and non-employee directors of incentive and nonqualified stock options, stock appreciation rights, restricted stock and restricted stock units, performance shares, performance units, cash-based awards and other stock-based awards. The Omnibus Plan provides that the number of shares of common stock of NiSource available for awards is 8,000,000 plus the number of shares subject to outstanding awards granted under either the 1994 Plan or the Director Plan (described below) that expire or terminate for any reason. No further awards are permitted to be granted under the 1994 Plan or the Director Plan. At March 31, 2014, there were 6,162,981 shares reserved for future awards under the Omnibus Plan.

Prior to May 11, 2010, NiSource issued long-term equity incentive grants to key management employees under a long-term incentive plan approved by stockholders on April 13, 1994 (“1994 Plan”). The types of equity awards previously authorized under the 1994 Plan did not significantly differ from those permitted under the Omnibus Plan.

NiSource recognized stock-based employee compensation expense of $5.3 million and $4.2 million for the three months ended March 31, 2014 and 2013, respectively, as well as related tax benefits of $2.0 million and $1.5 million, respectively.

As of March 31, 2014, the total remaining unrecognized compensation cost related to nonvested awards amounted to $31.8 million, which will be amortized over the weighted-average remaining requisite service period of 2.3 years.

Stock Options. As of March 31, 2014, approximately 0.2 million options were outstanding and exercisable with a weighted average strike price of $22.62. No options were granted during the three months endedMarch 31, 2014 and 2013. As of March 31, 2014, the aggregate intrinsic value for the options outstanding and exercisable was $3.1 million. During the three months ended March 31, 2014 and 2013, cash received from the exercise of options was $3.9 million and $13.1 million, respectively.

Restricted Stock Units and Restricted Stock. During the three months endedMarch 31, 2014, NiSource granted 67,594 restricted stock units and shares of restricted stock, subject to service conditions. The total grant date fair value of restricted stock units and shares of restricted stock was $2.1 million, based on the average market price of NiSource’s common stock at the date of each grant less the present value of any dividends not received during the vesting period, which will be expensed, net of forfeitures, over the vesting period which is generally three years. If the employee terminates employment before the service conditions lapse due to (1) Retirement or Disability (as defined in the award agreement), or (2) death, the employment conditions will lapse with respect to a pro rata portion of the shares of restricted stock and restricted stock units on the date of termination. In the event of a Change-in-Control (as defined in the award agreement), all unvested shares of restricted stock and restricted stock units granted during the three months ended March 31, 2014 will vest upon termination of employment in connection with a Change-in-Control. Termination due to any other reason will result in all unvested shares of restricted stock and restricted stock units awarded being forfeited effective on the employee’s date of termination. As of March 31, 2014, 324,585 nonvested (all of which are expected to vest) restricted stock units and shares of restricted stock were granted and outstanding.

Performance Shares. During the three months endedMarch 31, 2014, NiSource granted 525,173 performance shares subject to service and performance conditions. The grant date fair value of the awards was $16.3 million, based on the average market price of NiSource’s common stock at the date of each grant less the present value of dividends not received during the vesting period which will be expensed, net of forfeitures, over the three year requisite service period. The performance conditions are based on achievement of cumulative net operating earnings per share, a non-GAAP financial measure that NiSource defines as income from continuing operations adjusted for certain items; and relative total shareholder return, a non-GAAP market measure that NiSource defines as the annualized growth in the dividends and share price of a share of NiSource’s common stock (calculated using a 20 trading day average of NiSource’s closing price, over a period beginning December 31, 2013 and ending on December 31, 2016) compared to the total shareholder return performance of a predetermined peer group of companies. The service conditions lapse on February 28, 2017 when the shares vest provided the performance criteria are satisfied. In general, if the employee terminates employment before February 28, 2017 due to (1) Retirement or Disability (as defined in the award agreement), or (2) death, the employment conditions will lapse with respect to a pro rata portion of the performance shares payable at target on the date of termination provided the performance criteria are met. In the event of a Change-in-Control (as defined in the award agreement), all unvested performance shares will immediately vest. Termination due to any other reason will result in all performance shares awarded being forfeited effective on the employee’s date of termination. As of March 31, 2014, 1,878,558 nonvested performance shares were granted and outstanding.

Non-employee Director Awards. As of May 11, 2010, awards to non-employee directors may be made only under the Omnibus Plan. Currently, restricted stock units are granted annually to non-employee directors, subject to a non-employee director’s election to defer receipt of such restricted stock unit award. The non-employee director’s restricted stock units vest on the last day of the non-employee director’s annual term corresponding to the year the restricted stock units were awarded subject to special pro-rata vesting rules in the event of Retirement or Disability (as defined in the award agreement), or death. The vested restricted stock units are payable as soon as practicable following vesting except as otherwise provided pursuant to the non-employee director’s election to defer. As of March 31, 2014, 144,578 restricted stock units were outstanding to non-employee directors under the Omnibus Plan.

Only restricted stock units remain outstanding under the prior plan for non-employee directors, the Amended and Restated Non-employee Director Stock Incentive Plan (the “Director Plan”). All such awards are fully vested and shall be distributed to the directors upon their separation from the Board. As of March 31, 2014, 147,845 restricted stock units remained outstanding under the Director Plan and as noted above no further shares may be awarded under the Director Plan.

401(k) Match, Profit Sharing and Company Contribution. NiSource has a voluntary 401(k) savings plan covering eligible employees that allows for periodic discretionary matches as a percentage of each participant’s contributions payable in shares of common stock. NiSource also has a retirement savings plan that provides for discretionary profit sharing contributions payable in shares of common stock to eligible employees based on earnings results; and eligible exempt employees hired after January 1, 2010, receive a non-elective company contribution of three percent of eligible pay payable in shares of common stock. For the quarters ended March 31, 2014 and 2013, NiSource recognized 401(k) match, profit sharing and non-elective contribution expense of $8.5 million and $6.4 million, respectively.

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Other Commitments And Contingencies (Existence And Expiration Of Commercial Commitments) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014
Other Commitments And Contingencies [Line Items]
Guarantee Obligations Maximum Exposure Year One	$ 1,370.5
Guarantee Obligations Maximum Exposure Year Two	283.2
Guarantee Obligations Maximum Exposure Year Three	616.5
Guarantee Obligations Maximum Exposure Year Four	507.0
Guarantee Obligations Maximum Exposure Year Five	800.0
Guarantee Obligations Maximum Exposure Thereafter	5,118.7
Guarantor Obligations, Maximum Exposure, Undiscounted	8,695.9
Subsidiaries Debt [Member]
Other Commitments And Contingencies [Line Items]
Guarantee Obligations Maximum Exposure Year One	500.0
Guarantee Obligations Maximum Exposure Year Two	230.0
Guarantee Obligations Maximum Exposure Year Three	616.5
Guarantee Obligations Maximum Exposure Year Four	507.0
Guarantee Obligations Maximum Exposure Year Five	800.0
Guarantee Obligations Maximum Exposure Thereafter	5,057.0
Guarantor Obligations, Maximum Exposure, Undiscounted	7,710.5
Letters Of Credit [Member]
Other Commitments And Contingencies [Line Items]
Guarantee Obligations Maximum Exposure Year One	12.6
Guarantee Obligations Maximum Exposure Year Two	17.9
Guarantee Obligations Maximum Exposure Year Three	0
Guarantee Obligations Maximum Exposure Year Four	0
Guarantee Obligations Maximum Exposure Year Five	0
Guarantee Obligations Maximum Exposure Thereafter	0
Guarantor Obligations, Maximum Exposure, Undiscounted	30.5
Accounts Receivable Securitization [Member]
Other Commitments And Contingencies [Line Items]
Guarantee Obligations Maximum Exposure Year One	515.0
Guarantee Obligations Maximum Exposure Year Two	0
Guarantee Obligations Maximum Exposure Year Three	0
Guarantee Obligations Maximum Exposure Year Four	0
Guarantee Obligations Maximum Exposure Year Five	0
Guarantee Obligations Maximum Exposure Thereafter	0
Guarantor Obligations, Maximum Exposure, Undiscounted	515.0
Lines Of Credit [Member]
Other Commitments And Contingencies [Line Items]
Guarantee Obligations Maximum Exposure Year One	297.5
Guarantee Obligations Maximum Exposure Year Two	0
Guarantee Obligations Maximum Exposure Year Three	0
Guarantee Obligations Maximum Exposure Year Four	0
Guarantee Obligations Maximum Exposure Year Five	0
Guarantee Obligations Maximum Exposure Thereafter	0
Guarantor Obligations, Maximum Exposure, Undiscounted	297.5
Other Guarantees [Member]
Other Commitments And Contingencies [Line Items]
Guarantee Obligations Maximum Exposure Year One	45.4
Guarantee Obligations Maximum Exposure Year Two	35.3
Guarantee Obligations Maximum Exposure Year Three	0
Guarantee Obligations Maximum Exposure Year Four	0
Guarantee Obligations Maximum Exposure Year Five	0
Guarantee Obligations Maximum Exposure Thereafter	61.7
Guarantor Obligations, Maximum Exposure, Undiscounted	$ 142.4

