<PAGE>

                                                                     EXHIBIT 3.1

                         AMENDED AND RESTATED AGREEMENT

                                       OF

                               LIMITED PARTNERSHIP

                                       OF

                NORTHERN BORDER INTERMEDIATE LIMITED PARTNERSHIP

<PAGE>

                                TABLE OF CONTENTS

<TABLE>
<S>                                                          <C>
ARTICLE I-ORGANIZATIONAL MATTERS                              1
    1.1  FORMATION AND CONTINUATION ......................    1
    1.2  NAME ............................................    1
    1.3  REGISTERED OFFICE; PRINCIPAL OFFICE .............    2
    1.4  POWER OF ATTORNEY ...............................    2
    1.5  TERM ............................................    3
    1.6  POSSIBLE RESTRICTIONS ON TRANSFER ...............    3

ARTICLE II-DEFINITIONS ...................................    3
    "ADDITIONAL LIMITED PARTNER" .........................    3
    "ADJUSTED CAPITAL ACCOUNT" ...........................    3
    "ADJUSTED PROPERTY" ..................................    4
    "ADMINISTRATIVE SERVICES AGREEMENT" ..................    4
    "AFFILIATE" ..........................................    4
    "AGREED ALLOCATION" ..................................    4
    "AGREED VALUE" .......................................    4
    "AGREEMENT" ..........................................    5
    "ARBITRATOR" .........................................    5
    "AUDIT COMMITTEE" ....................................    5
    "AUTHORIZED OFFICER" .................................    5
    "AVAILABLE CASH" .....................................    5
    "BOOK-TAX DISPARITY" .................................    6
    "BUSINESS DAY" .......................................    6
    "CAPITAL ACCOUNT" ....................................    6
    "CAPITAL CONTRIBUTION" ...............................    6
    "CARRYING VALUE" .....................................    6
    "CERTIFICATE OF LIMITED PARTNERSHIP" .................    6
    "CLOSING DATE" .......................................    6
    "CODE" ...............................................    6
    "COMMON UNIT" ........................................    7
    "CONTRIBUTED PROPERTY" ...............................    7
    "CONVEYANCE AGREEMENT" ...............................    7
    "CREDIT AGREEMENT" ...................................    7
    "CURATIVE ALLOCATION" ................................    7
    "DELAWARE ACT" .......................................    7
    "DEPARTING PARTNER" ..................................    7
    "ECONOMIC RISK OF LOSS" ..............................    7
    "ENRON" ..............................................    7
    "EVENT OF WITHDRAWAL" ................................    7
    "GENERAL PARTNERS" ...................................    7
    "GENERAL PARTNER PERCENTAGE INTEREST" ................    7
    "INDEMNITTEE" ........................................    7
    "INDEMNITY AGREEMENT" ................................    8
    "INITIAL LIMITED PARTNERS" ...........................    8
    "INITIAL SUBSTITUTED LIMITED PARTNER" ................    8
    "LIMITED PARTNER" ....................................    8
    "LIQUIDATION DATE" ...................................    8
    "LIQUIDATOR" .........................................    8
    "MERGER AGREEMENT" ...................................    8
    "MLP" ................................................    8
    "MLP AGREEMENT" ......................................    8
    "NBPL CAPITAL PROJECT" ...............................    8
</TABLE>

                                       -i-

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<TABLE>
<S>                                                          <C>
    "NBPL MANAGEMENT COMMITTEE" ..........................    8
    "NET AGREED VALUE" ...................................    8
    "NET INCOME" .........................................    9
    "NET LOSS" ...........................................    9
    "NET TERMINATION GAIN" ...............................    9
    "NET TERMINATION LOSS" ...............................    9
    "NONRECOURSE BUILT-IN GAIN" ..........................   10
    "NONRECOURSE DEDUCTIONS" .............................   10
    "NONRECOURSE LIABILITY" ..............................   10
    "NORTHERN BORDER PIPELINE" ...........................   10
    "NORTHERN BORDER PIPELINE PARTNERSHIP AGREEMENT" .....   10
    "NORTHERN PLAINS" ....................................   10
    "NORTHWEST BORDER" ...................................   10
    "OPINION OF COUNSEL" .................................   10
    "ORGANIZATIONAL LIMITED PARTNER" .....................   10
    "PAN BORDER" .........................................   10
    "PANHANDLE" ..........................................   10
    "PARTNER NONRECOURSE DEBT" ...........................   10
    "PARTNER NONRECOURSE DEBT MINIMUM GAIN" ..............   10
    "PARTNER NONRECOURSE DEDUCTIONS" .....................   11
    "PARTNERS" ...........................................   11
    "PARTNERSHIP" ........................................   11
    "PARTNERSHIP INTEREST" ...............................   11
    "PARTNERSHIP MINIMUM GAIN" ...........................   11
    "PARTNERSHIP POLICY COMMITTEE" .......................   11
    "PERCENTAGE INTEREST" ................................   11
    "PERSON" .............................................   11
    "RECAPTURE INCOME" ...................................   11
    "REGISTRATION STATEMENT" .............................   11
    "REQUIRED ALLOCATIONS" ...............................   11
    "RESIDUAL GAIN" ......................................   11
    "RESIDUAL LOSS" ......................................   11
    "SECURITIES ACT" .....................................   11
    "SPECIAL APPROVAL" ...................................   12
    "SUBSTITUTED LIMITED PARTNER" ........................   12
    "SURVIVING BUSINESS ENTITY" ..........................   12
    "UNDERWRITER" ........................................   12
    "UNDERWRITING AGREEMENT" .............................   12
    "UNREALIZED GAIN" ....................................   12
    "UNREALIZED LOSS" ....................................   12
    "WILLIAMS" ...........................................   12
    "WITHDRAWAL OPINION OF COUNSEL" ......................   12

ARTICLE III-PURPOSE ......................................   12
    3.1  PURPOSE AND BUSINESS ............................   12
    3.2  POWERS ..........................................   13

ARTICLE IV-CAPITAL CONTRIBUTIONS .........................   13
    4.1  CONTRIBUTIONS BY THE GENERAL PARTNERS ...........   13
    4.2  ADDITIONAL CAPITAL CONTRIBUTIONS ................   13
    4.3  NO PREEMPTIVE RIGHTS ............................   13
    4.4  CAPITAL ACCOUNTS ................................   14
    4.5  INTEREST ........................................   16
    4.6  NO WITHDRAWAL ...................................   16
</TABLE>

                                      -ii-

<PAGE>

<TABLE>
<S>                                                                                                   <C>
    4.7  LOANS FROM PARTNERS ......................................................................   16

ARTICLE V-ALLOCATIONS AND DISTRIBUTIONS ...........................................................   16
    5.1  ALLOCATIONS FOR CAPITAL ACCOUNT PURPOSES .................................................   16
         (a)  Net Income ..........................................................................   16
         (b)  Net Losses ..........................................................................   17
         (c)  Net Termination Gains and Losses ....................................................   17
         (d)  Special Allocations .................................................................   18
              (i)       Partnership Minimum Gain Chargeback .......................................   18
              (ii)      Chargeback of Partner Nonrecourse Debt Minimum Gain .......................   18
              (iii)     Qualified Income Offset ...................................................   18
              (iv)      Gross Income Allocations ..................................................   18
              (v)       Nonrecourse Deductions ....................................................   19
              (vi)      Partner Nonrecourse Deductions ............................................   19
              (vii)     Nonrecourse Liabilities ...................................................   19
              (viii)    Code Section 754 Adjustments ..............................................   19
              (ix)      Curative Allocation .......................................................   19
    5.2  ALLOCATIONS FOR TAX PURPOSES .............................................................   20
    5.3  REQUIREMENT AND CHARACTERIZATION OF DISTRIBUTIONS ........................................   22

ARTICLE VI-MANAGEMENT AND OPERATION OF BUSINESS ...................................................   22
    6.1  PARTNERSHIP POLICY COMMITTEE .............................................................   22
    6.2  MANAGEMENT ...............................................................................   24
    6.3  CERTIFICATE OF LIMITED PARTNERSHIP .......................................................   26
    6.4  RESTRICTIONS ON THE PARTNERSHIP POLICY COMMITTEE'S AUTHORITY .............................   26
    6.5  REIMBURSEMENT OF THE GENERAL PARTNERS, THE MEMBERS OF THE PARTNERSHIP
         POLICY COMMITTEE AND THE PARTNERSHIP'S REPRESENTATIVES ON THE NBPL
         MANAGEMENT COMMITTEE .....................................................................   27
    6.6  OUTSIDE ACTIVITIES .......................................................................   28
    6.7  LOANS TO AND FROM THE GENERAL PARTNERS; CONTRACTS WITH AFFILIATES ........................   28
    6.8  INDEMNIFICATION ..........................................................................   30
    6.9  LIABILITY OF INDEMNITEES .................................................................   31
   6.10  RESOLUTION OF CONFLICTS OF INTEREST ......................................................   32
   6.11  OTHER MATTERS CONCERNING THE GENERAL PARTNERS AND THE PARTNERSHIP POLICY COMMITTEE .......   33
   6.12  TITLE TO PARTNERSHIP ASSETS ..............................................................   34
   6.13  SPECIAL PROVISIONS REGARDING PARTNERSHIP'S INTEREST IN NORTHERN BORDER PIPELINE ..........   34
   6.14  RELIANCE BY THIRD PARTIES ................................................................   35

ARTICLE VII-RIGHTS AND OBLIGATIONS OF LIMITED PARTNERS ............................................   35
    7.1  LIMITATION OF LIABILITY ..................................................................   35
    7.2  MANAGEMENT OF BUSINESS ...................................................................   35
    7.3  RETURN OF CAPITAL ........................................................................   36
    7.4  RIGHTS OF LIMITED PARTNERS RELATING TO THE PARTNERSHIP ...................................   36

ARTICLE VIII-BOOKS, RECORDS, ACCOUNTING AND REPORTS ...............................................   37
    8.1  RECORDS AND ACCOUNTING ...................................................................   37
    8.2  FISCAL YEAR ..............................................................................   37

ARTICLE IX-TAX MATTERS ............................................................................   37
    9.1  PREPARATION OF TAX RETURNS ...............................................................   37
    9.2  TAX ELECTIONS ............................................................................   37
    9.3  TAX CONTROVERSIES ........................................................................   37
</TABLE>

                                      -iii-

<PAGE>

<TABLE>
<S>                                                                                                   <C>
    9.4  ORGANIZATIONAL EXPENSES ..................................................................   37
    9.5  WITHHOLDING ..............................................................................   38
    9.6  OPINIONS OF COUNSEL ......................................................................   38

ARTICLE X-TRANSFER OF INTERESTS ...................................................................   38
   10.1  TRANSFER .................................................................................   38
   10.2  TRANSFER OF A GENERAL PARTNER'S PARTNERSHIP INTEREST .....................................   38
   10.3  TRANSFER OF THE LIMITED PARTNER'S PARTNERSHIP INTEREST ...................................   38

ARTICLE XI-ADMISSION OF PARTNERS ..................................................................   39
   11.1  ADMISSION OF INITIAL LIMITED PARTNERS AND INITIAL SUBSTITUTED LIMITED PARTNER ............   39
   11.2  ADMISSION OF SUBSTITUTED LIMITED PARTNER .................................................   39
   11.3  ADMISSION OF SUCCESSOR GENERAL PARTNER ...................................................   39
   11.4  ADMISSION OF ADDITIONAL LIMITED PARTNERS .................................................   39
   11.5  AMENDMENT OF AGREEMENT AND CERTIFICATE OF LIMITED PARTNERSHIP ............................   40

ARTICLE XII-WITHDRAWAL OR REMOVAL OF PARTNERS .....................................................   40
   12.1  WITHDRAWAL OF A GENERAL PARTNER ..........................................................   40
   12.2  REMOVAL OF A GENERAL PARTNER .............................................................   41
   12.3  INTEREST OF DEPARTING PARTNER AND SUCCESSOR GENERAL PARTNER ..............................   42
   12.4  REIMBURSEMENT OF DEPARTING PARTNER .......................................................   42
   12.5  WITHDRAWAL OF THE LIMITED PARTNER ........................................................   42

ARTICLE XIII-DISSOLUTION AND LIQUIDATION ..........................................................   42
   13.1  DISSOLUTION ..............................................................................   42
   13.2  CONTINUATION OF THE BUSINESS OF THE PARTNERSHIP AFTER DISSOLUTION ........................   43
   13.3  LIQUIDATION ..............................................................................   44
   13.4  DISTRIBUTIONS IN KIND ....................................................................   44
   13.5  CANCELLATION OF CERTIFICATE OF LIMITED PARTNERSHIP .......................................   45
   13.6  REASONABLE TIME FOR WINDING UP ...........................................................   45
   13.7  RETURN OF CAPITAL ........................................................................   45
   13.8  NO CAPITAL ACCOUNT RESTORATION ...........................................................   45
   13.9  WAIVER OF PARTITION ......................................................................   45

ARTICLE XIV-AMENDMENT OF PARTNERSHIP AGREEMENT ....................................................   45
   14.1  AMENDMENT TO BE ADOPTED SOLELY BY PARTNERSHIP POLICY COMMITTEE ...........................   45
   14.2  AMENDMENT PROCEDURES .....................................................................   46

ARTICLE XV-MERGER .................................................................................   46
   15.1  AUTHORITY ................................................................................   46
   15.2  PROCEDURE FOR MERGER OR CONSOLIDATION ....................................................   47
   15.3  APPROVAL BY LIMITED PARTNERS OF MERGER OR CONSOLIDATION ..................................   47
   15.4  CERTIFICATE OF MERGER ....................................................................   48
   15.5  EFFECT OF MERGER .........................................................................   48

ARTICLE XVI-GENERAL PROVISIONS ....................................................................   48
   16.1  ADDRESSES AND NOTICES ....................................................................   48
   16.2  REFERENCES ...............................................................................   49
   16.3  PRONOUNS AND PLURALS .....................................................................   49
   16.4  FURTHER ACTION ...........................................................................   49
   16.5  BINDING EFFECT ...........................................................................   49
   16.6  INTEGRATION ..............................................................................   49
   16.7  CREDITORS ................................................................................   49
   16.8  WAIVER ...................................................................................   49
</TABLE>

                                      -iv-

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<TABLE>
<S>                                                                                                   <C>
   16.9  COUNTERPARTS .............................................................................   49
   16.10 APPLICABLE LAW ...........................................................................   49
   16.11 INVALIDITY OF PROVISIONS .................................................................   49
</TABLE>

                                      -v-
<PAGE>

            AMENDED AND RESTATED AGREEMENT OF LIMITED PARTNERSHIP OF
                NORTHERN BORDER INTERMEDIATE LIMITED PARTNERSHIP

      THIS AMENDED AND RESTATED AGREEMENT OF LIMITED PARTNERSHIP OF NORTHERN
BORDER INTERMEDIATE LIMITED PARTNERSHIP, dated as of October 1, 1993, is entered
into by and among Northern Plains Natural Gas Company, a Delaware corporation,
Pan Border Gas Company, a Delaware corporation, and Northwest Border Pipeline
Company, a Delaware corporation, each in its capacity as a General Partner and
as an Initial Limited Partner, Northwest Border Pipeline Company, a Delaware
corporation, in its capacity as the Organizational Limited Partner, and Northern
Border Partners, L.P. a Delaware limited partnership, as the Initial
Substituted Limited Partner, together with any other Persons who become Partners
in the Partnership or parties hereto as provided herein. In consideration of the
covenants, conditions and agreements contained herein, the parties hereto hereby
agree as follows:

                                    ARTICLE I
                             ORGANIZATIONAL MATTERS

      1.1   FORMATION AND CONTINUATION. (a) The General Partners and the
Organizational Limited Partner have previously formed the Partnership as a
limited partnership pursuant to the provisions of the Delaware Act and, together
with the Initial Limited Partners and the Initial Substituted Limited Partner,
hereby amend and restate the original Agreement of Limited Partnership of
Northern Border Intermediate Limited Partnership in its entirety. Subject to the
provisions of this Agreement, the General Partners, the Initial Limited
Partners, the Initial Substituted Limited Partner and the Organizational Limited
Partner hereby continue the Partnership as a limited partnership pursuant to the
provisions of the Delaware Act. Except as expressly provided to the contrary in
this Agreement, the rights and obligations of the Partners and the
administration, dissolution and termination of the Partnership shall be governed
by the Delaware Act. All Partnership Interests shall constitute personal
property of the owner thereof for all purposes.

