UNITED STATES SECURITIES AND EXCHANGE COMMISSION WASHINGTON, D.C. 20549 FORM 10-Q QUARTERLY REPORT PURSUANT TO SECTION 13 OR 15(d) OF THE SECURITIES EXCHANGE ACT OF 1934 For the quarterly period ended JUNE 30, 2000 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 (I.R.S. Employer or organization) Identification Number) 110 Turnpike Road, Suite 203 Westborough, Massachusetts 01581 - --------------------------------------- ---------------------- (Address of principal executive offices) (Zip code) 508-871-7046 -------------------------------------------------- (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 report(s), and (2) has been subject to such filing requirements for the past 90 days. Yes [X] No [ ] As of August 11, 2000 there were 14,690,694 of the registrant's common units outstanding.

TC PIPELINES, LP TABLE OF CONTENTS Page No. -------- PART I. FINANCIAL INFORMATION ITEM 1. Financial Statements Statement of Income - Three and six months ended June 30, 2000 and period May 28 - June 30, 1999 3 Balance Sheet - June 30, 2000 and December 31, 1999 3 Statement of Cash Flows - Six months ended June 30, 2000 and period May 28 - June 30, 1999 4 Notes to Condensed Financial Statements 5 ITEM 2. Management's Discussion and Analysis of Financial Condition and Results of Operations Recent Developments 8 Results of Operations of TC PipeLines, LP 8 Liquidity and Capital Resources of TC PipeLines, LP 10 Results of Operations of Northern Border Pipeline Company 11 Liquidity and Capital Resources of Northern Border Pipeline Company 14 ITEM 3. Quantitative and Qualitative Disclosures About Market Risk 16 PART II. OTHER INFORMATION ITEM 6. Exhibits and Reports on Form 8-K 17 2

PART I. FINANCIAL INFORMATION ITEM 1. FINANCIAL STATEMENTS TC PIPELINES, LP STATEMENT OF INCOME (UNAUDITED) (THOUSANDS OF DOLLARS, EXCEPT Three months ended Six months ended May 28 (1) - PER UNIT AMOUNTS) June 30, 2000 June 30, 2000 June 30, 1999 - --------------------------------------------------------------------------------------------------------------- EQUITY INCOME FROM INVESTMENT IN NORTHERN BORDER PIPELINE COMPANY 8,824 17,447 3,130 GENERAL AND ADMINISTRATIVE EXPENSES 291 570 144 ------ ------ ------ NET INCOME 8,533 16,877 2,986 ------ ------ ------ ------ ------ ------ NET INCOME ALLOCATION Common units 7,020 13,884 2,456 Subordinated units 1,342 2,655 470 General partner 171 338 60 ------ ------ ------ 8,533 16,877 2,986 ------ ------ ------ ------ ------ ------ NET INCOME PER UNIT $0.48 $0.95 $0.17 ------ ------ ------ ------ ------ ------ UNITS OUTSTANDING (THOUSANDS) 17,500 17,500 17,500 ------ ------ ------ ------ ------ ------ BALANCE SHEET June 30, 2000 December 31, (THOUSANDS OF DOLLARS) (unaudited) 1999 - ----------------------------------------------------------------------------------- ASSETS Current Assets Cash 3,313 795 ------- ------- 3,313 795 ------- ------- Investment in Northern Border Pipeline Company 248,601 250,450 Deferred Amounts 45 - ------- ------- 251,959 251,245 ------- ------- ------- ------- - ----------------------------------------------------------------------------------- LIABILITIES AND PARTNERS' CAPITAL Current Liabilities Accounts payable 315 407 ------- ------- 315 407 ------- ------- Partners' Capital Common units 209,236 208,573 Subordinated units 37,375 37,248 General partner 5,033 5,017 ------- ------- 251,644 250,838 ------- ------- 251,959 251,245 ------- ------- ------- ------- (1) Commencement of operations See accompanying Notes to Condensed Financial Statements. 3