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Statements Of Consolidated Cash Flows (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Operating Activities
Net Income	$ 266.2	$ 260.5
Adjustments to Reconcile Net Income to Net Cash from Continuing Operations:
Depreciation and amortization	148.7	143.6
Net changes in price risk management assets and liabilities	0.8	0.5
Deferred income taxes and investment tax credits	148.9	117.1
Deferred revenue	1.8	(0.4)
Stock compensation expense and 401(k) profit sharing contribution	13.9	10.6
Gain on sale of assets	(15.7)	(0.2)
Income from unconsolidated affiliates	(9.6)	(7.3)
Gain on disposition of discontinued operations - net of taxes	0	(36.4)
Loss (Income) from discontinued operations - net of taxes	0.2	(8.1)
Amortization of debt related costs	2.4	2.3
AFUDC equity	(4.0)	(3.5)
Distributions of earnings received from equity investees	7.6	7.0
Changes in Assets and Liabilities:
Accounts receivable	(265.1)	(161.4)
Income tax receivable	0.9	50.4
Inventories	274.0	254.7
Accounts payable	126.5	25.4
Customer deposits and credits	(23.1)	(102.0)
Taxes accrued	19.3	28.1
Interest accrued	(61.1)	(65.5)
(Under)Overrecovered gas and fuel costs	(74.2)	69.3
Exchange gas receivable/payable	(134.2)	(89.8)
Other accruals	(30.1)	(26.6)
Prepayments and other current assets	4.5	(5.8)
Regulatory assets/liabilities	2.9	5.8
Postretirement and postemployment benefits	(19.3)	(36.8)
Deferred credits	8.4	7.7
Deferred charges and other noncurrent assets	(0.2)	(0.4)
Other noncurrent liabilities	4.0	(2.0)
Net Operating Activities from Continuing Operations	394.4	436.8
Net Operating Activities (used for) from Discontinued Operations	(0.4)	12.3
Net Cash Flows from Operating Activities	394.0	449.1
Investing Activities
Capital expenditures	(386.3)	(369.3)
Proceeds from disposition of assets	5.3	0.5
Restricted cash (deposits) withdrawals	(2.9)	23.6
Contributions to equity investees	(31.0)	(17.1)
Other investing activities	7.0	(5.3)
Net Investing Activities used for Continuing Operations	(407.9)	(367.6)
Net Investing Activities from Discontinued Operations	0	121.5
Net Cash Flows used for Investing Activities	(407.9)	(246.1)
Financing Activities
Repayments of long-term debt and capital lease obligations	9.1	427.1
Change in short-term borrowings, net	113.8	354.3
Issuance of common stock	8.9	17.2
Acquisition of treasury stock	(10.0)	(7.6)
Dividends paid - common stock	(78.5)	(74.7)
Net Cash Flows from (used for) Financing Activities	25.1	(137.9)
Change in cash and cash equivalents from (used for) continuing operations	11.6	(68.7)
Cash contributions (to) from discontinued operations	(0.4)	133.8
Cash and cash equivalents at beginning of period	26.8	36.3
Cash and Cash Equivalents at End of Period	$ 38.0	$ 101.4

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Statements of Consolidated Comprehensive Income (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014		Mar. 31, 2013
Net Income	$ 266.2		$ 260.5
Net unrealized (loss) gain on available-for-sale securities	0.3	[1]	(0.4)	[1]
Net unrealized gain on cash flow hedges	0.6	[2]	0.9	[2]
Unrecognized pension benefit and OPEB benefit	0.2	[3]	2.7	[3]
Total other comprehensive income	1.1		3.2
Total Comprehensive Income	$ 267.3		$ 263.7

[1] Net unrealized gain (loss) on available-for-sale securities, net of $0.2 million tax expense and $0.1 million tax benefit in the first quarter of 2014 and 2013, respectively

[2] Net unrealized gains on derivatives qualifying as cash flow hedges, net of $0.4 million and $0.6 million tax expense in the first quarter of 2014 and 2013, respectively

[3] Unrecognized pension benefit and OPEB benefit, net of zero and $1.7 million tax expense in the first quarter of 2014 and 2013, respectively

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Fair Value

3 Months Ended

Mar. 31, 2014

Fair Value Disclosures [Abstract]

Fair Value

Fair Value

A.    Fair Value Measurements

Recurring Fair Value Measurements. The following tables present financial assets and liabilities measured and recorded at fair value on NiSource’s Condensed Consolidated Balance Sheets (unaudited) on a recurring basis and their level within the fair value hierarchy as of March 31, 2014 and December 31, 2013:

Recurring Fair Value Measurements March 31, 2014 (in millions)	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Balance as of March 31, 2014
Assets
Commodity price risk management assets:
Financial price risk programs	$	3.7	$	—	$	—	$	3.7
Interest rate risk activities	—		10.7		—		10.7
Available-for-sale securities	24.2		95.9		—		120.1
Total	$	27.9	$	106.6	$	—	$	134.5
Liabilities
Commodity price risk management liabilities:
Financial price risk programs	$	0.1	$	—	$	0.3	$	0.4
Total	$	0.1	$	—	$	0.3	$	0.4

Recurring Fair Value Measurements December 31, 2013 (in millions)	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Balance as of December 31, 2013
Assets
Commodity price risk management assets:
Financial price risk programs	$	2.1	$	—	$	—	$	2.1
Interest rate risk activities	—		21.1		—		21.1
Available-for-sale securities	25.3		96.1		—		121.4
Total	$	27.4	$	117.2	$	—	$	144.6
Liabilities
Commodity price risk management liabilities:
Financial price risk programs	$	1.6	$	—	$	0.1	$	1.7
Total	$	1.6	$	—	$	0.1	$	1.7

Price risk management assets and liabilities include commodity exchange-traded and non-exchange-based derivative contracts. Exchange-traded derivative contracts are based on unadjusted quoted prices in active markets and are classified within Level 1. These financial assets and liabilities are secured with cash on deposit with the exchange; therefore nonperformance risk has not been incorporated into these valuations. Certain non-exchange-traded derivatives are valued using broker or over-the-counter, on-line exchanges. In such cases, these non-exchange-traded derivatives are classified within Level 2. Non-exchange-based derivative instruments include swaps, forwards, and options. In certain instances, these instruments may utilize models to measure fair value. NiSource uses a similar model to value similar instruments. Valuation models utilize various inputs that include quoted prices for similar assets or liabilities in active markets, quoted prices for identical or similar assets or liabilities in markets that are not active, other observable inputs for the asset or liability, and market-corroborated inputs, i.e., inputs derived principally from or corroborated by observable market data by correlation or other means. Where observable inputs are available for substantially the full term of the asset or liability, the instrument is categorized in Level 2. Certain derivatives trade in less active markets with a lower availability of pricing information and models may be utilized in the valuation. When such inputs have a significant impact on the measurement of fair value, the instrument is categorized in Level 3. Credit risk is considered in the fair value calculation of derivative instruments that are not exchange-traded. Credit exposures are adjusted to reflect collateral agreements which reduce exposures. As of March 31, 2014 and December 31, 2013, there were no material transfers between fair value hierarchies. Additionally, there were no changes in the method or significant assumptions used to estimate the fair value of NiSource’s financial instruments.

Price risk management assets also include fixed-to-floating interest-rate swaps, which are designated as fair value hedges, as a means to achieve NiSource’s targeted level of variable-rate debt as a percent of total debt. NiSource uses a calculation of future cash inflows and estimated future outflows related to the swap agreements, which are discounted and netted to determine the current fair value. Additional inputs to the present value calculation include the contract terms, as well as market parameters such as current and projected interest rates and volatility. As they are based on observable data and valuations of similar instruments, the interest-rate swaps are categorized in Level 2 in the fair value hierarchy. Credit risk is considered in the fair value calculation of the interest rate swap.

Available-for-sale securities are investments pledged as collateral for trust accounts related to NiSource’s wholly-owned insurance company. Available-for-sale securities are included within “Other investments” in the Condensed Consolidated Balance Sheets (unaudited). Securities classified within Level 1 include U.S. Treasury debt securities which are highly liquid and are actively traded in over-the-counter markets. NiSource values corporate and mortgage-backed debt securities using a matrix pricing model that incorporates market-based information. These securities trade less frequently and are classified within Level 2. Total gains and losses from available-for-sale securities are included in other comprehensive income (loss). The amortized cost, gross unrealized gains and losses, and fair value of available-for-sale debt securities at March 31, 2014 and December 31, 2013 were:

March 31, 2014 (in millions)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
Available-for-sale debt securities
U.S. Treasury	$	27.0	$	0.2	$	(0.4	)	$	26.8
Corporate/Other	93.0		1.2		(0.9		)	93.3
Total Available-for-sale debt securities	$	120.0	$	1.4	$	(1.3	)	$	120.1
December 31, 2013 (in millions)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
Available-for-sale debt securities
U.S. Treasury	$	30.3	$	0.3	$	(0.5	)	$	30.1
Corporate/Other	91.5		1.1		(1.3		)	91.3
Total Available-for-sale debt securities	$	121.8	$	1.4	$	(1.8	)	$	121.4

For the three months ended March 31, 2014 and 2013, the net realized gain on the sale of available-for-sale U.S. Treasury debt securities was $0.1 million and $0.2 million, respectively. For the three months ended March 31, 2014 and 2013, the net realized gain on sale of available-for-sale Corporate/Other bond debt securities was $0.1 million and $0.2 million, respectively.

The cost of maturities sold is based upon specific identification. At March 31, 2014, approximately $2.6 million of U.S. Treasury debt securities have maturities of less than a year while the remaining securities have maturities of greater than one year. At March 31, 2014, approximately $4.4 million of Corporate/Other bonds have maturities of less than a year while the remaining securities have maturities of greater than one year.

There are no material items in the fair value reconciliation of Level 3 assets and liabilities measured at fair value on a recurring basis for the three months ended March 31, 2014 and 2013.

Non-recurring Fair Value Measurements. There were no significant non-recurring fair value measurements recorded during the three months ended March 31, 2014.

In January 2013, NiSource sold the service plan and leasing business lines of its Retail Services business. The disposed business lines were included in the Columbia Distribution Operations reporting unit and the NIPSCO Gas Distribution Operations reporting unit. Goodwill associated with the disposed business lines was included in the carrying amount of the business lines in determining the gain on disposal. The amount of the goodwill included in the carrying amount was based on the relative fair values of the business lines disposed of and the portion of the reporting units that were retained. The fair value of the disposed business lines was determined by using the selling price of the business lines. The fair value of the reporting units that were retained was determined by a weighted average of income and market approaches. This approach was similar to the process undertaken to calculate the fair value of the reporting units for the goodwill impairment test conducted on May 1, 2012. These approaches are further discussed in NiSource’s Annual Report on Form 10-K for the fiscal year ended December 31, 2012 and yield fair values considered to be at Level 3 of the fair value hierarchy. The respective fair value of the disposed business lines was divided by the fair value of the reporting units to which the disposed business lines belonged. These percentages were then applied to those goodwill balances to determine their allocations. As a result of these procedures, NiSource recorded a disposal of goodwill of approximately $11.0 million during the first quarter of 2013. This amount is included within the "Gain on Disposition of Discontinued Operations - net of taxes" on the Condensed Statements of Consolidated Income (unaudited).