      (b)   In connection with the formation of the Partnership, Northern
Plains, Pan Border and Northwest Border have been admitted as general partners
of the Partnership (each owning a general partner interest in the Partnership
equal to its General Partner Percentage Interest), and the Organizational
Limited Partner has been admitted as a limited partner of the Partnership. As of
the Closing Date, after giving effect to the transactions contemplated by
Section 4.1, the limited partner interest in the Partnership of the
Organizational Limited Partner shall be terminated and the Organizational
Limited Partner shall withdraw as a Limited Partner of the Partnership.

      1.2   NAME. The name of the Partnership shall be, and the business of the
Partnership shall be conducted under the name of, "Northern Border Intermediate
Limited Partnership " The Partnership's business may be conducted under any
other name or names deemed necessary or appropriate by the Partnership Policy
Committee. The words "Limited Partnership," "L.P.," "Ltd." or similar words or
letters shall be included in the Partnership's name where necessary for the
purposes of complying with the laws of any jurisdiction that so requires. The
Partnership Policy Committee in its sole discretion may change the name of the
Partnership at any time and from time to time and shall notify the Limited
Partners of such change in the next regular communication to Limited Partners.

                                        1

<PAGE>

      1.3   REGISTERED OFFICE; PRINCIPAL OFFICE. Unless and until changed by the
Partnership Policy Committee, the registered office of the Partnership in the
State of Delaware shall be located at The Corporation Trust Center, 1209 Orange
Street, New Castle County, Wilmington, Delaware 19801, and the registered agent
for service of process on the Partnership in the State of Delaware at such
registered office shall be The Corporation Trust Company. The principal office
of the Partnership shall be located at 1400 Smith Street, Houston, Texas 77002,
or such other place as the Partnership Policy Committee may from time to time
designate by notice to the Limited Partners. The Partnership may maintain
offices at such other place or places within or outside the State of Delaware as
the Partnership Policy Committee deems necessary or appropriate.

      1.4   POWER OF ATTORNEY. (a) Each Limited Partner hereby constitutes and
appoints each member of the Partnership Policy Committee and, if a Liquidator
shall have been selected pursuant to Section 13.3, the Liquidator severally (and
any successor to either thereof by merger, transfer, assignment, election or
otherwise) and each of their authorized officers and attorneys-in-fact, with
full power of substitution, as his true and lawful agent and attorney-in-fact,
with full power and authority in his name, place and stead, to:

            (i) execute, swear to, acknowledge, deliver, file and record in the
      appropriate public offices (A) all certificates, documents and other
      instruments (including, without limitation, this Agreement and the
      Certificate of Limited Partnership and all amendments or restatements
      thereof) that the Partnership Policy Committee or the Liquidator deems
      necessary or appropriate to form, qualify or continue the existence or
      qualification of the Partnership as a limited partnership (or a
      partnership in which the limited partners have limited liability) in the
      State of Delaware and in all other jurisdictions in which the Partnership
      may conduct business or own property; (B) all certificates, documents and
      other instruments that the Partnership Policy Committee or the Liquidator
      deems necessary or appropriate to reflect, in accordance with its terms,
      any amendment, change, modification or restatement of this Agreement; (C)
      all certificates, documents and other instruments (including, without
      limitation, conveyances and a certificate of cancellation) that the
      Partnership Policy Committee or the Liquidator deems necessary or
      appropriate to reflect the dissolution and liquidation of the Partnership
      pursuant to the terms of this Agreement; (D) all certificates, documents
      and other instruments relating to the admission, withdrawal, removal or
      substitution of any Partner pursuant to, or other events described in,
      Article X, XI, XII or XIII or the Capital Contribution of any Partner; (E)
      all certificates, documents and other instruments relating to the
      determination of the rights, preferences and privileges of any class or
      series of Partnership Interests; and (F) all certificates, documents and
      other instruments (including, without limitation, agreements and a
      certificate of merger) relating to a merger or consolidation of the
      Partnership pursuant to Article XV; and

            (ii) execute, swear to, acknowledge, deliver, file and record all
      ballots, consents, approvals, waivers, certificates, documents and other
      instruments necessary or appropriate, in the sole discretion of the
      Partnership Policy Committee or the Liquidator, to make, evidence, give,
      confirm or ratify any vote, consent, approval, agreement or other action
      that is made or given by the Partners hereunder or is consistent with the
      terms of this Agreement or is necessary or appropriate, in the sole
      discretion of the Partnership Policy Committee or the Liquidator, to
      effectuate the terms or intent of this Agreement; provided, that when the
      consent or approval of the Limited Partners is required by any provision
      of this Agreement, the Partnership Policy Committee or the Liquidator may
      exercise the power of attorney made in this Section 1.4(a)(ii) only after
      the necessary consent or approval of the Limited Partners is obtained.

                                        2

<PAGE>

Nothing contained in this Section 1.4(a) shall be construed as authorizing the
Partnership Policy Committee to amend this Agreement except in accordance with
Article XIV or as may be otherwise expressly provided for in this Agreement.

      (b)   The foregoing power of attorney is hereby declared to be irrevocable
and a power coupled with an interest, and it shall survive and not be affected
by the subsequent death, incompetency, disability, incapacity, dissolution,
bankruptcy or termination of a Limited Partner and the transfer of all or any
portion of such Limited Partner's Partnership Interest and shall extend to such
Limited Partner's heirs, successors, assigns and personal representatives. Each
Limited Partner hereby agrees to be bound by any representation made by the
Partnership Policy Committee or the Liquidator acting in good faith pursuant to
such power of attorney; and each Limited Partner hereby waives any and all
defenses that may be available to contest, negate or disaffirm the action of the
Partnership Policy Committee or the Liquidator taken in good faith under such
power of attorney. Each Limited Partner shall execute and deliver to the
Partnership Policy Committee or the Liquidator, within 15 days after receipt of
the Partnership Policy Committee's or the Liquidator's request therefor, such
further designation, powers of attorney and other instruments as the Partnership
Policy Committee or the Liquidator deems necessary to effectuate this Agreement
and the purposes of the Partnership.

      1.5   TERM. The Partnership commenced upon the filing of the Certificate
of Limited Partnership in accordance with the Delaware Act and shall continue in
existence until the close of Partnership business on December 31, 2083, or until
the earlier termination of the Partnership in accordance with the provisions of
Article XIII.

      1.6   POSSIBLE RESTRICTIONS ON TRANSFER. Notwithstanding anything to the
contrary contained in this Agreement, in the event of (a) the enactment (or
imminent enactment) of any legislation, (b) the publication of any temporary or
final regulation by the Treasury Department, (c) any ruling by the Internal
Revenue Service or (d) any judicial decision, that, in any such case, in the
Opinion of Counsel, would result in the taxation of the Partnership or Northern
Border Pipeline as an association taxable as a corporation or would otherwise
result in the Partnership or Northern Border Pipeline being taxed as an entity
for federal income tax purposes, then, the Partnership Policy Committee may
impose such restrictions on the transfer of Partnership Interests as may be
required, in the Opinion of Counsel, to prevent the Partnership or Northern
Border Pipeline from being taxed as an association taxable as a corporation or
otherwise as an entity for federal income tax purposes, including, without
limitation, making such amendments to this Agreement as the Partnership Policy
Committee in its sole discretion may determine to be necessary or appropriate to
impose such restrictions.

                                   ARTICLE II
                                  DEFINITIONS

      The following definitions shall be for all purposes, unless otherwise
clearly indicated to the contrary, applied to the terms used in this Agreement.

            "ADDITIONAL LIMITED PARTNER" means a Person admitted to the
      Partnership as a Limited Partner pursuant to Section 11.4 and who is shown
      as such on the books and records of the Partnership.

            "ADJUSTED CAPITAL ACCOUNT" means the Capital Account maintained for
      each Partner as of the end of each fiscal year of the Partnership, (a)
      increased by any amounts that such

                                        3

<PAGE>

      Partner is obligated to restore under the standards set by Treasury
      Regulation Section 1.704-1 (b)(2)(ii)(c) (or is deemed obligated to
      restore under Treasury Regulation Sections 1.704-2(g) and 1.704-2(i)(5))
      and (b) decreased by (i) the amount of all losses and deductions that, as
      of the end of such fiscal year, are reasonably expected to be allocated to
      such Partner in subsequent years under Sections 704(e)(2) and 706(d) of
      the Code and Treasury Regulation Section 1.751 -1 (b)(2)(ii), and (ii) the
      amount of all distributions that, as of the end of such fiscal year, are
      reasonably expected to be made to such Partner in subsequent years in
      accordance with the terms of this Agreement or otherwise to the extent
      they exceed offsetting increases to such Partner's Capital Account that
      are reasonably expected to occur during (or prior to) the year in which
      such distributions are reasonably expected to be made (other than
      increases as a result of a minimum gain chargeback pursuant to Section
      5.1 (d)(i) or 5.1 (d)(ii)) The foregoing definition of Adjusted Capital
      Account is intended to comply with the provisions of Treasury Regulation
      Section 1.704-1 (b)(2)(ii)(d) and shall be interpreted consistently
      therewith.

            "ADJUSTED PROPERTY" means any property the Carrying Value of which
      has been adjusted pursuant to Section 4.4(d)(i) or 4.4(d)(ii) Once an
      Adjusted Property is deemed distributed by, and recontributed to, the
      Partnership for federal income tax purposes upon a termination thereof
      pursuant to Section 708 of the Code, such property shall thereafter
      constitute a Contributed Property until the Carrying Value of such
      property is subsequently adjusted pursuant to Section 4.4(d)(i) or 4.4(d)
      (ii).

            "ADMINISTRATIVE SERVICES AGREEMENT" means that certain
      Administrative Services Agreement, dated the Closing Date, among NBP
      Services Corporation, a Delaware corporation, the Partnership and the MLP.

            "AFFILIATE" means, with respect to any Person, any other Person that
      directly or indirectly controls, is controlled by or is under common
      control with, the Person in question. As used herein, the term "control"
      means the possession, directly or indirectly, of the power to direct or
      cause the direction of the management and policies of a Person, whether
      through ownership of voting securities, by contract or otherwise.

            "AGREED ALLOCATION" means any allocation, other than a Required
      Allocation, of an item of income, gain, loss or deduction pursuant to the
      provisions of Section 5.1, including, without limitation, a Curative
      Allocation (if appropriate to the context in which the term "Agreed
      Allocation" is used).

            "AGREED VALUE" of any Contributed Property means the fair market
      value of such property or other consideration at the time of contribution
      as determined by the Partnership Policy Committee using such reasonable
      method of valuation as it may adopt; provided, however, that the Agreed
      Value of any property deemed contributed to the Partnership for federal
      income tax purposes upon termination and reconstitution thereof pursuant
      to Section 708 of the Code shall be determined in accordance with Section
      4.4(c). Subject to Section 4.4(c), the Partnership Policy Committee shall,
      in its sole discretion, use such method as it deems reasonable and
      appropriate to allocate the aggregate Agreed Value of Contributed
      Properties contributed to the Partnership in a single or integrated
      transaction among each separate property on a basis proportional to the
      fair market value of each Contributed Property.

                                        4

<PAGE>

            "AGREEMENT" means this Amended and Restated Agreement of Limited
      Partnership of Northern Border Intermediate Limited Partnership, as it may
      be amended, supplemented or restated from time to time.

            "ARBITRATOR" has the meaning assigned to such term in Section 6.1(b)
      (iii)(A).

            "AUDIT COMMITTEE" means a committee consisting of two persons
      appointed by the Partnership Policy Committee who are neither officers nor
      employees of any General Partner or any of their Affiliates, and the same
      persons who serve as the Audit Committee under the MLP Agreement may serve
      as the Audit Committee under this Agreement.

            "AUTHORIZED OFFICER" means the Chief Executive Officer and the Chief
      Financial and Accounting Officer and such other officers as may be
      authorized from time to time by the Partnership Policy Committee to
      execute contracts, certificates and other instruments on behalf of the
      Partnership.

            "AVAILABLE CASH" means, with respect to any calendar quarter and
      without duplication:

                  (a)   the sum of:

                        (i) all cash receipts of the Partnership during such
                  quarter from all sources (including, without limitation,
                  distributions of cash received by the Partnership in respect
                  of its interest in Northern Border Pipeline), plus, in the
                  case of the calendar quarter ending December 31, 1993, the
                  cash balance of the Partnership as of the close of business on
                  the Closing Date; and

                        (ii) any reduction in a reserve with respect to such
                  quarter from the level of such reserve at the end of the prior
                  quarter;

                  (b)   less the sum of:

                        (i) all cash disbursements of the Partnership during
                  such quarter, including, without limitation, disbursements for
                  operating expenses, taxes, if any, debt service (including,
                  without limitation, the payment of principal, premium and
                  interest), capital expenditures and contributions, if any, to
                  Northern Border Pipeline (but excluding all cash distributions
                  to Partners and any cash disbursements with respect to which,
                  and to the extent that, a reserve was established in a prior
                  quarter); and

                        (ii) any reserves established with respect to such
                  quarter, and any increase in reserves established with respect
                  to prior quarters, in such amounts as the Partnership Policy
                  Committee determines in its reasonable discretion to be
                  necessary or appropriate (x) to provide for the proper conduct
                  of the business of the Partnership (including, without
                  limitation, reserves for future capital expenditures or
                  capital contributions to Northern Border Pipeline) or (y)
                  because the distribution of such amounts would be prohibited
                  by applicable law or by any loan agreement, security
                  agreement, mortgage, debt instrument or other agreement or
                  obligation to which the Partnership is a party or by which it
                  is bound or its assets are subject

                                        5

<PAGE>

      Notwithstanding the foregoing, "Available Cash" with respect to any
      calendar quarter (A) shall not include any cash receipts or reductions in
      reserves or take into account any disbursements made or reserves
      established after the Liquidation Date and (B) shall include any
      distributions of cash (to the extent such distributions are attributable
      to transactions and operations during such quarter) received by the
      Partnership in respect of its interest in Northern Border Pipeline after
      the end of such quarter but on or before the date on which the Partnership
      makes its distribution of Available Cash in respect of such quarter
      pursuant to Section 5.3.

            "BOOK-TAX DISPARITY" means with respect to any item of Contributed
      Property or Adjusted Property, as of the date of any determination, the
      difference between the Carrying Value of such Contributed Property or
      Adjusted Property and the adjusted basis thereof for federal income tax
      purposes as of such date. A Partner's share of the Partnership's Book-Tax
      Disparities in all of its Contributed Property and Adjusted Property will
      be reflected by the difference between such Partner's Capital Account
      balance as maintained pursuant to Section 4.4 and the hypothetical balance
      of such Partner's Capital Account computed as if it had been maintained
      strictly in accordance with federal income tax accounting principles.

            "BUSINESS DAY" means Monday through Friday of each week, except that
      a legal holiday recognized as such by the government of the United States
      or the states of New York or Texas shall not be regarded as a Business
      Day.

            "CAPITAL ACCOUNT" means the capital account maintained for a Partner
      pursuant to Section 4.4.

            "CAPITAL CONTRIBUTION" means any cash, cash equivalents or the Net
      Agreed Value of Contributed Property that a Partner contributes to the
      Partnership pursuant to the Conveyance Agreement or Sections 4.1 or 4.2.

            "CARRYING VALUE" means (a) with respect to a Contributed Property,
      the Agreed Value of such property reduced (but not below zero) by all
      depreciation, amortization and cost recovery deductions charged to the
      Partners' Capital Accounts in respect of such Contributed Property, and
      (b) with respect to any other Partnership property, the adjusted basis of
      such property for federal income tax purposes, all as of the time of
      determination. The Carrying Value of any property shall be adjusted from
      time to time in accordance with Sections 4.4(d)(i) and 4.4(d)(ii) and to
      reflect changes, additions or other adjustments to the Carrying Value for
      dispositions and acquisitions of Partnership properties, as deemed
      appropriate by the Partnership Policy Committee.

            "CERTIFICATE OF LIMITED PARTNERSHIP" means the Certificate of
      Limited Partnership filed with the Secretary of State of the State of
      Delaware as referenced in Section 6.3, as such Certificate of Limited
      Partnership may be amended, supplemented or restated from time to time.

            "CLOSING DATE" means the first date on which Common Units are sold
      by Northern Plains and Pan Border to the Underwriters pursuant to the
      provisions of the Underwriting Agreement.

            "CODE" means the Internal Revenue Code of 1986, as amended and in
      effect from time to time, as interpreted by the applicable regulations
      thereunder. Any reference herein

                                        6

<PAGE>

      to a specific section or sections of the Code shall be deemed to include a
      reference to any corresponding provision of future law.

            "COMMON UNIT" has the meaning assigned to such term in the MLP
      Agreement.