PART I. FINANCIAL INFORMATION (CONTINUED) ITEM 1. FINANCIAL STATEMENTS (CONTINUED) TC PIPELINES, LP STATEMENT OF CASH FLOWS (UNAUDITED) Six months ended May 28 (1) - (THOUSANDS OF DOLLARS) June 30, 2000 June 30, 1999 - ----------------------------------------------------------------------------------------------- CASH GENERATED FROM OPERATIONS Net income 16,877 2,986 Add/(Deduct): Distributions received in excess of equity income 1,849 (3,130) (Increase)/decrease in operating working capital (92) 144 ------- ------ 18,634 - ------- ------ INVESTING ACTIVITIES Deferred amounts (45) - ------- ------ (45) - ------- ------ FINANCING ACTIVITIES Distributions paid (16,071) - Due to affiliate - 300 ------- ------ (16,071) 300 ------- ------ INCREASE IN CASH 2,518 300 CASH, BEGINNING OF PERIOD 795 - ------- ------ CASH, END OF PERIOD 3,313 300 ------- ------ ------- ------ (1) Commencement of operations See accompanying Notes to Condensed Financial Statements. 4

PART I. FINANCIAL INFORMATION (CONTINUED) ITEM 1. FINANCIAL STATEMENTS (CONTINUED) TC PIPELINES, LP NOTES TO CONDENSED FINANCIAL STATEMENTS (unaudited) NOTE 1 BASIS OF PRESENTATION TC PipeLines, LP, a Delaware limited partnership, and its subsidiary limited partnership, TC PipeLines Intermediate Limited Partnership, a Delaware limited partnership, are collectively referred to herein as TC PipeLines or the Partnership. The financial statements have been prepared by management in accordance with United States generally accepted accounting principles. Amounts are stated in United States dollars. Since a determination of many assets, liabilities, revenues and expenses is dependent upon future events, the preparation of these financial statements requires the use of estimates and assumptions which have been made using careful judgment. In the opinion of management, these financial statements have been properly prepared within reasonable limits of materiality and include all adjustments (consisting primarily of normal recurring accruals) necessary to present fairly the results of operations for the three and six months ended June 30, 2000 and the period May 28 to June 30, 1999, the financial position as at June 30, 2000 and December 31, 1999 and the cash flows for the six months ended June 30, 2000 and the period May 28 to June 30, 1999. The results of operations for the three and six months ended June 30, 2000 and the period May 28 to June 30, 1999 are not necessarily indicative of the results that may be expected for a full fiscal year. NOTE 2 FORMATION OF PARTNERSHIP The Partnership commenced operations on May 28, 1999 when it issued 14,300,000 common units (11,500,000 to the public and 2,800,000 to an affiliate of the general partner) for net proceeds of $274.6 million, after deducting underwriters' fees of $15.0 million. These proceeds, along with 3,200,000 subordinated units, a 2% general partner interest and incentive distribution rights, were issued to TransCanada Border PipeLine Ltd. and TransCan Northern Ltd. (collectively, the predecessor companies), affiliates of the general partner, to acquire the predecessor companies' 30% general partner interest in Northern Border Pipeline Company. On June 25, 1999, the underwriters exercised a portion of their over-allotment option under the terms of the underwriting agreement and purchased 390,694 additional common units for net proceeds of $7.5 million. The Partnership used those proceeds to redeem 390,694 subordinated units from the general partner. The common units and the subordinated units represent limited partner interests in the Partnership. During the period which subordinated units are outstanding (the subordination period), to the extent there is sufficient available cash, the holders of common units are entitled to receive a minimum quarterly distribution (MQD), plus any arrearages on the common units, before any distribution is made to the holders of subordinated units. The holders of subordinated units will have the right to receive the MQD only after the common units have received the MQD plus any arrearages in payment of the MQD. The subordinated units are not entitled to arrearages. Upon expiration of the subordination period, which will generally not occur before June 5