B.    Other Fair Value Disclosures for Financial Instruments. The carrying amount of cash and cash equivalents, restricted cash, notes receivable, customer deposits and short-term borrowings is a reasonable estimate of fair value due to their liquid or short-term nature. NiSource’s long-term borrowings are recorded at historical amounts unless designated as a hedged item in a fair value hedge.

The following methods and assumptions were used to estimate the fair value of each class of financial instruments for which it is practicable to estimate fair value.

Long-term Debt. The fair values of these securities are estimated based on the quoted market prices for the same or similar issues or on the rates offered for securities of the same remaining maturities. Certain premium costs associated with the early settlement of long-term debt are not taken into consideration in determining fair value. These fair value measurements are classified as Level 2 within the fair value hierarchy. For the three months endedMarch 31, 2014 and 2013, there were no changes in the method or significant assumptions used to estimate the fair value of the financial instruments.

The carrying amount and estimated fair values of financial instruments were as follows:

(in millions)	Carrying Amount as of March 31, 2014		Estimated Fair Value as of March 31, 2014		Carrying Amount as of Dec. 31, 2013		Estimated Fair Value as of Dec. 31, 2013
Long-term debt (including current portion)	$	8,169.0	$	8,944.1	$	8,135.3	$	8,697.3

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Document And Entity Information	3 Months Ended
	Mar. 31, 2014	Apr. 24, 2014
Document Information [Line Items]
Document Type	10-Q
Amendment Flag	false
Document Period End Date	Mar. 31, 2014
Document Fiscal Year Focus	2014
Document Fiscal Period Focus	Q1
Entity Registrant Name	NISOURCE INC/DE
Entity Central Index Key	0001111711
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		314,876,852

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Transfers Of Financial Assets

3 Months Ended

Mar. 31, 2014

Transfers and Servicing [Abstract]

Transfers Of Financial Assets

Transfers of Financial Assets

Transfers of accounts receivable are accounted for as secured borrowings resulting in the recognition of short-term borrowings on the Condensed Consolidated Balance Sheets (unaudited). The maximum amount of debt that can be recognized related to NiSource’s accounts receivable programs is $515 million.

All accounts receivables sold to the commercial paper conduits are valued at face value, which approximates fair value due to their short-term nature. The amount of the undivided percentage ownership interest in the accounts receivables sold is determined in part by required loss reserves under the agreements. Below is information about the accounts receivable securitization agreements entered into by NiSource’s subsidiaries.

Columbia of Ohio is under an agreement to sell, without recourse, substantially all of its trade receivables, as they originate, to CGORC, a wholly-owned subsidiary of Columbia of Ohio. CGORC, in turn, is party to an agreement with BTMU and BNS under the terms of which it sells an undivided percentage ownership interest in its accounts receivable to commercial paper conduits sponsored by BTMU and BNS. This agreement was last renewed on October 18, 2013. The maximum seasonal program limit under the terms of the new agreement remains at $240 million. The current agreement expires on October 17, 2014, and can be further renewed if mutually agreed to by all parties. As of March 31, 2014, $240.0 million of accounts receivable had been transferred by CGORC. CGORC is a separate corporate entity from NiSource and Columbia of Ohio, with its own separate obligations, and upon a liquidation of CGORC, CGORC’s obligations must be satisfied out of CGORC’s assets prior to any value becoming available to CGORC’s stockholder.

NIPSCO is under an agreement to sell, without recourse, substantially all of its trade receivables, as they originate, to NARC, a wholly-owned subsidiary of NIPSCO. NARC, in turn, is party to an agreement with PNC and Mizuho under the terms of which it sells an undivided percentage ownership interest in its accounts receivable to commercial paper conduits sponsored by PNC and Mizuho. This agreement was last renewed on August 28, 2013. The maximum seasonal program limit under the terms of the new agreement remains at $200 million. The current agreement expires on August 27, 2014, and can be further renewed if mutually agreed to by all parties. As of March 31, 2014, $200.0 million of accounts receivable had been transferred by NARC. NARC is a separate corporate entity from NiSource and NIPSCO, with its own separate obligations, and upon a liquidation of NARC, NARC’s obligations must be satisfied out of NARC’s assets prior to any value becoming available to NARC’s stockholder.

Columbia of Pennsylvania is under an agreement to sell, without recourse, substantially all of its trade receivables, as they originate, to CPRC, a wholly-owned subsidiary of Columbia of Pennsylvania. CPRC, in turn, is party to an agreement with BTMU under the terms of which it sells an undivided percentage ownership interest in its accounts receivable to a commercial paper conduit sponsored by BTMU. The maximum seasonal program limit under the terms of the agreement is $75 million. The agreement with BTMU was renewed on March 11, 2014, having a current scheduled termination date of March 10, 2015, and can be further renewed if mutually agreed to by both parties. As of March 31, 2014, $75.0 million of accounts receivable had been transferred by CPRC. CPRC is a separate corporate entity from NiSource and Columbia of Pennsylvania, with its own separate obligations, and upon a liquidation of CPRC, CPRC’s obligations must be satisfied out of CPRC’s assets prior to any value becoming available to CPRC’s stockholder.

The following table reflects the gross and net receivables transferred as well as short-term borrowings related to the securitization transactions as of March 31, 2014 and December 31, 2013 for Columbia of Ohio, NIPSCO and Columbia of Pennsylvania:

(in millions)	March 31, 2014		December 31, 2013
Gross Receivables	$	811.7	$	610.9
Less: Receivables not transferred	296.7		345.8
Net receivables transferred	$	515.0	$	265.1
Short-term debt due to asset securitization	$	515.0	$	265.1

Columbia of Ohio, NIPSCO and Columbia of Pennsylvania remain responsible for collecting on the receivables securitized and the receivables cannot be sold to another party.

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Statements of Consolidated Comprehensive Income (Parenthetical) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Other Comprehensive Income (Loss), Unrealized Holding Gain (Loss) on Securities Arising During Period, Tax	$ 0.2	$ (0.1)
Other Comprehensive Income (Loss), Unrealized Gain (Loss) on Derivatives Arising During Period, Tax	0.4	0.6
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Tax	$ 0	$ 1.7

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Gas In Storage

3 Months Ended

Mar. 31, 2014

Gas in Storage [Abstract]

Gas In Storage

Gas in Storage

Both the LIFO inventory methodology and the weighted average cost methodology are used to value natural gas in storage. Gas Distribution Operations price natural gas storage injections at the average of the costs of natural gas supply purchased during the year. For interim periods, the difference between current projected replacement cost and the LIFO cost for quantities of gas temporarily withdrawn from storage is recorded as a temporary LIFO liquidation credit or debit within the Condensed Consolidated Balance Sheets (unaudited). Due to seasonality requirements, NiSource expects interim variances in LIFO layers to be replenished by year-end. NiSource had a temporary LIFO liquidation debit of $10.3 million and zero as of March 31, 2014 and December 31, 2013, respectively, for certain gas distribution companies recorded within “Prepayments and other,” on the Condensed Consolidated Balance Sheets (unaudited).

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Earnings Per Share

3 Months Ended

Mar. 31, 2014

Earnings Per Share [Abstract]

Earnings Per Share

Earnings Per Share

Basic EPS is computed by dividing income available to common stockholders by the weighted-average number of shares of common stock outstanding for the period. The weighted average shares outstanding for diluted EPS includes the incremental effects of the various long-term incentive compensation plans. The numerator in calculating both basic and diluted EPS for each period is reported net income. The computation of diluted average common shares follows:

	Three Months Ended
	March 31,
(in thousands)	2014	2013
Denominator
Basic average common shares outstanding	314,222	311,120
Dilutive potential common shares:
Stock options	59	156
Shares contingently issuable under employee stock plans	399	276
Shares restricted under stock plans	442	523
Diluted Average Common Shares	315,122	312,075

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Short-Term Borrowings

3 Months Ended

Mar. 31, 2014

Short-term Debt [Abstract]

Short-Term Borrowings

Short-Term Borrowings

On September 30, 2013, NiSource Finance amended its existing revolving credit facility with a syndicate of banks led by Barclays Capital to expand capacity to $2.0 billion and extend the termination date to September 28, 2018. The purpose of the facility is to fund ongoing working capital requirements including the provision of liquidity support for NiSource’s $1.5 billion commercial paper program, provide for issuance of letters of credit, and also for general corporate purposes. At March 31, 2014, NiSource had no outstanding borrowings under this facility.

NiSource Finance's commercial paper program has a program limit of up to $1.5 billion with a dealer group comprised of Barclays, Citigroup, Credit Suisse, RBS and Wells Fargo. Commercial paper issuances are supported by available capacity under NiSource’s $2.0 billion unsecured revolving credit facility. At March 31, 2014, NiSource had $297.5 million of commercial paper outstanding.

As of March 31, 2014, NiSource had $30.5 million of stand-by letters of credit outstanding of which $14.3 million were under the revolving credit facility. At December 31, 2013, NiSource had $31.6 million of stand-by letters of credit outstanding of which $14.3 million were under the revolving credit facility.

Transfers of accounts receivable are accounted for as secured borrowings resulting in the recognition of short-term debt on the Condensed Consolidated Balance Sheets (unaudited) in the amount of $515.0 million and $265.1 million as of March 31, 2014 and December 31, 2013, respectively. Refer to Note 10, “Transfers of Financial Assets,” for additional information.

(in millions)	March 31, 2014		December 31, 2013
Commercial Paper weighted average interest rate of 0.55% and 0.70% at March 31, 2014 and December 31, 2013, respectively.	$	297.5	$	433.6
Accounts receivable securitization facility borrowings	515.0		265.1
Total short-term borrowings	$	812.5	$	698.7

Given their turnover is less than 90 days, cash flows related to the borrowings and repayments of the items listed above are presented net in the Condensed Statements of Consolidated Cash Flows (unaudited).