            "CONTRIBUTED PROPERTY" means each property or other asset, in such
      form as may be permitted by the Delaware Act, but excluding cash,
      contributed to the Partnership (or deemed contributed to the Partnership
      on termination and reconstitution thereof pursuant to Section 708 of the
      Code). Once the Carrying Value of a Contributed Property is adjusted
      pursuant to Section 4.4(d), such property shall no longer constitute a
      Contributed Property, but shall be deemed an Adjusted Property.

            "CONVEYANCE AGREEMENT" has the meaning assigned to such term in the
      MLP Agreement.

            "CREDIT AGREEMENT" means the Credit Agreement dated as of October 1,
      1993, among the Partnership, as Borrower, Northern Plains, Pan Border and
      Northwest Border, as Lenders, and NB Services Corporation, as agent for
      the Lenders.

            "CURATIVE ALLOCATION" means any allocation of an item of income,
      gain, deduction, loss or credit pursuant to the provisions of Section
      5.1(d)(ix).

            "DELAWARE ACT" means the Delaware Revised Uniform Limited
      Partnership Act, 6 Del C Section 17-101, et seq., as amended, supplemented
      or restated from time to time, and any successor to such statute.

            "DEPARTING PARTNER" means a General Partner with respect to which an
      Event of Withdrawal of the type described in Section 12.1 has occurred.

            "ECONOMIC RISK OF LOSS" has the meaning set forth in Treasury
      Regulation Section 1.752-2(a).

            "ENRON" means Enron Corp. , a Delaware corporation.

            "EVENT OF WITHDRAWAL" HAS the meaning assigned to such term in
      Section 12.1(a).

            "GENERAL PARTNERS" means Northern Plains, Pan Border and Northwest
      Border, as the initial general partners of the Partnership, and any Person
      or Persons that either (i) acquires the general partner interest of such
      Person in the Partnership pursuant to and in accordance with the terms of
      Section 10.2 or (ii) is approved as a successor General Partner pursuant
      to Section 12.1 or 12.2 and, in either case, is admitted to the
      Partnership as a general partner in accordance with the terms of Section
      11.3.

            "GENERAL PARTNER PERCENTAGE INTEREST" means (a) as to Northern
      Plains and its permitted successors and assigns, 0.50505%, (b) as to Pan
      Border and its permitted successors and assigns, 0.32828%, and (c) as to
      Northwest Border and its permitted successors and assigns, 0.17677%.

            "INDEMNITEE" means any General Partner, any member of the
      Partnership Policy Committee, any representative of the Partnership on the
      NBP Management Committee, any

                                        7

<PAGE>

      Departing Partner, any Person who is or was an Affiliate of any General
      Partner or any Departing Partner, any Person who is or was an officer,
      director, employee, partner, agent or trustee of any General Partner, the
      Partnership or any Departing Partner or any such Affiliate, or any Person
      who is or was serving at the request of any General Partner, the
      Partnership Policy Committee or any Departing Partner or any such
      Affiliate as a director, officer, employee, partner, agent or trustee of
      another Person.

            "INDEMNITY AGREEMENT" means the Indemnity Agreement dated as of
      September 23, 1993 among Northern Plains, Pan Border and Northwest Border.

            "INITIAL LIMITED PARTNERS "means Northern Plains, Pan Border and
      Northwest Border, upon being admitted to the Partnership as limited
      partners in accordance with Section 11.1.

            "INITIAL SUBSTITUTED LIMITED PARTNER" means the MLP, upon being
      admitted to the Partnership as a limited partner in accordance with
      Section 11.1.

            "LIMITED PARTNER" means the Organizational Limited Partner, each
      Initial Limited Partner, the Initial Substituted Limited Partner, each
      Substituted Limited Partner, each Additional Limited Partner and any
      Departing Partner upon the change of its status from General Partner to
      Limited Partner pursuant to Section 12.3.

            "LIQUIDATION DATE" means (a) in the case of an event giving rise to
      the dissolution of the Partnership of the type described in clauses (a)
      and (b) of the first sentence of Section 13.2, the date on which the
      applicable time period during which the Partners have the right to elect
      to reconstitute the Partnership and continue its business has expired
      without such an election being made, and (b) in the case of any other
      event giving rise to the dissolution of the Partnership, the date on which
      such event occurs.

            "LIQUIDATOR" means the Partnership Policy Committee or other Person
      approved pursuant to Section 13.3 who performs the functions described
      therein.

            "MERGER AGREEMENT" has the meaning assigned to such term in Section
      15.1.

            "MLP" means Northern Border Partners, L.P. , a Delaware limited
      partnership.

            "MLP AGREEMENT" means the Amended and Restated Agreement of Limited
      Partnership of Northern Border Partners, L.P., as it may be amended,
      supplemented or restated from time to time.

            "NBPL CAPITAL PROJECT" means any project considered by the NBP
      Management Committee that would require capital contributions to be made
      by the Partnership to Northern Border Pipeline, including, without
      limitation, any projects providing for the expansion or extension of the
      pipeline system owned by Northern Border Pipeline on the Closing Date.

            "NBPL MANAGEMENT COMMITTEE" means the management committee
      responsible for management of the business and affairs of Northern Border
      Pipeline pursuant to the terms of the Northern Border Pipeline Partnership
      Agreement.

            "NET AGREED VALUE" means, (a) in the case of any Contributed
      Property, the Agreed Value of such property reduced by any liabilities
      either assumed by the Partnership upon such contribution or to which such
      property is subject when contributed, and (b) in the case

                                        8

<PAGE>

      of any property distributed to a Partner by the Partnership, the
      Partnership's Carrying Value of such property (as adjusted pursuant to
      Section 4.4(d)(ii)) at the time such property is distributed, reduced by
      any indebtedness either assumed by such Partner upon such distribution or
      to which such property is subject at the time of distribution, in either
      case, as determined under Section 752 of the Code.

            "NET INCOME" means, for any taxable period, the excess, if any, of
      the Partnership's items of income and gain (other than those items
      attributable to dispositions constituting Termination Capital
      Transactions) for such taxable period over the Partnership's items of loss
      and deduction (other than those items attributable to dispositions
      constituting Termination Capital Transactions) for such taxable period.
      The items included in the calculation of Net Income shall be determined in
      accordance with Section 4.4(b) and shall not include any items specially
      allocated under Section 5.1(d). Once an item of income, gain, loss or
      deduction that has been included in the initial computation of Net Income
      is subjected to a Required Allocation or a Curative Allocation, Net Income
      or Net Loss, whichever the case may be, shall be recomputed without regard
      to such item.

            "NET LOSS" means, for any taxable period, the excess, if any, of the
      Partnership's items of loss and deduction (other than those items
      attributable to dispositions constituting Termination Capital
      Transactions) for such taxable period over the Partnership's items of
      income and gain (other than those items attributable to dispositions
      constituting Termination Capital Transactions) for such taxable period.
      The items included in the calculation of Net Loss shall be determined in
      accordance with Section 4.4(b) and shall not include any items specially
      allocated under Section 5.1(d). Once an item of income, gain, loss or
      deduction that has been included in the initial computation of Net Loss is
      subjected to a Required Allocation or a Curative Allocation, Net Income,
      or Net Loss, whichever the case may be, shall be recomputed without regard
      to such item.

            "NET TERMINATION GAIN" means, for any taxable period, the sum, if
      positive, of all items of income, gain, loss or deduction recognized by
      the Partnership (including, without limitation, such amounts recognized
      through Northern Border Pipeline) from Termination Capital Transactions
      occurring in such taxable period. The items included in the determination
      of Net Termination Gain shall be determined in accordance with Section
      4.4 (b) and shall not include any items of income, gain or loss specially
      allocated under Section 5.1(d). Once an item of income, gain or loss that
      has been included in the initial computation of Net Termination Gain is
      subjected to a Required Allocation or a Curative Allocation, Net
      Termination Gain or Net Termination Loss, whichever the case may be, shall
      be recomputed without regard to such item.

            "NET TERMINATION LOSS" means, for any taxable period, the sum, if
      negative, of all items of income, gain, loss or deduction recognized by
      the Partnership (including, without limitation, such amounts recognized
      through Northern Border Pipeline) from Termination Capital Transactions
      occurring in such taxable period. The items included in the determination
      of Net Termination Loss shall be determined in accordance with Section
      4.4 (b) and shall not include any items of income, gain or loss specially
      allocated under Section 5.1(d). Once an item of gain or loss that has been
      included in the initial computation of Net Termination Loss is subjected
      to a Required Allocation or a Curative Allocation, Net Termination Gain or
      Net Termination Loss, whichever the case may be, shall be recomputed
      without regard to such item.

                                        9

<PAGE>

            "NONRECOURSE BUILT-IN GAIN" means with respect to any Contributed
      Properties or Adjusted Properties that are subject to a mortgage or pledge
      securing a Nonrecourse Liability, the amount of any taxable gain that
      would be allocated to the Partners pursuant to Sections 5.2(b)(i)(A), 5.2
      (b)(ii)(A) or 5.2(b)(iv) if such properties were disposed of in a taxable
      transaction in full satisfaction of such liabilities and for no other
      consideration.

            "NONRECOURSE DEDUCTIONS" means any and all items of loss, deduction
      or expenditures (described in Section 705(a)(2)(B) of the Code) that, in
      accordance with the principles of Treasury Regulation Section 1.704-2(b),
      are attributable to a Nonrecourse Liability.

            "NONRECOURSE LIABILITY" has the meaning set forth in Treasury
      Regulation Section 1.752-1 (a) (2).

            "NORTHERN BORDER PIPELINE" means Northern Border Pipeline Company, a
      Texas general partnership among Northern Plains, Pan Border, Northwest
      Border, TransCanada Border Pipeline Ltd., a Nevada corporation, and
      TransCan Northern Ltd., a Delaware corporation.

            "NORTHERN BORDER PIPELINE PARTNERSHIP AGREEMENT" means that certain
      General Partnership Agreement of Northern Border Pipeline Company dated
      effective as of March 9, 1978, among Northern Plains, Pan Border,
      Northwest Border, TransCanada Border PipeLine Ltd. and TransCan Northern
      Ltd., as amended and supplemented.

            "NORTHERN PLAINS" means Northern Plains Natural Gas Company, a
      Delaware corporation.

            "NORTHWEST BORDER" means Northwest Border Pipeline Company, a
      Delaware corporation.

            "OPINION OF COUNSEL" means a written opinion of counsel (who may be
      regular counsel to any of the General Partners, their Affiliates or the
      Partnership) acceptable to the Partnership Policy Committee.

            "ORGANIZATIONAL LIMITED PARTNER" means Northwest Border, in its
      capacity as the organizational limited partner of the Partnership pursuant
      to this Agreement, it being recognized that Northern Plains was such
      organizational limited partner at the time of the original Agreement of
      Limited Partnership of Northern Border Intermediate Limited Partnership
      but previously has transferred its rights in such capacity to Northwest
      Border.

            "PAN BORDER" means Pan Border Gas Company, a Delaware corporation.

            "PANHANDLE" means Panhandle Eastern Corporation, a Delaware
      corporation.

            "PARTNER NONRECOURSE DEBT" has the meaning set forth in Treasury
      Regulation Section 1.704-2(b)(4).

            "PARTNER NONRECOURSE DEBT MINIMUM GAIN" has the meaning set forth in
      Treasury Regulation Section 1.704-2(1)(2).

                                       10

<PAGE>

            "PARTNER NONRECOURSE DEDUCTIONS" means any and all items of loss,
      deduction or expenditure (including, without limitation, any expenditure
      described in Section 705(a)(2)(B) of the Code) that, in accordance with
      the principles of Treasury Regulation Section 1.704-2(i), are attributable
      to a Partner Nonrecourse Debt.

            "PARTNERS" means the General Partners and the Limited Partners.

            "PARTNERSHIP" means the limited partnership heretofore formed and
      continued pursuant to this Agreement.

            "PARTNERSHIP INTEREST" means the interest of a Partner in the
      Partnership.

            "PARTNERSHIP MINIMUM GAIN" means that amount determined in
      accordance with the principles of Treasury Regulation Section 1.704-2(d).

            "PARTNERSHIP POLICY COMMITTEE" has the meaning assigned to such term
      in Section 6.1.

            "PERCENTAGE INTEREST" means, as of the date of determination, (a) as
      to a General Partner, its General Partner Percentage Interest, (b) as to a
      Limited Partner, 98.9899% multiplied by a fraction equal to the portion of
      the Partnership Interests of all Limited Partners represented by the
      Partnership Interests of such Limited Partner.

            "PERSON" means an individual or a corporation, partnership, trust,
      unincorporated organization, association or other entity.

            "RECAPTURE INCOME" means any gain recognized by the Partnership
      (computed without regard to any adjustment required by Sections 734 or 743
      of the Code) upon the disposition of any property or asset of the
      Partnership, which gain is characterized as ordinary income because it
      represents the recapture of deductions previously taken with respect to
      such property or asset.

            "REGISTRATION STATEMENT" means the Registration Statement on Form
      S-1 (Registration No. 33-66158), as it has been or as it may be amended or
      supplemented from time to time, filed by the MLP with the Securities and
      Exchange Commission under the Securities Act to register the offering and
      sale of the Common Units in the Initial Offering.

            "REQUIRED ALLOCATIONS" means any allocation (or limitation imposed
      on any allocation) of an item of income, gain, deduction or loss pursuant
      to (a) Section 5.1(b)(i) or (b) Sections 5.1(d)(i)-(vi) and (viii), such
      allocations (or limitations thereon) being directly or indirectly required
      by the Treasury regulations promulgated under Section 704(b) of the Code.

            "RESIDUAL GAIN" or "RESIDUAL LOSS" means any item of gain or loss,
      as the case may be, of the Partnership recognized for federal income tax
      purposes resulting from a sale, exchange or other disposition of a
      Contributed Property or Adjusted Property, to the extent such item of gain
      or loss is not allocated pursuant to Sections 5.2(b)(i)(A) or 5.2(b)(ii)
      (A), respectively, to eliminate Book-Tax Disparities.

            "SECURITIES ACT" means the Securities Act of 1933, as amended,
      supplemented or restated from time to time and any successor to such
      statute.

                                       11

<PAGE>

            "SPECIAL APPROVAL" means approval by the Audit Committee.

            "SUBSTITUTED LIMITED PARTNER" means a Person who is admitted as a
      Limited Partner to the Partnership pursuant to Section 11.2 in place of
      and with all the rights of a Limited Partner and who is shown as a Limited
      Partner on the books and records of the Partnership.

            "SURVIVING BUSINESS ENTITY" has the meaning assigned to such term in
      Section 15.2(b).

            "UNDERWRITER" means each Person named as an underwriter in Schedule
      I to the Underwriting Agreement who purchases Common Units pursuant
      thereto.

            "Underwriting Agreement" means the Underwriting Agreement dated
      September 23, 1993, among the Underwriters, the Partnership, Northern
      Plains, Pan Border, the MLP, Panhandle, and Enron providing for the
      purchase of Common Units by such Underwriters.

            "UNREALIZED GAIN" attributable to any item of Partnership property
      means, as of any date of determination, the excess, if any, of (a) the
      fair market value of such property as of such date (as determined under
      Section 4.4(d)) over (b) the Carrying Value of such property as of such
      date (prior to any adjustment to be made pursuant to Section 4.4(d) as of
      such date).

            "UNREALIZED LOSS" attributable to any item of Partnership property
      means, as of any date of determination, the excess, if any, of (a) the
      Carrying Value of such property as of such date (prior to any adjustment
      to be made pursuant to Section 4.4(d) as of such date) over (b) the fair
      market value of such property as of such date (as determined under Section
      4.4(d)).

            "WILLIAMS" means The Williams Companies, Inc., a Delaware
      corporation.

            "WITHDRAWAL OPINION OF COUNSEL" has the meaning assigned to such
      term in Section 12.1(b).

                                  ARTICLE III
                                    PURPOSE

      3.1   PURPOSE AND BUSINESS. The purpose and nature of the business to be
conducted by the Partnership shall be (a) to serve as a general partner in
Northern Border Pipeline and, in connection therewith, to exercise all of the
rights and powers conferred upon the Partnership as a general partner in
Northern Border Pipeline pursuant to the Northern Border Pipeline Partnership
Agreement or otherwise, (b) to engage directly in, or to enter into or form any
corporation, limited liability company, partnership, joint venture or other
arrangement to engage indirectly in, any business activity that is approved by
unanimous vote of the Partnership Policy Committee and which lawfully may be
conducted by a limited partnership organized pursuant to the Delaware Act and,
in connection therewith, to exercise all of the rights and powers conferred upon
the Partnership pursuant to the agreements relating to such business activity,
and (c) to do anything necessary or appropriate to the foregoing, including,
without limitation, the making of capital contributions or loans to Northern
Border Pipeline (including, without limitation, those contributions or loans
that may be required in connection with its involvement in the activities
referred to in clause (b) of this sentence). The Partnership Policy Committee
has no obligation or duty to the Partnership or the Limited Partners

                                       12

<PAGE>

The Partnership Policy Committee has no obligation or duty to the Partnership or
the Limited Partners to propose or approve, and in its sole discretion may
decline to propose or approve, the conduct by the Partnership of any business.