PART I. FINANCIAL INFORMATION (CONTINUED) ITEM 1. FINANCIAL STATEMENTS (CONTINUED) TC PIPELINES, LP 30, 2004, the subordinated units will convert into common units on a one-for-one basis and will then participate pro rata with the other common units in distributions of available cash. The holder of the general partner interest is entitled to receive 2% of total cash distributions until the MQD has been achieved, at which time it will have the right to receive incentive distributions. Incentive distribution rights represent the right to receive an increasing percentage of quarterly distributions of available cash after the MQD has been achieved. NOTE 3 INVESTMENT IN NORTHERN BORDER PIPELINE COMPANY The Partnership owns a 30% general partner interest in Northern Border Pipeline Company (Northern Border Pipeline), a partnership which owns a natural gas pipeline extending from the Montana-Saskatchewan border near Port of Morgan, Montana, to a terminus near Manhattan, Illinois. Northern Border Pipeline is subject to regulation by the Federal Energy Regulatory Commission (FERC). Northern Border Pipeline's accounting policies conform to United States generally accepted accounting principles, as applied in the case of regulated entities. The Partnership uses the equity method of accounting for its investment in Northern Border Pipeline, over which it is able to exercise significant influence. TC PipeLines' equity income for the three and six months ended June 30, 2000 and the period May 28 to June 30, 1999 represents 30% of the net income of Northern Border Pipeline for the same periods. The following sets out summarized financial information for Northern Border Pipeline for the three and six months ended June 30, 2000 and the period May 28 to June 30, 1999 and as at June 30, 2000 and December 31, 1999. TC PipeLines has held its general partner interest since May 28, 1999. (UNAUDITED) Three months ended Six months ended May 28 - (MILLIONS OF DOLLARS) June 30, 2000 June 30, 2000 June 30, 1999 - ------------------------------------------------------------------------------------------------------------------ NORTHERN BORDER PIPELINE INCOME STATEMENT Revenues 77.3 153.6 27.6 Costs and expenses (18.5) (35.3) (6.3) Depreciation (14.5) (29.4) (4.9) Financial charges and other (14.9) (30.8) (6.0) ---- ----- ---- Net income 29.4 58.1 10.4 ---- ----- ---- ---- ----- ---- 6

PART I. FINANCIAL INFORMATION (CONTINUED) ITEM 1. FINANCIAL STATEMENTS (CONCLUDED) TC PIPELINES, LP June 30, 2000 December 31, (MILLIONS OF DOLLARS) (unaudited) 1999 - -------------------------------------------------------------------------- NORTHERN BORDER PIPELINE BALANCE SHEET Cash and cash equivalents 36.2 17.3 Other current assets 36.8 33.8 Plant, property and equipment, net 1,702.7 1,731.4 Other assets 13.8 14.2 Current liabilities (126.4) (116.7) Reserves and deferred credits (10.5) (10.7) Long-term debt (823.9) (834.5) ------- ------- Partners' capital 828.7 834.8 ------- ------- ------- ------- NOTE 4 CREDIT FACILITY On May 28, 1999, the Partnership entered into a $40 million unsecured two-year revolving credit facility with TransCanada PipeLine USA Ltd., an affiliate of the general partner. At June 30, 2000, the Partnership had no amount outstanding under this credit facility. NOTE 5 NET INCOME PER UNIT Net income per unit is computed by dividing net income, after deduction of the general partner's allocation, by the number of common and subordinated units outstanding. NOTE 6 ACQUISITION On July 19, 2000, a subsidiary of TC PipeLines entered into an agreement to purchase a 49% general partner interest in Tuscarora Gas Transmission Company from an indirect subsidiary of TransCanada PipeLines Limited for $28 million. TransCanada will retain a 1% general partner interest in Tuscarora. The remaining 50% interest is held by Sierra Pacific Resources. The transaction is expected to close in the third quarter of 2000, subject to customary closing conditions. TC PipeLines plans to finance the acquisition with a combination of cash on hand and third party debt. The Partnership expects to enter into a three-year credit facility under which the Partnership would be able to borrow up to an aggregate principal amount of $30 million. The Partnership plans to use the equity method of accounting for its investment in Tuscarora. Tuscarora owns a 229-mile, 20-inch diameter interstate pipeline that transports natural gas from Malin, Oregon, where it interconnects with facilities of PG&E Gas Transmission - Northwest, to the Reno, Nevada area. Tuscarora is regulated by the FERC and is subject to the FERC's rules, regulations and accounting procedures. 7