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Goodwill

3 Months Ended

Mar. 31, 2014

Goodwill and Intangible Assets Disclosure [Abstract]

Goodwill

Goodwill

NiSource considered whether there were any events or changes in circumstances subsequent to the annual test that would reduce the fair value of any of the reporting units below their carrying amounts and necessitate another goodwill impairment test. No such indicators were noted that would require a subsequent goodwill impairment testing during the first quarter of 2014.

During the first quarter of 2013, as part of the sale of the service plan and leasing business lines of its Retail Services business, NiSource allocated $10.0 million of goodwill from Columbia Distribution Operations to the sale and allocated $1.0 million of goodwill from NIPSCO Gas Distribution Operations to the sale. Refer to Note 5 "Discontinued Operations and Assets and Liabilities Held for Sale" for more information.

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Regulatory Matters

3 Months Ended

Mar. 31, 2014

Regulatory Assets and Liabilities Disclosure [Abstract]

Regulatory Matters

Regulatory Matters

Gas Distribution Operations Regulatory Matters

Significant Rate Developments. On April 30, 2013, Indiana Governor Pence signed Senate Enrolled Act 560 into law. Among other provisions, this legislation provides for cost recovery outside of a base rate proceeding for new or replacement electric and gas transmission, distribution, and storage projects that a public utility undertakes for the purposes of safety, reliability, system modernization, or economic development. Provisions of the TDSIC statute require that, among other things, requests for recovery include a seven year plan of eligible investments.  Once the plan is approved by the IURC, 80 percent of eligible costs can be recovered using a periodic rate adjustment mechanism.  The cost recovery mechanism is referred to as a TDSIC mechanism. Recoverable costs include a return on, and of, the investment, including AFUDC, post in service carrying charges, operation and maintenance expenses, depreciation, and property taxes.  The remaining 20 percent of recoverable costs are to be deferred for future recovery in the public utility’s next general rate case.  The periodic rate adjustment mechanism is capped at an annual increase of no more than two percent of total retail revenues. On October 3, 2013, NIPSCO filed its gas TDSIC seven-year plan of eligible investments for a total of approximately $710 million with the IURC. An order is expected by the second quarter of 2014.

On November 25, 2013, Columbia of Ohio filed a Notice of Intent to file an application to adjust rates associated with its IRP and DSM Riders. Columbia of Ohio filed its Application on February 28, 2014, requesting authority to increase revenues by approximately $25.5 million. The parties have settled all issues, and on April 7, 2014 filed a stipulation providing for a revenue increase of approximately $25.5 million. On April 23, 2014, Columbia of Ohioreceived approval of its annual infrastructure replacement and demand-side management rider request from the PUCO. New rates are effective April 30, 2014.

On April 16, 2013, Columbia of Massachusetts submitted a filing with the Massachusetts DPU requesting an annual revenue requirement increase of $30.1 million. Pursuant to the procedural schedule for this case, on September 3, 2013, Columbia of Massachusetts filed its updated revenue requirement of $29.5 million and on October 16, 2013, filed an updated cost of service for $30.0 million. A final revenue requirement update of $29.9 million was filed on December 16, 2013. On February 28, 2014 the Massachusetts DPU issued an order granting an annual revenue requirement increase of $19.3 million effective March 1, 2014, and the compliance filing associated with the order has been approved. Columbia of Massachusetts currently has two Motions for Reconsideration and Clarification pending before the Massachusetts DPU with regard to specific findings in the order.

On September 16, 2013, Columbia of Massachusetts filed its Peak Period Gas Adjustment Factor (“GAF”) for the period November 1, 2013 through April 30 2014, and its Peak Period 2012-2013 GAF Reconciliation. On January 17, 2014, Columbia of Massachusetts filed a revision to the GAF effective February 1, 2014, and on February 18, 2014, Columbia of Massachusetts filed its second revision to the GAF effective March 1, 2014, to eliminate Columbia of Massachusetts’s projected Peak Period under-collection of $50 million. On February 28, 2014, the Massachusetts DPU approved the revision subject to further review and reconciliation, but deferred recovery of $25 million of the projected under-collection to November 2014 - April 2015, and thus, this deferred amount will be incorporated into the proposed GAF to be submitted in Columbia of Massachusetts’s 2014-2015 Peak Period GAF filing.

On March 21, 2014, Columbia of Pennsylvania filed a base rate case with the Pennsylvania PUC, seeking a revenue increase of approximately $54.1 million annually. The case is driven by Columbia of Pennsylvania’s capital investment program which exceeds $180 million in both 2014 and 2015 as well as new pipeline safety-related operation and maintenance expenditures. Columbia of Pennsylvania seeks Pennsylvania PUC approval to implement additional rates to recover costs that are projected to be incurred after the implementation of those new rates, as authorized by the Pennsylvania General Assembly with the passage of Act 11 of 2012. Columbia of Pennsylvania's filing seeks to implement rates in December 2014 under which Columbia of Pennsylvania would immediately begin to recover costs that are projected for the twelve-month period ending December 31, 2015. The case is currently in discovery, and a final order from the Pennsylvania PUC is expected in the fourth quarter of 2014.

Cost Recovery and Trackers. A significant portion of the distribution companies' revenue is related to the recovery of gas costs, the review and recovery of which occurs via standard regulatory proceedings. All states require periodic review of actual gas procurement activity to determine prudence and to permit the recovery of prudently incurred costs related to the supply of gas for customers. NiSource distribution companies have historically been found prudent in the procurement of gas supplies to serve customers.

Certain operating costs of the NiSource distribution companies are significant, recurring in nature, and generally outside the control of the distribution companies. Some states allow the recovery of such costs via cost tracking mechanisms. Such tracking mechanisms allow for abbreviated regulatory proceedings in order for the distribution companies to implement charges and recover appropriate costs. Tracking mechanisms allow for more timely recovery of such costs as compared with more traditional cost recovery mechanisms. Examples of such mechanisms include GCR adjustment mechanisms, tax riders, gas energy efficiency programs, and bad debt recovery mechanisms.

Comparability of Gas Distribution Operations line item operating results is impacted by regulatory trackers that allow for the recovery in rates of certain costs such as bad debt expenses. Increases in the expenses that are subject to trackers result in a corresponding increase in net revenues and therefore have essentially no impact on total operating income results.

Certain of the NiSource distribution companies have completed rate proceedings involving infrastructure replacement or are embarking upon regulatory initiatives to replace significant portions of their operating systems that are nearing the end of their useful lives. Each LDC's approach to cost recovery may be unique, given the different laws, regulations and precedent that exist in each jurisdiction.

Columbia Pipeline Group Operations Regulatory Matters

Significant Rate Developments. On January 30, 2014, Columbia Transmission received FERC approval of its December 2013 filing to recover costs associated with the first year of its comprehensive system modernization program. During 2013, Columbia Transmission completed more than 30 individual projects representing a total investment of about $300 million. The program includes replacement of aging pipeline and compressor facilities, enhancements to system inspection capabilities, and improvements in real-time analytics and control systems. Recovery of the 2013 investments began on February 1, 2014.

The second year of the program includes planned modernization investments of approximately $300 million. Columbia Transmission and its customers have agreed to the initial five years of the comprehensive modernization program, with an opportunity to mutually extend the agreement.

Cost Recovery Trackers.A significant portion of the regulated transmission and storage companies' revenue is related to the recovery of their operating costs, the review and recovery of which occurs via standard regulatory proceedings with the FERC under section 4 of the Natural Gas Act. However, certain operating costs of the NiSource regulated transmission and storage companies are significant and recurring in nature, such as fuel for compression and lost and unaccounted for gas. The FERC allows for the recovery of such costs via cost tracking mechanisms. These tracking mechanisms allow the transmission and storage companies' rates to fluctuate in response to changes in certain operating costs or conditions as they occur to facilitate the timely recovery of its costs incurred. The tracking mechanisms involve a rate adjustment that is filed at a predetermined frequency, typically annually, with the FERC and is subject to regulatory review before new rates go into effect. Other such costs under regulatory tracking mechanisms include third-party pipeline transportation, electric compression, certain environmental, and certain operational purchases and sales of natural gas.

Electric Operations Regulatory Matters

Significant Rate Developments. On July 19, 2013, NIPSCO filed its electric TDSIC, further discussed above, with the IURC. The filing included the seven-year plan of eligible investments for a total of approximately $1.1 billion with the majority of the spend occurring in years 2016 through 2020. On February 17, 2014, the IURC issued an order approving NIPSCO’s seven-year plan of eligible investments. The Order also granted NIPSCO ratemaking relief associated with the eligible investments through a rate adjustment mechanism. NIPSCO anticipates filing its first semi-annual tracker petition in the third quarter of 2014. On March 10, 2014 the OUCC filed a Petition for Reconsideration with the IURC which is still pending. In addition, two parties have filed Notices of Appeal with the Indiana Court of Appeals to appeal the IURC's ruling.

On November 12, 2013, several industrial customers, including INDIEC, filed a complaint at the FERC regarding the 12.38% base ROE used to set the MISO Transmission Owners' transmission rates and requesting a reduction in the base ROE to 9.15%. The complaint further requests that FERC limit the capital structure of MISO Transmission Owners to no more than 50% common equity for ratemaking purposes and that FERC eliminate incentive adders for membership in a RTO. NIPSCO joined in an answer defending the 12.38% base ROE and motion to dismiss the complaint filed on behalf of a group of MISO Transmission Owners on January 6, 2014. NIPSCO is unable to estimate the impact of this complaint or the timing of any potential impact at this time.

Cost Recovery and Trackers. A significant portion of NIPSCO's revenue is related to the recovery of fuel costs to generate power and purchased power. These costs are recovered through a FAC, a standard, quarterly, “summary” regulatory proceeding in Indiana.

Certain operating costs of the Electric Operations are significant, recurring in nature, and generally outside the control of NIPSCO. The IURC allows for recovery of such costs via cost tracking mechanisms. Such tracking mechanisms allow for abbreviated regulatory proceedings in order for NIPSCO to implement charges and recover appropriate costs. Tracking mechanisms allow for more timely recovery of such costs as compared with more traditional cost recovery mechanisms. Examples of such mechanisms include electric energy efficiency programs, MISO non-fuel costs and revenues, resource capacity charges, and environmental related costs.

