10-Q

UNITED STATES SECURITIES AND EXCHANGE COMMISSION

WASHINGTON, D.C. 20549

FORM 10-Q

x QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934

For the quarterly periodended March 31, 2012

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:  000-26091

TC PipeLines, LP

(Exact name of registrant as specified in its charter)

Delaware	52-2135448
(State or other jurisdiction of incorporation or organization)	(I.R.S. Employer Identification Number)

717 Texas Street, Suite 2400 Houston, Texas	77002-2761
(Address of principle executive offices)	(Zip code)

877-290-2772

(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 x                      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).

Yes x                      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. See the definitions of “large accelerated filer,” “accelerated filer” and “smaller reporting company” in Rule 12b-2 of the Exchange Act.

Large accelerated filer x	Accelerated filer ¨
Non-accelerated filer ¨ (Do not check if a smaller reporting company)	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 x

As of April 30, 2012, there were 53,472,766of the registrant’s common units outstanding.

TC PIPELINES, LP

TABLE OF CONTENTS Page No.

PART I	FINANCIAL INFORMATION
Item 1.	Financial Statements	6
Item 2.	Management’s Discussion and Analysis of Financial Condition and Results of Operations	20
Item 3.	Quantitative and Qualitative Disclosures About Market Risk	27
Item 4.	Controls and Procedures	29
PART II	OTHER INFORMATION
Item 1.	Legal Proceedings	29
Item 6.	Exhibits	30

All amounts are stated in United States dollars unless otherwise indicated.

2

DEFINITIONS

The abbreviations, acronyms, and industry terminology used in this quarterly report are defined as follows:

Acquisitions	The acquisition from subsidiaries of TransCanada of a 25 percent membership interest in each of GTN and Bison
ASC	Accounting Standards Codification
Bison	Bison Pipeline LLC
DOT	U.S. Department of Transportation
EPA	U.S. Environmental Protection Agency
FASB	Financial Accounting Standards Board
FERC	Federal Energy Regulatory Commission
GAAP	U.S. generally accepted accounting principles
General Partner	TC PipeLines GP, Inc.
Great Lakes	Great Lakes Gas Transmission Limited Partnership
GTN	Gas Transmission Northwest LLC
GTN Settlement	Stipulation and Agreement of Settlement for GTN regarding its rates and terms and conditions of service
LIBOR	London Interbank Offered Rate
Mainline	TransCanada's Mainline, a natural gas transmission system extending from the Alberta/Saskatchewan border east to Quebec
NGA	Natural Gas Act of 1938
North Baja	North Baja Pipeline, LLC
Northern Border	Northern Border Pipeline Company
Other Pipes	North Baja and Tuscarora
Our pipeline systems	Our ownership interests in Great Lakes, Northern Border, GTN, Bison, North Baja and Tuscarora
Partnership	TC PipeLines, LP and its subsidiaries
Partnership Agreement	Second Amended and Restated Agreement of Limited Partnership
PHMSA	US Department of Transportation Pipeline and Hazardous Materials Safety Administration
SEC	Securities and Exchange Commission
Senior Credit Facility	TC PipeLines, LP’s revolving credit and term loan agreement
TransCanada	TransCanada Corporation and its subsidiaries
Tuscarora	Tuscarora Gas Transmission Company
Tuscarora Settlement	Stipulation and Agreement of Settlement for Tuscarora regarding its rates and terms and conditions of service approved by FERC on March 9, 2012
U.S.	United States of America
WCSB	Western Canada Sedimentary Basin

Unless the context clearly indicates otherwise, TC PipeLines, LP, its subsidiaries and equity investees are collectively referred to in this quarterly report as “we,” “us,” “our” and “the Partnership.”  We use “our pipeline systems” when referring to the Partnership’s ownership interests in Great Lakes Gas Transmission Limited Partnership (Great Lakes), Northern Border Pipeline Company (Northern Border), Gas Transmission Northwest LLC (GTN), Bison Pipeline LLC (Bison), North Baja Pipeline, LLC (North Baja) and Tuscarora Gas Transmission Company (Tuscarora).

3

FORWARD-LOOKING STATEMENTS AND CAUTIONARY STATEMENT REGARDING FORWARD-LOOKING INFORMATION

This report includes certain 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. Forward-looking statements are identified by words and phrases such as: “anticipate,” “estimate,” “expect,” “project,” “intend,” “plan,” “believe,” “forecast,” “should,” “predict,” “could,” “will,” “may,” and other terms and expressions of similar meaning. The absence of these words, however, does not mean that the statements are not forward-looking. These statements are based on management’s beliefs and assumptions and on currently available information and include, but are not limited to, statements regarding anticipated financial performance, future capital expenditures, liquidity, plans and objectives for future operations, organic and strategic growth opportunities, contract renewals and ability to market open capacity, business prospects, outcome of regulatory proceedings, and cash distributions to unitholders.

Forward-looking statements involve known and unknown risks, uncertainties and other factors that could cause actual results to differ materially from future results, performance or achievements expressed or implied in forward-looking statements. Factors that could cause, and in certain instances have caused, actual results to differ materially from those contemplated in forward-looking statements include, but are not limited to:

● the ability of our pipeline systems to generate positive operating cash flows and make cash distributions;

● the ability to sell unsold capacity and renew expiring contracts on our pipeline systems;

● the ability of our pipeline systems to market capacity on favorable terms, which is affected by, among other factors:

o   demand for and prices of natural gas;

o   level of natural gas basis differentials;

o   weather conditions that impact natural gas supply and demand;

o   competitive conditions in the overall natural gas and electricity markets;

o   availability of supplies of Canadian and United States of America (U.S.) natural gas, including the growing supplies of natural gas from shale gas basins such as Horn River and Montney in Western Canada and Appalachian and Barnett in the U.S., and natural gas from conventional basins such as the Western Canada Sedimentary Basin (WCSB), Rocky Mountain, Mid-Continent and Gulf Coast basins;

o   competitive natural gas transmission developments;

o   uncertainty relating to TransCanada’s Mainline (Mainline) rates;

o   the availability of natural gas storage capacity and storage levels;

o   the level of production of natural gas liquids and the subsequent impact on relative competitiveness of gas producing basins; and

o   the ability of shippers to pay including meeting creditworthiness requirements;

●	the costs and impact of changes in laws and governmental regulations affecting our pipeline systems, particularly regulations issued by the Federal Energy Regulatory Commission (FERC), the U.S. Environmental Protection Agency (EPA), U.S. Department of Transportation (DOT) and U.S. DOT Pipeline and Hazardous Materials Safety Administration (PHMSA);
●	the outcome and frequency of rate proceedings on our pipeline systems;
●	changes in relative cost structures and production levels of natural gas producing basins;
●	regulatory, financing, construction and operational risks associated with construction and operation of interstate natural gas pipelines;
●	our ability to identify and complete expansion projects and other accretive growth opportunities;
● ●	the performance by the shippers of their contractual obligations on our pipeline systems; changes in the taxation of limited partnerships by states or the federal government such as the elimination of pass-through taxation and the imposition of entity level taxes;
●	operating hazards, casualty losses and other matters beyond our control; and
●	unfavorable economic conditions and the impact on capital markets.

4

These are not the only factors that could cause actual results to differ materially from those expressed or implied in any forward-looking statement.  Other factors described elsewhere in this document, or factors that are unknown or unpredictable, could also have material adverse effects on future results. These and other risks are described in greater detail in Part I, Item 1A. “Risk Factors” in our Form 10-K for the year ended December 31, 2011. All forward-looking statements attributable to us or persons acting on our behalf are expressly qualified in their entirety by these factors. These forward-looking statements and information are made only as of the date of the filing of this report and except as required by applicable law, we undertake no obligation to update these forward-looking statements and information to reflect new information, subsequent events or otherwise.

5

PART I – FINANCIAL INFORMATION

Item 1.                 Financial Statements

TC PIPELINES, LP

CONSOLIDATED STATEMENT OF INCOME

(unaudited)	Three months ended March 31,
(millions of dollars except per common unit amounts)	2012			2011
Equity earnings from unconsolidated affiliates(a) (Note 3)		38			39
Transmission revenues		16			17
Operating expenses		(4	)		(3	)
General and administrative		(2	)		(2	)
Depreciation		(3	)		(4	)
Financial charges and other		(6	)		(5	)
Net income		39			42
Net income allocation (Note 6)
Common units		38			41
General partner		1			1
		39			42
Net income per common unit (Note 6)		$0.71			$0.90
Weighted average common units outstanding (millions)		53.5			46.2
Common units outstanding, end of quarter (millions)		53.5			46.2

(a) There were no equity earnings from GTN and Bison in the 2011 period as the 25 percent interests in each were acquired in May 2011.

TC PIPELINES, LP

CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME

(unaudited)	Three months ended March 31,
(millions of dollars)	2012		2011
Net income (a)		39		42
Other comprehensive income
Change associated with current period hedging transactions (Note 10)		-		4
Total comprehensive income		39		46

(a) There were no equity earnings from GTN and Bison in the 2011 period as the 25 percent interests in each were acquired in May 2011.

The accompanying notes are an integral part of these consolidated financial statements.

6

TC PIPELINES, LP

CONSOLIDATED BALANCE SHEET

(unaudited)
(millions of dollars)	March 31, 2012			December 31, 2011
Assets
Current Assets
Cash and cash equivalents		5			29
Accounts receivable and other (Note 11)		8			9
		13			38
Investments in unconsolidated affiliates (Note 3)		1,606			1,610
Plant, property and equipment
(Net of $142 accumulated depreciation; 2011 $139)		295			298
Goodwill		130			130
Other assets		6			6
		2,050			2,082
Liabilities and Partners' Equity
Current Liabilities
Accounts payable and accrued liabilities		6			5
Accrued interest		6			1
Current portion of long-term debt (Note 5)		3			3
		15			9
Long-term debt (Note 5)		704			739
Other liabilities		1			1
		720			749
Partners' Equity
Common units		1,304			1,307
General partner		27			27
Accumulated other comprehensive loss		(1	)		(1	)
		1,330			1,333
		2,050			2,082

Subsequent events (Note 14)

The accompanying notes are an integral part of these consolidated financial statements.

7

TC PIPELINES, LP

CONSOLIDATED STATEMENT OF CASH FLOWS

(unaudited)	Three Months ended March 31,
(millions of dollars)	2012			2011
Cash Generated From Operations
Net income (a)		39			42
Depreciation		3			4
Equity earnings in excess of cumulative distributions
from Great Lakes		-			(1	)
Decrease/(increase) in operating working capital (Note 8)		7			(1	)
		49			44
Investing Activities
Cumulative distributions in excess of equity earnings:
Great Lakes		2			-
Northern Border		5			5
Bison(a)		1			-
Investment in Great Lakes (Note 3)		(4	)		(4	)
Capital expenditures		-			(2	)
		4			(2	)
Financing Activities
Distributions paid (Note 7)		(42	)		(35	)
Long-term debt repaid (Note 5)		(35	)		(8	)
		(77	)		(43	)
Decrease in cash and cash equivalents		(24	)		(1	)
Cash and cash equivalents, beginning of period		29			4
Cash and cash equivalents, end of period		5			3

(a) There were no equity earnings from GTN and Bison in the 2011 period as the 25 percent interests in each were acquired in May 2011.

The accompanying notes are an integral part of these consolidated financial statements.

8

TC PIPELINES, LP

CONSOLIDATED STATEMENT OF CHANGES IN PARTNERS’ EQUITY

(unaudited)	Common Units					General Partner			Accumulated Other Comprehensive Loss			Partners' Equity
	(millions		(millions			(millions			(millions			(millions		(millions
	of units)		of dollars)			of dollars)			of dollars)			of units)		of dollars)
Partners' equity at December 31, 2011		53.5		1,307			27			(1	)		53.5		1,333
Net income				38			1								39
Distributions paid				(41	)		(1	)							(42	)
Partners' equity at March 31, 2012		53.5		1,304			27			(1	)		53.5		1,330

The accompanying notes are an integral part of these consolidated financial statements.

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TC PIPELINES, LP

NOTES TO CONSOLIDATED FINANCIAL STATEMENTS

NOTE 1                 ORGANIZATION

TC PipeLines, LP and its subsidiaries are collectively referred to herein as the Partnership. The Partnership was formed by TransCanada PipeLines Limited, a wholly-owned subsidiary of TransCanada Corporation (TransCanada Corporation together with its subsidiaries collectively referred to herein as TransCanada), to acquire, own and participate in the management of energy infrastructure assets in North America.

NOTE 2                 SIGNIFICANT ACCOUNTING POLICIES

(a) Basis of Presentation

The results of operations for the three months ended March 31, 2012 and 2011 are not necessarily indicative of the results that may be expected for a full fiscal year. The unaudited interim financial statements should be read in conjunction with the financial statements and notes thereto included in our Annual Report on Form 10-K for the year ended December 31, 2011. That report contains a more comprehensive summary of the Partnership’s major accounting policies. In the opinion of management, the accompanying unaudited condensed consolidated financial statements contain all of the appropriate adjustments, all of which are normally recurring adjustments unless otherwise noted, considered necessary to present fairly the financial position of the Partnership, the results of operation and cash flows for the respective periods. Our significant accounting policies are consistent with those disclosed in Note 2 of the financial statements in our Annual Report on Form 10-K for the year ended December 31, 2011. Certain items from that Note are repeated or updated below as necessary to assist in understanding these financial statements.

Amounts are stated in U.S. dollars.

(b) Acquisitions

On May 3, 2011, the Partnership acquired a 25 percent membership interest in each of GTN and Bison from subsidiaries of TransCanada (Acquisitions). The Acquisitions were accounted for as transactions between entities under common control, whereby the equity investments in GTN and Bison were recorded at TransCanada’s carrying values. See Note 4 for additional disclosure regarding the Acquisitions.

 (c) Use of Estimates

The preparation of financial statements in conformity with United States of America (U.S.) generally accepted accounting principles (GAAP) requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities as of the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Although management believes these estimates are reasonable, actual results could differ from these estimates. In the opinion of management, these consolidated financial statements have been properly prepared within reasonable limits of materiality and include all adjustments (consisting of normal recurring accruals) necessary for a fair presentation of the financial results for the periods presented.

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NOTE 3                 INVESTMENTS IN UNCONSOLIDATED AFFILIATES

Great Lakes, Northern Border, GTN and Bison are regulated by the Federal Energy Regulatory Commission (FERC) and are operated by TransCanada. We use the equity method of accounting for our interests in our equity investees.

	Ownership Interest at March 31, 2012			Equity Earnings from Unconsolidated Affiliates					Investment in Unconsolidated Affiliates
(unaudited)				Three Months Ended March 31,				March 31,			December 31,
(millions of dollars)				2012		2011			2012		2011
Great Lakes		46.45	%		9		18			688		686
Northern Border(a)		50	%		20		21			531		536
GTN(b)		25	%		6		-			225		225
Bison(b)		25	%		3		-			162		163
					38		39			1,606		1,610

(a)Equity earnings from Northern Border is net of the 12-year amortization of a $10 million transaction fee paid to the operator of Northern Border at the time of the Partnership’s additional 20 percent interest acquisition in April 2006.

(b) There were no equity earnings from GTN and Bison in the 2011 period as the 25 percent interests in each were acquired in May 2011.

Great Lakes

The Partnership made an equity contribution to Great Lakes of $4 million in the first quarter of 2012. This amount represents the Partnership’s 46.45 percent share of a $9 million cash call from Great Lakes to make a scheduled debt repayment.

The Partnership recorded no undistributed earnings from Great Lakes for the three months ended March 31, 2012 and 2011.

The summarized financial information for Great Lakes is as follows:

(unaudited)	March 31,		December 31,
(millions of dollars)	2012		2011
Assets
Current assets		65		65
Plant, property and equipment, net		819		826
Other assets		1		1
		885		892
Liabilities and Partners' Equity
Current liabilities		26		30
Deferred credits		1		-
Long-term debt, including current maturities		364		373
Partners' capital		494		489
		885		892

(unaudited)	Three months ended March 31,
(millions of dollars)	2012			2011
Transmission revenues		49			70
Operating expenses		(15	)		(14	)
Depreciation		(8	)		(8	)
Financial charges and other		(7	)		(7	)
Michigan business tax		-			(2	)
Net income		19			39

11

Northern Border

The Partnership recorded no undistributed earnings from Northern Border for the three months ended March 31, 2012 and 2011.