PART I. FINANCIAL INFORMATION (CONTINUED) ITEM 2. MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS TC PIPELINES, LP RECENT DEVELOPMENTS ACQUISITION On July 19, 2000, a subsidiary of TC PipeLines, LP (TC PipeLines or the Partnership) entered into an agreement to purchase a 49% general partner interest in Tuscarora Gas Transmission Company (Tuscarora) from an indirect subsidiary of TransCanada PipeLines Limited (TransCanada) for $28 million. TransCanada will retain a 1% general partner interest in Tuscarora. The remaining 50% interest is held by Sierra Pacific Resources. The transaction is expected to close in the third quarter of 2000, subject to customary closing conditions. TC PipeLines plans to finance the acquisition with a combination of cash on hand and third party debt. The Partnership expects to enter into a three-year credit facility under which the Partnership would be able to borrow up to an aggregate principal amount of $30 million. Tuscarora owns a 229-mile, 20-inch diameter interstate pipeline that transports natural gas from Malin, Oregon, where it interconnects with facilities of PG&E Gas Transmission - Northwest, to the Reno, Nevada area. Tuscarora is regulated by the Federal Energy Regulatory Commission (FERC) and is subject to the FERC's rules, regulations and accounting procedures. RESULTS OF OPERATIONS OF TC PIPELINES, LP TC PipeLines was formed by TransCanada to acquire, own and participate in the management of United States based pipeline assets. On May 28, 1999, the Partnership issued 14,300,000 common units (11,500,000 to the public and 2,800,000 to an affiliate of the general partner) through its initial public offering for net proceeds of $274.6 million. The Partnership used the net proceeds from this offering, along with 3,200,000 subordinated units, an aggregate 2% general partner interest and incentive distribution rights, to acquire the collective 30% general partner interest in Northern Border Pipeline previously held by TransCanada Border PipeLine Ltd. and TransCan Northern Ltd. (collectively, the predecessor companies), affiliates of the general partner, TC PipeLines GP, Inc. The remaining 70% general partner interest in Northern Border Pipeline is held by Northern Border Partners, L.P., a publicly traded limited partnership that is not affiliated with TC PipeLines. Subsequent to the initial public offering, the underwriters exercised a portion of their over-allotment option and purchased 390,694 additional common units for net proceeds of $7.5 million. The Partnership used these proceeds to redeem an equal number of subordinated units held by the general partner. Currently, the only material asset of the Partnership is the 30% general partner interest in Northern Border Pipeline. TC PipeLines accounts for its interest in Northern Border Pipeline using the equity method of accounting. The Partnership's initial investment in Northern Border Pipeline was recorded at $241.7 million, the combined carrying values of the investment in Northern Border Pipeline as reflected in the accounts of the predecessor companies as 8

PART I. FINANCIAL INFORMATION (CONTINUED) ITEM 2. MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS (CONTINUED) TC PIPELINES, LP at May 28, 1999. This amount equated to 30% of Northern Border Pipeline's partners' capital as at May 28, 1999. Since the general partner interest in Northern Border Pipeline is currently the Partnership's only source of income, the Partnership's results of operations are influenced by and reflect the same factors that influence the financial results of Northern Border Pipeline. SECOND QUARTER 2000 COMPARED WITH PERIOD MAY 28 TO JUNE 30, 1999 Equity income from the Partnership's investment in Northern Border Pipeline increased $5.7 million to $8.8 million for the three months ended June 30, 2000, compared to equity income of $3.1 million for the period from May 28 to June 30, 1999. The increase in equity income reflects a full three months of activity in the second quarter of 2000, compared to approximately one month of activity in the second quarter of 1999. (TC PipeLines acquired its 30% general partner interest in Northern Border Pipeline on May 28, 1999). In addition, equity income is higher due to income earned from third-party usage of capacity on Northern Border Pipeline's microwave system. This is partially offset by a decrease in equity income due to a decline in Northern Border Pipeline's rate base in 2000 compared to 1999. TC PipeLines reported general and administrative expense of $0.3 million for the three months ended June 30, 2000 compared to $0.1 million for the period from May 28 to June 30, 1999. The Partnership began operations on May 28, 1999 and therefore, was only in operation for approximately one month in the second quarter of 1999. SIX MONTHS ENDED JUNE 30, 2000 COMPARED WITH PERIOD MAY 28 TO JUNE 30, 1999 Equity income from the Partnership's investment in Northern Border Pipeline was $17.4 million for the first half of 2000, compared to $3.1 million for the period from May 28 to June 30, 1999. The $14.3 million increase in equity income reflects a full six months of activity in the first half of 2000 compared to approximately one month of activity in the first half of 1999. (TC PipeLines acquired its 30% general partner interest in Northern Border Pipeline on May 28, 1999.) In addition, equity income is higher due to income earned from third-party usage of capacity on Northern Border Pipeline's microwave system. This is partially offset by a decrease in equity income due to a decline in Northern Border Pipeline's rate base in 2000 compared to 1999. TC PipeLines incurred general and administrative expense of $0.6 million for the first half of 2000, compared to $0.1 million for the period from May 28 to June 30, 1999. The Partnership began operations on May 28, 1999 and therefore, was only in operation for approximately one month in the first half of 1999. 9