NIPSCO has approval from the IURC to recover certain environmental related costs through an ECT. Under the ECT, NIPSCO is permitted to recover (1) AFUDC and a return on the capital investment expended by NIPSCO to implement environmental compliance plan projects through an ECRM and (2) related operation and maintenance and depreciation expenses once the environmental facilities become operational through an EERM. On January 31, 2014, NIPSCO filed ECR-23 which included $583.5 million of net capital expenditures for the period ending December 31, 2013. An order is expected by the second quarter of 2014.

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Income Taxes (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended			3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Apr. 30, 2013	Mar. 25, 2014 Previous [Member]	Mar. 25, 2014 Current [Member]
Income Taxes [Line Items]
Effective income tax rates	37.90%	35.40%
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate	35.00%
Increase (Decrease) in Effective Tax Rate	2.50%
Corporate Income Tax Rate				6.50%	4.90%
Tax Expense Recognized Due to Rate Change	$ 7.1
Income Taxes Receivable	15.9
Operating Loss Carryforwards	0.6
Income tax refunds		$ 75.1	$ 70.6

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Discontinued Operations And Assets And Liabilities Held For Sale

3 Months Ended

Mar. 31, 2014

Discontinued Operations And Assets And Liabilities Held For Sale [Abstract]

Discontinued Operations And Assets And Liabilities Held For Sale

Discontinued Operations and Assets and Liabilities Held for Sale

On September 1, 2013, NiSource sold the commercial and industrial natural gas portfolio of its unregulated natural gas marketing business. The sale included the physical contracts and associated financial hedges that comprise the portfolio, as well as the gas inventory and customer deposits of the business. The sale resulted in an after tax loss of $1.5 million which was recorded during the third quarter of 2013.

During 2012, NiSource began marketing to sell the service plan and leasing business lines of its Retail Services business. The sale of the business lines closed in January 2013 resulting in gain from the disposition of discontinued operations of $36.4 million, net of taxes, which was recorded during the first quarter of 2013.

There were no assets and liabilities of discontinued operations and held for sale on the Condensed Consolidated Balance Sheets (unaudited) at March 31, 2014 and December 31, 2013.

Results from discontinued operations are provided in the following table. These results are primarily from a settlement at NiSource's former exploration and production subsidiary, CER, NiSource's Retail Services business, and NiSource's unregulated natural gas marketing business.

	Three Months Ended March 31,
(in millions)	2014			2013
Revenues from Discontinued Operations	$	—		$	16.2
(Loss) Income from discontinued operations	(0.3		)	13.2
Income tax (benefit) expense	(0.1		)	5.1
(Loss) Income from Discontinued Operations - net of taxes	$	(0.2	)	$	8.1
Gain on Disposition of Discontinued Operations - net of taxes	$	—		$	36.4

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Asset Retirement Obligations

3 Months Ended

Mar. 31, 2014

Asset Retirement Obligation [Abstract]

Asset Retirement Obligations

Asset Retirement Obligations

Certain costs of removal that have been, and continue to be, included in depreciation rates and collected in the service rates of the rate-regulated subsidiaries are classified as “Regulatory liabilities” on the Condensed Consolidated Balance Sheets (unaudited).

Changes in NiSource’s liability for asset retirement obligations for the three months ended March 31, 2014 and 2013 are presented in the table below:

(in millions)	2014			2013
Balance as of January 1,	$	174.4		$	160.4
Accretion expense	0.4			0.3
Accretion recorded as a regulatory asset/liability	2.1			2.3
Additions	0.1			2.9
Settlements	(0.5		)	(0.3		)
Change in estimated cash flows	—			(0.3		)
Balance as of March 31,	$	176.5		$	165.3

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Risk Management Activities

3 Months Ended

Mar. 31, 2014

Derivative Instruments and Hedges, Assets [Abstract]

Risk Management And Energy Marketing Activities

Risk Management Activities

NiSource is exposed to certain risks relating to its ongoing business operations. The primary risks managed by using derivative instruments are commodity price risk and interest rate risk. Derivative natural gas contracts are entered into to manage the price risk associated with natural gas price volatility and to secure forward natural gas prices. Interest rate swaps are entered into to manage interest rate risk or fair value risk associated with NiSource’s borrowings. NiSource designates some of its commodity forward contracts as cash flow hedges of forecasted purchases of commodities and designates its interest rate swaps as fair value hedges of fixed-rate borrowings.

Accounting Policy for Derivative Instruments.    Unrealized and realized gains and losses are recognized each period as components of AOCI, regulatory assets and liabilities or earnings depending on the designation of the derivative instrument and regulatory accounting treatment. For subsidiaries that utilize derivatives for cash flow hedges, the effective portions of the gains and losses are recorded to AOCI and are recognized in earnings concurrent with the disposition of the hedged risks. If a forecasted transaction corresponding to a cash flow hedge is no longer probable to occur, the accumulated gains or losses on the derivative are recognized currently in earnings. For fair value hedges, the gains and losses are recorded in earnings each period together with the change in the fair value of the hedged item. As a result of the rate-making process, the rate-regulated subsidiaries generally record gains and losses as regulatory liabilities or assets and recognize such gains or losses in earnings when both the contracts settle and the physical commodity flows. These gains and losses recognized in earnings are then subsequently recovered or passed back to customers in revenues through rates. When gains and losses are recognized in earnings, they are recognized in revenues or cost of sales for derivatives that correspond to commodity risk activities and are recognized in interest expense for derivatives that correspond to interest-rate risk activities.

For its commodity price risk programs, NiSource has elected not to net the fair value amounts of its derivative instruments or the fair value amounts recognized for its right to receive or obligation to pay cash collateral arising from those derivative instruments recognized at fair value, which are executed with the same counterparty under a master netting arrangement. NiSource discloses amounts recognized for the right to reclaim cash collateral within “Restricted cash” and amounts recognized for the obligation to return cash collateral within “Other accruals” on the Condensed Consolidated Balance Sheets (unaudited).

Commodity Price Risk Programs.    

Commodity price risk program derivatives consist of NYMEX gas options, NYMEX gas futures and FTRs. Contracted gross volumes are as follows:

	March 31, 2014	December 31, 2013
Commodity Price Risk Program:
Gas price volatility program derivatives (MMDth)	13.9	17.0
Price Protection Service program derivatives (MMDth)	0.3	0.7
DependaBill program derivatives (MMDth)	0.1	0.2
Electric energy program FTR derivatives (mw)	—	1,248.0

Interest Rate Risk Activities. NiSource recognizes that the prudent and selective use of derivatives may help it to lower its cost of debt capital and manage its interest rate exposure. NiSource Finance has entered into various “receive fixed” and “pay floating” interest rate swap agreements which modify the interest rate characteristics of a portion of its outstanding long-term debt from fixed to variable rate. These interest rate swaps also serve to hedge the fair market value of NiSource Finance’s outstanding debt portfolio. As of March 31, 2014, NiSource had $7.7 billion of outstanding fixed rate debt, of which $500 million is subject to fluctuations in interest rates as a result of the fixed-to-variable interest rate swap transactions. These interest rate swaps are designated as fair value hedges. NiSource had no net gain or loss recognized in earnings due to hedging ineffectiveness for the three months ended March 31, 2014 and 2013.

On July 22, 2003, NiSource Finance entered into fixed-to-variable interest rate swap agreements in a notional amount of $500 million with four counterparties which will expire on July 15, 2014. NiSource Finance receives payments based upon a fixed 5.40% interest rate and pays a floating interest amount based on U.S. 6-month BBA LIBOR plus an average of 0.78% per annum. There was no exchange of premium at the initial date of the swaps.

Contemporaneously with the issuance on September 16, 2005 of $1 billion of its 5.25% and 5.45% notes, maturing September 15, 2017 and 2020, respectively, NiSource Finance settled $900 million of forward starting interest rate swap agreements with six counterparties. NiSource paid an aggregate settlement payment of $35.5 million which is being amortized from AOCI to interest expense over the term of the underlying debt, resulting in an effective interest rate of 5.67% and 5.88%, respectively. As of March 31, 2014, AOCI includes $7.8 million related to forward starting interest rate swap settlement, net of tax. These derivative contracts are accounted for as a cash flow hedge.

As of March 31, 2014, NiSource holds a 47.5% interest in Millennium. As NiSource reports Millennium as an equity method investment, NiSource is required to recognize a proportional share of Millennium’s OCI. NiSource’s proportionate share of the remaining unrecognized loss associated with settled interest rate swaps was $17.4 million and $17.7 million, net of tax, as of March 31, 2014 and December 31, 2013, respectively. Millennium is amortizing the losses related to these terminated interest rate swaps into earnings using the effective interest method through interest expense as interest payments are made. NiSource records its proportionate share of the amortization as Equity Earnings in Unconsolidated Affiliates in the Condensed Statements of Consolidated Income (unaudited).

NiSource’s location and fair value of derivative instruments on the Condensed Consolidated Balance Sheets (unaudited) were:

Asset Derivatives(in millions)	March 31, 2014		December 31, 2013
Balance Sheet Location	Fair Value		Fair Value
Derivatives designated as hedging instruments
Commodity price risk programs
Price risk management assets (current)	$	0.1	$	—
Interest rate risk activities
Price risk management assets (current)	10.7		21.2
Total derivatives designated as hedging instruments	$	10.8	$	21.2
Derivatives not designated as hedging instruments
Commodity price risk programs
Price risk management assets (current)	$	3.6	$	1.5
Price risk management assets (noncurrent)	—		0.5
Total derivatives not designated as hedging instruments	$	3.6	$	2.0
Total Asset Derivatives	$	14.4	$	23.2

There were no significant liability derivatives as of March 31, 2014 and December 31, 2013.

As noted in NiSource's accounting policy for derivative instruments, above, for its commodity price risk programs, NiSource has elected not to net fair value amounts for its derivative instruments or the fair value amounts recognized for its right to receive cash collateral or obligation to pay cash collateral arising from those derivative instruments recognized at fair value, which are executed with the same counterparty under a master netting arrangement.