The summarized financial information for Northern Border is as follows:

(unaudited)	March 31,			December 31,
(millions of dollars)	2012			2011
Assets
Cash and cash equivalents		39			33
Other current assets		37			35
Plant, property and equipment, net		1,255			1,267
Other assets		30			31
		1,361			1,366
Liabilities and Partners' Equity
Current liabilities		51			48
Deferred credits and other		14			13
Long-term debt, including current maturities		473			473
Partners' equity
Partners' capital		826			835
Accumulated other comprehensive loss		(3	)		(3	)
		1,361			1,366

(unaudited)	Three months ended March 31,
(millions of dollars)	2012			2011
Transmission revenues		81			80
Operating expenses		(18	)		(17	)
Depreciation		(16	)		(15	)
Financial charges and other		(6	)		(6	)
Net income		41			42

GTN

On May 3, 2011, the Partnership acquired a 25 percent interest in GTN from a subsidiary of TransCanada. The acquisition was accounted for as a transaction between entities under common control, whereby the equity investment in GTN was recorded at TransCanada’s carrying value. See Note 4 for additional disclosure regarding the Acquisitions.

In November 2011, the FERC approved a Stipulation and Agreement of Settlement for GTN (GTN Settlement) with shippers and regulators regarding rates and terms and conditions of service without modification, effective January 1, 2012. The GTN Settlement includes a moratorium on the filing of future rate proceedings until December 31, 2015. Following the expiration of the moratorium, GTN must file a rate case such that the new rates will be effective January 1, 2016.

The Partnership recorded no undistributed earnings from GTN for the three months ended March 31, 2012.

12

The summarized financial information for GTN is as follows:

(unaudited)	March 31,		December 31,
(millions of dollars)	2012		2011
Assets
Current assets		66		55
Plant, property and equipment, net		1,197		1,207
Other assets		2		1
		1,265		1,263
Liabilities and Members' Equity
Current liabilities		18		18
Deferred credits and other		20		20
Long-term debt, including current maturities		325		325
Members' capital		902		900
		1,265		1,263

(unaudited)	Three months ended March 31,
(millions of dollars)		2012(a)
Transmission revenues			52
Operating expenses			(11	)
Depreciation			(13	)
Financial charges and other			(5	)
Net income			23

(a) Comparative information not shown as GTN was not acquired until May 2011.

Bison

On May 3, 2011, the Partnership acquired a 25 percent interest in Bison from a subsidiary of TransCanada. The acquisition was accounted for as a transaction between entities under common control, whereby the equity investment in Bison was recorded at TransCanada’s carrying value. See Note 4 for additional disclosure regarding the Acquisitions.

The Partnership recorded no undistributed earnings from Bison for the three months ended March 31, 2012.

13

The summarized financial information for Bison is as follows:

(unaudited)	March 31,		December 31,
(millions of dollars)	2012		2011
Assets
Current assets		7		10
Plant, property and equipment, net		656		658
		663		668
Liabilities and Members' Equity
Current liabilities		15		17
Members' capital		648		651
		663		668

(unaudited)	Three months ended March 31,
(millions of dollars)		2012(a)
Transmission revenues			20
Operating expenses			(3	)
Depreciation			(5	)
Net income			12

(a) Comparative information not shown as Bison was not acquired until May 2011.

NOTE 4                 ACQUISITIONS

GTN and Bison Equity Investment Acquisitions

On May 3, 2011, the Partnership acquired 25 percent interests in each of GTN and Bison from subsidiaries of TransCanada.

The total purchase price of the Acquisitions was $605 million (the Purchase Price). The Purchase Price consisted of (i) $405 million for the GTN membership interest (less $81 million, which reflected 25 percent of GTN’s outstanding debt at the time of the acquisition), (ii) $200 million for the membership interest in Bison (less a $9 million future capital commitment to complete the Bison pipeline) (iii) $23 million at closing and (iv) $1 million in working capital adjustments paid in the fourth quarter of 2011. The resulting $539 million paid by the Partnership was financed through a combination of (i) an issuance of 7,245,000 common units offered to the public at $47.58 per common unit resulting in net proceeds of $331 million, (ii) a draw of $61 million on the Partnership’s committed $400 million bridge loan facility, (iii) a draw of $125 million on the Partnership’s then existing $250 million senior revolving credit facility, (iv) a capital contribution from TC PipeLines, GP Inc. (General Partner) of $7 million, which was required to maintain the General Partner’s effective two percent general partner interest in the Partnership, and (v) approximately $15 million of cash on hand.

The Acquisitions were accounted for as transactions between entities under common control, whereby the equity investments in both GTN and Bison were recorded at TransCanada’s carrying values and the total excess purchase price paid was recorded as a reduction to Partners’ Equity.

Yuma Lateral Asset Acquisition

Pursuant to an amendment to the acquisition agreement between the Partnership and TransCanada relating to the Partnership’s acquisition of North Baja, the Partnership agreed to make an additional payment of up to $2 million to TransCanada in the event that TransCanada secured additional contracts for transportation service before December 31, 2010. TransCanada secured an additional contract in July 2010 and, as a result, the Partnership paid $2 million to TransCanada on March 25, 2011 when the facilities associated with the contract were completed.

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NOTE 5                 CREDIT FACILITIES AND LONG-TERM DEBT

(unaudited)	March 31,		December 31,
(millions of dollars)	2012		2011
Senior Credit Facility due 2016		328		363
4.65% Senior Notes due 2021		349		349
6.89% Series C Senior Notes due 2012		3		3
3.82% Series D Senior Notes due 2017		27		27
		707		742
Less: current portion of long-term debt		3		3
		704		739

The Partnership’s Senior Credit Facility consists of a $500 million senior revolving credit facility with a banking syndicate, maturing July 13, 2016, under which $328 million was outstanding at March 31, 2012 (December 31, 2011 - $363 million), leaving $172 million available for future borrowing.

The London Interbank Offered Rate (LIBOR) based interest rate on the Senior Credit Facility averaged 1.65 percent for the three months ended March 31, 2012. The interest rate was 1.63 percent at March 31, 2012.

The LIBOR-based interest rate on the Senior Credit Facility averaged 0.83 percent for the three months ended March 31, 2011. After hedging activity, the LIBOR-based interest rate incurred on the Senior Credit Facility averaged 4.01 percent for the three months ended March 31, 2011. Prior to hedging activities, the LIBOR-based interest rate was 0.79 percent at March 31, 2011.

At March 31, 2012, the Partnership was in compliance with its financial covenants, in addition to the other covenants which include restrictions on entering into mergers, consolidations and sales of assets, granting liens, material amendments to the Partnership Agreement, incurring additional debt and distributions to unitholders.

The principal repayments required on the long-term debt are as follows:

(unaudited)
(millions of dollars)
2012	3
2013	3
2014	4
2015	4
2016	332
Thereafter	361
	707

NOTE 6                 NET INCOME PER COMMON UNIT

Net income per common unit is computed by dividing net income, after deduction of the General Partner’s allocation, by the weighted average number of common units outstanding. The General Partner’s allocation is equal to an amount based upon the General Partner’s effective two percent general partner interest, plus an amount equal to incentive distributions. Incentive distributions are paid to the General Partner if quarterly cash distributions on the common units exceed levels specified in the Partnership Agreement.

15

Net income per common unit was determined as follows:

(unaudited)	Three months ended March 31,
(millions of dollars, except per unit)	2012			2011
Net income(a)		39			42
Net income allocated to General Partner		(1	)		(1	)
Net income allocable to common units		38			41
Weighted average common units outstanding (millions)		53.5			46.2
Net income per common unit		$0.71			$0.90

(a) There were no equity earnings from GTN and Bison in the 2011 period as the 25 percent interests in each were acquired in May 2011.

NOTE 7                 CASH DISTRIBUTIONS

For the three months ended March 31, 2012, the Partnership distributed $0.77 per common unit (2011 – $0.75 per common unit) for a total of $42 million. The distributions paid for the three months ended March 31, 2012 and 2011 included no incentive distributions to the General Partner.

NOTE 8                 CHANGE IN WORKING CAPITAL

(unaudited)	Three months ended March 31,
(millions of dollars)	2012		2011
Decrease in accounts receivable and other		1		-
Increase/(decrease) in accounts payable and accrued liabilities		1		(2	)
Increase in accrued interest		5		1
Decrease/(increase) in operating working capital		7		(1	)

NOTE 9                 RELATED PARTY TRANSACTIONS

The Partnership does not have any employees. The management and operating functions are provided by the General Partner. The General Partner does not receive a management fee in connection with its management of the Partnership. The Partnership reimburses the General Partner for all costs of services provided, including the costs of employee, officer and director compensation and benefits, and all other expenses necessary or appropriate to the conduct of the business of, and allocable to, the Partnership. Such costs include (i) overhead costs (such as office space and equipment) and (ii) out-of-pocket expenses related to the provision of such services. The Partnership Agreement provides that the General Partner will determine the costs that are allocable to the Partnership in any reasonable manner determined by the General Partner in its sole discretion. Total costs charged to the Partnership by the General Partner were $1 million for the three months ended March 31, 2012 (2011 – $1 million).

As operator, TransCanada’s subsidiaries provide capital and operating services to our pipeline systems. TransCanada’s subsidiaries incur costs on behalf of our pipeline systems, including, but not limited to, employee salary and benefit costs, and property and liability insurance costs.

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Capital and operating costs charged to our pipeline systems for the three months ended March 31, 2012 and 2011 by TransCanada’s subsidiaries and amounts payable to TransCanada’s subsidiaries at March 31, 2012 and December 31, 2011 are summarized in the following tables:

(unaudited)	Three months ended March 31,
(millions of dollars)	2012		2011
Capital and operating costs charged by TransCanada's subsidiaries to:
Great Lakes(a)		8		8
Northern Border(a)		8		7
GTN(a)(b)		7		-
Bison(a)(b)		2		-
North Baja		1		1
Tuscarora		1		1
Impact on the Partnership's net income:
Great Lakes(a)		4		4
Northern Border(a)		4		3
GTN(a)(b)		7		-
Bison(a)(b)		1		-
North Baja		1		1
Tuscarora		1		1

(a) Represents 100 percent of the costs.

(b) There were no amounts from GTN and Bison in the 2011 period as the 25 percent interests in each were acquired in May 2011.

(unaudited)	March 31,		December 31,
(millions of dollars)		2012		2011
Amount payable to TransCanada's subsidiaries for costs charged in the year by:
Great Lakes(a)		3		3
Northern Border(a)		3		3
GTN(a)		3		3
Bison(a)		1		1
North Baja		-		1
Tuscarora		-		1

(a) Represents 100 percent of the costs.

Great Lakes earns transportation revenues from TransCanada and its affiliates under contracts, some of which are provided at discounted rates and some at maximum recourse rates. The contracts have remaining terms ranging from one to six years. Great Lakes earned $24 million of transportation revenues under these contracts in the three months ended March 31, 2012 (2011 - $24 million). This amount represents 48 percent of total revenues earned by Great Lakes in the three months ended March 31, 2012 (2011 – 35 percent).

Revenue from TransCanada and its affiliates of $11 million is included in the Partnership’s equity earnings from Great Lakes in the three months ended March 31, 2012 (2011 - $11 million). At March 31, 2012, $8 million was included in Great Lakes’ receivables in regards to the transportation contracts with TransCanada and its affiliates (December 31, 2011 - $7 million).

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NOTE 10                      FINANCIAL INSTRUMENTS

The carrying value of cash and cash equivalents, accounts receivable and other, accounts payable and accrued liabilities, and accrued interest approximate their fair values because of the short maturity or duration of these instruments, or because the instruments bear a variable rate of interest or a rate that approximates current rates. The fair value of the Partnership’s long-term debt is estimated by discounting the future cash flows of each instrument at estimated current borrowing rates. The estimated fair values of the Partnership’s and its subsidiary’s long-term debt as of March 31, 2012 is $723 million (December 31, 2011 - $763 million).

The Partnership’s long-term debt results in exposures to changing interest rates. Until December 12, 2011, the Partnership used derivatives to assist in managing its exposure to interest rate risk. For the three months ended March 31, 2012, the Partnership recorded interest expense of nil on interest rate swaps and options (2011 – $4 million).

NOTE 11                      ACCOUNTS RECEIVABLE AND OTHER

(unaudited)	March 31,		December 31,
(millions of dollars)	2012		2011
Accounts receivable		7		8
Inventory		1		1
		8		9

NOTE 12                      REGULATORY MATTERS

Tuscarora – On March 9, 2012, Tuscarora received approval from the FERC of the Stipulation and Agreement of Settlement (Tuscarora Settlement). The Tuscarora Settlement includes three-year contract extensions to the term of a number of contracts with Tuscarora’s largest customer, provides for new rates effective January 1, 2012, and a moratorium on the filing of future rate proceedings under NGA Sections 4 or 5 until December 31, 2014.  Pursuant to the Tuscarora Settlement, Tuscarora will have no future obligation to file a Section 4 rate case.

NOTE 13                      ACCOUNTING PRONOUNCEMENTS

The Financial Accounting Standards Board (FASB) issued an update to Accounting Standards Codification (ASC) 350 - Intangibles - Goodwill and Other.  Adoption of this update has resulted in a change in the accounting policy related to testing goodwill for impairment, as the Partnership is now permitted under U.S. GAAP to first assess qualitative factors affecting the fair value of a reporting unit in comparison to the carrying amount as a basis for determining whether it is required to proceed to the two-step quantitative impairment test. The Partnership adopted this update effective January 1, 2012. The adoption of this update is not expected to have an impact on our annual goodwill assessment.

NOTE 14                      SUBSEQUENT EVENTS

On April 24, 2012, the board of directors of our General Partner declared the Partnership’s first quarter 2012 cash distribution in the amount of $0.77 per common unit payable on May 15, 2012 to unitholders of record as of May 4, 2012.

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Great Lakes declared its first quarter 2012 distribution of $27 million on April 20, 2012, of which the Partnership will receive its 46.45 percent share or $12 million on May 1, 2012.

Northern Border declared its first quarter 2012 distribution of $52 million on April 20, 2012, of which the Partnership will receive its 50 percent share or $26 million on May 1, 2012.

GTN declared its first quarter 2012 distribution of $33 million on April 20, 2012, of which the Partnership will receive its 25 percent share or $8 million on May 1, 2012.

Bison declared its first quarter 2012 distribution of $17 million on April 20, 2012, of which the Partnership will receive its 25 percent share or $4 million on May 1, 2012.

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Item 2.                 Management’s Discussion and Analysis of Financial Condition and Results of Operations

The following discussion and analysis should be read in conjunction with the unaudited financial statements and notes included in Item 1. “Financial Statements” of this Quarterly Report on Form 10-Q as well as our Annual Report on Form 10-K for the year ended December 31, 2011.

RECENT DEVELOPMENTS

On April 24, 2012, the board of directors of our General Partner declared the Partnership’s first quarter 2012 cash distribution in the amount of $0.77 per common unit, payable on May 15, 2012 to unitholders of record as of May 4, 2012.

Consistent with the results we experienced in November and December 2011, during first quarter 2012, Great Lakes was unable to market all of its available long-haul capacity, which historically has been fully sold by the first quarter. During the first quarter, an average of 440 thousand dekatherms per day or 28 percent of Great Lakes’ available annual long-haul capacity went unsold. As a result of the unsold winter capacity, Great Lakes’ transmission revenue for the first quarter of 2012 was $21 million lower than the same period in 2011. This resulted in a $9 million reduction to the Partnership’s equity earnings in first quarter 2012 compared to first quarter 2011. Great Lakes is fully contracted for its long-haul capacity through the 2012 summer season of April 1, 2012 to October 31, 2012. The capacity under those contracts, however, was sold at lower rates relative to the same period in 2011.