PART I. FINANCIAL INFORMATION (CONTINUED) ITEM 2. MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS (CONTINUED) TC PIPELINES, LP LIQUIDITY AND CAPITAL RESOURCES OF TC PIPELINES, LP CASH DISTRIBUTION POLICY OF TC PIPELINES, LP During the subordination period, which generally cannot end before June 30, 2004, the Partnership will make distributions of available cash as defined in the partnership agreement in the following manner: - First, 98% to the common units, pro rata, and 2% to the general partner, until there has been distributed for each outstanding common unit an amount equal to the minimum quarterly distribution for that quarter; - Second, 98% to the common units, pro rata, and 2% to the general partner, until there has been distributed for each outstanding common unit an amount equal to any arrearages in payment of the minimum quarterly distribution on the common units for that quarter and for any prior quarters during the subordination period; - Third, 98% to the subordinated units, pro rata, and 2% to the general partner, until there has been distributed for each outstanding subordinated unit an amount equal to the minimum quarterly distribution for that quarter; and - Thereafter, in a manner whereby the general partner has rights (referred to as incentive distribution rights) to receive increasing percentages of excess quarterly distributions over specified distribution thresholds. SECOND QUARTER 2000 On May 15, 2000, TC PipeLines paid a cash distribution of $0.45 per unit for the three months ended March 31, 2000 to unitholders of record as of April 28, 2000. This cash distribution, totaling $8.0 million, was paid out in the following manner: $6.6 million to common unitholders, $1.2 million to the general partner as holder of the subordinated units, and $0.2 million to the general partner in respect of its 2% general partner interest. The Partnership funded this cash distribution with the $10.0 million cash distribution it received from Northern Border Pipeline on May 2, 2000. The distribution from Northern Border Pipeline related to the first quarter ended March 31, 2000 and was calculated and paid in accordance with Northern Border Pipeline's cash distribution policy. On July 19, 2000, the board of directors of the general partner declared a cash distribution of $0.45 per unit for the three months ended June 30, 2000, which is payable on August 14, 2000 to unitholders of record as of July 31, 2000. This will amount to a cash distribution totaling $8.0 million, which will be paid out in the following manner: $6.6 million to common unitholders, $1.2 million to the general partner as holder of the subordinated units, and $0.2 million to the general partner in respect of its 2% general partner interest. The Partnership will fund this cash distribution with the $10.2 million cash distribution it received from Northern Border Pipeline on August 2, 2000. The distribution from Northern Border Pipeline related to the second quarter ended June 30, 2000 and was calculated and paid in accordance with Northern Border Pipeline's cash distribution policy. 10

PART I. FINANCIAL INFORMATION (CONTINUED) ITEM 2. MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS (CONTINUED) TC PIPELINES, LP CREDIT FACILITY On May 28, 1999, the Partnership entered into a $40 million unsecured two-year revolving credit facility with TransCanada PipeLine USA Ltd., an affiliate of the general partner. The credit facility bears interest at a London Interbank Offered Rate plus 1.25%. The purpose of the revolving credit facility is to provide borrowings to fund capital expenditures, to fund capital contributions to Northern Border Pipeline and for working capital and other general business purposes, including funding cash distributions to partners, if necessary. At June 30, 2000, the Partnership had no amount outstanding under this credit facility. CAPITAL REQUIREMENTS TC PipeLines plans to finance the proposed acquisition of a 49% interest in Tuscarora with a combination of cash on hand and third party debt as described under the heading "Recent Developments - Acquisition." To the extent TC PipeLines has any capital requirements with respect to its investment in Northern Border Pipeline or makes further acquisitions in 2000, TC PipeLines expects to finance these requirements with debt and/or equity. RESULTS OF OPERATIONS OF NORTHERN BORDER PIPELINE COMPANY The following sets out summarized financial information for Northern Border Pipeline for the three and six months ended June 30, 2000 and 1999 and as at June 30, 2000 and December 31, 1999. TC PipeLines, LP has held its 30% general partner interest since May 28, 1999. Three months ended Six months ended June 30, June 30, (UNAUDITED) ------------------------------------- (MILLIONS OF DOLLARS) 2000 1999 2000 1999 - -------------------------------------------------------------------------------------- NORTHERN BORDER PIPELINE INCOME STATEMENT Revenues 77.3 73.0 153.6 146.7 Costs and expenses (18.5) (16.3) (35.3) (32.9) Depreciation (14.5) (12.9) (29.4) (25.7) Financial charges and other (14.9) (14.8) (30.8) (28.8) ---- ---- ----- ----- Net income 29.4 29.0 58.1 59.3 ---- ---- ----- ----- ---- ---- ----- ----- 11