      3.2   POWERS. The Partnership shall be empowered to do any and all acts
and things necessary, appropriate, proper, advisable, incidental to or
convenient for the furtherance and accomplishment of the purposes and business
described in Section 3.1 and for the protection and benefit of the Partnership.

                                   ARTICLE IV
                             CAPITAL CONTRIBUTIONS

      4.1   CONTRIBUTIONS BY THE GENERAL PARTNERS. On the Closing Date, as set
forth in the Conveyance Agreement, (i) Northern Plains shall contribute,
transfer, assign and deliver to the Partnership, as a Capital Contribution, a
general partner interest in Northern Border Pipeline representing a 35%
Partner's Percentage (which term, for purposes of this Section 4.1, shall have
the meaning assigned to it in the Northern Border Pipeline Partnership
Agreement) in Northern Border Pipeline in exchange for a limited partner
interest in the Partnership representing a 49.495% Percentage Interest in the
Partnership and the continuation of its general partner interest in the
Partnership in the amount of Northern Plains' General Partner Percentage
Interest, (ii) Pan Border shall contribute, transfer, assign and deliver to the
Partnership, as a Capital Contribution, a general partner interest in Northern
Border Pipeline representing a 22.75% Partner's Percentage in Northern Border
Pipeline in exchange for a limited partner interest in the Partnership
representing a 32.1717% Percentage Interest in the Partnership and the
continuation of its general partner interest in the Partnership in the amount of
Pan Border's General Partner Percentage Interest, and (iii) Northwest Border
shall contribute, transfer, assign and deliver to the Partnership, as a Capital
Contribution, a general partner interest in Northern Border Pipeline
representing a 12.25% Partner's Percentage in Northern Border Pipeline in
exchange for a limited partner interest in the Partnership representing a
17.3232% Percentage Interest in the Partnership and the continuation of its
general partner interest in the Partnership in the amount of Northwest Border's
General Partner Percentage Interest.

      4.2   ADDITIONAL CAPITAL CONTRIBUTIONS. With the consent of the
Partnership Policy Committee, a Limited Partner may, but shall not be obligated
to, make additional Capital Contributions to the Partnership. Contemporaneously
with the making of any such additional Capital Contributions by a Limited
Partner, the General Partners shall be obligated to make additional Capital
Contributions to the Partnership (in accordance with their relative General
Partner Percentage Interests) such that the General Partners shall at all times,
in the aggregate, have at least a 1.0101% interest in each item of Partnership
income, gain, loss, deduction and credit. Except as set forth in the immediately
preceding sentence, the General Partners shall not be obligated to make any
additional Capital Contributions to the Partnership.

      4.3   NO PREEMPTIVE RIGHTS. Except as provided in Section 4.2, no Person
shall have any preemptive, preferential or other similar right with respect to
(a) additional Capital Contributions; (b) issuance or sale of any class or
series of Partnership Interests, whether unissued, held in the treasury or
hereafter created; (c) issuance of any obligations, evidences of indebtedness or
other securities of the Partnership convertible into or exchangeable for, or
carrying or accompanied by any rights to receive, purchase or subscribe to, any
such Partnership Interests; (d) issuance of any right of subscription to or
right to receive, or any warrant or option for the purchase of, any such
Partnership Interests; or (e) issuance or sale of any other securities that may
be issued or sold by the Partnership.

                                       13

<PAGE>

      4.4   CAPITAL ACCOUNTS. (a) The Partnership shall maintain for each
Partner owning a Partnership Interest a separate Capital Account with respect to
such Partnership Interest in accordance with the rules of Treasury Regulation
Section 1.704-1 (b)(2)(iv). Such Capital Account shall be increased by (i) the
amount of all Capital Contributions made to the Partnership with respect to such
Partnership Interest pursuant to this Agreement and (ii) all items of
Partnership income and gain (including, without limitation, income and gain
exempt from tax) computed in accordance with Section 4.4(b) and allocated with
respect to such Partnership Interest pursuant to Section 5.1, and decreased by
(x) the amount of cash or Net Agreed Value of all actual and deemed
distributions of cash or property made with respect to such Partnership Interest
pursuant to this Agreement and (y) all items of Partnership deduction and loss
computed in accordance with Section 4.4(b) and allocated with respect to such
Partnership Interest pursuant to Section 5.1.

      (b)   For purposes of computing the amount of any item of income, gain,
loss or deduction to be reflected in the Partners' Capital Accounts, the
determination, recognition and classification of any such item shall be the same
as its determination, recognition and classification for federal income tax
purposes (including, without limitation, any method of depreciation, cost
recovery or amortization used for that purpose), provided, that:

            (i) Solely for purposes of this Section 4.4, the Partnership shall
      be treated as owning directly its proportionate share (as determined by
      the Partnership Policy Committee based upon the provisions of the Northern
      Border Pipeline Partnership Agreement) of all property owned by Northern
      Border Pipeline.

            (ii) All fees and other expenses incurred by the Partnership to
      promote the sale of (or to sell) a Partnership Interest that can neither
      be deducted nor amortized under Section 709 of the Code, if any, shall,
      for purposes of Capital Account maintenance, be treated as an item of
      deduction at the time such fees and other expenses are incurred and shall
      be allocated among the Partners pursuant to Section 5.1.

            (iii) Except as otherwise provided in Treasury Regulation Section
      1.704-1 (b)(2)(iv)(m), the computation of all items of income, gain, loss
      and deduction shall be made without regard to any election under Section
      754 of the Code which may be made by the Partnership and, as to those
      items described in Section 705(a)(1)(B) or 705(a)(2)(B) of the Code,
      without regard to the fact that such items are not includable in gross
      income or are neither currently deductible nor capitalized for federal
      income tax purposes.

            (iv) Any income, gain or loss attributable to the taxable
      disposition of any Partnership property shall be determined as if the
      adjusted basis of such property as of such date of disposition were equal
      in amount to the Partnership's Carrying Value with respect to such
      property as of such date.

            (v) In accordance with the requirements of Section 704(b) of the
      Code, any deductions for depreciation, cost recovery or amortization
      attributable to any Contributed Property shall be determined as if the
      adjusted basis of such property on the date it was acquired by the
      Partnership were equal to the Agreed Value of such property Upon an
      adjustment pursuant to Section 4.4(d) to the Carrying Value of any
      Partnership property subject to depreciation, cost recovery or
      amortization, any further deductions for such depreciation, cost recovery
      or amortization attributable to such property shall be determined (A) as
      if the adjusted basis of such property were equal to the Carrying Value of
      such property immediately following such adjustment and (B) using a rate
      of depreciation, cost

                                       14
<PAGE>

      recovery or amortization derived from the same method and useful life (or,
      if applicable, the remaining useful life) as is applied for federal income
      tax purposes; provided, however, that, if the asset has a zero adjusted
      basis for federal income tax purposes, depreciation, cost recovery or
      amortization deductions shall be determined using any reasonable method
      that the Partnership Policy Committee may adopt.

            (vi) If the Partnership's adjusted basis in a depreciable or cost
      recovery property is reduced for federal income tax purposes pursuant to
      Section 48(q)(1) or 48(q)(3) of the Code, the amount of such reduction
      shall, solely for purposes hereof, be deemed to be an additional
      depreciation or cost recovery deduction in the year such property is
      placed in service and shall be allocated among the Partners pursuant to
      Section 5.1. Any restoration of such basis pursuant to Section 48(q)(2) of
      the Code shall, to the extent possible, be allocated in the same manner to
      the Partners to whom such deemed deduction was allocated.

      (c)   A transferee of a Partnership Interest shall succeed to a pro rata
portion of the Capital Account of the transferor relating to the Partnership
Interest so transferred; provided, however, that, if the transfer causes a
termination of the Partnership under Section 708(b)(1)(B) of the Code, the
Partnership's properties shall be deemed to have been distributed in liquidation
of the Partnership to the Partners (including any transferee of a Partnership
Interest that is a party to the transfer causing such termination) pursuant to
Sections 13.3 and 13.4 and recontributed by such Partners in reconstitution of
the Partnership. Any such deemed distribution shall be treated as an actual
distribution for purposes of this Section 4.4. In such event, the Carrying
Values of the Partnership properties shall be adjusted immediately prior to such
deemed distribution pursuant to Section 4.4(d)(ii) and such Carrying Values
shall then constitute the Agreed Values of such properties upon such deemed
contribution to the reconstituted Partnership. The Capital Accounts of such
reconstituted Partnership shall be maintained in accordance with the principles
of this Section 4.4.

      (d)   (i) Consistent with the provisions of Treasury Regulation Section
      1.704-1 (b)(2)(iv)(f), on an issuance of additional Partnership Interests
      for cash or Contributed Property, the Capital Account of all Partners and
      the Carrying Value of each Partnership property immediately prior to such
      issuance shall be adjusted upward or downward to reflect any Unrealized
      Gain or Unrealized Loss attributable to such Partnership property, as if
      such Unrealized Gain or Unrealized Loss had been recognized on an actual
      sale of each such property immediately prior to such issuance and had been
      allocated to the Partners at such time pursuant to Section 5.1. In
      determining such Unrealized Gain or Unrealized Loss, the aggregate cash
      amount and fair market value of all Partnership assets (including, without
      limitation, cash or cash equivalents) immediately prior to the issuance of
      additional Partnership Interests shall be determined by the Partnership
      Policy Committee using such reasonable method of valuation as it may
      adopt; provided, however, the Partnership Policy Committee, in arriving at
      such valuation, must take fully into account the fair market value of the
      Partnership Interests of all Partners at such time. The Partnership Policy
      Committee shall allocate such aggregate value among the assets of the
      Partnership (in such manner as it determines in its sole discretion to be
      reasonable) to arrive at a fair market value for individual properties.

            (ii) In accordance with Treasury Regulation Section
      1.704-1(b)(2)(iv)(f), immediately prior to any actual or deemed
      distribution to a Partner of any Partnership property (other than a
      distribution of cash that is not in redemption or retirement of a
      Partnership Interest), the Capital Accounts of all Partners and the
      Carrying Value of such Partnership property shall be adjusted upward or
      downward to reflect any Unrealized Gain or Unrealized

                                      15
<PAGE>

      Loss attributable to such Partnership property, as if such Unrealized Gain
      or Unrealized Loss had been recognized in a sale of such property
      immediately prior to such distribution for an amount equal to its fair
      market value, and had been allocated to the Partners, at such time,
      pursuant to Section 5.1. Any Unrealized Gain or Unrealized Loss
      attributable to such property shall be allocated in the same manner as Net
      Termination Gain or Net Termination Loss pursuant to Section 5.1 (c);
      provided, however, that, in making any such allocation, Net Termination
      Gain or Net Termination Loss actually realized shall be allocated first.
      In determining such Unrealized Gain or Unrealized Loss the aggregate cash
      amount and fair market value of all Partnership assets (including, without
      limitation, cash or cash equivalents) immediately prior to a distribution
      shall (A) in the case of a deemed distribution occurring as a result of a
      termination of the Partnership pursuant to Section 708 of the Code, be
      determined and allocated in the same manner as that provided in Section
      4.4(d)(i) or (B) in the case of a liquidating distribution pursuant to
      Section 14.3 or 14.4, be determined and allocated by the Liquidator using
      such reasonable method of valuation as it may adopt.

      4.5 INTEREST. No interest shall be paid by the Partnership on Capital
Contributions or on balances in Partners' Capital Accounts.

      4.6 NO WITHDRAWAL. No Partner shall be entitled to withdraw any part of
his Capital Contributions or its Capital Account or to receive any distribution
from the Partnership, except as provided in Section 4.2, Articles V, VII and
XIII.

      4.7 LOANS FROM PARTNERS. Loans by a Partner to the Partnership shall not
constitute Capital Contributions. If any Partner shall advance funds to the
Partnership in excess of the amounts required hereunder to be contributed by it
to the capital of the Partnership, the making of such excess advances shall not
result in any increase in the amount of the Capital Account of such Partner. The
amount of any such excess advances shall be a debt obligation of the Partnership
to such Partner and shall be payable or collectible only out of the Partnership
assets in accordance with the terms and conditions upon which such advances are
made.

                                    ARTICLE V
                          ALLOCATIONS AND DISTRIBUTIONS

      5.1   ALLOCATIONS FOR CAPITAL ACCOUNT PURPOSES. For purposes of
maintaining the Capital Accounts and in determining the rights of the Partners
among themselves, the Partnership's items of income, gain, loss and deduction
(computed in accordance with Section 4.4(b)) shall be allocated among the
Partners in each taxable year (or portion thereof) as provided hereinbelow.

            (a)   Net Income. After giving effect to the special allocations set
      forth in Section 5.1 (d), Net Income for each taxable period and all items
      of income, gain, loss and deduction taken into account in computing Net
      Income for such taxable period shall be allocated as follows:

                  (i) First, 100% to the General Partners in accordance with
            their relative General Partner Percentage Interests until the
            aggregate Net Income allocated to each General Partner pursuant to
            this Section 5.1 (a)(i) for the current taxable year and all
            previous taxable years is equal to the aggregate Net Losses
            allocated to such General Partner pursuant to Section 5.1(b)(ii) for
            all previous taxable years;

                                      16
<PAGE>

                  (ii) Second, the balance, if any, 100% to the General Partners
            and the Limited Partners in the same proportion as Net Losses were
            allocated pursuant to Section 5.1(b)(i) and thereafter in accordance
            with their respective Percentage Interests.

            (b)   Net Losses. After giving effect to the special allocations set
      forth in Section 5.1(d), Net Losses for each taxable period and all items
      of income, gain, loss and deduction taken into account in computing Net
      Losses for such taxable period shall be allocated as follows:

                  (i) First, 100% to the General Partners and the Limited
            Partners in proportion to, and to the extent of, the positive
            balances in their respective Adjusted Capital Accounts; and

                  (ii) Second, the balance, if any, 100% to the General Partners
            in accordance with their relative General Partner Percentage
            Interests.

            (c)   Net Termination Gains and Losses. After giving effect to the
      special allocations set forth in Section 5.1(d), all items of income gain,
      loss and deduction taken into account in computing Net Termination Gain or
      Net Termination Loss for such taxable period shall be allocated in the
      same manner as such Net Termination Gain or Net Termination Loss is
      allocated hereunder. All allocations under this Section 5.1(c) shall be
      made after Capital Account balances have been adjusted by all other
      allocations provided under this Section 5.1 and after all distributions of
      Available Cash provided under Section 5.3 have been made with respect to
      the taxable period ending on the date of the Partnership's liquidation
      pursuant to Section 13.3.

                  (i)   If a Net Termination Gain is recognized (or deemed
            recognized pursuant to Section 4.4(d)) from Termination Capital
            Transactions, such Net Termination Gain shall be allocated between
            the General Partners and the Limited Partners in the following
            manner (and the Adjusted Capital Accounts of the Partners shall be
            increased by the amount so allocated in each of the following
            subclauses, in the order listed, before an allocation is made
            pursuant to the next succeeding subclause):

                        (A) First, to each Partner having a deficit balance in
                  its Adjusted Capital Account, in the proportion that such
                  deficit balance bears to the total deficit balances in the
                  Adjusted Capital Accounts of all Partners, until each such
                  Partner has been allocated Net Termination Gain equal to any
                  such deficit balance in its Adjusted Capital Account; and

                        (B) Second, 100% to the General Partners and the Limited
                  Partners in accordance with their respective Percentage
                  Interests.

                  (ii)  If a Net Termination Loss is recognized (or deemed
            recognized pursuant to Section 4.4(d)) from Termination Capital
            Transactions, such Net Termination Loss shall be allocated to the
            Partners in the following manner:

                        (A) First, 100% to the General Partners and the Limited
                  Partners in proportion to, and to the extent of, the positive
                  balances in their respective Adjusted Capital Accounts; and

                                       17
<PAGE>

                        (B) Second, the balance, if any, 100% to the General
                  Partners, in accordance with their relative General Partner
                  Percentage Interests.