On March 9, 2012, Tuscarora received FERC approval of the Tuscarora Settlement effective January 1, 2012. Compared to 2011, the Tuscarora Settlement will reduce Tuscarora’s cash flows by approximately $6 million. Net income will be reduced by $3 million as a result of the lower revenue offset by lower depreciation expense.

Northern Border’s long-haul capacity is substantially contracted through March 2013. Despite the warm winter and low basis differentials across North America, Northern Border has successfully negotiated contract extensions for substantially all of the Canada to Ventura contracts that expire in 2012. The majority of these extensions were for terms of three years or longer.

Customers and Contracting

As of April 1, 2012, the following table provides information with respect to the contract profile of our pipeline systems over the next five years calculated as a percentage of the Partnership’s total proportionate share of 2011 revenue from each of our pipeline systems, being $387 million:

	Percent of 2011 revenue underpinned by long-term contracts
2012	84%
2013	62%
2014	54%
2015	49%
2016	43%

Our pipeline systems generally sell capacity under contracts under which shippers are obligated to pay for their contracted capacity regardless of utilization.

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Outlook of Our Business

Great Lakes has historically been fully contracted for long-term, long-haul capacity but due to current market conditions, the composition of Great Lakes’ revenue is changing as it re-contracts for short-term, short-haul and bidirectional transportation; a trend which management expects  to continue. Great Lakes is fully contracted for its long-haul capacity through the current summer season, which ends October 31, 2012. These rates, however, have been discounted. As a result, Great Lakes’ transmission revenue for each of the second and third quarters in 2012 is expected to be approximately $9 million to $12 million lower than 2011. Great Lakes' lower transmission revenue is expected to reduce the Partnership’s equity earnings by approximately $4 million to $6 million for each of the second and third quarters of 2012 compared to 2011. Currently, 22 percent of Great Lakes’ long-haul capacity available at November 1, 2012 is contracted, although at less than maximum rates. Great Lakes’ ability to sell its available and future capacity will depend on future market conditions which are impacted by a number of factors including, weather for winter 2012/2013, levels of natural gas in storage, the price of natural gas liquids and the associated impact to North American natural gas production and the level of TransCanada’s Mainline tolls. These factors could negatively impact our fourth quarter 2012 earnings.

The results from the ownership interests in the other pipelines in our portfolio continue to be relatively consistent year over year reflecting the longer term contract status and recent regulatory settlements.

REGULATORY ENVIRONMENT

Tuscarora – On March 9, 2012, Tuscarora received approval from the FERC for the Tuscarora Settlement. The Tuscarora Settlement includes three-year contract extensions to the term of a number of contracts with Tuscarora’s largest customer, provides for new rates effective January 1, 2012, and a moratorium on the filing of future rate proceedings under NGA Sections 4 or 5 until December 31, 2014. Pursuant to the Tuscarora Settlement, Tuscarora will have no future obligation to file a Section 4 rate case.

HOW WE EVALUATE OUR OPERATIONS

We evaluate our business primarily on the basis of the underlying operating results for each of our pipeline systems, along with a measure of Partnership cash flows. This measure does not have any standardized meaning prescribed by U.S. generally accepted accounting principles (GAAP). It is, therefore, considered to be a non-GAAP measure and is unlikely to be comparable to similar measures presented by other entities. Partnership cash flows include cash distributions from the Partnership’s equity investments, Great Lakes, Northern Border, GTN and Bison plus operating cash flows from the Partnership’s wholly-owned subsidiaries, North Baja and Tuscarora, net of Partnership costs and distributions declared to the General Partner. 

RESULTS OF OPERATIONS

Critical Accounting Policies and Estimates

The preparation of financial statements in accordance with GAAP requires us to make estimates and assumptions with respect to values or conditions, which cannot be known with certainty, that affect the reported amount of assets and liabilities and the disclosure of contingent assets and liabilities at the date of the financial statements. Such estimates and assumptions also affect the reported amounts of revenue and expenses during the reporting period. Although we believe these estimates and assumptions are reasonable, actual results could differ. There were no significant changes to the Partnership’s critical accounting policies and estimates during the three months ended March 31, 2012.

Information about our critical accounting policies and estimates is included under Item 7. “Management's Discussion and Analysis of Financial Condition and Results of Operations,” in our Annual Report on Form 10-K for the year ended December 31, 2011.

Accounting Pronouncements

Effective January 1, 2012, the Partnership adopted Accounting Standards Codification (ASC) 350 – Intangibles – Goodwill and Other on testing goodwill for impairment as issued by the Financial Accounting Standards Board (FASB).  Adoption of ASC 350 has resulted in a change in the accounting policy related to testing goodwill for impairment, as the company is now permitted under U.S. GAAP to first assess qualitative factors affecting the fair value of a reporting unit in comparison to the carrying amount as a basis for determining whether it is required to proceed to the two-step quantitative impairment test.

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Net Income

To supplement our financial statements, we have presented a comparison of the earnings contribution components from each of our investments. We have presented earnings in this format to enhance investors’ understanding of the way management analyzes our financial performance. We believe this summary provides a more meaningful comparison of our current period earnings to prior year periods, as we account for our partially-owned pipeline systems using the equity method. The presentation of this additional information is not meant to be considered in isolation or as a substitute for results prepared in accordance with GAAP.

(unaudited)	Three months ended March 31,
(millions of dollars)	2012			2011
Equity earnings:
Great Lakes		9			18
Northern Border		20			21
GTN(a)		6			-
Bison(a)		3			-
Net income from Other Pipes(b)		9			10
Partnership expenses		(8	)		(7	)
Net Income		39			42

(a) There were no equity earnings from GTN and Bison in the 2011 period as the 25 percent interests in each were acquired in May 2011.

(b) “Other Pipes” includes the results of North Baja and Tuscarora.

First Quarter 2012 Compared with First Quarter 2011

Net income decreased $3 million to $39 million in the first quarter of 2012 compared to $42 million in the same period in 2011. This decrease was primarily due to lower equity earnings from Great Lakes, offset by earnings from the 25 percent interests in GTN and Bison, which were acquired in May 2011.

Equity earnings from Great Lakes were $9 million in the first quarter of 2012, a decrease of $9 million compared to $18 million earned in the first quarter of 2011. This decrease was primarily due to lower transportation revenue due to lack of re-marketing long-term, long-haul capacity.

LIQUIDITY AND CAPITAL RESOURCES

Overview

Our principal sources of liquidity include distributions received from our investments in unconsolidated affiliates, operating cash flows from North Baja and Tuscarora, public offerings of debt and equity and our bank credit facility. The Partnership funds its operating expenses, debt service and cash distributions primarily with operating cash flow.  Long-term capital needs may be met through the issuance of long-term debt and/or equity.

Our pipeline systems’ principal sources of liquidity are cash generated from operating activities, long-term debt offerings, bank credit facilities and equity contributions from their partners. Our pipeline systems have historically funded operating expenses, debt service and cash distributions to partners primarily with operating cash flow. However, in fourth quarter 2010, Great Lakes started funding its debt repayments with cash calls to its partners.

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Capital expenditures are funded by a variety of sources, including cash generated from operating activities, borrowings under bank credit facilities, issuance of senior unsecured notes or equity contributions from our pipeline systems’ partners. The ability of our pipeline systems to access the debt capital markets under reasonable terms depends on their financial position and general market conditions.

The Partnership’s pipeline systems monitor the creditworthiness of their customers and have credit provisions included in their tariffs, which allow them to request credit support as circumstances dictate.

We expect to be able to fund our liquidity requirements over the next twelve months. We believe that our pipeline systems’ ability to obtain financing at reasonable rates, together with their history of consistent cash flow from operating activities, provide a solid foundation to meet their future liquidity and capital resource requirements. The reduction in long-term firm contracts underpinning revenues on Great Lakes beyond 2012 is consistent with the industry trend towards short-term contracting, and may result in lower or volatile operating cash flow from Great Lakes. This may impact Great Lakes’ ability to fund its liquidity requirements including making distributions to its partners. Management cannot reasonably estimate the impact this will have on long-term cash flows.

Partnership Cash Flows

The Partnership uses the non-GAAP financial measures “Partnership cash flows” and “Partnership cash flows before General Partner distributions” as they provide a measure of cash generated during the period to evaluate our cash distribution capability. As well, management uses these measures as a basis for recommendations to our General Partner’s board of directors regarding the distribution amount to be declared each quarter. Partnership cash flow information is presented to enhance investors’ understanding of the way that management analyzes the Partnership’s financial performance.

The Partnership calculates Partnership cash flows as net income plus operating cash flows from the Partnership’s wholly-owned subsidiaries, North Baja and Tuscarora, and cash distributions received in excess of equity earnings  from the Partnership’s equity investments, Great Lakes, Northern Border, GTN and Bison, net of distributions declared to the General Partner. Partnership cash flows before General Partner distributions represent Partnership cash flows prior to distributions declared to the General Partner.

Partnership cash flows and Partnership cash flows before General Partner distributions are provided as a supplement to GAAP financial results and are not meant to be considered in isolation or as substitutes for financial results prepared in accordance with GAAP.

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Non-GAAP Measures

Reconciliations of Net Income to Partnership Cash Flows

(unaudited)	Three months ended March 31,
(millions of dollars except per common unit amounts)	2012			2011
Net income(a)		39			42
Add:
Cash distributions from Great Lakes(b)		11			17
Cash distributions from Northern Border(b)		25			26
Cash distributions from GTN(b)		5			-
Cash distributions from Bison(b)		4			-
Cash flows provided by Other Pipes' operating activities		14			13
		59			56
Less:
Equity earnings from unconsolidated affiliates		(38	)		(39	)
Other Pipes' net income		(9	)		(10	)
		(47	)		(49	)
Partnership cash flows before General Partner distributions		51			49
General Partner distributions(c)		(1	)		(1	)
Partnership cash flows		50			48
Cash distributions declared		(42	)		(35	)
Cash distributions declared per common unit(d)	$	0.77		$	0.75
Cash distributions paid		(42	)		(35	)
Cash distributions paid per common unit(d)	$	0.77		$	0.75

(a) There were no equity earnings from GTN and Bison in the 2011 period as the 25 percent interests in each were acquired in May 2011.

(b) In accordance with the cash distribution policies of the respective pipeline systems, cash distributions from Great Lakes, Northern Border, GTN and Bison are based on their respective prior quarter financial results.

(c) General Partner distributions represent the cash distributions declared to the General Partner with respect to its two percent interest plus an amount equal to incentive distributions. Incentive distributions in the first quarter of 2012 and 2011 were nil.

(d) Cash distributions declared per common unit and cash distributions paid per common unit are computed by dividing cash distributions, after the deduction of the General Partner's allocation, by the number of common units outstanding. The General Partner's allocation is computed based upon the General Partner's two percent interest plus an amount equal to incentive distributions.

First Quarter 2012 Compared with First Quarter 2011

Partnership cash flows increased $2 million to $50 million in the first quarter of 2012 compared to $48 million in the same period of 2011. This increase was primarily due to cash distributions of $9 million from the 25 percent interests in each of GTN and Bison, which were acquired in May 2011, partially offset by decreased cash distributions from Great Lakes of $6 million.

The Partnership paid distributions of $42 million in the first quarter of 2012, an increase of $7 million compared to the same period in 2011 due to an increase in the number of common units outstanding and an increase in the quarterly distribution of $0.02 per common unit paid beginning in the third quarter of 2011.

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Other Cash Flows

On March 23, 2012, the Partnership made an equity contribution of $4 million to Great Lakes that was used to fund debt repayments.

Contractual Obligations

The Partnership’s contractual obligations related to debt as of March 31, 2012 included the following:

	Payments Due by Period
(millions of dollars)	Total	Less than 1 Year	Long-term Portion
Senior Credit Facility due 2016	328	-	328
4.65% Senior Notes due 2021	349	-	349
6.89% Series C Senior Notes due 2012	3	3	-
3.82% Series D Senior Notes due 2017	27	-	27
	707	3	704

The Partnership’s Senior Credit Facility consists of a $500.0 million senior revolving credit facility with a banking syndicate, maturing July 13, 2016, under which $328 million was outstanding at March 31, 2012 (December 31, 2011 - $363 million), leaving $172 million available for future borrowing.

The LIBOR-based interest rate on the Senior Credit Facility averaged 1.65 percent for the three months ended March 31, 2012. The LIBOR-based interest rate was 1.63 percent at March 31, 2012.

The LIBOR-based interest rate on the Senior Credit Facility averaged 0.83 percent for the three months ended March 31, 2011. After hedging activity, the LIBOR-based interest rate incurred on the Senior Credit Facility averaged 4.01 percent for the three months ended March 31, 2011. Prior to hedging activities, the LIBOR-based interest rate was 0.79 percent at March 31, 2011.

At March 31, 2012, the Partnership was in compliance with its financial covenants, in addition to the other covenants which include restrictions on entering into mergers, consolidations and sales of assets, granting liens, material amendments to the Partnership Agreement, incurring additional debt and distributions to unitholders.

Series C and D Senior Notes are secured by Tuscarora’s transportation contracts, supporting agreements and substantially all of Tuscarora’s property. The note purchase agreements contain certain provisions that include, among other items, limitations on additional indebtedness and distributions to partners.

The Partnership’s long-term debt results in exposures to changing interest rates. Until December 12, 2011, the Partnership used derivatives to assist in managing its exposure to interest rate risk. For the three months ended March 31, 2012, the Partnership recorded interest expense of nil on interest rate swaps and options (2011 – $4 million).

Great Lakes’ contractual obligations related to debt as of March 31, 2012 included the following:

	Payments Due by Period
(millions of dollars)	Total	Less than 1 Year	Long-term Portion
6.73% series Senior Notes due 2013 to 2018	54	9	45
9.09% series Senior Notes due 2012 to 2021	100	10	90
6.95% series Senior Notes due 2019 to 2028	110	-	110
8.08% series Senior Notes due 2021 to 2030	100	-	100
	364	19	345

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Great Lakes is required to comply with certain financial, operational and legal covenants. Under the most restrictive covenants in the Senior Note Agreements, approximately $196 million of Great Lakes’ partners’ capital was restricted as to distributions as of March 31, 2012 (December 31, 2011 – $201 million). Great Lakes was in compliance with all of its financial covenants at March 31, 2012.

Northern Border’s contractual obligations related to debt as of March 31, 2012 included the following:

	Payments Due by Period
(millions of dollars)	Total	Less than 1 Year	Long-term Portion
6.24% Senior Notes due 2016	100	-	100
7.50% Senior Notes due 2021	250	-	250
$200 million Credit Agreement due 2016	123	-	123
	473	-	473

As of March 31, 2012, $123 million was outstanding under its $200 million revolving credit agreement, leaving $77 million available for future borrowings. The weighted average interest rate related to the borrowings on the credit agreement was 1.63 percent as of March 31, 2012. At March 31, 2012, Northern Border was in compliance with all of its financial covenants.

Northern Border has commitments of $4 million as of March 31, 2012 in connection with various overhaul projects and a transformer upgrade.

GTN’s contractual obligations related to debt as of March 31, 2012 included the following:

	Payments Due by Period
(millions of dollars)	Total	Less than 1 Year	Long-term Portion
5.09% Senior Notes due 2015	75	-	75
5.29% Senior Notes due 2020	100	-	100
5.69% Senior Notes due 2035	150	-	150
	325	-	325

The 2005 Note Purchase Agreement contains a covenant that limits total debt to no greater than 70 percent of total capitalization. At March 31, 2012, the total debt to total capitalization ratio was 39 percent.

GTN was in compliance with all terms and conditions of all its credit and other debt agreements at March 31, 2012.

Bison had commitments of $3 million as of March 31, 2012 in connection with reclamation and restoration work associated with the construction of the pipeline.

Capital Requirements

The Partnership made an equity contribution to Great Lakes of $4 million in the first quarter of 2012. This amount represents the Partnership’s 46.45 percent share of a $9 million cash call from Great Lakes to make a scheduled debt repayment. It expects to make an additional equity contribution to Great Lakes of $5 million in the fourth quarter of 2012. This amount represents the Partnership’s 46.45 percent share of a $10 million cash call from Great Lakes to make a scheduled debt repayment.