PART I. FINANCIAL INFORMATION (CONTINUED) ITEM 2. MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS (CONTINUED) TC PIPELINES, LP June 30, 2000 December 31, (MILLIONS OF DOLLARS) (unaudited) 1999 - --------------------------------------------------------------------------- NORTHERN BORDER PIPELINE BALANCE SHEET Cash and cash equivalents 36.2 17.3 Other current assets 36.8 33.8 Plant, property and equipment, net 1,702.7 1,731.4 Other assets 13.8 14.2 Current liabilities (126.4) (116.7) Reserves and deferred credits (10.5) (10.7) Long-term debt (823.9) (834.5) ------- ------- Partners' capital 828.7 834.8 ------- ------- ------- ------- Northern Border Pipeline's revenue is derived from agreements with various shippers for the transportation of natural gas. Northern Border Pipeline transports gas under a FERC regulated tariff that provides an opportunity to recover all of the operations and maintenance costs of the pipeline, taxes other than income taxes, interest, depreciation and amortization, an allowance for income taxes and a regulated return on equity. Northern Border Pipeline is generally allowed to collect from its shippers a return on regulated rate base as well as recover that rate base through depreciation and amortization. The return amount Northern Border Pipeline may collect from its shippers declines as the rate base is recovered. Billings for the firm transportation agreements are based on contracted volumes to determine the allocable share of the cost of service and are not dependent upon the percentage of available capacity actually used. Northern Border Pipeline filed a rate proceeding with the FERC in May 1999 for, among other things, a redetermination of its allowed equity rate of return. The total annual cost of service increase due to Northern Border Pipeline's proposed changes is approximately $30 million. In June 1999, the FERC issued an order in which the proposed changes were suspended until December 1, 1999, after which the proposed changes were implemented with subsequent billings subject to refund. In June 2000, Northern Border Pipeline reached an agreement in principle with a majority of its customers and the FERC staff to settle the issues in the rate case. Terms of the settlement are confidential until a stipulation and agreement is finalized by the parties and filed with the FERC for approval. For the three month and six month periods ending June 30, 2000, respectively, Northern Border Pipeline recorded a $6.7 million and $13.5 million provision for rate refunds, which reflects the anticipated refund obligation to its customers. The provision for rate refunds is netted against operating revenues on the statement of income. While the parties in the rate case are meeting to finalize the stipulation and agreement, TC PipeLines can give no assurance whether it will be filed and subsequently approved by the FERC. 12

PART I. FINANCIAL INFORMATION (CONTINUED) ITEM 2. MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS (CONTINUED) TC PIPELINES, LP SECOND QUARTER 2000 COMPARED WITH SECOND QUARTER 1999 Operating revenues, net increased $4.3 million (6%) for the second quarter of 2000, as compared to the same period in 1999, due primarily to recovery of increased operations and maintenance expense, depreciation and amortization expense and interest expense. Costs and expenses consist of operations and maintenance expenses and taxes other than income. Operations and maintenance expense increased $1.9 million (21%) for the second quarter of 2000, as compared to the same period in 1999, due primarily to expenses incurred in connection with Northern Border Pipeline's pending rate case as well as increased administrative expenses for the pipeline. Depreciation and amortization expense increased $1.6 million (13%) for the second quarter of 2000, as compared to the same period in 1999, due primarily to an increase in the depreciation rate applied to transmission plant from 2.0% to 2.3%. The increase in the depreciation rate was approved as part of a previous rate case settlement. Financial charges and other consists of interest expense and other income. Interest expense increased $1.8 million (13%) for the second quarter of 2000, as compared to the same period in 1999, due primarily to an increase in interest rates between 1999 and 2000. Other income increased $1.8 million for the second quarter of 2000, as compared to the same period in 1999, due primarily to income earned from third-party usage of capacity on Northern Border Pipeline's microwave system. SIX MONTHS JUNE 30, 2000 COMPARED WITH SIX MONTHS JUNE 30, 1999 Operating revenues, net increased $6.9 million (5%) for the first half of 2000, as compared to the same period in 1999, due primarily to recovery of increased operations and maintenance expense, depreciation and amortization expense and interest expense. Costs and expenses consist of operations and maintenance expenses and taxes other than income. Operations and maintenance expense increased $1.9 million (10%) for the first half of 2000, as compared to the same period in 1999, due primarily to expenses incurred in connection with Northern Border Pipeline's pending rate case as well as increased administrative expenses for the pipeline. Depreciation and amortization expense increased $3.7 million (14%) for the first half of 2000, as compared to the same period in 1999, due primarily to an increase in the depreciation rate applied to transmission plant from 2.0% to 2.3%. The increase in the depreciation rate was approved as part of a previous rate case settlement. 13