The tables below represent the amounts subject to an enforceable master netting arrangement not otherwise disclosed:

Offsetting of Derivative Assets (in millions)
As of March 31, 2014
	Gross Amounts of Recognized Assets		Gross Amounts Offset in the Statement of Financial Position		Net Amounts of Assets Presented in the Statement of Financial Position		Gross Amounts Not Offset in the Statement of Financial Position			Net Amount
Counterparty B	$	3.7	$	—	$	3.7	$	(0.4	)	$	3.3
Other (1)	10.7		—		10.7		—			10.7
Total	$	14.4	$	—	$	14.4	$	(0.4	)	$	14.0

Offsetting of Derivative Liabilities (in millions)
As of March 31, 2014
	Gross Amounts of Recognized Liabilities			Gross Amounts Offset in the Statement of Financial Position		Net Amounts of Liabilities Presented in the Statement of Financial Position			Gross Amounts Not Offset in the Statement of Financial Position		Net Amount
Counterparty B	$	(0.4	)	$	—	$	(0.4	)	$	0.4	$	—
Total	$	(0.4	)	$	—	$	(0.4	)	$	0.4	$	—

Offsetting of Derivative Assets (in millions)
As of December 31, 2013
	Gross Amounts of Recognized Assets		Gross Amounts Offset in the Statement of Financial Position		Net Amounts of Assets Presented in the Statement of Financial Position		Gross Amounts Not Offset in the Statement of Financial Position			Net Amount
Counterparty B	$	2.1	$	—	$	2.1	$	(1.7	)	$	0.4
Other (1)	21.1		—		21.1		—			21.1
Total	$	23.2	$	—	$	23.2	$	(1.7	)	$	21.5

Offsetting of Derivative Liabilities (in millions)
As of December 31, 2013
	Gross Amounts of Recognized Liabilities			Gross Amounts Offset in the Statement of Financial Position		Net Amounts of Liabilities Presented in the Statement of Financial Position			Gross Amounts Not Offset in the Statement of Financial Position		Net Amount
Counterparty B	$	(1.7	)	$	—	$	(1.7	)	$	1.7	$	—
Total	$	(1.7	)	$	—	$	(1.7	)	$	1.7	$	—

⁽¹⁾ Amounts in "Other" include fixed-to-variable interest rate swap agreements entered into by NiSource.

The effect of derivative instruments on the Condensed Statements of Consolidated Income (unaudited) was:

Derivatives in Cash Flow Hedging Relationships

Three Months Ended (in millions)
	Amount of Gain Recognized in OCI on Derivative (Effective Portion)				Location of Loss Reclassified from  AOCI into Income (Effective Portion)	Amount of (Loss) Gain Reclassified from AOCI into Income (Effective Portion)
Derivatives in Cash Flow Hedging Relationships	March 31, 2014		March 31, 2013			March 31, 2014			March 31, 2013
Commodity price risk programs	$	0.1	$	0.1	Cost of Sales	$	(0.1	)	$	0.1
Interest rate risk activities	—		—		Interest expense, net	(0.4		)	(0.4		)
Total	$	0.1	$	0.1		$	(0.5	)	$	(0.3	)

There was no income statement recognition of gains or losses for the ineffective portion and amounts excluded from effectiveness testing for derivatives in cash flow hedging relationships for the three months endedMarch 31, 2014 and 2013.

It is anticipated that during the next twelve months the expiration and settlement of cash flow hedge contracts will result in income statement recognition of amounts currently classified in AOCI of approximately $0.1 million of gain, net of taxes.

Derivatives in Fair Value Hedging Relationships

Three Months Ended (in millions)
Derivatives in Fair Value Hedging Relationships	Location of Loss Recognized in Income on Derivatives	Amount of Loss Recognized in Income on Derivatives
		March 31, 2014			March 31, 2013
Interest rate risk activities	Interest expense, net	$	(10.4	)	$	(9.7	)
Total		$	(10.4	)	$	(9.7	)

Three Months Ended (in millions)
Hedged Item in Fair Value Hedge Relationships	Location of Gain Recognized in Income on Related Hedged Item	Amount of Gain Recognized in Income on Related Hedged Items
		March 31, 2014		March 31, 2013
Fixed-rate debt	Interest expense, net	$	10.4	$	9.7
Total		$	10.4	$	9.7

Derivatives not designated as hedging instruments

Three Months Ended (in millions)
Derivatives Not Designated as Hedging Instruments	Location of Gain (Loss) Recognized in Income on Derivatives	Amount of Realized/Unrealized Gain (Loss) Recognized in Income on Derivatives(1)
		March 31, 2014		March 31, 2013
Commodity price risk programs	Gas Distribution revenues	$	—	$	0.1
Commodity price risk programs	Cost of Sales	6.9		(6.7		)
Commodity price risk programs	(Loss) Income from Discontinued Operations - net of taxes	—		0.2
Total		$	6.9	$	(6.4	)

⁽¹⁾ For the amounts of realized/unrealized gain (loss) recognized in income on derivatives disclosed in the table above, gains of $6.9 million and $6.6 million for the three months ended March 31, 2014 and 2013, respectively, were deferred as allowed per regulatory orders. These amounts will be amortized to income over future periods of up to twelve months as specified in a regulatory order.

NiSource’s derivative instruments measured at fair value as of March 31, 2014 and December 31, 2013 do not contain any credit-risk-related contingent features.

Certain NiSource affiliates have physical commodity purchase agreements that contain “ratings triggers” that require increases in collateral if the credit rating of NiSource or certain of its affiliates are rated below BBB- by Standard & Poor’s or below Baa3 by Moody’s. These agreements are primarily for the physical purchase or sale of natural gas and electricity. The collateral requirement from a downgrade below the ratings trigger levels would amount to approximately $0.9 million. In addition to agreements with ratings triggers, there are some agreements that contain “adequate assurance” or “material adverse change” provisions that could result in additional credit support such as letters of credit and cash collateral to transact business.

NiSource had $5.3 million and $5.9 million of cash on deposit with brokers and MISO for collateral requirements associated with open derivative positions reflected within “Restricted cash” on the Condensed Consolidated Balance Sheets (unaudited) as of March 31, 2014 and December 31, 2013, respectively.

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Short-Term Borrowings (Narrative) (Details) (USD $)	9 Months Ended
	Sep. 30, 2013	Mar. 31, 2014	Dec. 31, 2013
Short-term Debt [Line Items]
Commercial paper outstanding		$ 297,500,000	$ 433,600,000
Revolving credit facility	2,000,000,000
Revolving Credit Facility, Expiration Date	Sep. 28, 2018
Accounts receivable securitization facility borrowings		515,000,000	265,100,000
Short-term borrowings		812,500,000	698,700,000
Letters Of Credit [Member]
Short-term Debt [Line Items]
Letters of Credit Outstanding, Amount		30,500,000	31,600,000
Revolving Credit Facility [Member]
Short-term Debt [Line Items]
Revolving credit facility		2,000,000,000
Line of Credit Facility, Amount Outstanding		0
Commercial Paper [Member]
Short-term Debt [Line Items]
Commercial paper outstanding		297,500,000
Revolving credit facility		1,500,000,000
Standby Letters of Credit [Member]
Short-term Debt [Line Items]
Line of Credit Facility, Amount Outstanding		$ 14,300,000	$ 14,300,000

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Share-Based Compensation (Narrative) (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	May 11, 2010
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant			8,000,000
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Authorized	6,162,981
Allocated Share-based Compensation Expense	$ 5.3	$ 4.2
Employee Service Share-based Compensation, Tax Benefit from Compensation Expense	2.0	1.5
Employee Service Share-based Compensation, Nonvested Awards, Total Compensation Cost Not yet Recognized	31.8
Employee Service Share Based Compensation Nonvested Awards Weighted Average Remaining Requisite Service Period	2 years 4 months
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Number	200,000
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding, Weighted Average Exercise Price	$ 22.62
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Gross	0	0
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercisable, Intrinsic Value	3.1
Employee Service Share-based Compensation, Cash Received from Exercise of Stock Options	3.9	13.1
Defined Contribution Plan, Cost Recognized	8.5	6.4
Restricted Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	67,594
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Total Fair Value	2.1
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number	324,585
Performance Shares [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period	525,173
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Total Fair Value	$ 16.3
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Nonvested, Number	1,878,558
Omnibus Plan [Member] | Restricted Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Goods and Nonemployee Services Transaction, Quantity of Securities Issued	144,578
Director Plan [Member] | Restricted Awards [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Share-based Goods and Nonemployee Services Transaction, Quantity of Securities Issued	147,845

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Variable Interests and Variable Interest Entities (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Schedule of Equity Method Investments [Line Items]
Payments made to Pure Air	$ 5.4	$ 5.6

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Fair Value (Tables)

3 Months Ended

Mar. 31, 2014

Fair Value Disclosures [Abstract]

Schedule of Fair Value, Assets and Liabilities Measured on Recurring Basis

Recurring Fair Value Measurements March 31, 2014 (in millions)	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Balance as of March 31, 2014
Assets
Commodity price risk management assets:
Financial price risk programs	$	3.7	$	—	$	—	$	3.7
Interest rate risk activities	—		10.7		—		10.7
Available-for-sale securities	24.2		95.9		—		120.1
Total	$	27.9	$	106.6	$	—	$	134.5
Liabilities
Commodity price risk management liabilities:
Financial price risk programs	$	0.1	$	—	$	0.3	$	0.4
Total	$	0.1	$	—	$	0.3	$	0.4

Recurring Fair Value Measurements December 31, 2013 (in millions)	Quoted Prices in Active Markets for Identical Assets (Level 1)		Significant Other Observable Inputs (Level 2)		Significant Unobservable Inputs (Level 3)		Balance as of December 31, 2013
Assets
Commodity price risk management assets:
Financial price risk programs	$	2.1	$	—	$	—	$	2.1
Interest rate risk activities	—		21.1		—		21.1
Available-for-sale securities	25.3		96.1		—		121.4
Total	$	27.4	$	117.2	$	—	$	144.6
Liabilities
Commodity price risk management liabilities:
Financial price risk programs	$	1.6	$	—	$	0.1	$	1.7
Total	$	1.6	$	—	$	0.1	$	1.7