To the extent the Partnership has any additional capital requirements with respect to our pipeline systems or acquisitions in the future, we expect to fund these requirements with operating cash flows, debt and/or equity.

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2012 First Quarter Cash Distribution

On April 24, 2012, the board of directors of our General Partner declared the Partnership’s first quarter 2012 cash distribution in the amount of $0.77 per common unit payable on May 15, 2012 to unitholders of record as of May 4, 2012.

RELATED PARTY TRANSACTIONS

Please read Note 9 within Item 1. “Financial Statements” for information regarding related party transactions.

Item 3.                 Quantitative and Qualitative Disclosures About Market Risk

OVERVIEW

The Partnership and our pipeline systems are also exposed to other risks such as interest rate, credit, liquidity and foreign exchange risks. Our exposure to market risk discussed below includes forward-looking statements and is not necessarily indicative of actual results, which may not represent the maximum possible gains and losses that may occur, since actual gains and losses will differ from those estimated, based on actual market conditions.

Market risk is the risk of loss arising from adverse changes in market rates. Our primary risk management objective is to protect earnings and cash flow, and ultimately, unitholder value. We do not use financial instruments for trading purposes.

We record derivative financial instruments on the balance sheet as assets and liabilities at fair value. We estimate the fair value of derivative financial instruments using available market information and appropriate valuation techniques. Changes in the fair value of derivative financial instruments are recognized in earnings unless the instrument qualifies as a hedge and meets specific hedge accounting criteria. Qualifying derivative financial instruments’ gains and losses may offset the hedged items’ related results in earnings for a fair value hedge or be deferred in accumulated other comprehensive income for a cash flow hedge.

MARKET RISK AND INTEREST RATE RISK

From time to time, and in order to finance our business and that of our pipeline systems, the Partnership and our pipeline systems issue debt to invest in growth opportunities and provide for ongoing operations. The issuance of debt exposes the Partnership and our pipeline systems to market risk from changes in interest rates which affect earnings and the value of the financial instruments we hold.

The Partnership and our pipeline systems use derivatives as part of our overall risk management policy to manage exposures to market risk resulting from these activities within established policies and procedures. Derivative contracts used to manage market risk generally consist of the following:

·   Swaps – contractual agreements between two parties to exchange streams of payments over time according to specified terms. The Partnership and our pipeline systems enter into interest rate swaps to mitigate the impact of changes in interest rates.

·   Options – contractual agreements to convey the right, but not the obligation, for the purchaser to buy or sell a specific amount of a financial instrument at a fixed price, either at a fixed date or at any time within a specified period. The Partnership and our pipeline systems enter into option agreements to mitigate the impact of changes in interest rates.

Interest rate risk is created by fluctuations in the fair values or cash flows of financial instruments due to changes in the market interest rates. Our interest rate exposure results from our Senior Credit Facility, which is subject to variability in LIBOR interest rates. We regularly assess the impact of interest rate fluctuations on future cash flows and evaluate hedging opportunities to mitigate our interest rate risk.

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Until December 12, 2011, the Partnership used derivatives to assist in managing its exposure to interest rate risk. In the three months ended March 31, 2012, the Partnership recorded interest expense of nil on the interest rate swaps and options (2011 – $4 million).

At March 31, 2012, we had $328 million (December 31, 2011 – $363 million) outstanding on our Senior Credit Facility. If LIBOR interest rates hypothetically increased by one percent (100 basis points) compared to the rates in effect at March 31, 2012, our annual interest expense would increase and our net income would decrease by $3 million; and if LIBOR interest rates hypothetically decreased by one percent compared to the rates in effect at March 31, 2012, our annual interest expense would decrease and our net income would increase by $3 million.

Northern Border utilizes both fixed-rate and variable-rate debt and is exposed to market risk due to the floating interest rates on its revolving credit facility. Northern Border regularly assesses the impact of interest rate fluctuations on future cash flows and evaluates hedging opportunities to mitigate its interest rate risk. As of March 31, 2012, 74 percent of Northern Border’s outstanding debt was at fixed rates (December 31, 2011 – 74 percent).

If interest rates hypothetically increased by one percent (100 basis points) compared with rates in effect at March 31, 2012, Northern Border’s annual interest expense would increase and its net income would decrease by approximately $1 million; and if interest rates hypothetically decreased by one percent compared with rates in effect at March 31, 2012, Northern Border’s annual interest expense would decrease and its net income would increase by approximately $1 million.

Great Lakes, GTN and Tuscarora utilize fixed-rate debt; therefore, they are not exposed to market risk due to floating interest rates. Interest rate risk does not apply to Bison and North Baja, as they currently do not have any debt.

OTHER RISKS

The Partnership is influenced by the same factors that influence our pipeline systems. None of our pipeline systems own any of the natural gas they transport; therefore, they do not assume any of the related natural gas commodity price risk with respect to transported natural gas volumes.

Counterparty credit risk represents the financial loss that the Partnership and our pipeline systems would experience if a counterparty to a financial instrument failed to meet its obligations in accordance with the terms and conditions of its contracts with the Partnership or its pipeline systems. Our maximum counterparty credit exposure with respect to financial instruments at the balance sheet date consists primarily of the carrying amount, which approximates fair value, of non-derivative financial assets, such as accounts receivable. At March 31, 2012, the Partnership’s maximum counterparty credit exposure consisted of accounts receivable of $7 million (December 31, 2011 – $8 million).

The Partnership and our pipeline systems have significant credit exposure to financial institutions as they provide committed credit lines and critical liquidity in the interest rate derivative market, as well as letters of credit to mitigate exposures to non-creditworthy parties. Due to the lingering effects of the deterioration of global financial markets in the past few years, we continue to closely monitor the creditworthiness of our counterparties, including financial institutions. Overall, we do not believe the Partnership and our pipeline systems have any significant concentrations of counterparty credit risk.

Liquidity risk is the risk that the Partnership and our pipeline systems will not be able to meet our financial obligations as they become due. Our approach to managing liquidity risk is to ensure that we always have sufficient cash and credit facilities to meet our obligations when due, under both normal and stressed conditions, without incurring unacceptable losses or damage to our reputation. At March 31, 2012, the Partnership had a committed revolving bank line of $500 million maturing in 2016with an outstanding balance of $328 million. In addition, at March 31, 2012, Northern Border had a committed revolving bank line of $200 million maturing in 2016 of which $123 million was drawn.

The Partnership does not have any material foreign exchange risks.

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Item 4.                      Controls and Procedures

EVALUATION OF DISCLOSURE CONTROLS AND PROCEDURES

As required by Rule 13a-15(e) under the Exchange Act, the management of our General Partner, including the principal executive officer and principal financial officer, evaluated as of the end of the period covered by this report the effectiveness of our disclosure controls and procedures. There are inherent limitations to the effectiveness of any system of disclosure controls and procedures, including the possibility of human error and the circumvention or overriding of the controls and procedures. The Partnership’s disclosure controls and procedures are designed to provide reasonable assurance of achieving their objectives. Based upon and as of the date of the evaluation, the management of our General Partner, including the principal executive officer and principal financial officer, concluded that the Partnership’s disclosure controls and procedures as of the end of the period covered by this quarterly report were effective to provide reasonable assurance that the information required to be disclosed by the Partnership in the reports that it files or submits under the Securities Exchange Act of 1934, as amended (the “Exchange Act”), is (a) recorded, processed, summarized and reported within the time periods specified in the SEC’s rules and forms and (b) accumulated and communicated to the management of our General Partner, including the principal executive officer and principal financial officer, to allow timely decisions regarding required disclosure.

Changes in Internal Control Over Financial Reporting

During the quarter ended March 31, 2012, there was no change in the Partnership’s internal control over financial reporting that has materially affected or is reasonably likely to materially affect our internal control over financial reporting.

PART II – OTHER INFORMATION

Item 1.                 Legal Proceedings

On March 9, 2012, Tuscarora received approval from the FERC for the Tuscarora Settlement. For additional information on the Tuscarora Settlement and a description of other legal and environmental proceedings affecting the Partnership, please refer to Part 1. Item 3 of the Partnership’s Annual Report on Form 10-K for the year-ended December 31, 2011.

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Item 6. Exhibits

No.	Description
31.1	Certification of Principal Executive Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
31.2	Certification of Principal Financial Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
32.1	Certification of Principal Executive Officer pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
32.2	Certification of Principal Financial Officer pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
99.1	Transportation Service Agreement FT17189 between Great Lakes Gas Transmission Limited Partnership and TransCanada PipeLines Limited, dated February 6, 2012.
99.2	Transportation Service Agreement FT17190 between Great Lakes Gas Transmission Limited Partnership and TransCanada PipeLines Limited, dated February 6, 2012.
99.3	Transportation Service Agreement FT17193 between Great Lakes Gas Transmission Limited Partnership and TransCanada PipeLines Limited, dated February 6, 2012.
101.INS	XBRL Instance Document.
101.SCH	XBRL Taxonomy Extension Schema Document.
101.CAL	XBRL Taxonomy Extension Calculation Linkbase Document.
101.DEF	XBRL Taxonomy Definition Linkbase Document.
101.LAB	XBRL Taxonomy Extension Label Linkbase Document.
101.PRE	XBRL Taxonomy Extension Presentation Linkbase Document.

30

SIGNATURES

Pursuant to the requirements of Section 13 or 15(d) 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 on this 30th day of April 2012.

TC PIPELINES, LP

(A Delaware Limited Partnership)

by its General Partner, TC PipeLines GP, Inc.

By: /s/ Steven D. Becker

       ______________________________

Steven D. Becker

President

TC PipeLines GP, Inc. (Principal Executive Officer)

By: /s/ Sandra P. Ryan-Robinson

       ______________________________

Sandra P. Ryan-Robinson

Controller

TC PipeLines GP, Inc. (Principal Financial Officer)

31

EXHIBIT INDEX

No.	Description
31.1	Certification of Principal Executive Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
31.2	Certification of Principal Financial Officer pursuant to Section 302 of the Sarbanes-Oxley Act of 2002.
32.1	Certification of Principal Executive Officer pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
32.2	Certification of Principal Financial Officer pursuant to Section 906 of the Sarbanes-Oxley Act of 2002.
99.1	Transportation Service Agreement FT17189 between Great Lakes Gas Transmission Limited Partnership and TransCanada PipeLines Limited, dated February 6, 2012.
99.2	Transportation Service Agreement FT17190 between Great Lakes Gas Transmission Limited Partnership and TransCanada PipeLines Limited, dated February 6, 2012.
99.3	Transportation Service Agreement FT17193 between Great Lakes Gas Transmission Limited Partnership and TransCanada PipeLines Limited, dated February 6, 2012.
101.INS	XBRL Instance Document.
101.SCH	XBRL Taxonomy Extension Schema Document.
101.CAL	XBRL Taxonomy Extension Calculation Linkbase Document.
101.DEF	XBRL Taxonomy Definition Linkbase Document.
101.LAB	XBRL Taxonomy Extension Label Linkbase Document.
101.PRE	XBRL Taxonomy Extension Presentation Linkbase Document.

32 

EX-31.1

 Exhibit 31.1

CERTIFICATION OF

PRINCIPAL EXECUTIVE OFFICER

I, Steven D. Becker, certify that:

1.   I have reviewed this quarterly report on Form 10-Q of TC PipeLines, LP;

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 evaluations; 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.

Dated:  April 30, 2012

/s/ Steven D. Becker                                                                

Steven D. Becker

Principal Executive Officer and President

TC PipeLines GP, Inc., as General Partner of

TC PipeLines, LP

EX-31.2

Exhibit 31.2

CERTIFICATION OF

PRINCIPAL FINANCIAL OFFICER

I, Sandra P. Ryan-Robinson, certify that:

1.   I have reviewed this quarterly report on Form 10-Q of TC PipeLines, LP;

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 evaluations; 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.

Dated:  April 30, 2012

/s/ Sandra P. Ryan-Robinson

Sandra P. Ryan-Robinson

Principal Financial Officer and Controller

TC PipeLines GP, Inc., as General Partner of

TC Pipelines, LP

EX-32.1

Exhibit 32.1

CERTIFICATION OF

PRINCIPAL EXECUTIVE OFFICER

I, Steven D. Becker, Principal Executive Officer and President of TC PipeLines GP, Inc., the General Partner of TC PipeLines, LP (the Partnership), in compliance with 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 hereby certify,to the best of my knowledge, in connection with the Partnership’s Quarterly Report on Form 10-Q for the period ended March 31, 2012 as filed with the Securities and Exchange Commission (the Report) on the date hereof, that:

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

·   the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Partnership.

Dated:  April 30, 2012                                                                          

/s/ Steven D. Becker                                                                

Steven D. Becker

Principal Executive Officer and President

TC PipeLines GP, Inc., as General Partner of

TC PipeLines, LP

EX-32.2

Exhibit 32.2

CERTIFICATION OF

PRINCIPAL FINANCIAL OFFICER

I, Sandra P. Ryan-Robinson, Principal Financial Officer and Controller of TC PipeLines GP, Inc., the General Partner of TC PipeLines, LP (the Partnership), in compliance with 18 U.S.C. Section 1350, as adopted pursuant to Section 906 of the Sarbanes-Oxley Act of 2002 hereby certify, to the best of my knowledge, in connection with the Partnership’s Quarterly Report on Form 10-Q for the period ended March 31, 2012 as filed with the Securities and Exchange Commission (the Report) on the date hereof, that:

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

·   the information contained in the Report fairly presents, in all material respects, the financial condition and results of operations of the Partnership.

Dated:  April 30, 2012                                                                    

/s/ Sandra P. Ryan-Robinson

Sandra P. Ryan-Robinson

Principal Financial Officer and Controller

TC PipeLines GP, Inc., as General Partner of

TC PipeLines, LP

EX-99.1

Exhibit 99.1

TRANSPORTATION SERVICE AGREEMENT

Contract Identification FT17189

This Transportation Service Agreement (Agreement) is entered into by Great Lakes Gas Transmission Limited Partnership (Transporter) and TRANSCANADA PIPELINES LIMITED(Shipper).

WHEREAS, Shipper has requested Transporter to transport Gas on its behalf and Transporter represents that it is willing to transport Gas under the terms and conditions of this Agreement.

NOW, THEREFORE, Transporter and Shipper agree that the terms below constitute the transportation service to be provided and the rights and obligations of Shipper and Transporter.

1.EFFECTIVE DATE:  February 06, 2012

2. CONTRACT IDENTIFICATION:  FT17189

3.RATE SCHEDULE:  FT

4.SHIPPER TYPE:  Other

5.STATE/PROVINCE OF INCORPORATION:  Canada

6.TERM: November 01, 2012 to October 31, 2014

Transporter and Shipper agree that Shipper may extend the primary term of this Agreement by exercising a Contractual Right of First Refusal, pursuant to the procedures set forth in Section 6.16 of the General

Terms and Conditions of Transporter’s FERC Gas Tariff.

7. EFFECT ON PREVIOUS CONTRACTS:

This Agreement supersedes, cancels and terminates, as of the effective date stated above, the following contract(s):  N/A

8. MAXIMUM DAILY QUANTITY (Dth/Day): 100,000

Please see Appendix A for further detail.

9.RATES:

Unless Shipper and Transporter have agreed to a rate other than the maximum rate, rates shall be Transporter's maximum rates and charges plus all applicable surcharges in effect from time to time under the applicable Rate Schedule (as stated above) on file with the Commission unless otherwise agreed to by the parties in writing. Provisions governing a Rate other than the maximum shall be set forth in this Paragraph 9 and/or on Appendix B hereto.

Shipper and Transporter agree that for service under this Agreement from the point(s) of receipt listed on Appendix A to the point(s) of delivery listed on Appendix A, the Reservation Fee to be charged shall be the lesser of $8.517 per Dth or Great Lakes' currently effective Maximum Tariff Rate.

Contract ID: FT17189

10. POINTS OF RECEIPT AND DELIVERY:

The primary receipt and delivery points are set forth on Appendix A.