            (d) Special Allocations. Notwithstanding any other provision of this
      Section 5.1, the following special allocations shall be made for such
      taxable period:

                  (i)   Partnership Minimum Gain Chargeback. Notwithstanding any
            other provision of this Section 5.1, if there is a net decrease in
            Partnership Minimum Gain during any Partnership taxable period, each
            Partner shall be allocated items of Partnership income and gain for
            such period (and, if necessary, subsequent periods) in the manner
            and amounts provided in Treasury Regulation Sections 1.704-2(f)(6),
            1.704-2(g)(2) and 1.704-(j)(2)(i), or any successor provision. For
            purposes of this Section 5.1 (d), each Partner's Adjusted Capital
            Account balance shall be determined, and the allocation of income or
            gain required hereunder shall be effected, prior to the application
            of any other allocations pursuant to this Section 5.1 (d) with
            respect to such taxable period (other than an allocation pursuant to
            Sections 5.1 (d)(v) and 5.1(d)(vi)). This Section 5.1(d)(i) is
            intended to comply with the Partnership Minimum Gain chargeback
            requirement in Treasury Regulation Section 1.704-2(f) and shall be
            interpreted consistently therewith.

                  (ii)  Chargeback of Partner Nonrecourse Debt Minimum Gain.
            Notwithstanding the other provisions of this Section 5.1 (other than
            Section 5.1(d)(i)), except as provided in Treasury Regulation
            Section 1.704-2(i)(4), if there is a net decrease in Partner
            Nonrecourse Debt Minimum Gain during any Partnership taxable period,
            any Partner with a share of Partner Nonrecourse Debt Minimum Gain at
            the beginning of such taxable period shall be allocated items of
            Partnership income and gain for such period (and, if necessary,
            subsequent periods) in the manner and amounts provided in Treasury
            Regulation Sections 1.704-2(i)(4) and 1.704-2(j)(2)(ii), or any
            successor provisions. For purposes of this Section 5.1 (d), each
            Partner's Adjusted Capital Account balance shall be determined, and
            the allocation of income or gain required hereunder shall be
            effected, prior to the application of any other allocations pursuant
            to this Section 5.1 (d), other than Section 5.1(d)(i) and other than
            an allocation pursuant to Sections 5.1 (d)(v) and 5.1(d)(vi), with
            respect to such taxable period. This Section 5.1 (d)(ii) is intended
            to comply with the chargeback of items of income and gain
            requirement in Treasury Regulation Section 1.704-2(i)(4) and shall
            be interpreted consistently therewith.

                  (iii) Qualified Income Offset. In the event any Partner
            unexpectedly receives any adjustments, allocations or distributions
            described in Treasury Regulation Sections 1.704-1 (b)(2)(ii)(d)(4),
            1.704-1(b)(2)(ii)(d)(5), or 1.704-1 (b)(2)(ii)(d)(6), items of
            Partnership income and gain shall be specifically allocated to such
            Partner in an amount and manner sufficient to eliminate, to the
            extent required by the Treasury regulations promulgated under
            Section 704(b) of the Code, the deficit balance, if any, in its
            Adjusted Capital Account created by such adjustments, allocations or
            distributions as quickly as possible unless such deficit balance is
            otherwise eliminated pursuant to Section 5.1(d)(i) or (ii).

                  (iv)  Gross Income Allocations. In the event any Partner has a
            deficit balance in its Adjusted Capital Account at the end of any
            Partnership taxable period, such Partner shall be specially
            allocated items of Partnership gross income and gain in the amount
            of such excess as quickly as possible; provided, that an allocation

                                      18
<PAGE>

            pursuant to this Section 5.1 (d)(iv) shall be made only if and to
            the extent that such Partner would have a deficit balance in its
            Adjusted Capital Account after all other allocations provided for in
            this Section 5.1 have been tentatively made as if this Section
            5.1(d)(iv) were not in this Agreement.

                  (v)   Nonrecourse Deductions. Nonrecourse Deductions for any
            taxable period shall be allocated to the Partners in accordance with
            their respective Percentage Interests. If the Partnership Policy
            Committee determines in its good faith discretion that the
            Partnership's Nonrecourse Deductions must be allocated in a
            different ratio to satisfy the safe harbor requirements of the
            Treasury Regulations promulgated under Section 704(b) of the Code,
            the Partnership Policy Committee is authorized, upon notice to the
            Limited Partners, to revise the prescribed ratio to the numerically
            closest ratio that does satisfy such requirements.

                  (vi)  Partner Nonrecourse Deductions. Partner Nonrecourse
            Deductions for any taxable period shall be allocated 100% to the
            Partner that bears the Economic Risk of Loss with respect to the
            Partner Nonrecourse Debt to which such Partner Nonrecourse
            Deductions are attributable in accordance with Treasury Regulation
            Section 1.704-2(i). If more than one Partner bears the Economic Risk
            of Loss with respect to a Partner Nonrecourse Debt, such Partner
            Nonrecourse Deductions attributable thereto shall be allocated
            between or among such Partners in accordance with the ratios in
            which they share such Economic Risk of Loss.

                  (vii) Nonrecourse Liabilities. For purposes of Treasury
            Regulation Section 1.752-3(a)(3), the Partners agree that
            Nonrecourse Liabilities of the Partnership in excess of the sum of
            (A) the amount of Partnership Minimum Gain and (B) the total amount
            of Nonrecourse Built-in Gain shall be allocated among the Partners
            in accordance with their respective Percentage Interests.

                 (viii) Code Section 754 Adjustments. To the extent an
            adjustment to the adjusted tax basis of any Partnership asset
            pursuant to Section 734(b) or 743(b) of the Code is required,
            pursuant to Treasury Regulation Section 1.704-1(b)(2)(iv)(m), to be
            taken into account in determining Capital Accounts, the amount of
            such adjustment to the Capital Accounts shall be treated as an item
            of gain (if the adjustment increases the basis of the asset) or loss
            (if the adjustment decreases such basis), and such item of gain or
            loss shall be specially allocated to the Partners in a manner
            consistent with the manner in which their Capital Accounts are
            required to be adjusted pursuant to such Section of the Treasury
            regulations.

                  (ix)  Curative Allocation.

                        (A) Notwithstanding any other provision of this Section
                  5.1, other than the Required Allocations, the Required
                  Allocations shall be taken into account in making the Agreed
                  Allocations so that, to the extent possible, the net amount of
                  items of income, gain, loss and deduction allocated to each
                  Partner pursuant to the Required Allocations and the Agreed
                  Allocations, together, shall be equal to the net amount of
                  such items that would have been allocated to each such Partner
                  under the Agreed Allocations had the Required Allocations and
                  the related Curative Allocation not otherwise been provided in
                  this Section 5.1. Notwithstanding the preceding sentence,
                  Required Allocations relating to (1) Nonrecourse Deductions
                  shall not be taken into

                                      19
<PAGE>

                  account except to the extent that there has been a decrease in
                  Partnership Minimum Gain and (2) Partner Nonrecourse
                  Deductions shall not be taken into account except to the
                  extent that there has been a decrease in Partner Nonrecourse
                  Debt Minimum Gain. Allocations pursuant to this Section
                  5.1(d)(ix)(A) shall only be made with respect to Required
                  Allocations to the extent the Partnership Policy Committee
                  reasonably determines that such allocations will otherwise be
                  inconsistent with the economic agreement among the Partners.
                  Further, allocations pursuant to this Section 5.1 (d)(ix)(A)
                  shall be deferred with respect to allocations pursuant to
                  clauses (1) and (2) hereof to the extent the Partnership
                  Policy Committee reasonably determines that such allocations
                  are likely to be offset by subsequent Required Allocations.

                        (B) The Partnership Policy Committee shall have
                  reasonable discretion, with respect to each taxable period, to
                  (1) apply the provisions of Section 5.1 (d)(ix)(A) in whatever
                  order is most likely to minimize the economic distortions that
                  might otherwise result from the Required Allocations, and (2)
                  divide all allocations pursuant to Section 5.1 (d)(ix)(A)
                  among the Partners in a manner that is likely to minimize such
                  economic distortions.

      5.2   ALLOCATIONS FOR TAX PURPOSES. (a) Except as otherwise provided
herein, for federal income tax purposes, each item of income, gain, loss and
deduction shall be allocated among the Partners in the same manner as its
correlative item of "book" income, gain, loss or deduction is allocated pursuant
to Section 5.1.

      (b)   In an attempt to eliminate Book-Tax Disparities attributable to a
Contributed Property or Adjusted Property, items of income, gain, loss,
depreciation, amortization and cost recovery deductions shall be allocated for
federal income tax purposes among the Partners as follows:

            (i)   (A) In the case of a Contributed Property, such items
      attributable thereto shall be allocated among the Partners in the manner
      provided under Section 704(c) of the Code that takes into account the
      variation between the Agreed Value of such property and its adjusted basis
      at the time of contribution; and (B) except as otherwise provided in
      Section 5.2(b)(iv), any item of Residual Gain or Residual Loss
      attributable to a Contributed Property shall be allocated among the
      Partners in the same manner as its correlative item of "book" gain or loss
      is allocated pursuant to Section 5.1.

            (ii)  (A) In the case of an Adjusted Property, such items shall (1)
      first, be allocated among the Partners in a manner consistent with the
      principles of Section 704(c) of the Code to take into account the
      Unrealized Gain or Unrealized Loss attributable to such property and the
      allocations thereof pursuant to Section 4.4(d)(i) or (ii), and (2) second,
      in the event such property was originally a Contributed Property, be
      allocated among the Partners in a manner consistent with Section
      5.2(b)(i)(A); and(B) except as otherwise provided in Section 5.2(b)(iv),
      any item of Residual Gain or Residual Loss attributable to an Adjusted
      Property shall be allocated among the Partners in the same manner as its
      correlative item of "book" gain or loss is allocated pursuant to Section
      5.1.

            (iii) Except as otherwise provided in Section 5.2(b)(iv), all other
      items of income, gain, loss and deduction shall be allocated among the
      Partners in the same manner as their correlative item of "book" gain or
      loss is allocated pursuant to Section 5.1.

                                      20
<PAGE>

            (iv)  Any items of income, gain, loss or deduction otherwise
      allocable under Section 5.2(b)(i)(B), 5.2(b)(ii)(B) or 5.2(b)(iii) shall
      be subject to allocation by the Partnership Policy Committee in a manner
      designed to eliminate, to the maximum extent possible, Book-Tax
      Disparities in a Contributed Property or Adjusted Property otherwise
      resulting from the application of the "ceiling" limitation (under Section
      704(c) of the Code or Section 704(c) principles) to the allocations
      provided under Section 5.2(b)(i)(A) or 5.2(b)(ii)(A).

      (c)   For the proper administration of the Partnership and for the
preservation of uniformity of or any class or classes of Partnership Interests,
the Partnership Policy Committee shall have sole discretion to (i) adopt such
conventions as it deems appropriate in determining the amount of depreciation,
amortization and cost recovery deductions; (ii) make special allocations for
federal income tax purposes of income (including, without limitation, gross
income) or deductions; and (iii) amend the provisions of this Agreement as
appropriate (x) to reflect the proposal or promulgation of Treasury regulations
under Section 704(b) or Section 704(c) of the Code or (y) otherwise to preserve
or achieve uniformity of any class or classes of Partnership Interests. The
Partnership Policy Committee may adopt such conventions, make such allocations
and make such amendments to this Agreement as provided in this Section 5.2(c)
only if such conventions, allocations or amendments would not have a material
adverse effect on the Partners, the holders of any class or classes of
Partnership Interests or the Partnership, and if such allocations are consistent
with the principles of Section 704 of the Code.

      (d)   The Partnership Policy Committee in its sole discretion may
determine to depreciate the portion of an adjustment under Section 743(b) of the
Code attributable to unrealized appreciation in any Adjusted Property (to the
extent of the unamortized Book-Tax Disparity) using a predetermined rate derived
from the depreciation method and useful life applied to the Partnership's common
basis of such property, despite the inconsistency of such approach with Proposed
Treasury Regulation Section 1.168-2(n) and Treasury Regulation Section
1.167(c)-1(a)(6). If the Partnership Policy Committee determines that such
reporting position cannot reasonably be taken, the Partnership Policy Committee
may adopt a depreciation convention under which all purchasers acquiring
Partnership Interests in the same month would receive depreciation, based upon
the same applicable rate as if they had purchased a direct interest in the
Partnership's property. If the Partnership Policy Committee chooses not to
utilize such aggregate method, the Partnership Policy Committee may use any
other reasonable depreciation convention to preserve the uniformity of the
intrinsic tax characteristics of any class or classes of Partnership Interests
that would not have a material adverse effect on the Limited Partners or the
holders of any class or classes of Partnership Interests.

      (e)   Any gain allocated to the Partners upon the sale or other taxable
disposition of any Partnership asset shall, to the extent possible, after taking
into account other required allocations of gain pursuant to this Section 5.2, be
characterized as Recapture Income in the same proportions and to the same extent
as such Partners (or their predecessors in interest) have been allocated any
deductions directly or indirectly giving rise to the treatment of such gains as
Recapture Income.

      (f)   All items of income, gain, loss, deduction and credit recognized by
the Partnership for federal income tax purposes and allocated to the Partners in
accordance with the provisions hereof shall be determined without regard to any
election under Section 754 of the Code which may be made by the Partnership;
provided, however, that such allocations, once made, shall be adjusted as
necessary or appropriate to take into account those adjustments permitted or
required by Sections 734 and 743 of the Code.

      (g)   The Partnership Policy Committee may adopt such methods of
allocation of income, gain, loss or deduction between a transferor and a
transferee of a Partnership Interest as it

                                      21
<PAGE>

determines necessary, to the extent permitted or required by Section 706 of the
Code and the regulations or rulings promulgated thereunder.

      5.3   REQUIREMENT AND CHARACTERIZATION OF DISTRIBUTIONS. (a) Within 45
days following the end of each calendar quarter (or following the period from
the Closing Date to December 31, 1993) an amount equal to 100% of Available Cash
with respect to such quarter (or period) shall be distributed in accordance with
this Article V by the Partnership to the Partners in accordance with their
respective Percentage Interests. The immediately preceding sentence shall not
require any distribution of cash if and to the extent such distribution would be
prohibited by applicable law or by any loan agreement, security agreement,
mortgage, debt instrument or other agreement or obligation to which the
Partnership is a party or by which it is bound or its assets are subject.

      (b)   Notwithstanding the definition of Available Cash contained herein,
disbursements (including, without limitation, contributions to Northern Border
Pipeline or disbursements on behalf of Northern Border Pipeline) made or
reserves established after the end of any quarter shall be deemed to have been
made or established, for purposes of determining Available Cash, within such
quarter if the Partnership Policy Committee so determines. Notwithstanding the
foregoing, in the event of the dissolution and liquidation of the Partnership,
all proceeds of such liquidation shall be applied and distributed in accordance
with, and subject to the terms and conditions of, Sections 13.3 and 13.4.

                                   ARTICLE VI
                      MANAGEMENT AND OPERATION OF BUSINESS

      6.1   PARTNERSHIP POLICY COMMITTEE. (a) Purpose; Size; Chairman. As
provided in Section 6.2 and subject to the terms of Section 6.13, the powers of
the Partnership shall be exercised by or under authority of, and the business
and affairs of the Partnership shall be managed by or under the direction of, a
committee (the "PARTNERSHIP POLICY COMMITTEE") consisting of three persons, one
of whom shall be appointed by each General Partner. Each member of the
Partnership Policy Committee shall serve in such capacity until his successor or
replacement shall have been appointed by the General Partner that originally
appointed such member. The appointment of any such successor or replacement,
which decision may be made in the sole discretion of the appointing General
Partner from time to time, shall become effective upon the delivery by the
appointing General Partner of written notice to each other General Partner. As
of the date hereof, the General Partners have notified each other of their
respective initial appointments to the Partnership Policy Committee. The
Chairman of the Partnership Policy Committee shall be the appointee of Northern
Plains, who shall preside at all meetings of the Partnership Policy Committee.