PART I. FINANCIAL INFORMATION (CONTINUED) ITEM 2. MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS (CONTINUED) TC PIPELINES, LP Financial charges and other consists of interest expense and other income. Interest expense increased $3.7 million (13%) for the first half of 2000, as compared to the same period in 1999, due primarily to an increase in interest rates between 1999 and 2000. Other income increased $1.7 million for the first half of 2000, as compared to the same period in 1999, due primarily to income earned from third-party usage of capacity on Northern Border Pipeline's microwave system. LIQUIDITY AND CAPITAL RESOURCES OF NORTHERN BORDER PIPELINE COMPANY GENERAL In August 1999, Northern Border Pipeline completed a private offering of $200 million of 7.75% Senior Notes due 2009, which notes were subsequently exchanged in a registered offering for notes with substantially identical terms (Senior Notes). The proceeds from the Senior Notes were used to reduce indebtedness under a June 1997 credit agreement. In June 1997, Northern Border Pipeline entered into a credit agreement (Pipeline Credit Agreement) with certain financial institutions. The Pipeline Credit Agreement is comprised of a term loan and a $200 million five-year revolving credit facility, both maturing in June 2002. At June 30, 2000, $429.0 million was outstanding under the term loan. No funds were outstanding under the revolving credit facility. At June 30, 2000, Northern Border Pipeline also had outstanding $250 million of senior notes issued in a private placement under a July 1992 note purchase agreement. The note purchase agreement provides for four series of notes, Series A through D, maturing between August 2000 and August 2003. The Series A Notes with a principal amount of $66 million mature in August 2000. Northern Border Pipeline anticipates borrowing on the revolving credit facility to repay the Series A Notes. Short-term liquidity needs will be met by internal sources and through the revolving credit facility discussed above. Long-term capital needs may be met through the ability to issue long-term indebtedness. CASH FLOWS FROM OPERATING ACTIVITIES Cash flows provided by operating activities increased $14.0 million to $97.3 million for the first half of 2000, as compared to the same period in 1999, primarily due to recovery of increased depreciation and amortization expense and the billings collected subject to refund related to Northern Border Pipeline's current rate proceeding. 14