11.RELEASED CAPACITY:

N/A

12. INCORPORATION OF TARIFF INTO AGREEMENT:

This Agreement shall incorporate and in all respects be subject to the "General Terms and Conditions" and the applicable Rate Schedule (as stated above) set forth in Transporter's FERC Gas Tariff, Third Revised Volume No. 1, as may be revised from time to time.  Transporter may file and seek Commission approval under Section 4 of the Natural Gas Act (NGA) at any time and from time to time to change any rates, charges or provisions set forth in the applicable Rate Schedule (as stated above) and the "General Terms and Conditions" in Transporter's FERC Gas Tariff, Third Revised Volume No. 1, and Transporter shall have the right to place such changes in effect in accordance with the NGA, and this Agreement shall be deemed to include such changes and any such changes which become effective by operation of law and Commission Order, without prejudice to Shipper's right to protest the same.

13.MISCELLANEOUS:

No waiver by either party to this Agreement of any one or more defaults by the other in the  performance of this Agreement shall operate or be construed as a waiver of any continuing or future default(s), whether of a like or a different character.

Any controversy between the parties arising under this Agreement and not resolved by the parties shall be determined in accordance with the laws of the State of Michigan.

14.OTHER PROVISIONS:

It is agreed that no personal liability whatsoever shall attach to, be imposed on or otherwise be incurred by any Partner, agent, management official or employee of the Transporter or any director, officer or employee of any of the foregoing, for any obligation of the Transporter arising under this Agreement or for any claim based on such obligation and that the sole recourse of Shipper under this Agreement is limited to assets of the Transporter.

Upon termination of this Agreement, Shipper's and Transporter's obligations to each other arising under this Agreement, prior to the date of termination, remain in effect and are not being terminated by any provision of this Agreement.

Transporter and Shipper agree that, pursuant to Section 6.2.1(h) of the General Terms and Conditions, this Agreement is subject to a Reduction Option as herein described:

Shipper shall have a one-time Reduction Option which may be invoked by providing Transporter written notice (“Notice”), within 30 days of receipt by Shipper of a decision by the National Energy Board that all or part of the contracted volume or costs which are the subject of this Service Agreement were not approved for full cost recovery by Shipper but in no case later than June 30, 2013.   If Shipper invokes this one-time Reduction Option, it may reduce all or any portion of the MDQ associated with this Agreement, such reduction to be effective on the first day of the calendar month following Transporter’s receipt of Shipper’s Notice.

2

Contract ID: FT17189

15. NOTICES AND COMMUNICATIONS:

All notices and communications with respect to this Agreement shall be in writing by mail, e-mail, or fax, or other means as agreed to by the parties, and sent to the addresses stated below or to any other such address(es) as may be designated in writing by mail, e-mail, or fax, or other means similarly agreed to:

ADMINISTRATIVE MATTERS

Great Lakes Gas Transmission Limited	TRANSCANADA PIPELINES LIMITED
Partnership	450 - 1st Street S.W.
Commercial Services	Calgary, AB T2P 5H1
717 Texas Street	Canada
Houston, TX  77002-2761	Attn: Steve Pohlod

AGREED TO BY:

GREAT LAKES GAS TRANSMISSION LIMITED PARTNERSHIP	TRANSCANADA PIPELINES LIMITED
By: Great Lakes Gas Transmission Company
By:        /s/ Joseph E. Pollard	By:       /s/ Karl Johannson
Joseph E. Pollard	Karl Johannson
Title:  Director, Commercial Services	Title: Senior Vice-President, Canadian  and Eastern US Pipelines
	By:       /s/ Steve Pohlod
	Steve Pohlod
	Title: Vice-President, Commercial-East  Canadian Pipelines

3

APPENDIX A

Contract Identification FT17189

Date:  February 06, 2012

Supersedes Appendix Dated: Not Applicable

Shipper:  TRANSCANADA PIPELINES LIMITED

Maximum Daily Quantity (Dth/Day) per Location:

					Maximum Allowable Operating Pressure
Begin Date	End Date	Point(s) of Primary Receipt	Point(s) of Primary Delivery	MDQ	(MAOP)
11/01/2012	10/31/2014	EMERSON		100,000	974
11/01/2012	10/31/2014		ST. CLAIR	100,000	974

EX-99.2

Exhibit 99.2

TRANSPORTATION SERVICE AGREEMENT

Contract Identification FT17190

This Transportation Service Agreement (Agreement) is entered into by Great Lakes Gas Transmission Limited Partnership (Transporter) and TRANSCANADA PIPELINES LIMITED(Shipper).

WHEREAS, Shipper has requested Transporter to transport Gas on its behalf and Transporter represents that it is willing to transport Gas under the terms and conditions of this Agreement.

NOW, THEREFORE, Transporter and Shipper agree that the terms below constitute the transportation service to be provided and the rights and obligations of Shipper and Transporter.

1.EFFECTIVE DATE:  February 06, 2012

2. CONTRACT IDENTIFICATION:  FT17190

3.RATE SCHEDULE:  FT

4.SHIPPER TYPE:  Other

5.STATE/PROVINCE OF INCORPORATION:  Canada

6.TERM: November 01, 2012 to October 31, 2015

Transporter and Shipper agree that Shipper may extend the primary term of this Agreement by exercising a Contractual Right of First Refusal, pursuant to the procedures set forth in Section 6.16 of the General Terms and Conditions of Transporter’s FERC Gas Tariff.

7. EFFECT ON PREVIOUS CONTRACTS:

This Agreement supersedes, cancels and terminates, as of the effective date stated above, the following contract(s):  N/A

8. MAXIMUM DAILY QUANTITY (Dth/Day): 160,000

Please see Appendix A for further detail.

9.RATES:

Unless Shipper and Transporter have agreed to a rate other than the maximum rate, rates shall be Transporter's maximum rates and charges plus all applicable surcharges in effect from time to time under the applicable Rate Schedule (as stated above) on file with the Commission unless otherwise agreed to by the parties in writing. Provisions governing a Rate other than the maximum shall be set forth in this Paragraph 9 and/or on Appendix B hereto.

Shipper and Transporter agree that for service under this Agreement from the point(s) of receipt listed on Appendix A to the point(s) of delivery listed on Appendix A, the Reservation Fee to be charged shall be the lesser of $3.650 per Dth or Great Lakes' currently effective Maximum Tariff Rate.

Contract ID: FT17190

10. POINTS OF RECEIPT AND DELIVERY:

The primary receipt and delivery points are set forth on Appendix A.

11.RELEASED CAPACITY:

 N/A

12. INCORPORATION OF TARIFF INTO AGREEMENT:

This Agreement shall incorporate and in all respects be subject to the "General Terms and Conditions" and the applicable Rate Schedule (as stated above) set forth in Transporter's FERC Gas Tariff, Third Revised Volume No. 1, as may be revised from time to time.  Transporter may file and seek Commission approval under Section 4 of the Natural Gas Act (NGA) at any time and from time to time to change any rates, charges or provisions set forth in the applicable Rate Schedule (as stated above) and the "General Terms and Conditions" in Transporter's FERC Gas Tariff, Third Revised Volume No. 1, and Transporter shall have the right to place such changes in effect in accordance with the NGA, and this Agreement shall be deemed to include such changes and any such changes which become effective by operation of law and Commission Order, without prejudice to Shipper's right to protest the same.

13.MISCELLANEOUS:

No waiver by either party to this Agreement of any one or more defaults by the other in the  performance of this Agreement shall operate or be construed as a waiver of any continuing or future default(s), whether of a like or a different character.

Any controversy between the parties arising under this Agreement and not resolved by the parties shall be determined in accordance with the laws of the State of Michigan.

14.OTHER PROVISIONS:

It is agreed that no personal liability whatsoever shall attach to, be imposed on or otherwise be incurred by any Partner, agent, management official or employee of the Transporter or any director, officer or employee of any of the foregoing, for any obligation of the Transporter arising under this Agreement or for any claim based on such obligation and that the sole recourse of Shipper under this Agreement is limited to assets of the Transporter.

Upon termination of this Agreement, Shipper's and Transporter's obligations to each other arising under this Agreement, prior to the date of termination, remain in effect and are not being terminated by any provision of this Agreement.

2

Contract ID: FT17190

15. NOTICES AND COMMUNICATIONS:

All notices and communications with respect to this Agreement shall be in writing by mail, e-mail, or fax, or other means as agreed to by the parties, and sent to the addresses stated below or to any other such address(es) as may be designated in writing by mail, e-mail, or fax, or other means similarly agreed to:

ADMINISTRATIVE MATTERS

Great Lakes Gas Transmission Limited	TRANSCANADA PIPELINES LIMITED
Partnership	450 - 1st Street S.W.
Commercial Services	Calgary, AB T2P 5H1
717 Texas Street	Canada
Houston, TX  77002-2761	Attn: Steve Pohlod

AGREED TO BY:

GREAT LAKES GAS TRANSMISSION LIMITED PARTNERSHIP	TRANSCANADA PIPELINES LIMITED
By: Great Lakes Gas Transmission Company
By:        /s/ Joseph E. Pollard	By:       /s/ Karl Johannson
Joseph E. Pollard	Karl Johannson
Title:  Director, Commercial Services	Title: Senior Vice-President, Canadian  and Eastern US Pipelines
	By:       /s/ Steve Pohlod
	Steve Pohlod
	Title: Vice-President, Commercial-East  Canadian Pipelines

3

APPENDIX A

Contract Identification FT17190

Date:  February 06, 2012

Supersedes Appendix Dated: Not Applicable

Shipper:  TRANSCANADA PIPELINES LIMITED

Maximum Daily Quantity (Dth/Day) per Location:

					Maximum Allowable Operating Pressure
Begin Date	End Date	Point(s) of Primary Receipt	Point(s) of Primary Delivery	MDQ	(MAOP)
11/01/2012	03/31/2013	ST. CLAIR		123,962	974
04/01/2013	10/31/2013	ST. CLAIR		160,000	974
11/01/2013	03/31/2014	ST. CLAIR		123,962	974
04/01/2014	10/31/2014	ST. CLAIR		160,000	974
11/01/2014	03/31/2015	ST. CLAIR		123,962	974
04/01/2015	10/31/2015	ST. CLAIR		160,000	974
11/01/2012	03/31/2013		EMERSON	123,962	974
04/01/2013	10/31/2013		EMERSON	160,000	974
11/01/2013	03/31/2014		EMERSON	123,962	974
04/01/2014	10/31/2014		EMERSON	160,000	974
11/01/2014	03/31/2015		EMERSON	123,962	974
04/01/2015	10/31/2015		EMERSON	160,000	974

EX-99.3

Exhibit 99.3

TRANSPORTATION SERVICE AGREEMENT

Contract Identification FT17193

This Transportation Service Agreement (Agreement) is entered into by Great Lakes Gas Transmission Limited Partnership (Transporter) and TRANSCANADA PIPELINES LIMITED(Shipper).

WHEREAS, Shipper has requested Transporter to transport Gas on its behalf and Transporter represents that it is willing to transport Gas under the terms and conditions of this Agreement.

NOW, THEREFORE, Transporter and Shipper agree that the terms below constitute the transportation service to be provided and the rights and obligations of Shipper and Transporter.

1.EFFECTIVE DATE:  February 06, 2012

2. CONTRACT IDENTIFICATION:  FT17193

3.RATE SCHEDULE:  FT

4.SHIPPER TYPE:  Other

5.STATE/PROVINCE OF INCORPORATION:  Canada

6.TERM: November 01, 2012 to October 31, 2015

Transporter and Shipper agree that Shipper may extend the primary term of this Agreement by exercising a Contractual Right of First Refusal, pursuant to the procedures set forth in Section 6.16 of the General Terms and Conditions of Transporter’s FERC Gas Tariff.

7. EFFECT ON PREVIOUS CONTRACTS:

This Agreement supersedes, cancels and terminates, as of the effective date stated above, the following contract(s):  N/A

8. MAXIMUM DAILY QUANTITY (Dth/Day): 36,038

Please see Appendix A for further detail.

9.RATES:

Unless Shipper and Transporter have agreed to a rate other than the maximum rate, rates shall be Transporter's maximum rates and charges plus all applicable surcharges in effect from time to time under the applicable Rate Schedule (as stated above) on file with the Commission unless otherwise agreed to by the parties in writing. Provisions governing a Rate other than the maximum shall be set forth in this Paragraph 9 and/or on Appendix B hereto.

Shipper and Transporter agree that for service under this Agreement from the point(s) of receipt listed on Appendix A to the point(s) of delivery listed on Appendix A, the Reservation Fee to be charged shall be the lesser of $5.323 per Dth or Great Lakes' currently effective Maximum Tariff Rate.

Contract ID: FT17193

10. POINTS OF RECEIPT AND DELIVERY:

The primary receipt and delivery points are set forth on Appendix A.

11.RELEASED CAPACITY:

N/A

12. INCORPORATION OF TARIFF INTO AGREEMENT:

This Agreement shall incorporate and in all respects be subject to the "General Terms and Conditions" and the applicable Rate Schedule (as stated above) set forth in Transporter's FERC Gas Tariff, Third Revised Volume No. 1, as may be revised from time to time.  Transporter may file and seek Commission approval under Section 4 of the Natural Gas Act (NGA) at any time and from time to time to change any rates, charges or provisions set forth in the applicable Rate Schedule (as stated above) and the "General Terms and Conditions" in Transporter's FERC Gas Tariff, Third Revised Volume No. 1, and Transporter shall have the right to place such changes in effect in accordance with the NGA, and this Agreement shall be deemed to include such changes and any such changes which become effective by operation of law and Commission Order, without prejudice to Shipper's right to protest the same.

13.MISCELLANEOUS:

No waiver by either party to this Agreement of any one or more defaults by the other in the  performance of this Agreement shall operate or be construed as a waiver of any continuing or future default(s), whether of a like or a different character.

Any controversy between the parties arising under this Agreement and not resolved by the parties shall be determined in accordance with the laws of the State of Michigan.

14.OTHER PROVISIONS:

It is agreed that no personal liability whatsoever shall attach to, be imposed on or otherwise be incurred by any Partner, agent, management official or employee of the Transporter or any director, officer or employee of any of the foregoing, for any obligation of the Transporter arising under this Agreement or for any claim based on such obligation and that the sole recourse of Shipper under this Agreement is limited to assets of the Transporter.

Upon termination of this Agreement, Shipper's and Transporter's obligations to each other arising under this Agreement, prior to the date of termination, remain in effect and are not being terminated by any provision of this Agreement.