Available-For-Sale Debt Securities

March 31, 2014 (in millions)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
Available-for-sale debt securities
U.S. Treasury	$	27.0	$	0.2	$	(0.4	)	$	26.8
Corporate/Other	93.0		1.2		(0.9		)	93.3
Total Available-for-sale debt securities	$	120.0	$	1.4	$	(1.3	)	$	120.1
December 31, 2013 (in millions)	Amortized Cost		Gross Unrealized Gains		Gross Unrealized Losses			Fair Value
Available-for-sale debt securities
U.S. Treasury	$	30.3	$	0.3	$	(0.5	)	$	30.1
Corporate/Other	91.5		1.1		(1.3		)	91.3
Total Available-for-sale debt securities	$	121.8	$	1.4	$	(1.8	)	$	121.4

Carrying Amount And Estimated Fair Values Of Financial Instruments

(in millions)	Carrying Amount as of March 31, 2014		Estimated Fair Value as of March 31, 2014		Carrying Amount as of Dec. 31, 2013		Estimated Fair Value as of Dec. 31, 2013
Long-term debt (including current portion)	$	8,169.0	$	8,944.1	$	8,135.3	$	8,697.3

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Risk Management Activities Risk Management Activities (Offsetting Assets and Liabilities) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014		Dec. 31, 2013
Offsetting Assets and Liabilities [Line Items]
Gross Amounts of Recognized Assets	$ 14.4		$ 23.2
Gross Amounts Offset in the Statement of Financial Position	0		0
Net Amounts of Assets Presented in the Statement of Financial Position	14.4		23.2
Gross Amounts Not Offset in the Statement of Financial Position	(0.4)		(1.7)
Net Derivative Position - Assets	14.0		21.5
Gross Amounts of Recognized Liabilities	(0.4)		(1.7)
Gross Amounts Offset in the Statement of Financial Position-Liabilities	0		0
Net Amounts of Liabilities Presented in the Statement of Financial Position	(0.4)		(1.7)
Gross Amounts Not Offset in the Statement of Financial Position- Liabilities	0.4		1.7
Net Derivative Position-Liabilities	0		0
Counterparty B [Member]
Offsetting Assets and Liabilities [Line Items]
Gross Amounts of Recognized Assets	3.7		2.1
Gross Amounts Offset in the Statement of Financial Position	0		0
Net Amounts of Assets Presented in the Statement of Financial Position	3.7		2.1
Gross Amounts Not Offset in the Statement of Financial Position	(0.4)		(1.7)
Net Derivative Position - Assets	3.3		0.4
Gross Amounts of Recognized Liabilities	(0.4)		(1.7)
Gross Amounts Offset in the Statement of Financial Position-Liabilities	0		0
Net Amounts of Liabilities Presented in the Statement of Financial Position	(0.4)		(1.7)
Gross Amounts Not Offset in the Statement of Financial Position- Liabilities	0.4		1.7
Net Derivative Position-Liabilities	0		0
Counterparty Other [Member]
Offsetting Assets and Liabilities [Line Items]
Gross Amounts of Recognized Assets	10.7	[1]	21.1	[1]
Gross Amounts Offset in the Statement of Financial Position	0	[1]	0	[1]
Net Amounts of Assets Presented in the Statement of Financial Position	10.7	[1]	21.1	[1]
Gross Amounts Not Offset in the Statement of Financial Position	0	[1]	0	[1]
Net Derivative Position - Assets	$ 10.7	[1]	$ 21.1	[1]

[1] Amounts in "Other" include fixed-to-variable interest rate swap agreements entered into by NiSource.

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Pension And Other Postretirement Benefits

3 Months Ended

Mar. 31, 2014

Pension and Other Postretirement Benefit Expense [Abstract]

Pension And Other Postretirement Benefits

Pension and Other Postretirement Benefits

NiSource provides defined contribution plans and noncontributory defined benefit retirement plans that cover its employees. Benefits under the defined benefit retirement plans reflect the employees’ compensation, years of service and age at retirement. Additionally, NiSource provides health care and life insurance benefits for certain retired employees. The majority of employees may become eligible for these benefits if they reach retirement age while working for NiSource. The expected cost of such benefits is accrued during the employees’ years of service. Current rates of rate-regulated companies include postretirement benefit costs, including amortization of the regulatory assets that arose prior to inclusion of these costs in rates. For most plans, cash contributions are remitted to grantor trusts.

For the three months ended March 31, 2014, NiSource has contributed $0.7 million to its pension plans and $9.2 million to its other postretirement benefit plans.

The following table provides the components of the plans’ net periodic benefits cost for the three months ended March 31, 2014 and 2013:

	Pension Benefits						Other Postretirement Benefits
Three Months Ended March 31, (in millions)	2014			2013			2014			2013
Components of Net Periodic Benefit Cost
Service cost	$	8.7		$	9.4		$	2.3		$	3.0
Interest cost	27.3			24.3			8.2			8.1
Expected return on assets	(45.3		)	(42.4		)	(9.1		)	(7.6		)
Amortization of transition obligation	—			—			—			0.1
Amortization of prior service cost (credit)	—			0.1			(0.6		)	(0.2		)
Recognized actuarial loss	11.9			20.7			—			2.8
Settlement loss	—			20.7			—			—
Total Net Periodic Benefit Costs	$	2.6		$	32.8		$	0.8		$	6.2

In 2013, NiSource pension plans had lump sum payouts exceeding the plan's 2013 service cost plus interest cost and, therefore, settlement accounting was required.

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Accumulated Other Comprehensive Loss

3 Months Ended

Mar. 31, 2014

Other Comprehensive Income (Loss), Tax [Abstract]

Accumulated Other Comprehensive Loss

Accumulated Other Comprehensive Loss

The following tables display the components of Accumulated Other Comprehensive Loss for the three months ended March 31, 2014 and 2013:

Three Months Ended March 31, 2014 (in millions)	Gains and Losses on Securities(1)			Gains and Losses on Cash Flow Hedges(1)			Pension and OPEB Items(1)			Accumulated Other Comprehensive Loss(1)
Balance as of January 1, 2014	$	(0.3	)	$	(25.8	)	$	(17.5	)	$	(43.6	)
Other comprehensive income before reclassifications	0.5			0.1			—			0.6
Amounts reclassified from accumulated other comprehensive income	(0.2		)	0.5			0.2			0.5
Net current-period other comprehensive income	0.3			0.6			0.2			1.1
Balance as of March 31, 2014	$	—		$	(25.2	)	$	(17.3	)	$	(42.5	)

Three Months Ended March 31, 2013 (in millions)	Gains and Losses on Securities(1)			Gains and Losses on Cash Flow Hedges(1)			Pension and OPEB Items(1)			Accumulated Other Comprehensive Loss(1)
Balance as of January 1, 2013	$	2.6		$	(28.6	)	$	(39.5	)	$	(65.5	)
Other comprehensive income before reclassifications	(0.1		)	0.1			1.3			1.3
Amounts reclassified from accumulated other comprehensive income	(0.3		)	0.8			1.4			1.9
Net current-period other comprehensive income	(0.4		)	0.9			2.7			3.2
Balance as of March 31, 2013	$	2.2		$	(27.7	)	$	(36.8	)	$	(62.3	)

⁽¹⁾All amounts are net of tax. Amounts in parentheses indicate debits.

Equity Investment

As Millennium is an equity method investment, NiSource is required to recognize a proportional share of Millennium’s OCI. The remaining unrecognized loss at March 31, 2014 of $17.4 million, net of tax, related to terminated interest rate swaps is being amortized over the period ending June 2025 into earnings using the effective interest method through interest expense as interest payments are made by Millennium. The unrecognized loss of $17.4 million and $17.7 million at March 31, 2014 and December 31, 2013, respectively, is included in gains and losses on cash flow hedges above.

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Risk Management Activities (Commodity Price Risk Program Derivative Contracted Gross Volumes) (Details)	3 Months Ended	12 Months Ended
	Mar. 31, 2013	Dec. 31, 2013
Gas Price Volatility Program [Member]
Derivative [Line Items]
Commodity price risk program derivative contracted gross volumes, MMDth	13,900,000	17,000,000
Price Protection Service Program [Member]
Derivative [Line Items]
Commodity price risk program derivative contracted gross volumes, MMDth	300,000	700,000
DependaBill Program [Member]
Derivative [Line Items]
Commodity price risk program derivative contracted gross volumes, MMDth	100,000	200,000
Electric Energy Program [Member]
Derivative [Line Items]
Commodity Price Risk Program Derivative Contracted Gross Volumes, mw	0	1,248,000,000

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Supplemental Cash Flow Information (Tables)

3 Months Ended

Mar. 31, 2014

Supplemental Cash Flow Information [Abstract]

Additional Information Regarding Condensed Statements Of Consolidated Cash Flows

	Three Months Ended March 31,
(in millions)	2014		2013
Supplemental Disclosures of Cash Flow Information
Non-cash transactions:
Capital expenditures included in current liabilities	$	131.4	$	114.3
Assets acquired under a capital lease	51.6		2.1
Schedule of interest and income taxes paid:
Cash paid for interest, net of interest capitalized amounts	$	167.7	$	161.8
Cash paid for income taxes	6.8		2.9