      (b)   Voting; Quorum; Required Vote for Action. Unless otherwise required
by law or the provisions hereof,

            (i) each member of the Partnership Policy Committee shall have a
      number of votes that corresponds to the General Partner Percentage
      Interest of the General Partner that appointed such member (if the general
      partner interest of a General Partner in the Partnership is purchased by
      another General Partner or General Partners pursuant to the applicable
      provisions of the MLP Agreement, the voting power of the Departing Partner
      shall be reallocated to the purchasing General Partner(s) based on the
      portion of the Departing Partner's General Partner Percentage Interest
      purchased by such General Partner(s));

                                      22
<PAGE>

            (ii)  the presence at a meeting of members of the Partnership Policy
      Committee that in the aggregate represent a majority of the total number
      of votes held by all members of the Partnership Policy Committee shall
      constitute a quorum at any such meeting for the transaction of business;
      and

            (iii) the act of members of the Partnership Policy Committee that in
      the aggregate represent a majority of the total number of votes held by
      all members of the Partnership Policy Committee shall be deemed to
      constitute the act of the Partnership Policy Committee. In the event of a
      50-50 split in voting with respect to any matter before the Partnership
      Policy Committee, any member of the Partnership Policy Committee shall
      have the right, exercisable by delivery of written notice to the other
      members of the Partnership Policy Committee within 30 days after such
      vote, to cause such matter to be submitted to binding arbitration in
      accordance with the following procedures:

                  (A) The members of the Partnership Policy Committee shall,
            within 15 Business Days following the receipt by each non-submitting
            member of the notice referred to above, attempt to agree upon an
            independent expert qualified to decide on the particular matter with
            respect to which a 50-50 split in voting has occurred (the expert so
            selected being herein referred to as the "ARBITRATOR"); provided,
            however, that if such agreement cannot be reached within such
            period, the member(s) of the Partnership Policy Committee voting
            affirmatively on such matter shall select a qualified independent
            expert within 15 days thereafter, the member(s) of the Partnership
            Policy Committee voting against such matter shall select a qualified
            independent expert within 15 days thereafter, and the two experts so
            selected shall, within ten days following the selection of the
            latter of the two, select a third qualified independent expert, and
            the three experts so selected shall constitute the Arbitrator;

                  (B) The Arbitrator shall promptly gather all materials,
            information, testimony and evidence it deems relevant to the
            particular matter before it (and each member of the Partnership
            Policy Committee and the General Partner appointing such member
            agrees to provide any such materials, information, testimony and
            evidence requested by the Arbitrator, except to the extent any
            information so requested is proprietary, subject to a third party
            confidentiality agreement or subject to an attorney- client or other
            privilege);

                  (C) The sole consideration of the Arbitrator in determining
            its decision with respect to any matter submitted to it shall be the
            best interests of the Partnership;

                  (D) All decisions of the Arbitrator, including the final
            decision of the Arbitrator with respect to any matters submitted to
            it, shall be final and binding on the General Partners and their
            appointed members of the Partnership Policy Committee; if the
            Arbitrator consists of three experts as contemplated by clause (A)
            above, all decisions of such experts, including the final decision
            of such experts as the Arbitrator, shall be made by approval of a
            majority of such experts;

                  (E) The Arbitrator shall use all reasonable efforts to render
            its decision with respect to any matter submitted to it as soon as
            practicable, but in any event on or before the 30th Business Day
            following the date on which the identity of the Arbitrator is
            finally determined pursuant to clause (A) above;

                                      23
<PAGE>

                  (F) The costs and expenses of any such arbitration shall be
            borne by the Partnership; and

                  (G) To the extent not inconsistent with the terms of this
            Agreement, any such arbitration shall be conducted in Houston, Texas
            in accordance with the then current rules of the American
            Arbitration Association.

      (c) Meetings. Regular meetings of the Partnership Policy Committee shall
be held at least once each calendar quarter on such date(s) and at such time(s)
as may be determined by the Chair man of the Partnership Policy Committee.
Written notice stating the place, day and hour of each regular meeting of the
Partnership Policy Committee shall be delivered by the Chairman to every other
member not less than 10 nor more than 60 days prior to the date of the meeting.
Special meetings of the Partnership Policy Committee may be called by written
request of any member of the Partnership Policy Committee. on at least 48 hours
prior written notice to the other members (which notice may be personally
delivered or sent by telecopy, with confirmation of receipt by return telecopy).
Any such notice, or waiver thereof, need not state the purpose of such meeting.
Attendance of a member at a meeting shall constitute a waiver of notice of such
meeting, unless such member attends for the express purpose of objecting, at the
beginning of the meeting, to the transaction of any business because the meeting
was not properly called or convened. Unless otherwise agreed upon by all
members, all meetings of the Partnership Policy Committee shall be held at the
principal office of the Partnership.

      (d) Action Without a Meeting; Telephone Conference Meeting. Any action
required or permitted to be taken at any meeting of the Partnership Policy
Committee may be taken without a meeting, and without prior notice, if a consent
or consents in writing, setting forth the action so taken, shall be signed by
all members of the Partnership Policy Committee. Any such consent shall be filed
with the minutes of proceedings of the Partnership Policy Committee and shall
have the same force and effect as a unanimous vote at a meeting. Subject to the
requirement for notice of such meetings, members of the Partnership Policy
Committee may participate in a meeting of the Partnership Policy Committee by
means of a conference telephone or similar communications equipment, by means of
which all persons participating in the meeting can hear each other, and
participation in such meetings shall constitute presence in person at the
meeting, except where a person participates in the meeting for the express
purpose of objecting to the transaction of any business on the ground that the
meeting is not properly called or convened.

      (e) Designation; Powers. The Partnership Policy Committee may delegate to
one or more Persons, or designate one or more committees, that shall have and
may exercise such of the powers and authority of the Partnership Policy
Committee with respect to the management of the business and affairs of the
Partnership as may be provided in a written resolution of the Partnership Policy
Committee. Pursuant to such authority and as set forth in the Administrative
Services Agreement, the Partnership Policy Committee has delegated the
performance of certain administrative services in connection with the day-to-day
business and affairs of the Partnership to NBP Services Corporation, a Delaware
corporation.

      (f) Substitution of Members. Each member of the Partnership Policy
Committee may designate one or more persons to act as alternate members of the
Partnership Policy Committee, who may replace such member at any meeting of the
Partnership Policy Committee.

      6.2 MANAGEMENT. (a) Except as otherwise expressly provided in this
Agreement, all management powers over the business and affairs of the
Partnership shall be exclusively vested in the Partnership Policy Committee, and
no General Partner or Limited Partner shall have any

                                      24
<PAGE>

management power over the business and affairs of the Partnership. In addition
to the powers now or hereafter granted a general partner of a limited
partnership under applicable law or which are granted to the Partnership Policy
Committee under any other provision of this Agreement, the Partnership Policy
Committee, subject to Section 6.4, shall have full power and authority to do all
things and on such terms as it, in its sole discretion, may deem necessary or
appropriate to conduct the business of the Partnership, to exercise all powers
set forth in Section 3.2 and to effectuate the purposes set forth in Section
3.1, including, without limitation, (i) the making of any expenditures, the
lending or borrowing of money, the assumption or guarantee of, or other
contracting for, indebtedness and other liabilities, the issuance of evidences
of indebtedness and the incurring of any other obligations; (ii) the making of
tax, regulatory and other filings, or rendering of periodic or other reports to
governmental or other agencies having jurisdiction over the business or assets
of the Partnership; (iii) the acquisition, disposition, mortgage, pledge,
encumbrance, hypothecation or exchange of any or all of the assets of the
Partnership or the merger or other combination of the Partnership with or into
another Person (the matters described in this clause (iii) being subject,
however, to any prior approval that may be required by Section 6.4); (iv) the
use of the assets of the Partnership (including, without limitation, cash on
hand) for any purpose consistent with the terms of this Agreement, including,
without limitation, the financing of the conduct of the operations of the
Partnership or Northern Border Pipeline, the lending of funds to other Persons
(including, without limitation, Northern Border Pipeline), the repayment of
obligations of the Partnership or Northern Border Pipeline and the making of
capital contributions to Northern Border Pipeline; (v) the negotiation,
execution and performance of any contracts, conveyances or other instruments
(including, without limitation, instruments that limit the liability of the
Partnership under contractual arrangements to all or particular assets of the
Partnership, with the other party to the contract to have no recourse against
the General Partners or their assets other than its interest in the Partnership,
even if same results in the terms of the transaction being less favorable to the
Partnership than would otherwise be the case); (vi) the distribution of
Partnership cash; (vii) the selection and dismissal of officers, employees and
agents (including, without limitation, officers having titles such as
"president," "chief executive officer," "vice president," "chief financial and
accounting officer," "secretary" and "treasurer"), outside attorneys,
accountants, consultants and contractors and the determination of their
compensation and other terms of employment or hiring; (viii) the maintenance of
such insurance for the benefit of the Partnership and the Partners as it deems
necessary or appropriate; (ix) the formation of, or acquisition of an interest
in, and the contribution of property to, any further limited or general
partnerships, joint ventures, corporations, limited liability companies or other
relationships (including, without limitation, the acquisition of interests in,
and the contributions of property to, Northern Border Pipeline from time to
time); (x) the control of any matters affecting the rights and obligations of
the Partnership, including, without limitation, the bringing and defending of
actions at law or in equity and otherwise engaging in the conduct of litigation
and the incurring of legal expense and the settlement of claims and litigation;
(xi) the indemnification of any Person against liabilities and contingencies to
the extent permitted by law; and (xii) the undertaking of any action in
connection with the Partnership's participation in Northern Border Pipeline as a
general partner (including, without limitation, contributions or loans of funds
by the Partnership to Northern Border Pipeline).

      (b)   Notwithstanding any other provision of this Agreement, the Delaware
Act or any applicable law, rule or regulation, each of the Partners and each
other Person who may acquire Partnership Interests hereby (i) approves, ratifies
and confirms the execution, delivery and performance by the parties thereto of
this Agreement, the Underwriting Agreement, the Conveyance Agreement, the Credit
Agreement and the Administrative Services Agreement, and the engaging by any
Affiliate of a General Partner in the transportation of natural gas and related
activities, including, without limitation, the expansion of existing facilities
owned or operated by such Affiliate, the acquisition of additional facilities or
the construction of new facilities, even if such activities are in direct
competition with the business and activities of the Partnership, the MLP or
Northern Border

                                      25
<PAGE>

Pipeline; (ii) agrees that the Partnership Policy Committee (on its own or
through any officer selected as the chief executive officer, chief financial and
accounting officer, president or any vice-president of the Partnership pursuant
to Section 6.2(a)(vii)) is authorized to execute, deliver and perform the
agreements referred to in clause (i) of this sentence and the other agreements,
acts, transactions and matters described in the Registration Statement on behalf
of the Partnership without any further act, approval or vote of the Partners or
the other Persons who may acquire Partnership Interests; (iii) agrees that the
execution, delivery or performance by the General Partners, the Partnership
Policy Committee, the Partnership, or any Affiliate of any of them of this
Agreement or any agreement authorized or permitted under this Agreement, or the
engaging by any Affiliate of a General Partner in any of the activities
specified in clause (i) above, even if such activities are in direct competition
with the business and activities of the Partnership, the MLP or Northern Border
Pipeline, shall not constitute a breach by the General Partners, the members of
the Partnership Policy Committee, any officers of the Partnership or any such
Affiliate of any duty that such Persons may owe the Partnership, the General
Partners, the Limited Partners or any other Persons under this Agreement (or any
other agreements) or of any duty stated or implied by law or equity; and (iv)
agrees that each General Partner and its designated representative on the NBPL
Management Committee shall not be in breach of any standard of care or duty
imposed by this Agreement or under the Delaware Act or any applicable law, rule
or regulation with respect to the voting of the Partnership's interest on the
NBPL Management Committee if such designated representative acted in good faith
and in a manner reasonably believed by such person to be in, or not inconsistent
with, the best interests of the Partnership and the MLP.

      6.3 CERTIFICATE OF LIMITED PARTNERSHIP. The General Partners have caused
the Certificate of Limited Partnership to be filed with the Secretary of State
of the State of Delaware as required by the Delaware Act, and the Partnership
Policy Committee shall use all reasonable efforts to cause to be filed such
other certificates or documents as may be determined by the Partnership Policy
Committee in its sole discretion to be reasonable and necessary or appropriate
for the formation, continuation, qualification and operation of a limited
partnership (or a partnership in which the limited partners have limited
liability) in the State of Delaware or any other state in which the Partnership
may elect to do business or own property. To the extent that such action is
determined by the Partnership Policy Committee in its sole discretion to be
reasonable and necessary or appropriate, the Partnership Policy Committee shall
file amendments to and restatements of the Certificate of Limited Partnership
and do all things to maintain the Partnership as a limited partnership (or a
partnership in which the limited partners have limited liability) under the laws
of the State of Delaware or of any other state in which the Partnership may
elect to do business or own property. Subject to the terms of Section 7.4(a),
the Partnership Policy Committee shall not be required, before or after filing,
to deliver or mail a copy of the Certificate of Limited Partnership, any
qualification document or any amendment thereto to any Limited Partner.

      6.4 RESTRICTIONS ON THE PARTNERSHIP POLICY COMMITTEE'S AUTHORITY. (a) The
Partnership Policy Committee may not, without written approval of the specific
act by all of the Limited Partners or by other written instrument executed and
delivered by all of the Limited Partners subsequent to the date of this
Agreement, take any action in contravention of this Agreement, including,
without limitation, (i) any act that would make it impossible to carry on the
ordinary business of the Partnership, except as otherwise provided in this
Agreement; (ii) possess Partnership property, or assign any rights in specific
Partnership property, for other than a Partnership purpose; (iii) admit a Person
as a Partner, except as otherwise provided in this Agreement; or (iv) amend this
Agreement in any manner, except as otherwise provided in this Agreement.

      (b) Except as provided in Articles XIII and XV, the Partnership Policy
Committee may not, without the prior approval of the Limited Partners, sell,
exchange or otherwise dispose of all or

                                      26
<PAGE>

substantially all of the Partnership's assets in a single transaction or a
series of related transactions; provided, however, that this provision shall not
preclude or limit the Partnership Policy Committee's ability to mortgage,
pledge, hypothecate or grant a security interest in all or substantially all of
the Partnership's assets and shall not apply to any forced sale of any or all of
the Partnership's assets pursuant to the foreclosure of, or other realization
upon, any such encumbrance.

      (c) Unless approved by the Limited Partners, the Partnership Policy
Committee shall not take any action or refuse to take any reasonable action the
effect of which, if taken or not taken, as the case may be, would be to cause
the Partnership or Northern Border Pipeline to be treated as an association
taxable as a corporation or otherwise to be taxed as an entity for federal
income tax purposes; provided that this Section 6.4(c) shall not be construed to
apply to amendments to this Agreement (which are governed by Article XIV) or
mergers or consolidations of the Partnership with any Person (which are governed
by Article XV) or of Northern Border Pipeline with any Person (which are
governed by the provisions of the Northern Border Pipeline Company Partnership
Agreement).

      (d) Each General Partner agrees that, at all times while serving as a
general partner of the Partnership, it will not make any dividend or
distribution on, or repurchase any shares of, its stock or take any other action
within its control if the effect of such dividend, distribution, repurchase or
other action would be to reduce its net worth below an amount necessary to
receive an Opinion of Counsel that the Partnership will be treated as a
partnership for federal income tax purposes.

      6.5 REIMBURSEMENT OF THE GENERAL PARTNERS, THE MEMBERS OF THE PARTNERSHIP
POLICY COMMITTEE AND THE PARTNERSHIP'S REPRESENTATIVES ON THE NBPL MANAGEMENT
COMMITTEE. (a) Except as provided in this Section 6.5 and elsewhere in this
Agreement, neither the General Partners, the members of the Partnership Policy
Committee, nor the Partnership's representatives on the NBPL Management
Committee shall be compensated for their services as general partners of the
Partnership, members of the Partnership Policy Committee or representatives of
the Partnership on the NBPL Management Committee, respectively.

      (b) Each of the General Partners, the members of the Partnership Policy
Committee and representatives of the Partnership on the NBPL Management
Committee shall be reimbursed on a monthly basis, or such other basis as the
Partnership Policy Committee may determine in its reasonable discretion, for (i)
all direct and indirect expenses such Person incurs or payments it makes on
behalf of the Partnership (including, without limitation, amounts paid to any
Person to perform services for the Partnership or for the General Partners or
the Partnership Policy Committee in the discharge of their duties to the
Partnership), and (ii) all other necessary or appropriate expenses allocable to
the Partnership or otherwise reasonably incurred by such Person in connection
with operating the Partnership's business (including, without limitation,
expenses allocated to such Person by its Affiliates); provided, however, that
(A) NBP Services Corporation and its Affiliates, including Northern Plains,
shall not be reimbursed hereunder for any amounts that are duplicative of
amounts paid by the Partnership or the MLP to NBP Services Corporation pursuant
to the Administrative Services Agreement, (B) Northern Plains shall not be
reimbursed for any amounts that are duplicative of amounts paid to it by
Northern Border Pipeline pursuant to that certain Operating Agreement dated
February 28, 1980, as amended, by and between Northern Plains and Northern
Border Pipeline and (C) nothing herein shall be construed to grant to any of the
General Partners the power or authority to operate the Partnership's business
(it being understood that the business and affairs of the Partnership shall be
managed by or under the direction of the Partnership Policy Committee). The
Partnership Policy Committee shall determine the fees and expenses that are
allocable to the Partnership in any reasonable manner determined by the
Partnership Policy Committee in its sole discretion. Reimbursements pursuant to
this Section 6.5 shall be in addition to any reimbursement to such Persons as a
result of indemnification pursuant to Section 6.8.