2

Contract ID: FT17193

15. NOTICES AND COMMUNICATIONS:

All notices and communications with respect to this Agreement shall be in writing by mail, e-mail, or fax, or other means as agreed to by the parties, and sent to the addresses stated below or to any other such address(es) as may be designated in writing by mail, e-mail, or fax, or other means similarly agreed to:

ADMINISTRATIVE MATTERS

Great Lakes Gas Transmission Limited	TRANSCANADA PIPELINES LIMITED
Partnership	450 - 1st Street S.W.
Commercial Services	Calgary, AB T2P 5H1
717 Texas Street	Canada
Houston, TX  77002-2761	Attn: Steve Pohlod

AGREED TO BY:

GREAT LAKES GAS TRANSMISSION LIMITED PARTNERSHIP	TRANSCANADA PIPELINES LIMITED
By: Great Lakes Gas Transmission Company
By:        /s/ Joseph E. Pollard	By:       /s/ Karl Johannson
Joseph E. Pollard	Karl Johannson
Title:  Director, Commercial Services	Title: Senior Vice-President, Canadian  and Eastern US Pipelines
	By:       /s/ Steve Pohlod
	Steve Pohlod
	Title: Vice-President, Commercial-East  Canadian Pipelines

3

Contract ID: FT17193

APPENDIX A

Contract Identification FT17193

Date:  February 06, 2012

Supersedes Appendix Dated: Not Applicable

Shipper:  TRANSCANADA PIPELINES LIMITED

Maximum Daily Quantity (Dth/Day) per Location:

					Maximum Allowable Operating Pressure
Begin Date	End Date	Point(s) of Primary Receipt	Point(s) of Primary Delivery	MDQ	(MAOP)
11/01/2012	03/31/2013	ST. CLAIR		36,038	974
04/01/2013	10/31/2013	ST. CLAIR		0	974
11/01/2013	03/31/2014	ST. CLAIR		36,038	974
04/01/2014	10/31/2014	ST. CLAIR		0	974
11/01/2014	03/31/2015	ST. CLAIR		36,038	974
04/01/2015	10/31/2015	ST. CLAIR		0	974
11/01/2012	03/31/2013		SAULT STE. MARIE TCPL	36,038	1142
04/01/2013	10/31/2013		SAULT STE. MARIE TCPL	0	1142
11/01/2013	03/31/2014		SAULT STE. MARIE TCPL	36,038	1142
04/01/2014	10/31/2014		SAULT STE. MARIE TCPL	0	1142
11/01/2014	03/31/2015		SAULT STE. MARIE TCPL	36,038	1142
04/01/2015	10/31/2015		SAULT STE. MARIE TCPL	0	1142

XML

FINANCIAL INSTRUMENTS (Details) (Fair Value, USD $) In Millions, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Fair Value
Financial Instruments
Long-term debt	$ 723	$ 763

XML

CREDIT FACILITIES AND LONG-TERM DEBT (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011	Dec. 31, 2011
Credit facility and long-term debt
Long-term debt	$ 707		$ 742
Less: current portion of long-term debt	3		3
Noncurrent portion of long-term debt	704		739
Senior Credit Facility due 2016
Credit facility and long-term debt
Long-term debt	328		363
Maximum borrowing capacity	500
Remaining borrowing capacity	172
Line of credit facility, base rate	LIBOR	LIBOR
Debt interest rate (as a percent)	1.63%
Debt average interest rate (as a percent)	1.65%	0.83%
Debt average interest rate, after hedging activity (as a percent)		4.01%
Debt interest rate, at period end, prior to hedging activities (as a percent)		0.79%
4.65% Senior Notes due 2021
Credit facility and long-term debt
Long-term debt	349		349
Debt interest rate (as a percent)	4.65%
6.89% Series C Senior Notes due 2012
Credit facility and long-term debt
Long-term debt	3		3
Debt interest rate (as a percent)	6.89%
3.82% Series D Senior Notes due 2017
Credit facility and long-term debt
Long-term debt	$ 27		$ 27
Debt interest rate (as a percent)	3.82%

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CREDIT FACILITIES AND LONG-TERM DEBT (Tables)

3 Months Ended

Mar. 31, 2012

CREDIT FACILITIES AND LONG-TERM DEBT

Components of debt

(unaudited)	March 31,		December 31,
(millions of dollars)	2012		2011
Senior Credit Facility due 2016		328		363
4.65% Senior Notes due 2021		349		349
6.89% Series C Senior Notes due 2012		3		3
3.82% Series D Senior Notes due 2017		27		27
		707		742
Less: current portion of long-term debt		3		3
		704		739

Principal repayments required on long-term debt

(unaudited)
(millions of dollars)
2012	3
2013	3
2014	4
2015	4
2016	332
Thereafter	361
	707

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REGULATORY MATTERS (Details)	1 Months Ended
	Mar. 31, 2012 Y
REGULATORY MATTERS
Term of contract extensions	3

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CHANGE IN WORKING CAPITAL (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
CHANGE IN WORKING CAPITAL
Decrease in accounts receivable and other	$ 1
Increase/(decrease) in accounts payable and accrued liabilities	1	(2)
Increase in accrued interest	5	1
Decrease/(increase) in operating working capital	$ 7	$ (1)

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ORGANIZATION

3 Months Ended

Mar. 31, 2012

ORGANIZATION

ORGANIZATION

NOTE 1                 ORGANIZATION

TC PipeLines, LP and its subsidiaries are collectively referred to herein as the Partnership. The Partnership was formed by TransCanada PipeLines Limited, a wholly-owned subsidiary of TransCanada Corporation (TransCanada Corporation together with its subsidiaries collectively referred to herein as TransCanada), to acquire, own and participate in the management of energy infrastructure assets in North America.

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SUBSEQUENT EVENTS (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	1 Months Ended
	May 31, 2012	Apr. 30, 2012	May 02, 2012
Great Lakes
Subsequent events
Aggregate distribution declared and payable by investee		$ 27
Ownership interest (as a percent)			46.45%
Partnership's share of distributions declared and payable by investee	12
Northern Border
Subsequent events
Aggregate distribution declared and payable by investee		52
Ownership interest (as a percent)			50.00%
Partnership's share of distributions declared and payable by investee	26
GTN
Subsequent events
Aggregate distribution declared and payable by investee		33
Ownership interest (as a percent)			25.00%
Partnership's share of distributions declared and payable by investee	8
Bison
Subsequent events
Aggregate distribution declared and payable by investee		17
Ownership interest (as a percent)			25.00%
Partnership's share of distributions declared and payable by investee	$ 4
Cash distribution declared
Subsequent events
Cash distribution (in dollars per unit)		$ 0.77

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ACCOUNTS RECEIVABLE AND OTHER (Tables)

3 Months Ended

Mar. 31, 2012

ACCOUNTS RECEIVABLE AND OTHER

Schedule of accounts receivable and other

(unaudited)	March 31,		December 31,
(millions of dollars)	2012		2011
Accounts receivable		7		8
Inventory		1		1
		8		9

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RELATED PARTY TRANSACTIONS (Tables)

3 Months Ended

Mar. 31, 2012

RELATED PARTY TRANSACTIONS

Schedule of costs charged by related party

(unaudited)	Three months ended March 31,
(millions of dollars)	2012		2011
Capital and operating costs charged by TransCanada's subsidiaries to:
Great Lakes(a)		8		8
Northern Border(a)		8		7
GTN(a)(b)		7		-
Bison(a)(b)		2		-
North Baja		1		1
Tuscarora		1		1
Impact on the Partnership's net income:
Great Lakes(a)		4		4
Northern Border(a)		4		3
GTN(a)(b)		7		-
Bison(a)(b)		1		-
North Baja		1		1
Tuscarora		1		1

(a) Represents 100 percent of the costs.

(b) There were no amounts from GTN and Bison in the 2011 period as the 25 percent interests in each were acquired in May 2011.

Schedule of amounts payable to related party for costs charged during the period

(unaudited)	March 31,		December 31,
(millions of dollars)		2012		2011
Amount payable to TransCanada's subsidiaries for costs charged in the year by:
Great Lakes(a)		3		3
Northern Border(a)		3		3
GTN(a)		3		3
Bison(a)		1		1
North Baja		-		1
Tuscarora		-		1

(a) Represents 100 percent of the costs.

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SIGNIFICANT ACCOUNTING POLICIES (Details)	1 Months Ended
	May 31, 2011
GTN
Acquisitions
Interest acquired by the Partnership (as a percent)	25.00%
Bison
Acquisitions
Interest acquired by the Partnership (as a percent)	25.00%

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INVESTMENTS IN UNCONSOLIDATED AFFILIATES (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended					3 Months Ended			1 Months Ended	3 Months Ended			3 Months Ended				3 Months Ended
	Mar. 31, 2012		Mar. 31, 2011		Dec. 31, 2011	Mar. 31, 2012 Great Lakes	Mar. 31, 2011 Great Lakes	Dec. 31, 2011 Great Lakes	Apr. 30, 2006 Northern Border	Mar. 31, 2012 Northern Border Y	Mar. 31, 2011 Northern Border	Dec. 31, 2011 Northern Border	Mar. 31, 2012 GTN	Dec. 31, 2011 GTN	May 31, 2011 GTN	May 03, 2011 GTN	Mar. 31, 2012 Bison	Dec. 31, 2011 Bison	May 31, 2011 Bison	May 03, 2011 Bison
Investments in unconsolidated affiliates
Ownership interest at the end of the period (as a percent)						46.45%				50.00%			25.00%		25.00%	25.00%	25.00%		25.00%	25.00%
Equity income	$ 38	[1]	$ 39	[1]		$ 9	$ 18			$ 20	$ 21		$ 6				$ 3
Investment in Unconsolidated Affiliates	1,606				1,610	688		686		531		536	225	225			162	163
Amortization period of transaction fee (in years)										12
Transaction fee									10
Additional ownership interest acquired (as a percent)									20.00%
Equity contribution						4	4
Total cash call issued by Great Lakes to fund its debt repayment						9
Assets
Current assets						65		65					66	55			7	10
Cash and cash equivalents										39		33
Other current assets										37		35
Plant, property and equipment, net						819		826		1,255		1,267	1,197	1,207			656	658
Other assets						1		1		30		31	2	1
Assets, total						885		892		1,361		1,366	1,265	1,263			663	668
Liabilities and Partners' Equity
Current liabilities						26		30		51		48	18	18			15	17
Deferred credits and other						1				14		13	20	20
Long-term debt, including current maturities						364		373		473		473	325	325
Partners' equity
Partners' capital						494		489		826		835	902	900			648	651
Accumulated other comprehensive loss										(3)		(3)
Liabilities and Equity, total						885		892		1,361		1,366	1,265	1,263			663	668
Revenues (expenses)
Transmission revenues						49	70			81	80		52				20
Operating expenses						(15)	(14)			(18)	(17)		(11)				(3)
Depreciation						(8)	(8)			(16)	(15)		(13)				(5)
Financial charges and other						(7)	(7)			(6)	(6)		(5)
Michigan business tax							(2)
Net income						$ 19	$ 39			$ 41	$ 42		$ 23				$ 12

[1] There were no equity earnings from GTN and Bison in the 2011 period as the 25 percent interests in each were acquired in May 2011.

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CONSOLIDATED STATEMENT OF CHANGES IN PARTNERS' EQUITY (USD $) In Millions, unless otherwise specified	Total		Common Units	General Partner	Accumulated Other Comprehensive Loss
Partners' equity at Dec. 31, 2011	$ 1,333		$ 1,307	$ 27	$ (1)
Partners' equity (in units) at Dec. 31, 2011	53.5		53.5
Increase (Decrease) in Partners' Equity
Net income	39	[1]	38	1
Distributions paid	(42)		(41)	(1)
Partners' equity at Mar. 31, 2012	$ 1,330		$ 1,304	$ 27	$ (1)
Partners' equity (in units) at Mar. 31, 2012	53.5		53.5

[1] There were no equity earnings from GTN and Bison in the 2011 period as the 25 percent interests in each were acquired in May 2011.

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ACQUISITIONS (Details) (USD $) In Millions, except Share data, unless otherwise specified	3 Months Ended	1 Months Ended	12 Months Ended			1 Months Ended			1 Months Ended
	Mar. 31, 2012 General Partner	May 31, 2011 GTN and Bison	Dec. 31, 2011 GTN and Bison	May 03, 2011 GTN and Bison Bridge loan facility	May 03, 2011 GTN and Bison Senior revolving credit facility	May 31, 2011 GTN and Bison TransCanada Subsidiaries	May 03, 2011 GTN and Bison TransCanada Subsidiaries	May 03, 2011 GTN TransCanada Subsidiaries	May 31, 2011 Bison TransCanada Subsidiaries	May 03, 2011 Bison TransCanada Subsidiaries	Mar. 25, 2011 Yuma Lateral Asset Acquisition TransCanada Corporation	Jun. 29, 2010 Yuma Lateral Asset Acquisition TransCanada Corporation Maximum
Asset acquisition
Interest acquired by the Partnership (as a percent)								25.00%		25.00%
Purchase price							$ 605	$ 405		$ 200
Acquired debt								81
Percentage of acquired debt								25.00%
Future commitments related to acquisitions									9
Additional payment to TransCanada			23
Purchase price recorded as working capital			1
Cash paid							539				2
Number of common units sold in public offering		7,245,000
Price per common unit issued (in dollars per unit)		$ 47.58
Net proceeds from issuance of common units		331
Amount drawn on credit facility to finance acquisition				61	125
Maximum borrowing capacity				400	250
Contribution by General Partners						7
General partner ownership interest in the partnership (as a percent)	2.00%
Cash on hand							15
Payment to be made to TransCanada												$ 2

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FINANCIAL INSTRUMENTS (Details 2) (Interest rate swaps and options, USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2011
Interest rate swaps and options
Derivative financial instruments
Interest expense on the interest rate swaps and options	$ 4

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CONSOLIDATED STATEMENT OF INCOME (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2012		Mar. 31, 2011
Equity earnings from unconsolidated affiliates (Note 3)	$ 38	[1]	$ 39	[1]
Transmission revenues	16		17
Operating expenses	(4)		(3)
General and administrative	(2)		(2)
Depreciation	(3)		(4)
Financial charges and other	(6)		(5)
Net income	39	[1]	42	[1]
Net income allocation (Note 6)
Common units	38		41
General partner	1		1
Net income allocated to partners (Note 6)	$ 39		$ 42
Net income per common unit (Note 6) (in dollars per unit)	$ 0.71		$ 0.90
Weighted average common units outstanding (millions) (in units)	53.5		46.2
Common units outstanding, end of quarter (millions) (in units)	53.5		46.2

[1] There were no equity earnings from GTN and Bison in the 2011 period as the 25 percent interests in each were acquired in May 2011.

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CONSOLIDATED STATEMENT OF CASH FLOWS (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012		Mar. 31, 2011
Cash Generated From Operations
Net income	$ 39	[1]	$ 42	[1]
Depreciation	3		4
Decrease/(increase) in operating working capital (Note 8)	7		(1)
Total cash generated from operations	49		44
Investing Activities
Capital expenditures			(3)
Total investing activities	4		(2)
Financing Activities
Distributions paid (Note 7)	(42)		(35)
Long-term debt repaid (Note 5)	(35)		(8)
Total financing activities	(77)		(43)
Decrease in cash and cash equivalents	(24)		(1)
Cash and cash equivalents, beginning of period	29		4
Cash and cash equivalents, end of period	5		3
Great Lakes
Cash Generated From Operations
Equity earnings in excess of cumulative distributions from Great Lakes			(1)
Investing Activities
Cumulative distributions in excess of equity earnings:	2
Investment in Great Lakes (Note 3)	(4)		(4)
Northern Border
Investing Activities
Cumulative distributions in excess of equity earnings:	5		5
Bison
Investing Activities
Cumulative distributions in excess of equity earnings:	$ 1

[1] There were no equity earnings from GTN and Bison in the 2011 period as the 25 percent interests in each were acquired in May 2011.

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NET INCOME PER COMMON UNIT (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended										3 Months Ended
	Mar. 31, 2012		Mar. 31, 2011		Mar. 31, 2012 GTN	May 31, 2011 GTN	May 03, 2011 GTN	Mar. 31, 2012 Bison	May 31, 2011 Bison	May 03, 2011 Bison	Mar. 31, 2012 General Partner
Common units and interest in the partnership
Additional percentage investment held by General Partner (as a percent)											2.00%
Ownership interest at the end of the period (as a percent)					25.00%	25.00%	25.00%	25.00%	25.00%	25.00%
Net income	$ 39	[1]	$ 42	[1]
Net income allocated to General Partner	(1)		(1)
Net income allocable to common units	$ 38		$ 41
Weighted average common units outstanding	53.5		46.2
Net income per common unit (in dollars per unit)	$ 0.71		$ 0.90

[1] There were no equity earnings from GTN and Bison in the 2011 period as the 25 percent interests in each were acquired in May 2011.

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SUBSEQUENT EVENTS

3 Months Ended

Mar. 31, 2012

SUBSEQUENT EVENTS

SUBSEQUENT EVENTS

NOTE 14                      SUBSEQUENT EVENTS

On April 24, 2012, the board of directors of our General Partner declared the Partnership’s first quarter 2012 cash distribution in the amount of $0.77 per common unit payable on May 15, 2012 to unitholders of record as of May 4, 2012. Great Lakes declared its first quarter 2012 distribution of $27 million on April 20, 2012, of which the Partnership will receive its 46.45 percent share or $12 million on May 1, 2012.

Northern Border declared its first quarter 2012 distribution of $52 million on April 20, 2012, of which the Partnership will receive its 50 percent share or $26 million on May 1, 2012.

GTN declared its first quarter 2012 distribution of $33 million on April 20, 2012, of which the Partnership will receive its 25 percent share or $8 million on May 1, 2012.

Bison declared its first quarter 2012 distribution of $17 million on April 20, 2012, of which the Partnership will receive its 25 percent share or $4 million on May 1, 2012.