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Statements of Consolidated Balance Sheets (USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Property, Plant and Equipment
Utility Plant	$ 23,695.7	$ 23,303.7
Accumulated depreciation and amortization	(9,358.6)	(9,256.5)
Net utility plant	14,337.1	14,047.2
Other property, at cost, less accumulated depreciation	320.6	317.9
Net Property, Plant and Equipment	14,657.7	14,365.1
Investments and Other Assets
Unconsolidated affiliates	407.1	373.7
Other investments	203.1	204.0
Total Investments and Other Assets	610.2	577.7
Current Assets
Cash and cash equivalents	38.0	26.8
Restricted Cash	10.9	8.0
Accounts receivable (less reserve of $34.6 and $23.5, respectively)	1,271.2	1,005.8
Income tax receivable	4.1	5.1
Gas inventory	97.9	354.6
Underrecovered gas and fuel costs	114.3	46.4
Materials and supplies, at average cost	104.8	101.2
Electric production fuel, at average cost	22.9	44.6
Price risk management assets	14.4	22.7
Exchange gas receivable	161.4	70.6
Regulatory assets	159.1	142.8
Prepayments and other	321.1	330.6
Total Current Assets	2,320.1	2,159.2
Other Assets
Regulatory assets	1,494.9	1,522.2
Goodwill	3,666.2	3,666.2
Intangible assets	272.9	275.7
Deferred charges and other	85.3	87.8
Total Other Assets	5,519.3	5,551.9
Total Assets	23,107.3	22,653.9
Common Stockholders' Equity
Common stock - $0.01 par value, 400,000,000 shares authorized; 314,800,122 and 313,675,911 shares outstanding, respectively	3.2	3.2
Additional paid-in capital	4,715.6	4,690.1
Retained earnings	1,394.4	1,285.5
Accumulated other comprehensive loss	(42.5)	(43.6)
Treasury stock	(58.6)	(48.6)
Total Common Stockholders' Equity	6,012.1	5,886.6
Long-term debt, excluding amounts due within one year	7,638.5	7,593.2
Total Capitalization	13,650.6	13,479.8
Current Liabilities
Current portion of long-term debt	530.5	542.1
Short-term borrowings	812.5	698.7
Accounts payable	714.4	619.0
Dividends payable	78.7	0
Customer deposits and credits	239.4	262.6
Taxes accrued	278.6	254.8
Interest accrued	75.3	136.4
Overrecovered gas and fuel costs	25.8	32.2
Exchange gas payable	143.1	186.4
Deferred revenue	7.9	18.5
Regulatory liabilities	79.1	60.2
Accrued liability for postretirement and postemployment benefits	6.2	6.2
Legal and environmental	25.5	32.3
Other accruals	323.8	329.0
Total Current Liabilities	3,340.8	3,178.4
Other Liabilities and Deferred Credits
Deferred income taxes	3,392.3	3,277.8
Deferred investment tax credits	20.0	20.9
Deferred credits	100.2	91.9
Noncurrent deferred revenue	21.8	17.1
Accrued liability for postretirement and postemployment benefits	508.1	527.5
Regulatory liabilities	1,677.6	1,669.8
Asset retirement obligations	176.5	174.4
Other noncurrent liabilities	219.4	216.3
Total Other Liabilities and Deferred Credits	6,115.9	5,995.7
Commitments and Contingencies	0	0
Total Capitalization and Liabilities	$ 23,107.3	$ 22,653.9

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Recent Accounting Pronouncements

3 Months Ended

Mar. 31, 2014

New Accounting Pronouncements and Changes in Accounting Principles [Abstract]

Recent Accounting Pronouncements

Recent Accounting Pronouncements

In April 2014, the FASB issued ASU 2014-08, Presentation of Financial Statements (Topic 205) and Property, Plant, and Equipment (Topic 360): Reporting Discontinued Operations and Disclosures of Disposals of Components of an Entity. ASU 2014-08 changes the criteria for reporting a discontinued operation. Under the new pronouncement, a disposal of a part of an organization that has a major effect on its operations and financial results is a discontinued operation. NiSource is required to adopt ASU 2014-08 prospectively for all disposals or components of its business classified as held for sale during fiscal periods beginning after December 15, 2014. NiSource is currently evaluating what impact, if any, adoption of ASU 2014-08 will have on its Condensed Consolidated Financial Statements (unaudited) and Notes to Condensed Consolidated Financial Statements (unaudited).

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Transfers Of Financial Assets (Schedule Of Gross And Net Receivables Transferred As Well As Short-Term Borrowings Related To The Securitization Transactions) (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Gross Receivables interest	$ 811.7	$ 610.9
Less: Receivables not transferred	296.7	345.8
Net receivables transferred	515.0	265.1
Accounts receivable securitization facility borrowings	$ 515.0	$ 265.1

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Accumulated Other Comprehensive Loss (Narrative) (Details) (Millennium Pipeline Company, L.L.C [Member], USD $) In Millions, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2014	Dec. 31, 2013
Millennium Pipeline Company, L.L.C [Member]
Accumulated Other Comprehensive Loss [Line Items]
Other Comprehensive Income Unrecognized Gain Loss On Derivatives Arising During Period Net Of Tax	$ 17.4	$ 17.7
Debt instrument maturity date	Jun. 01, 2025

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Business Segment Information

3 Months Ended

Mar. 31, 2014

Segment Reporting [Abstract]

Business Segment Information

Business Segment Information

Operating segments are components of an enterprise for which separate financial information is available and evaluated regularly by the chief operating decision maker in deciding how to allocate resources and assess performance. NiSource's Chief Executive Officer is the chief operating decision maker.

At March 31, 2014, NiSource’s operations are divided into three primary business segments. The Gas Distribution Operations segment provides natural gas service and transportation for residential, commercial and industrial customers in Ohio, Pennsylvania, Virginia, Kentucky, Maryland, Indiana and Massachusetts. The Columbia Pipeline Group Operations segment offers gas transportation and storage services for LDCs, marketers and industrial and commercial customers located in northeastern, mid-Atlantic, midwestern and southern states along with unregulated businesses that include midstream services and development of mineral rights positions. The Electric Operations segment provides electric service in 20 counties in the northern part of Indiana.

The following table provides information about business segments. NiSource uses operating income as its primary measurement for each of the reported segments and makes decisions on finance, dividends and taxes at the corporate level on a consolidated basis. Segment revenues include intersegment sales to affiliated subsidiaries, which are eliminated in consolidation. Affiliated sales are recognized on the basis of prevailing market, regulated prices or at levels provided for under contractual agreements. Operating income is derived from revenues and expenses directly associated with each segment.

	Three Months Ended March 31,
(in millions)	2014			2013
REVENUES
Gas Distribution Operations
Unaffiliated	$	1,565.4		$	1,144.9
Intersegment	0.2			0.2
Total	1,565.6			1,145.1
Columbia Pipeline Group Operations
Unaffiliated	303.2			258.4
Intersegment	42.4			43.0
Total	345.6			301.4
Electric Operations
Unaffiliated	450.2			377.4
Intersegment	0.2			0.2
Total	450.4			377.6
Corporate and Other
Unaffiliated	1.7			1.5
Intersegment	126.8			121.7
Total	128.5			123.2
Eliminations	(169.6		)	(165.1		)
Consolidated Gross Revenues	$	2,320.5		$	1,782.2
Operating Income (Loss)
Gas Distribution Operations	$	301.8		$	234.1
Columbia Pipeline Group Operations	158.9			133.5
Electric Operations	78.9			65.2
Corporate and Other	(5.9		)	(3.9		)
Consolidated Operating Income	$	533.7		$	428.9

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Other Commitments And Contingencies (Tables)

3 Months Ended

Mar. 31, 2014

Other Commitments and Contingencies [Abstract]

Schedule of Guarantor Obligations

The total guarantees and indemnities in existence at March 31, 2014 and the years in which they expire were:

(in millions)	Total		2014		2015		2016		2017		2018		After
Guarantees of subsidiaries debt	$	7,710.5	$	500.0	$	230.0	$	616.5	$	507.0	$	800.0	$	5,057.0
Accounts receivable securitization	515.0		515.0		—		—		—		—		—
Lines of credit	297.5		297.5		—		—		—		—		—
Letters of credit	30.5		12.6		17.9		—		—		—		—
Other guarantees	142.4		45.4		35.3		—		—		—		61.7
Total commercial commitments	$	8,695.9	$	1,370.5	$	283.2	$	616.5	$	507.0	$	800.0	$	5,118.7

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Income Taxes

3 Months Ended

Mar. 31, 2014

Income Tax Disclosure [Abstract]

Income Taxes

Income Taxes

NiSource’s interim effective tax rates reflect the estimated annual effective tax rates for 2014 and 2013, adjusted for tax expense associated with certain discrete items. The effective tax rates for the three months ended March 31, 2014 and 2013 were 37.9% and 35.4%, respectively. These effective tax rates differ from the Federal tax rate of 35% primarily due to the effects of tax credits, state income taxes, utility rate-making, and other permanent book-to-tax differences. The 2.5% increase from 2013 to 2014 is primarily due to the impact of the Indiana rate change, see below for further information.

On March 25, 2014, the governor of Indiana signed into law Senate Bill 1, which among other things, lowers the corporate income tax rate from 6.5% to 4.9% over six years beginning on July 1, 2015. The reduction in the tax rate will impact deferred income taxes and tax related regulatory assets and liabilities recoverable in the rate-making process. In addition, other deferred tax assets and liabilities, primarily deferred tax assets related to the Indiana net operating loss carry forward, will be reduced to reflect the lower rate at which these temporary differences and tax benefits will be realized. In the first quarter of 2014, NiSource recorded tax expense of $7.1 million to reflect the effect of this rate change. This expense is largely attributable to the remeasurement of the Indiana net operating loss at the 4.9% rate. The majority of NiSource's tax temporary differences are related to NIPSCO's utility plant. The remeasurement of these temporary differences at 4.9% was recorded as a reduction of a regulatory asset.

On March 7, 2013, the Congressional Joint Committee on Taxation took no exception to the conclusions reached by the IRS in its 2008-2010 audit examination. Therefore, in the first quarter of 2013, NiSource recognized a federal income tax receivable of $15.9 million that was related to the 2008 and 2009 tax years and increases in net operating loss carryforwards of $0.6 million that was related to uncertain tax positions in the 2010-2012 tax years. NiSource received payments of $75.1 million in March 2013 and $70.6 million in April 2013 of principal and interest from the IRS related to the audit examination. The recognition of the receivables and net operating loss carryforwards did not materially affect tax expense or net income.

On January 2, 2013, the President signed into law the American Taxpayer Relief Act of 2012 ("ATRA"). ATRA, among other things, extended retroactively the research credit under Internal Revenue Code section 41 until December 31, 2013, and also extended and modified 50% bonus depreciation for 2013. In general, 50% bonus depreciation will be available for property placed in service before January 1, 2014, or in the case of certain property having longer production periods, before January 1, 2015. NiSource recorded the effects of ATRA in the first quarter of 2013. The retroactive extension of the research credit did not have a significant effect on net income.

There were no material changes recorded in the first quarter of 2014 to NiSource's uncertain tax positions as of December 31, 2013.