                                      27
<PAGE>

      6.6 OUTSIDE ACTIVITIES. (a) After the Closing Date, each General Partner,
for so long as it is a general partner of the Partnership, (i) agrees that its
sole business will be to act as a general partner of the Partnership and the MLP
and to undertake activities that are ancillary or related thereto (including
being a limited partner in the MLP) and to take such other action and conduct
such other activities permitted to be taken or conducted by a general partner of
Northern Border Pipeline pursuant to the terms of the Northern Border Pipeline
Partnership Agreement (including, in the case of Northern Plains, acting as
operator of Northern Border Pipeline's pipeline system), and (ii) shall not
enter into or conduct any business or incur any debts or liabilities except (A)
in connection with or incidental to (Y) its performance of the activities
required or authorized by the MLP Agreement or this Agreement or described in or
contemplated by the Registration Statement and (Z) the acquisition, ownership or
disposition of partnership interests in the Partnership and the MLP (except
that, notwithstanding the foregoing, employees of each General Partner may
perform services for Affiliates of such General Partner) and (B) any business,
debts or liabilities permitted of a general partner of Northern Border Pipeline
pursuant to the terms of the Northern Border Pipeline Partnership Agreement.

      (b) Except as described or provided for in the MLP Agreement, the
Registration Statement or Section 6.6(a), no Indemnitee shall be expressly or
implicitly restricted or proscribed pursuant to this Agreement, the MLP
Agreement, the Northern Border Pipeline Partnership Agreement or the partnership
relationship established hereby or thereby from engaging in other activities for
profit, whether in the businesses engaged in by the Partnership, the MLP or
Northern Border Pipeline or anticipated to be engaged in by the Partnership, the
MLP, Northern Border Pipeline or otherwise, including, without limitation, in
the case of any Affiliates of the General Partners, those businesses and
activities described in or contemplated by Section 6.2(b)(i) and by the
Registration Statement. Without limitation of and subject to the foregoing, each
Indemnitee (other than a General Partner) shall have the right to engage in
businesses of every type and description and to engage in and possess an
interest in other business ventures of any and every type or description,
independently or with others, including, without limitation, in the case of any
Affiliates of the General Partners, business interests and activities of the
type described in Section 6.2(b)(i), and none of the same shall constitute a
breach of this Agreement, the MLP Agreement or any duty to the Partnership, the
MLP or any Partners. Neither the Partnership, the MLP, any Limited Partner nor
any other Person shall have any rights by virtue of this Agreement, the MLP
Agreement, the Northern Border Pipeline Partnership Agreement or the partnership
relationship established hereby or thereby in any business ventures of any
Indemnitee (subject, in the case of a General Partner, to compliance with
Section 6.6(a)), and such Indemnitees shall have no obligation to offer any
interest in any such business ventures to the Partnership, the MLP, Northern
Border Pipeline, any Limited Partner or any other Person.

      (c) Without limitation of Sections 6.6(a) and 6.6(b), and notwithstanding
anything to the contrary in this Agreement, the competitive activities of any
Indemnitees are hereby approved by all Partners, and it shall not be deemed to
be a breach of the fiduciary duties of the General Partners and the members of
the Partnership Policy Committee for such Persons to permit an Indemnitee to
engage in a business opportunity in preference to or to the exclusion of the
Partnership, if such activities are permitted by this Agreement or the MLP
Agreement.

      6.7 LOANS TO AND FROM THE GENERAL PARTNERS; CONTRACTS WITH AFFILIATES. (a)
(i) Each General Partner or any Affiliate thereof may lend to the Partnership,
and the Partnership may borrow, funds needed or desired by the Partnership for
such periods of time as the Partnership Policy Committee may determine and (ii)
each General Partner or any Affiliate thereof may borrow from the Partnership,
and the Partnership may lend to such General Partner or such Affiliate, excess
funds of the Partnership for such periods of time and in such amounts as the
Partnership Policy Committee

                                      28
<PAGE>

may determine; provided, however, that (A) in either such case the lending party
may not charge the borrowing party interest at a rate greater than the rate that
would be charged the borrowing party (without reference to the lending party's
financial abilities or guarantees) by unrelated lenders on comparable loans and
(B) the requirements of this Section 6.7 shall be deemed to be satisfied as to
the Credit Agreement. The borrowing party shall reimburse the lending party for
any costs (other than any additional interest costs) incurred by the lending
party in connection with the borrowing of such funds. For purposes of this
Section 6.7(a) and Section 6.7(b), the term "Partnership" shall include any
Affiliate of the Partnership that is controlled by the Partnership.

      (b) The Partnership may lend or contribute to the MLP, and the MLP may
borrow, funds on terms and conditions established in the sole discretion of the
Partnership Policy Committee; provided, however, that the Partnership may not
charge the MLP interest at a rate greater than the rate that would be charged to
the MLP (without reference to the financial abilities or guarantees of the
General Partners), by unrelated lenders on comparable loans. The foregoing
authority shall be exercised by the Partnership Policy Committee in its sole
discretion and shall not create any right or benefit in favor of the MLP or any
other Person.

      (c) The Partnership Policy Committee may permit the Partnership to enter
into one or more agreements, in addition to the Administrative Services
Agreement, with one or more of the General Partners and their Affiliates to
render services to the Partnership or to the Partnership Policy Committee in the
discharge of its duties to the Partnership. Any services rendered to the
Partnership by a General Partner or any of its Affiliates shall be on terms that
are fair and reasonable to the Partnership; provided, however, that the
requirements of this Section 6.7(c) shall be deemed satisfied as to (i) any
transaction approved by Special Approval, (ii) any transaction, the terms of
which are no less favorable to the Partnership than those generally being
provided to or available from unrelated third parties or (iii) any transaction
that, taking into account the totality of the relationships between the parties
involved (including other transactions that may be particularly favorable or
advantageous to the Partnership), is equitable to the Partnership. The
provisions of Section 6.5 shall apply to the rendering of services described in
this Section 6.7(c).

      (d) The Partnership Policy Committee may cause the Partnership to transfer
assets to joint ventures, other partnerships, corporations, limited liability
companies or other business entities in which it is or thereby becomes a
participant upon such terms and subject to such conditions as are consistent
with this Agreement and applicable law.

      (e) Neither the General Partners nor any of their Affiliates shall sell,
transfer or convey any property to, or purchase any property from, the
Partnership, directly or indirectly, except pursuant to transactions that are
fair and reasonable to the Partnership; provided, however, that the requirements
of this Section 6.7(e) shall be deemed to be satisfied as to (i) the
transactions effected pursuant to Section 4.1, the Conveyance Agreement and any
other transactions described in or contemplated by the Registration Statement,
(ii) any transaction approved by Special Approval, (iii) any transaction, the
terms of which are no less favorable to the Partnership than those generally
being provided to or available from unrelated third parties, or (iv) any
transaction that, taking into account the totality of the relationships between
the parties involved (including other transactions that may be particularly
favorable or advantageous to the Partnership), is equitable to the Partnership.

      (f) The General Partners and their Affiliates will have no obligation to
permit the Partnership, the MLP or Northern Border Pipeline to use any
facilities or assets of the General Partners and their Affiliates, except as may
be provided in contracts entered into from time to time specifically dealing
with such use, nor shall there be any obligation on the part of the General
Partners or their Affiliates to enter into such contracts.

                                      29
<PAGE>

      (g) Without limitation of Sections 6.7(a) through 6.7(f), and
notwithstanding anything to the contrary in this Agreement, the existence of the
conflicts of interest described in the Registration Statement are hereby
approved by all Partners.

      6.8 INDEMNIFICATION. (a) To the fullest extent permitted by law but
subject to the limitations expressly provided in this Agreement, each General
Partner, the members of the Partnership Policy Committee, the representatives of
the Partnership on the NBPL Management Committee, any Departing Partner, any
Person who is or was an officer or director of the Partnership, a General
Partner or any Departing Partner and all other Indemnitees shall be indemnified
and held harmless by the Partnership from and against any and all losses,
claims, damages, liabilities, joint or several, expenses (including, without
limitation, legal fees and expenses), judgments, fines, penalties, interest,
settlements and other amounts arising from any and all claims, demands, actions,
suits or proceedings, whether civil, criminal, administrative or investigative,
in which any Indemnitee may be involved, or is threatened to be involved, as a
party or otherwise, by reason of its status as (i) a General Partner, a member
of the Partnership Policy Committee, a representative of the Partnership on the
NBPL Management Committee, a Departing Partner or any of their Affiliates, (ii)
an officer, director, employee, partner, agent or trustee of the Partnership, a
General Partner, any Departing Partner or any of their Affiliates or (iii) a
Person serving at the request of the Partnership in another entity in a similar
capacity, provided, that in each case the Indemnitee acted in good faith and in
a manner which such Indemnitee believed to be in, or not opposed to, the best
interests of the Partnership and, with respect to any criminal proceeding, had
no reasonable cause to believe its conduct was unlawful; provided, further, no
indemnification pursuant to this Section 6.8 shall be available to the General
Partners with respect to their obligations incurred pursuant to the Indemnity
Agreement, the Underwriting Agreement or the Conveyance Agreement (other than
obligations incurred by the General Partners on behalf of the Partnership or the
MLP). The termination of any action, suit or proceeding by judgment, order,
settlement, conviction or upon a plea of nolo contendere, or its equivalent,
shall not create a presumption that the Indemnitee acted in a manner contrary to
that specified above. Any indemnification pursuant to this Section 6.8 shall be
made only out of the assets of the Partnership, it being agreed that the General
Partners shall not be personally liable for such indemnification and shall have
no obligation to contribute or loan any monies or property to the Partnership to
enable it to effectuate such indemnification.

      (b) To the fullest extent permitted by law, expenses (including, without
limitation, legal fees and expenses) incurred by an Indemnitee who is
indemnified pursuant to Section 6.8(a) in defending any claim, demand, action,
suit or proceeding shall, from time to time, be advanced by the Partnership
prior to the final disposition of such claim, demand, action, suit or proceeding
upon receipt by the Partnership of an undertaking by or on behalf of the
Indemnitee to repay such amount if it shall be determined that the Indemnitee is
not entitled to be indemnified as authorized in this Section 6.8.

      (c) The indemnification provided by this Section 6.8 shall be in addition
to any other rights to which an Indemnitee may be entitled under any agreement,
pursuant to any vote of the Partners, as a matter of law or otherwise, both as
to actions in the Indemnitee's capacity as (i) a General Partner, a member of
the Partnership Policy Committee, a representative of the Partnership on the
NBPL Management Committee, a Departing Partner or an Affiliate thereof, (ii) an
officer, director, employee, partner, agent or trustee of the Partnership, a
General Partner, any Departing Partner or an Affiliate thereof or (iii) a Person
serving at the request of the Partnership in another entity in a similar
capacity, and as to actions in any other capacity (including, without
limitation, any capacity under the Underwriting Agreement), and shall continue
as to an Indemnitee who has ceased to serve in such capacity and shall inure to
the benefit of the heirs, successors, assigns and administrators of the
Indemnitee.

                                      30
<PAGE>

      (d) The Partnership may purchase and maintain (or reimburse the General
Partners or their Affiliates for the cost of) insurance, on behalf of the
General Partners, the members of the Partnership Policy Committee, the
representatives of the Partnership on the NBPL Management Committee and such
other Persons as the Partnership Policy Committee shall determine, against any
liability that may be asserted against or expense that may be incurred by such
Person in connection with the Partnership's activities, regardless of whether
the Partnership would have the power to indemnify such Person against such
liability under the provisions of this Agreement.

      (e) For purposes of this Section 6.8, the Partnership shall be deemed to
have requested an Indemnitee to serve as fiduciary of an employee benefit plan
whenever the performance by it of its duties to the Partnership also imposes
duties on, or otherwise involves services by, it to the plan or participants or
beneficiaries of the plan; excise taxes assessed on an Indemnitee with respect
to an employee benefit plan pursuant to applicable law shall constitute "fines"
within the meaning of Section 6.8(a); and action taken or omitted by it with
respect to an employee benefit plan in the performance of its duties for a
purpose reasonably believed by it to be in the interest of the participants and
beneficiaries of the plan shall be deemed to be for a purpose which is in, or
not opposed to, the best interests of the Partnership.

      (f) In no event may an Indemnitee subject the Limited Partners to personal
liability by reason of the indemnification provisions set forth in this
Agreement.

      (g) An Indemnitee shall not be denied indemnification in whole or in part
under this Section 6.8 because the Indemnitee had an interest in the transaction
with respect to which the indemnification applies if the transaction was
otherwise permitted by the terms of this Agreement.

      (h) The provisions of this Section 6.8 are for the benefit of the
Indemnities, their heirs, successors, assigns and administrators and shall not
be deemed to create any rights for the benefit of any other Persons.

      (i) No amendment, modification or repeal of this Section 6.8 or any
provision hereof shall in any manner terminate, reduce or impair the right of
any past, present or future Indemnitee to be indemnified by the Partnership, nor
the obligation of the Partnership to indemnify any such Indemnitee under and in
accordance with the provisions of this Section 6.8 as in effect immediately
prior to such amendment, modification or repeal with respect to claims arising
from or relating to matters occurring, in whole or in part, prior to such
amendment, modification or repeal, regardless of when such claims may arise or
be asserted.

      6.9 LIABILITY OF INDEMNITEES. (a) Notwithstanding anything to the contrary
set forth in this Agreement, no Indemnitee shall be liable for monetary damages
to the Partnership, the Limited Partners or any other Persons who have acquired
interests in the Partnership, for losses sustained or liabilities incurred as a
result of any act or omission if such Indemnitee acted in good faith.

      (b) Subject to its obligations and duties as set forth in Section 6.2, the
Partnership Policy Committee may exercise any of the powers granted to it by
this Agreement and perform any of the duties imposed upon it hereunder either
directly or by or through its agents, and the General Partners and the
Partnership Policy Committee shall not be responsible for any misconduct or
negligence on the part of any such agent appointed by the Partnership Policy
Committee in good faith.

      (c) Any amendment, modification or repeal of this Section 6.9 or any
provision hereof shall be prospective only and shall not in any way affect the
limitations on the liability to the Partnership and the Limited Partners of the
members of the Partnership Policy Committee, the

                                      31
<PAGE>

Partnership's representatives on the NBPL Management Committee and the General
Partners and their directors, officers and employees under this Section 6.9 as
in effect immediately prior to such amendment, modification or repeal with
respect to claims arising from or relating to matters occurring, in whole or in
part, prior to such amendment, modification or repeal, regardless of when such
claims may arise or be asserted.

      6.10 RESOLUTION OF CONFLICTS OF INTEREST. (a) Unless otherwise expressly
provided in this Agreement or the MLP Agreement, whenever a potential conflict
of interest exists or arises between a General Partner or any of its Affiliates
or the member of the Partnership Policy Committee or representative of the
Partnership on the NBPL Management Committee designated by it, on the one hand,
and the Partnership, the MLP or any Partner, on the other hand, any resolution
or course of action in respect of such conflict of interest shall be permitted
and deemed approved by all Partners, and shall not constitute a breach of this
Agreement, of the MLP Agreement, of any agreement contemplated herein or
therein, or of any duty stated or implied by law or equity, if the resolution or
course of action is or, by operation of this Agreement is deemed to be, fair and
reasonable to the Partnership. Each General Partner, Partnership Policy
Committee member or representative of the Partnership on the NBPL Management
Committee shall be authorized but not required in connection with its resolution
of such conflict of interest to seek Special Approval of a resolution of such
conflict or course of action. Any conflict of interest and any resolution of
such conflict of interest shall be conclusively deemed fair and reasonable to
the Partnership if such conflict of interest or resolution is (i) approved by
Special Approval, (ii) on terms no less favorable to the Partnership than those
generally being provided to or available from unrelated third parties or (iii)
fair to the Partnership, taking into account the totality of the relationships
between the parties involved (including other transactions that may be
particularly favorable or advantageous to the Partnership). A General Partner,
Partnership Policy Committee member or representative of the Partnership on the
NBPL Management Committee may also adopt a resolution or course of action that
has not received Special Approval. Each General Partner, Partnership Policy
Committee member or representative of the Partnership on the NBPL Management
Committee (and the Audit Committee in connection with Special Approval) shall be
authorized in connection with its determination of what is "fair and reasonable"
to the Partnership and in connection with its resolution of any conflict of
interest to consider (A) the relative interests of any party to such conflict,
agreement, transaction or situation and the benefits and burdens relating to
such interest; (B) any customary or accepted industry practices and any
customary or historical dealings with a particular Person; (C) any applicable
generally accepted accounting or engineering practices or principles; and (D)
such additional factors as such General Partner, Partnership Policy Committee
member or representative of the Partnership on the NBPL Management Committee
(and, if applicable, the Audit Committee) determines in its sole discretion to
be relevant, reasonable or appropriate under the circumstances. Nothing
contained in this Agreement, however, is intended to nor shall it be construed
to require a General Partner, Partnership Policy Committee member or
representative of the Partnership on the NBPL Management Committee (or the Audit
Committee) to consider the interests of any Person other than the Partnership.
In the absence of bad faith by a General Partner, Partnership Policy Committee
member or representative of the Partnership on the NBPL Management Committee,
the resolution, action or terms so made, taken or provided by such General
Partner, Partnership Policy Committee member or representative of the
Partnership on the NBPL Management Committee with respect to such matter shall
not constitute a breach of this Agreement or any other agreement contemplated
herein or a breach of any standard of care or duty imposed herein or therein or
under the Delaware Act or any other law, rule or regulation.