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CASH DISTRIBUTIONS (Details) (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
CASH DISTRIBUTIONS
Quarterly cash distributions (in dollars per unit)	$ 0.77	$ 0.75
Cash distribution	$ 42

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INVESTMENTS IN UNCONSOLIDATED AFFILIATES (Tables)

3 Months Ended

Mar. 31, 2012

INVESTMENTS IN UNCONSOLIDATED AFFILIATES

Schedule of equity method investments in unconsolidated affiliates

	Ownership Interest at March 31, 2012			Equity Earnings from Unconsolidated Affiliates					Investment in Unconsolidated Affiliates
(unaudited)				Three Months Ended March 31,				March 31,			December 31,
(millions of dollars)				2012		2011			2012		2011
Great Lakes		46.45	%		9		18			688		686
Northern Border(a)		50	%		20		21			531		536
GTN(b)		25	%		6		-			225		225
Bison(b)		25	%		3		-			162		163
					38		39			1,606		1,610

(a)Equity earnings from Northern Border is net of the 12-year amortization of a $10 million transaction fee paid to the operator of Northern Border at the time of the Partnership’s additional 20 percent interest acquisition in April 2006.

(b) There were no equity earnings from GTN and Bison in the 2011 period as the 25 percent interests in each were acquired in May 2011.

Great Lakes

Investments in unconsolidated affiliates

Summarized financial information for equity method investment

(unaudited)	March 31,		December 31,
(millions of dollars)	2012		2011
Assets
Current assets		65		65
Plant, property and equipment, net		819		826
Other assets		1		1
		885		892
Liabilities and Partners' Equity
Current liabilities		26		30
Deferred credits		1		-
Long-term debt, including current maturities		364		373
Partners' capital		494		489
		885		892

(unaudited)	Three months ended March 31,
(millions of dollars)	2012			2011
Transmission revenues		49			70
Operating expenses		(15	)		(14	)
Depreciation		(8	)		(8	)
Financial charges and other		(7	)		(7	)
Michigan business tax		-			(2	)
Net income		19			39

Northern Border

Investments in unconsolidated affiliates

Summarized financial information for equity method investment

(unaudited)	March 31,			December 31,
(millions of dollars)	2012			2011
Assets
Cash and cash equivalents		39			33
Other current assets		37			35
Plant, property and equipment, net		1,255			1,267
Other assets		30			31
		1,361			1,366
Liabilities and Partners' Equity
Current liabilities		51			48
Deferred credits and other		14			13
Long-term debt, including current maturities		473			473
Partners' equity
Partners' capital		826			835
Accumulated other comprehensive loss		(3	)		(3	)
		1,361			1,366

(unaudited)	Three months ended March 31,
(millions of dollars)	2012			2011
Transmission revenues		81			80
Operating expenses		(18	)		(17	)
Depreciation		(16	)		(15	)
Financial charges and other		(6	)		(6	)
Net income		41			42

GTN

Investments in unconsolidated affiliates

Summarized financial information for equity method investment

(unaudited)	March 31,		December 31,
(millions of dollars)	2012		2011
Assets
Current assets		66		55
Plant, property and equipment, net		1,197		1,207
Other assets		2		1
		1,265		1,263
Liabilities and Members' Equity
Current liabilities		18		18
Deferred credits and other		20		20
Long-term debt, including current maturities		325		325
Members' capital		902		900
		1,265		1,263

(unaudited)	Three months ended March 31,
(millions of dollars)		2012(a)
Transmission revenues			52
Operating expenses			(11	)
Depreciation			(13	)
Financial charges and other			(5	)
Net income			23

(a) Comparative information not shown as GTN was not acquired until May 2011.

Bison

Investments in unconsolidated affiliates

Summarized financial information for equity method investment

(unaudited)	March 31,		December 31,
(millions of dollars)	2012		2011
Assets
Current assets		7		10
Plant, property and equipment, net		656		658
		663		668
Liabilities and Members' Equity
Current liabilities		15		17
Members' capital		648		651
		663		668

(unaudited)	Three months ended March 31,
(millions of dollars)		2012(a)
Transmission revenues			20
Operating expenses			(3	)
Depreciation			(5	)
Net income			12

(a) Comparative information not shown as Bison was not acquired until May 2011.

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CONSOLIDATED STATEMENT OF CASH FLOWS (Parenthetical)	Mar. 31, 2012	May 31, 2011	May 03, 2011
GTN
Ownership interest at the end of the period (as a percent)	25.00%	25.00%	25.00%
Bison
Ownership interest at the end of the period (as a percent)	25.00%	25.00%	25.00%

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CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012		Mar. 31, 2011
Net income	$ 39	[1]	$ 42	[1]
Other comprehensive income
Change associated with current period hedging transactions (Note 10)			4
Total comprehensive income	$ 39		$ 46

[1] There were no equity earnings from GTN and Bison in the 2011 period as the 25 percent interests in each were acquired in May 2011.

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RELATED PARTY TRANSACTIONS

3 Months Ended

Mar. 31, 2012

RELATED PARTY TRANSACTIONS

RELATED PARTY TRANSACTIONS

NOTE 9                 RELATED PARTY TRANSACTIONS

The Partnership does not have any employees. The management and operating functions are provided by the General Partner. The General Partner does not receive a management fee in connection with its management of the Partnership. The Partnership reimburses the General Partner for all costs of services provided, including the costs of employee, officer and director compensation and benefits, and all other expenses necessary or appropriate to the conduct of the business of, and allocable to, the Partnership. Such costs include (i) overhead costs (such as office space and equipment) and (ii) out-of-pocket expenses related to the provision of such services. The Partnership Agreement provides that the General Partner will determine the costs that are allocable to the Partnership in any reasonable manner determined by the General Partner in its sole discretion. Total costs charged to the Partnership by the General Partner were $1 million for the three months ended March 31, 2012 (2011 – $1 million).

As operator, TransCanada’s subsidiaries provide capital and operating services to our pipeline systems. TransCanada’s subsidiaries incur costs on behalf of our pipeline systems, including, but not limited to, employee salary and benefit costs, and property and liability insurance costs.

Capital and operating costs charged to our pipeline systems for the three months ended March 31, 2012 and 2011 by TransCanada’s subsidiaries and amounts payable to TransCanada’s subsidiaries at March 31, 2012 and December 31, 2011 are summarized in the following tables:

(unaudited)	Three months ended March 31,
(millions of dollars)	2012		2011
Capital and operating costs charged by TransCanada's subsidiaries to:
Great Lakes(a)		8		8
Northern Border(a)		8		7
GTN(a)(b)		7		-
Bison(a)(b)		2		-
North Baja		1		1
Tuscarora		1		1
Impact on the Partnership's net income:
Great Lakes(a)		4		4
Northern Border(a)		4		3
GTN(a)(b)		7		-
Bison(a)(b)		1		-
North Baja		1		1
Tuscarora		1		1

(a) Represents 100 percent of the costs.

(b) There were no amounts from GTN and Bison in the 2011 period as the 25 percent interests in each were acquired in May 2011.

(unaudited)	March 31,		December 31,
(millions of dollars)		2012		2011
Amount payable to TransCanada's subsidiaries for costs charged in the year by:
Great Lakes(a)		3		3
Northern Border(a)		3		3
GTN(a)		3		3
Bison(a)		1		1
North Baja		-		1
Tuscarora		-		1

(a) Represents 100 percent of the costs.

Great Lakes earns transportation revenues from TransCanada and its affiliates under contracts, some of which are provided at discounted rates and some at maximum recourse rates. The contracts have remaining terms ranging from one to six years. Great Lakes earned $24 million of transportation revenues under these contracts in the three months ended March 31, 2012 (2011 - $24 million). This amount represents 48 percent of total revenues earned by Great Lakes in the three months ended March 31, 2012 (2011 – 35 percent).

Revenue from TransCanada and its affiliates of $11 million is included in the Partnership’s equity earnings from Great Lakes in the three months ended March 31, 2012 (2011 - $11 million). At March 31, 2012, $8 million was included in Great Lakes’ receivables in regards to the transportation contracts with TransCanada and its affiliates (December 31, 2011 - $7 million).

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Document and Entity Information	3 Months Ended
	Mar. 31, 2012	Apr. 30, 2012
Document and Entity Information
Entity Registrant Name	TC PIPELINES LP
Entity Central Index Key	0001075607
Document Type	10-Q
Document Period End Date	Mar. 31, 2012
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		53,472,766
Document Fiscal Year Focus	2012
Document Fiscal Period Focus	Q1

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FINANCIAL INSTRUMENTS

3 Months Ended

Mar. 31, 2012

FINANCIAL INSTRUMENTS.

FINANCIAL INSTRUMENTS

NOTE 10                      FINANCIAL INSTRUMENTS

The carrying value of cash and cash equivalents, accounts receivable and other, accounts payable and accrued liabilities, and accrued interest approximate their fair values because of the short maturity or duration of these instruments, or because the instruments bear a variable rate of interest or a rate that approximates current rates. The fair value of the Partnership’s long-term debt is estimated by discounting the future cash flows of each instrument at estimated current borrowing rates. The estimated fair values of the Partnership’s and its subsidiary’s long-term debt as of March 31, 2012 is $723 million (December 31, 2011 - $763 million).

The Partnership’s long-term debt results in exposures to changing interest rates. Until December 12, 2011, the Partnership used derivatives to assist in managing its exposure to interest rate risk. For the three months ended March 31, 2012, the Partnership recorded interest expense of nil on interest rate swaps and options (2011 – $4 million).

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CONSOLIDATED BALANCE SHEET (USD $) In Millions, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Current Assets
Cash and cash equivalents	$ 5	$ 29
Accounts receivable and other (Note 11)	8	9
Total current assets	13	38
Investments in unconsolidated affiliates (Note 3)	1,606	1,610
Plant, property and equipment (Net of $142 accumulated depreciation; 2011 $139)	295	298
Goodwill	130	130
Other assets	6	6
Total assets	2,050	2,082
Current Liabilities
Accounts payable and accrued liabilities	6	5
Accrued interest	6	1
Current portion of long-term debt (Note 5)	3	3
Total current liabilities	15	9
Long-term debt (Note 5)	704	739
Other liabilities	1	1
Total liabilities	720	749
Partners' Equity
Common units	1,304	1,307
General partner	27	27
Accumulated other comprehensive loss	(1)	(1)
Total partners' equity	1,330	1,333
Total liabilities and partners' equity	$ 2,050	$ 2,082

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ACQUISITIONS

3 Months Ended

Mar. 31, 2012

ACQUISITIONS

ACQUISITIONS

NOTE 4                 ACQUISITIONS

GTN and Bison Equity Investment Acquisitions

On May 3, 2011, the Partnership acquired 25 percent interests in each of GTN and Bison from subsidiaries of TransCanada.

The total purchase price of the Acquisitions was $605 million (the Purchase Price). The Purchase Price consisted of (i) $405 million for the GTN membership interest (less $81 million, which reflected 25 percent of GTN’s outstanding debt at the time of the acquisition), (ii) $200 million for the membership interest in Bison (less a $9 million future capital commitment to complete the Bison pipeline) (iii) $23 million at closing and (iv) $1 million in working capital adjustments paid in the fourth quarter of 2011. The resulting $539 million paid by the Partnership was financed through a combination of (i) an issuance of 7,245,000 common units offered to the public at $47.58 per common unit resulting in net proceeds of $331 million, (ii) a draw of $61 million on the Partnership’s committed $400 million bridge loan facility, (iii) a draw of $125 million on the Partnership’s then existing $250 million senior revolving credit facility, (iv) a capital contribution from TC PipeLines, GP Inc. (General Partner) of $7 million, which was required to maintain the General Partner’s effective two percent general partner interest in the Partnership, and (v) approximately $15 million of cash on hand.

The Acquisitions were accounted for as transactions between entities under common control, whereby the equity investments in both GTN and Bison were recorded at TransCanada’s carrying values and the total excess purchase price paid was recorded as a reduction to Partners’ Equity.

Yuma Lateral Asset Acquisition

Pursuant to an amendment to the acquisition agreement between the Partnership and TransCanada relating to the Partnership’s acquisition of North Baja, the Partnership agreed to make an additional payment of up to $2 million to TransCanada in the event that TransCanada secured additional contracts for transportation service before December 31, 2010. TransCanada secured an additional contract in July 2010 and, as a result, the Partnership paid $2 million to TransCanada on March 25, 2011 when the facilities associated with the contract were completed.

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INVESTMENTS IN UNCONSOLIDATED AFFILIATES

3 Months Ended

Mar. 31, 2012

INVESTMENTS IN UNCONSOLIDATED AFFILIATES

INVESTMENTS IN UNCONSOLIDATED AFFILIATES

NOTE 3                 INVESTMENTS IN UNCONSOLIDATED AFFILIATES

Great Lakes, Northern Border, GTN and Bison are regulated by the Federal Energy Regulatory Commission (FERC) and are operated by TransCanada. We use the equity method of accounting for our interests in our equity investees.

	Ownership Interest at March 31, 2012			Equity Earnings from Unconsolidated Affiliates					Investment in Unconsolidated Affiliates
(unaudited)				Three Months Ended March 31,				March 31,			December 31,
(millions of dollars)				2012		2011			2012		2011
Great Lakes		46.45	%		9		18			688		686
Northern Border(a)		50	%		20		21			531		536
GTN(b)		25	%		6		-			225		225
Bison(b)		25	%		3		-			162		163
					38		39			1,606		1,610

(a)Equity earnings from Northern Border is net of the 12-year amortization of a $10 million transaction fee paid to the operator of Northern Border at the time of the Partnership’s additional 20 percent interest acquisition in April 2006.

(b) There were no equity earnings from GTN and Bison in the 2011 period as the 25 percent interests in each were acquired in May 2011.

Great Lakes

The Partnership made an equity contribution to Great Lakes of $4 million in the first quarter of 2012. This amount represents the Partnership’s 46.45 percent share of a $9 million cash call from Great Lakes to make a scheduled debt repayment.

The Partnership recorded no undistributed earnings from Great Lakes for the three months ended March 31, 2012 and 2011.

The summarized financial information for Great Lakes is as follows:

(unaudited)	March 31,		December 31,
(millions of dollars)	2012		2011
Assets
Current assets		65		65
Plant, property and equipment, net		819		826
Other assets		1		1
		885		892
Liabilities and Partners' Equity
Current liabilities		26		30
Deferred credits		1		-
Long-term debt, including current maturities		364		373
Partners' capital		494		489
		885		892

(unaudited)	Three months ended March 31,
(millions of dollars)	2012			2011
Transmission revenues		49			70
Operating expenses		(15	)		(14	)
Depreciation		(8	)		(8	)
Financial charges and other		(7	)		(7	)
Michigan business tax		-			(2	)
Net income		19			39

Northern Border

The Partnership recorded no undistributed earnings from Northern Border for the three months ended March 31, 2012 and 2011.

The summarized financial information for Northern Border is as follows:

(unaudited)	March 31,			December 31,
(millions of dollars)	2012			2011
Assets
Cash and cash equivalents		39			33
Other current assets		37			35
Plant, property and equipment, net		1,255			1,267
Other assets		30			31
		1,361			1,366
Liabilities and Partners' Equity
Current liabilities		51			48
Deferred credits and other		14			13
Long-term debt, including current maturities		473			473
Partners' equity
Partners' capital		826			835
Accumulated other comprehensive loss		(3	)		(3	)
		1,361			1,366

(unaudited)	Three months ended March 31,
(millions of dollars)	2012			2011
Transmission revenues		81			80
Operating expenses		(18	)		(17	)
Depreciation		(16	)		(15	)
Financial charges and other		(6	)		(6	)
Net income		41			42

GTN

On May 3, 2011, the Partnership acquired a 25 percent interest in GTN from a subsidiary of TransCanada. The acquisition was accounted for as a transaction between entities under common control, whereby the equity investment in GTN was recorded at TransCanada’s carrying value. See Note 4 for additional disclosure regarding the Acquisitions.