PART I. FINANCIAL INFORMATION (CONTINUED) ITEM 2. MANAGEMENT'S DISCUSSION AND ANALYSIS OF FINANCIAL CONDITION AND RESULTS OF OPERATIONS (CONCLUDED) TC PIPELINES, LP CASH FLOWS FROM INVESTING ACTIVITIES Capital expenditures of $3.8 million for the first half of 2000 included $2.3 million for Project 2000, an expansion and 34-mile extension of Northern Border Pipeline's existing natural gas pipeline system expected to be placed in service in November 2001. The capital expenditures for Project 2000 are estimated to be approximately $94 million. For the comparable period in 1999, capital expenditures were $77.0 million and included $70.4 for The Chicago Project, which was Northern Border Pipeline's expansion and extension project placed in service in December 1998. The remaining capital expenditures for 2000 and 1999 were primarily related to renewals and replacements of existing facilities. Total capital expenditures for 2000 are estimated to be $21 million, including $10 million for Project 2000. The remaining capital expenditures planned for 2000 are for renewals and replacements of existing facilities. Northern Border Pipeline currently anticipates funding its 2000 capital expenditures primarily by using internal sources and borrowing on the revolving credit facility. CASH FLOWS FROM FINANCING ACTIVITIES Cash flows used in financing activities were $74.6 million for the first half of 2000, as compared to $17.8 million for the same period in 1999. Distributions paid to the general partners decreased $3.5 million to $64.3 million for the first half of 2000 as compared to the same period of 1999. The distribution for 1999 included seven months' activity, rather than six months, resulting from a change in the timing of distribution payments. Borrowings under the Pipeline Credit Agreement decreased $50 million for the first half of 2000 as compared to the same period in 1999. Borrowings in 1999 were used to finance a portion of the capital expenditures for The Chicago Project. Repayments on the Pipeline Credit Agreement increased $10.0 million for the first half of 2000 as compared to the same period in 1999. INFORMATION REGARDING FORWARD-LOOKING STATEMENTS Certain statements in this Quarterly Report are forward-looking and relate to, among other things, anticipated financial performance, business prospects and strategies. Forward-looking information typically contains statements with words such as "anticipate," "believe," "estimate," "expect," "plan," "target," or similar words suggesting future outcomes. By their nature, such statements are subject to various risks and uncertainties that could cause TC PipeLines, LP's actual results and experience to differ materially from the anticipated results. Such risks and uncertainties include, but are not limited to: TC PipeLines, LP's success in completing the acquisition of a 49% interest in Tuscarora Gas Transmission Company, regulatory decisions, particularly those of the FERC, including Northern Border Pipeline's efforts to finalize settlement of its current rate case; future demand for natural gas; cost of acquisitions, including related debt service payments; tariff and transportation charges to be collected by Northern Border Pipeline for transportation services on the Northern Border pipeline system; overcapacity in the industry; and prevailing economic conditions, particularly conditions of the capital and equity markets. TC PipeLines, LP cannot give any assurance that the Partnership will be able to complete the proposed Tuscarora acquisition or any other future acquisitions on economically and operationally acceptable terms and that any future acquisitions will not be dilutive to earnings and operating surplus. 15

PART I. FINANCIAL INFORMATION (CONCLUDED) ITEM 3. QUANTITATIVE AND QUALITATIVE DISCLOSURES ABOUT MARKET RISK TC PIPELINES, LP For the three and six months ended June 30, 2000 and the period May 28 to June 30, 1999, TC PipeLines, LP has not entered into any forms of financial instruments that are market risk sensitive, either for trading or non-trading purposes. Therefore, TC PipeLines, LP is not exposed to any interest rate risk, market price risk, or foreign exchange risk, except to the extent that its 30% general partner interest in Northern Border Pipeline exposes the Partnership to the market risks disclosed below. Northern Border Pipeline's interest rate exposure results from the portion of its debt portfolio that is subject to variable rates. To mitigate potential fluctuations in interest rates, Northern Border Pipeline maintains a significant portion of its debt portfolio in fixed rate debt. Northern Border Pipeline also uses interest rate swap agreements to manage its level of exposure to interest rate changes. Since December 31, 1999, there has not been any material change in Northern Border Pipeline's interest rate exposure. 16

PART II. OTHER INFORMATION ITEM 6. EXHIBITS AND REPORTS ON FORM 8-K TC PIPELINES, LP (a) Exhibits. None. (b) Reports on Form 8-K None. 17

SIGNATURES Pursuant to the requirements of the Securities and Exchange Act of 1934, the Registrant has duly caused this report to be signed on its behalf by the undersigned thereunto duly authorized. TC PIPELINES, LP (a Delaware Limited Partnership) By: TC PipeLines GP, Inc., its general partner By: /s/ Theresa Jang ------------------------------------ Date: August 11, 2000 Theresa Jang Controller 18

  

5 THIS SCHEDULE CONTAINS SUMMARY FINANCIAL INFORMATION EXTRACTED FROM THE BALANCE SHEET AND INCOME STATEMENT FOUND IN PAGE 3 OF THIS PARTNERSHIP'S FORM 10-Q FOR THE YEAR-TO-DATE, AND IS QUALIFIED IN ITS ENTIRETY BY REFERENCE TO SUCH FINANCIAL STATEMENTS. 1,000 6-MOS DEC-31-2000 JAN-01-2000 JUN-30-2000 3,313 0 0 0 0 3,313 0 0 251,959 315 0 0 0 0 251,644 251,959 0 0 0 0 0 0 0 0 0 16,877 0 0 0 16,877 0.95 0.95