In November 2011, the FERC approved a Stipulation and Agreement of Settlement for GTN (GTN Settlement) with shippers and regulators regarding rates and terms and conditions of service without modification, effective January 1, 2012. The GTN Settlement includes a moratorium on the filing of future rate proceedings until December 31, 2015. Following the expiration of the moratorium, GTN must file a rate case such that the new rates will be effective January 1, 2016.

The Partnership recorded no undistributed earnings from GTN for the three months ended March 31, 2012.

The summarized financial information for GTN is as follows:

(unaudited)	March 31,		December 31,
(millions of dollars)	2012		2011
Assets
Current assets		66		55
Plant, property and equipment, net		1,197		1,207
Other assets		2		1
		1,265		1,263
Liabilities and Members' Equity
Current liabilities		18		18
Deferred credits and other		20		20
Long-term debt, including current maturities		325		325
Members' capital		902		900
		1,265		1,263

(unaudited)	Three months ended March 31,
(millions of dollars)		2012(a)
Transmission revenues			52
Operating expenses			(11	)
Depreciation			(13	)
Financial charges and other			(5	)
Net income			23

(a) Comparative information not shown as GTN was not acquired until May 2011.

Bison

On May 3, 2011, the Partnership acquired a 25 percent interest in Bison from a subsidiary of TransCanada. The acquisition was accounted for as a transaction between entities under common control, whereby the equity investment in Bison was recorded at TransCanada’s carrying value. See Note 4 for additional disclosure regarding the Acquisitions.

The Partnership recorded no undistributed earnings from Bison for the three months ended March 31, 2012.

The summarized financial information for Bison is as follows:

(unaudited)	March 31,		December 31,
(millions of dollars)	2012		2011
Assets
Current assets		7		10
Plant, property and equipment, net		656		658
		663		668
Liabilities and Members' Equity
Current liabilities		15		17
Members' capital		648		651
		663		668

(unaudited)	Three months ended March 31,
(millions of dollars)		2012(a)
Transmission revenues			20
Operating expenses			(3	)
Depreciation			(5	)
Net income			12

(a) Comparative information not shown as Bison was not acquired until May 2011.

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SIGNIFICANT ACCOUNTING POLICIES (Policies)

3 Months Ended

Mar. 31, 2012

SIGNIFICANT ACCOUNTING POLICIES

Basis of Presentation

(a) Basis of Presentation

The results of operations for the three months ended March 31, 2012 and 2011 are not necessarily indicative of the results that may be expected for a full fiscal year. The unaudited interim financial statements should be read in conjunction with the financial statements and notes thereto included in our Annual Report on Form 10-K for the year ended December 31, 2011. That report contains a more comprehensive summary of the Partnership’s major accounting policies. In the opinion of management, the accompanying unaudited condensed consolidated financial statements contain all of the appropriate adjustments, all of which are normally recurring adjustments unless otherwise noted, considered necessary to present fairly the financial position of the Partnership, the results of operation and cash flows for the respective periods. Our significant accounting policies are consistent with those disclosed in Note 2 of the financial statements in our Annual Report on Form 10-K for the year ended December 31, 2011. Certain items from that Note are repeated or updated below as necessary to assist in understanding these financial statements.

Amounts are stated in U.S. dollars.

Acquisitions

(b) Acquisitions

On May 3, 2011, the Partnership acquired a 25 percent membership interest in each of GTN and Bison from subsidiaries of TransCanada (Acquisitions). The Acquisitions were accounted for as transactions between entities under common control, whereby the equity investments in GTN and Bison were recorded at TransCanada’s carrying values. See Note 4 for additional disclosure regarding the Acquisitions.

Use of Estimates

 (c) Use of Estimates

The preparation of financial statements in conformity with United States of America (U.S.) generally accepted accounting principles (GAAP) requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities as of the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Although management believes these estimates are reasonable, actual results could differ from these estimates. In the opinion of management, these consolidated financial statements have been properly prepared within reasonable limits of materiality and include all adjustments (consisting of normal recurring accruals) necessary for a fair presentation of the financial results for the periods presented.

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ACCOUNTS RECEIVABLE AND OTHER

3 Months Ended

Mar. 31, 2012

ACCOUNTS RECEIVABLE AND OTHER

ACCOUNTS RECEIVABLE AND OTHER

NOTE 11                      ACCOUNTS RECEIVABLE AND OTHER

(unaudited)	March 31,		December 31,
(millions of dollars)	2012		2011
Accounts receivable		7		8
Inventory		1		1
		8		9

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CASH DISTRIBUTIONS

3 Months Ended

Mar. 31, 2012

CASH DISTRIBUTIONS

CASH DISTRIBUTIONS

NOTE 7                 CASH DISTRIBUTIONS

For the three months ended March 31, 2012, the Partnership distributed $0.77 per common unit (2011 – $0.75 per common unit) for a total of $42 million. The distributions paid for the three months ended March 31, 2012 and 2011 included no incentive distributions to the General Partner.

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CREDIT FACILITIES AND LONG-TERM DEBT

3 Months Ended

Mar. 31, 2012

CREDIT FACILITIES AND LONG-TERM DEBT

CREDIT FACILITIES AND LONG-TERM DEBT

NOTE 5                 CREDIT FACILITIES AND LONG-TERM DEBT

(unaudited)	March 31,		December 31,
(millions of dollars)	2012		2011
Senior Credit Facility due 2016		328		363
4.65% Senior Notes due 2021		349		349
6.89% Series C Senior Notes due 2012		3		3
3.82% Series D Senior Notes due 2017		27		27
		707		742
Less: current portion of long-term debt		3		3
		704		739

The Partnership’s Senior Credit Facility consists of a $500 million senior revolving credit facility with a banking syndicate, maturing July 13, 2016, under which $328 million was outstanding at March 31, 2012 (December 31, 2011 - $363 million), leaving $172 million available for future borrowing.

The London Interbank Offered Rate (LIBOR) based interest rate on the Senior Credit Facility averaged 1.65 percent for the three months ended March 31, 2012. The interest rate was 1.63 percent at March 31, 2012.

The LIBOR-based interest rate on the Senior Credit Facility averaged 0.83 percent for the three months ended March 31, 2011. After hedging activity, the LIBOR-based interest rate incurred on the Senior Credit Facility averaged 4.01 percent for the three months ended March 31, 2011. Prior to hedging activities, the LIBOR-based interest rate was 0.79 percent at March 31, 2011.

At March 31, 2012, the Partnership was in compliance with its financial covenants, in addition to the other covenants which include restrictions on entering into mergers, consolidations and sales of assets, granting liens, material amendments to the Partnership Agreement, incurring additional debt and distributions to unitholders.

The principal repayments required on the long-term debt are as follows:

(unaudited)
(millions of dollars)
2012	3
2013	3
2014	4
2015	4
2016	332
Thereafter	361
	707

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NET INCOME PER COMMON UNIT

3 Months Ended

Mar. 31, 2012

NET INCOME PER COMMON UNIT

NET INCOME PER COMMON UNIT

NOTE 6                 NET INCOME PER COMMON UNIT

Net income per common unit is computed by dividing net income, after deduction of the General Partner’s allocation, by the weighted average number of common units outstanding. The General Partner’s allocation is equal to an amount based upon the General Partner’s effective two percent general partner interest, plus an amount equal to incentive distributions. Incentive distributions are paid to the General Partner if quarterly cash distributions on the common units exceed levels specified in the Partnership Agreement.

Net income per common unit was determined as follows:

(unaudited)	Three months ended March 31,
(millions of dollars, except per unit)	2012			2011
Net income(a)		39			42
Net income allocated to General Partner		(1	)		(1	)
Net income allocable to common units		38			41
Weighted average common units outstanding (millions)		53.5			46.2
Net income per common unit		$0.71			$0.90

(a) There were no equity earnings from GTN and Bison in the 2011 period as the 25 percent interests in each were acquired in May 2011.

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CHANGE IN WORKING CAPITAL

3 Months Ended

Mar. 31, 2012

CHANGE IN WORKING CAPITAL

CHANGE IN WORKING CAPITAL

NOTE 8                 CHANGE IN WORKING CAPITAL

(unaudited)	Three months ended March 31,
(millions of dollars)	2012		2011
Decrease in accounts receivable and other		1		-
Increase/(decrease) in accounts payable and accrued liabilities		1		(2	)
Increase in accrued interest		5		1
Decrease/(increase) in operating working capital		7		(1	)

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CREDIT FACILITIES AND LONG-TERM DEBT (Details 2) (USD $) In Millions, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
Principal repayments required on long-term debt
2012	$ 3
2013	3
2014	4
2015	4
2016	332
Thereafter	361
Total long-term debt	$ 707	$ 742

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ACCOUNTING PRONOUNCEMENT

3 Months Ended

Mar. 31, 2012

ACCOUNTING PRONOUNCEMENT

ACCOUNTING PRONOUNCEMENT

NOTE 13                      ACCOUNTING PRONOUNCEMENTS

The Financial Accounting Standards Board (FASB) issued an update to Accounting Standards Codification (ASC) 350 - Intangibles - Goodwill and Other.  Adoption of this update has resulted in a change in the accounting policy related to testing goodwill for impairment, as the Partnership is now permitted under U.S. GAAP to first assess qualitative factors affecting the fair value of a reporting unit in comparison to the carrying amount as a basis for determining whether it is required to proceed to the two-step quantitative impairment test. The Partnership adopted this update effective January 1, 2012. The adoption of this update is not expected to have an impact on our annual goodwill assessment.

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NET INCOME PER COMMON UNIT (Tables)

3 Months Ended

Mar. 31, 2012

NET INCOME PER COMMON UNIT

Schedule of net income per common unit

(unaudited)	Three months ended March 31,
(millions of dollars, except per unit)	2012			2011
Net income(a)		39			42
Net income allocated to General Partner		(1	)		(1	)
Net income allocable to common units		38			41
Weighted average common units outstanding (millions)		53.5			46.2
Net income per common unit		$0.71			$0.90

(a) There were no equity earnings from GTN and Bison in the 2011 period as the 25 percent interests in each were acquired in May 2011.

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ACCOUNTS RECEIVABLE AND OTHER (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
ACCOUNTS RECEIVABLE AND OTHER
Accounts receivable	$ 7	$ 8
Inventory	1	1
Accounts receivable and other	$ 8	$ 9

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CONSOLIDATED BALANCE SHEET (Parenthetical) (USD $) In Millions, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011
CONSOLIDATED BALANCE SHEET
Plant, property and equipment, accumulated depreciation	$ 142	$ 139

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SIGNIFICANT ACCOUNTING POLICIES

3 Months Ended

Mar. 31, 2012

SIGNIFICANT ACCOUNTING POLICIES

SIGNIFICANT ACCOUNTING POLICIES

NOTE 2                 SIGNIFICANT ACCOUNTING POLICIES

(a) Basis of Presentation

The results of operations for the three months ended March 31, 2012 and 2011 are not necessarily indicative of the results that may be expected for a full fiscal year. The unaudited interim financial statements should be read in conjunction with the financial statements and notes thereto included in our Annual Report on Form 10-K for the year ended December 31, 2011. That report contains a more comprehensive summary of the Partnership’s major accounting policies. In the opinion of management, the accompanying unaudited condensed consolidated financial statements contain all of the appropriate adjustments, all of which are normally recurring adjustments unless otherwise noted, considered necessary to present fairly the financial position of the Partnership, the results of operation and cash flows for the respective periods. Our significant accounting policies are consistent with those disclosed in Note 2 of the financial statements in our Annual Report on Form 10-K for the year ended December 31, 2011. Certain items from that Note are repeated or updated below as necessary to assist in understanding these financial statements.

Amounts are stated in U.S. dollars.

(b) Acquisitions

On May 3, 2011, the Partnership acquired a 25 percent membership interest in each of GTN and Bison from subsidiaries of TransCanada (Acquisitions). The Acquisitions were accounted for as transactions between entities under common control, whereby the equity investments in GTN and Bison were recorded at TransCanada’s carrying values. See Note 4 for additional disclosure regarding the Acquisitions.

 (c) Use of Estimates

The preparation of financial statements in conformity with United States of America (U.S.) generally accepted accounting principles (GAAP) requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities as of the date of the financial statements and the reported amounts of revenues and expenses during the reporting period. Although management believes these estimates are reasonable, actual results could differ from these estimates. In the opinion of management, these consolidated financial statements have been properly prepared within reasonable limits of materiality and include all adjustments (consisting of normal recurring accruals) necessary for a fair presentation of the financial results for the periods presented.

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CHANGE IN WORKING CAPITAL (Tables)

3 Months Ended

Mar. 31, 2012

CHANGE IN WORKING CAPITAL

CHANGE IN WORKING CAPITAL

(unaudited)	Three months ended March 31,
(millions of dollars)	2012		2011
Decrease in accounts receivable and other		1		-
Increase/(decrease) in accounts payable and accrued liabilities		1		(2	)
Increase in accrued interest		5		1
Decrease/(increase) in operating working capital		7		(1	)

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RELATED PARTY TRANSACTIONS (Details) (USD $) In Millions, unless otherwise specified			3 Months Ended					3 Months Ended					3 Months Ended		3 Months Ended		3 Months Ended			3 Months Ended
	May 31, 2011 GTN	May 31, 2011 Bison	Mar. 31, 2012 General Partner	Mar. 31, 2011 General Partner	Mar. 31, 2012 TransCanada Corporation Great Lakes	Mar. 31, 2011 TransCanada Corporation Great Lakes	Dec. 31, 2011 TransCanada Corporation Great Lakes	Mar. 31, 2012 TransCanada Corporation Great Lakes Minimum Y	Mar. 31, 2012 TransCanada Corporation Great Lakes Maximum Y	Mar. 31, 2012 TransCanada Corporation Northern Border	Mar. 31, 2011 TransCanada Corporation Northern Border	Dec. 31, 2011 TransCanada Corporation Northern Border	Mar. 31, 2012 TransCanada Corporation GTN	Dec. 31, 2011 TransCanada Corporation GTN	Mar. 31, 2012 TransCanada Corporation Bison	Dec. 31, 2011 TransCanada Corporation Bison	Mar. 31, 2012 TransCanada Corporation North Baja	Mar. 31, 2011 TransCanada Corporation North Baja	Dec. 31, 2011 TransCanada Corporation North Baja	Mar. 31, 2012 TransCanada Corporation Tuscarora Gas Transmission Company	Mar. 31, 2011 TransCanada Corporation Tuscarora Gas Transmission Company	Dec. 31, 2011 TransCanada Corporation Tuscarora Gas Transmission Company
Costs charged to the pipeline system and amounts payable
Costs charged by TransCanada and its affiliates			$ 1	$ 1	$ 8	$ 8				$ 8	$ 7		$ 7		$ 2		$ 1	$ 1		$ 1	$ 1
Impact on the Partnership's net income					4	4				4	3		7		1		1	1		1	1
Amounts payable to TransCanada and its affiliates					3		3			3		3	3	3	1	1			1			1
Percentage of capital and operating costs charged by TransCanada's subsidiaries					100.00%					100.00%			100.00%		100.00%
Ownership interest at the end of the period (as a percent)	25.00%	25.00%
TransCanada and its affiliates contracts' remaining term (in years)								1	6
Transportation revenues from TransCanada and its affiliates					24	24
Percentage of transportation revenues to total revenues					48.00%	35.00%
Revenue from TransCanada and its affiliates included in the Partnership's equity income from Great Lakes					11	11
Great Lakes' receivables for transportation contracts with TransCanada and its affiliates					$ 8		$ 7

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REGULATORY MATTERS

3 Months Ended

Mar. 31, 2012

REGULATORY MATTERS

REGULATORY MATTERS

NOTE 12                      REGULATORY MATTERS

Tuscarora – On March 9, 2012, Tuscarora received approval from the FERC of the Stipulation and Agreement of Settlement (Tuscarora Settlement). The Tuscarora Settlement includes three-year contract extensions to the term of a number of contracts with Tuscarora’s largest customer, provides for new rates effective January 1, 2012, and a moratorium on the filing of future rate proceedings under NGA Sections 4 or 5 until December 31, 2014.  Pursuant to the Tuscarora Settlement, Tuscarora will have no future obligation to file a Section 4 rate case.