      (b) Whenever this Agreement or any other agreement contemplated hereby
provides that the Partnership Policy Committee, or a General Partner or any of
its Affiliates, is permitted or required to make a decision (i) in its "sole
discretion" or "discretion," that it deems "necessary or

                                      32
<PAGE>
appropriate" or under a grant of similar authority or latitude, the Partnership
Policy Committee, such General Partner or such Affiliate shall be entitled to
consider only such interests and factors as it desires and shall have no duty or
obligation to give any consideration to any interest of, or factors affecting,
the Partnership, the MLP or any Limited Partner, (ii) it may make such decision
in its sole discretion (regardless of whether there is a reference to "sole
discretion" or "discretion") unless another express standard is provided for, or
(iii) in "good faith" or under another express standard, the Partnership Policy
Committee, such General Partner or such Affiliate shall act under such express
standard and shall not be subject to any other or different standards imposed by
this Agreement, the MLP Agreement, any other agreement contemplated hereby or
under the Delaware Act or any other law, rule or regulation. In addition, any
actions taken by the Partnership Policy Committee, a General Partner or such
Affiliate consistent with the standards of "reasonable discretion" set forth in
the definition of Available Cash shall not constitute a breach of any duty of
the members of the Partnership Policy Committee or a General Partner to the
Partnership or the Limited Partners. The Partnership Policy Committee and the
General Partners shall have no duty, express or implied, to sell or otherwise
dispose of any asset of the Partnership, other than in the ordinary course of
business. No borrowing by the Partnership or the MLP or the approval thereof by
the Partnership Policy Committee shall be deemed to constitute a breach of any
duty of the Partnership Policy Committee or a General Partner to the Partnership
or the Limited Partners by reason of the fact that the purpose or effect of such
borrowing is directly or indirectly to (A) enable a General Partner of the MLP
to receive or increase the amount of Incentive Distributions (as such term is
defined in the MLP Agreement) or (B) hasten the conversion of Subordinated Units
(as such term is defined in the MLP Agreement) into Common Units.

      (c) Whenever a particular transaction, arrangement or resolution of a
conflict of interest is required under this Agreement to be "fair and
reasonable" to any Person, the fair and reasonable nature of such transaction,
arrangement or resolution shall be considered in the context of all similar or
related transactions.

      6.11 OTHER MATTERS CONCERNING THE GENERAL PARTNERS AND THE PARTNERSHIP
POLICY COMMITTEE, (a) The General Partners and the Partnership Policy Committee
may rely and shall be protected in acting or refraining from acting upon any
resolution, certificate, statement, instrument, opinion, report, notice,
request, consent, order, bond, debenture, or other paper or document believed by
it to be genuine and to have been signed or presented by the proper party or
parties.

      (b) The General Partners and the Partnership Policy Committee may consult
with legal counsel, accountants, appraisers, management consultants, investment
bankers and other consultants and advisers selected by it, and any act taken or
omitted to be taken in reliance upon the opinion (including, without limitation,
an Opinion of Counsel) of such Persons as to matters that the General Partners
and the Partnership Policy Committee reasonably believe to be within such
Person's professional or expert competence shall be conclusively presumed to
have been done or omitted in good faith and in accordance with such opinion.

      (c) The Partnership Policy Committee shall have the right, in respect of
any of its powers or obligations hereunder, to act through any of the duly
authorized officers of the Partnership or the General Partners and their duly
appointed attorney or attorneys-in-fact. Each such attorney shall, to the extent
provided by the Partnership Policy Committee in the power of attorney, have full
power and authority to do and perform each and every act and duty that is
permitted or required to be done by the Partnership Policy Committee hereunder.

      (d) Any standard of care and duty imposed by this Agreement or under the
Delaware Act or any applicable law, rule or regulation shall be modified, waived
or limited as required to permit the

                                      33
<PAGE>

General Partners and the members of the Partnership Policy Committee to act
under this Agreement or any other agreement contemplated by this Agreement and
to make any decision pursuant to the authority prescribed in this Agreement so
long as such action is reasonably believed by the General Partners or the
members of the Partnership Policy Committee, as applicable, to be in, or not
inconsistent with, the best interests of the Partnership.

      6.12 TITLE TO PARTNERSHIP ASSETS. Title to Partnership assets, whether
real, personal or mixed and whether tangible or intangible, shall be deemed to
be owned by the Partnership as an entity, and no Partner, individually or
collectively, shall have any ownership interest in such Partnership assets or
any portion thereof. Title to any or all of the Partnership assets may be held
in the name of the Partnership, the General Partners, one or more of their
Affiliates or one or more nominees, as the Partnership Policy Committee may
determine. Each General Partner hereby declares and warrants that any
Partnership assets for which record title is held in the name of such General
Partner or one or more of its Affiliates or one or more nominees shall be held
by such General Partner or such Affiliate or nominee for the use and benefit of
the Partnership in accordance with the provisions of this Agreement; provided,
however, that such General Partner shall use its reasonable efforts to cause
record title to such assets (other than those assets in respect of which such
General Partner determines that the expense and difficulty of conveyancing makes
transfer of record title to the Partnership impracticable) to be vested in the
Partnership as soon as reasonably practicable; provided that, prior to the
withdrawal or removal of such General Partner or as soon thereafter as
practicable, such General Partner shall use reasonable efforts to effect the
transfer of record title to the Partnership and, prior to any such transfer,
will provide for the use of such assets in a manner satisfactory to the
Partnership. All Partnership assets shall be recorded as the property of the
Partnership in its books and records, irrespective of the name in which record
title to such Partnership assets is held.

      6.13 SPECIAL PROVISIONS REGARDING PARTNERSHIP'S INTEREST IN NORTHERN
BORDER PIPELINE. (a) Subject to the terms of the Northern Border Pipeline
Partnership Agreement and for so long as the Partnership owns an interest in
Northern Border Pipeline, each General Partner shall have the right to designate
one representative of the Partnership on the NBPL Management Committee. Each
such designated representative shall serve in such capacity until his successor
or replacement shall have been appointed by the General Partner that originally
appointed such member. The appointment of any such successor or replacement,
which decision may be made in the sole discretion of the appointing General
Partner from time to time, shall become effective upon the delivery by the
appointing General Partner of written notice to each other General Partner. Each
General Partner hereby designates as its initial representative on the NBPL
Management Committee the individual designated by it to serve on the Partnership
Policy Committee. Each General Partner may designate one or more persons to act
as alternate representatives of the Partnership on the NBPL Management
Committee, who may replace such representatives at any meeting of the NBPL
Management Committee.

      (b) The voting power of the Partnership's representatives on the NBPL
Management Committee shall be allocated among the Partnership's representatives
on such committee in accordance with the relative General Partner Percentage
Interests of the General Partners. Each representative of the Partnership on the
NBPL Management Committee shall be entitled to vote its allocated portion of the
Partnership's voting power on the NBPL Management Committee independent of the
decision of the other representatives of the Partnership with respect to their
allocated percentage of such voting power; provided, however, that each such
representative shall be required to obtain the approval of the Limited Partners
prior to voting its allocated portion of the Partnership's voting power on the
NBPL Management Committee in favor of (A) the sale, exchange or other
disposition of all or substantially all of Northern Border Pipeline's assets in
a single

                                       34
<PAGE>

transaction or in a series of related transactions or (B) the liquidation or
merger, consolidation or other combination of Northern Border Pipeline with or
into another entity.

      (c) Subject to the terms of the Northern Border Pipeline Partnership
Agreement and regardless of whether one or more of the Partnership's
representatives on the NBPL Management Committee vote for or against a NBPL
Capital Project that is approved by the requisite vote of the NBPL Management
Committee (including any such NBPL Capital Project that is approved following an
arbitration proceeding as provided for under the Northern Border Pipeline
Partnership Agreement), the Partnership Policy Committee shall cause the
Partnership to participate in such NBPL Capital Project to the full extent of
its interest in Norther Border Pipeline and to fund its pro rata share of any
capital contributions required to be made by the Partnership as a general
partner of Northern Border Pipeline in respect thereof.

      6.14 RELIANCE BY THIRD PARTIES. Notwithstanding anything to the contrary
in this Agreement, any Person dealing with the Partnership shall be entitled to
assume that the Partnership Policy Committee and any officer of the Partnership
authorized by the Partnership Policy Committee to act on behalf and in the name
of the Partnership has full power and authority to encumber, sell or otherwise
use in any manner any and all assets of the Partnership and to enter into any
contracts on behalf of the Partnership, and such Person shall be entitled to
deal with the Partnership Policy Committee or any such officer as if it were the
Partnership's sole party in interest, both legally and beneficially. Each
Limited Partner hereby waives any and all defenses or other remedies that may be
available against such Person to contest, negate or disaffirm any action of the
Partnership Policy Committee or any such officer in connection with any such
dealing. In no event shall any Person dealing with the Partnership Policy
Committee or any such officer be obligated to ascertain that the terms of this
Agreement have been complied with or to inquire into the necessity or expedience
of any act or action of the Partnership Policy Committee or any such officer.
Each and every certificate, document or other instrument executed on behalf of
the Partnership by the Partnership Policy Committee or any such officer shall be
conclusive evidence in favor of any and every Person relying thereon or claiming
thereunder that (a) at the time of the execution and delivery of such
certificate, document or instrument, this Agreement was in full force and
effect, (b) the Person executing and delivering such certificate, document or
instrument was duly authorized and empowered to do so for and on behalf of the
Partnership and (c) such certificate, document or instrument was duly executed
and delivered in accordance with the terms and provisions of this Agreement and
is binding upon the Partnership.

                                   ARTICLE VII
                   RIGHTS AND OBLIGATIONS OF LIMITED PARTNERS

      7.1 LIMITATION OF LIABILITY. The Limited Partners shall have no liability
under this Agreement except as expressly provided in this Agreement or the
Delaware Act.

      7.2 MANAGEMENT OF BUSINESS. No Limited Partner (other than the General
Partners, any of their Affiliates or any officer, director, employee, partner,
agent or trustee of the Partnership, General Partners or any of their
Affiliates, in its capacity as such, if such Person shall also be a Limited
Partner) shall participate in the operation, management or control (within the
meaning of the Delaware Act) of the Partnership's business, transact any
business in the Partnership's name or have the power to sign documents for or
otherwise bind the Partnership. The transaction of any such business by the
Partnership Policy Committee, the General Partners, any of their Affiliates or
any officer, director, employee, partner, agent or trustee of the Partnership,
the General Partners or any

                                       35

<PAGE>

of its Affiliates, in its capacity as such, shall not affect, impair or
eliminate the limitations on the liability of the Limited Partners under this
Agreement.

      7.3 RETURN OF CAPITAL. No Limited Partner shall be entitled to the
withdrawal or return of his Capital Contribution, except to the extent, if any,
that distributions made pursuant to this Agreement or upon termination of the
Partnership may be considered as such by law and then only to the extent
provided for in this Agreement. No Limited Partner shall have priority over any
other Limited Partner either as to the return of Capital Contributions or as to
profits, losses or distributions.

      7.4 RIGHTS OF LIMITED PARTNERS RELATING TO THE PARTNERSHIP. (a) In
addition to other rights provided by this Agreement or by applicable law, and
except as limited by Section 7.4(b), each Limited Partner shall have the right,
for a purpose reasonably related to such Limited Partner's interest as a limited
partner in the Partnership, upon reasonable demand and at such Limited Partner's
own expense:

            (i) to obtain true and full information regarding the status of the
      business and financial condition of the Partnership;

            (ii) promptly after becoming available, to obtain a copy of the
      Partnership's federal, state and local tax returns for each year;

            (iii) to have furnished to him, upon notification to the
      Partnership, a current list of the name and last known business, residence
      or mailing address of each Partner;

            (iv) to have furnished to him, upon notification to the Partnership,
      a copy of this Agreement, the Administrative Services Agreement and the
      Certificate of Limited Partnership and all amendments thereto, together
      with a copy of the executed copies of all powers of attorney pursuant to
      which this Agreement, the Certificate of Limited Partnership and all
      amendments thereto have been executed;

            (v) to obtain true and full information regarding the amount of cash
      and description and statement of the Agreed Value of any other Capital
      Contribution by each Partner and which each Partner has agreed to
      contribute in the future, and the date on which each became a Partner; and

            (vi) to obtain such other information regarding the affairs of the
      Partnership as is just and reasonable.

      (b) Notwithstanding any other provision of this Agreement, the Partnership
Policy Committee may keep confidential from the Limited Partners, for such
period of time as the Partnership Policy Committee deems reasonable, any
information that the Partnership Policy Committee reasonably believes to be in
the nature of trade secrets or other information the disclosure of which the
Partnership Policy Committee in good faith believes is not in the best interests
of the Partnership or Northern Border Pipeline or could damage the Partnership
or Northern Border Pipeline or that the Partnership or Northern Border Pipeline
is required by law or by agreements with third parties to keep confidential
(other than agreements with Affiliates of the General Partners the primary
purpose of which is to circumvent the obligations set forth in this Section
7.4).

                                       36

<PAGE>

                                  ARTICLE VIII
                     BOOKS, RECORDS, ACCOUNTING AND REPORTS

      8.1 RECORDS AND ACCOUNTING. The Partnership Policy Committee shall keep or
cause to be kept at the principal office of the Partnership appropriate books
and records with respect to the Partnership's business, including, without
limitation, all books and records necessary to provide to the Limited Partners
any information, lists and copies of documents required to be provided pursuant
to Section 7.4(a). Any books and records maintained by or on behalf of the
Partnership in the regular course of its business, including, without
limitation, books of account and records of Partnership proceedings, may be kept
on, or be in the form of, computer disks, hard disks, punch cards, magnetic
tape, photographs, micrographics or any other information storage device,
provided, that the books and records so maintained are convertible into clearly
legible written form within a reasonable period of time. The books of the
Partnership shall be maintained, for financial reporting purposes, on an accrual
basis in accordance with generally accepted accounting principles.

      8.2 FISCAL YEAR. The fiscal year of the Partnership shall be the calendar
year.

                                   ARTICLE IX
                                   TAX MATTERS

      9.1 PREPARATION OF TAX RETURNS. The Partnership Policy Committee shall
arrange for the preparation and timely filing of all returns of Partnership
income, gains, deductions, losses and other items required of the Partnership
for federal and state income tax purposes and shall use all reasonable efforts
to furnish, within 90 days of the close of each taxable year of the Partnership,
the tax information reasonably required by the Partners for federal and state
income tax reporting purposes. The classification, realization and recognition
of income, gain, losses and deductions and other items shall be on the accrual
method of accounting for federal income tax purposes. The taxable year of the
Partnership shall be the calendar year.

      9.2 TAX ELECTIONS. Except as otherwise provided herein, the Partnership
Policy Committee shall, in its sole discretion, determine whether to make any
available election pursuant to the Code; provided, however, that the Partnership
Policy Committee shall make the election under Section 754 of the Code in
accordance with applicable regulations thereunder. The Partnership Policy
Committee shall have the right to seek to revoke any such election (including,
without limitation, the election under Section 754 of the Code) upon the
Partnership Policy Committee's determination in its sole discretion that such
revocation is in the best interests of the Limited Partners.

      9.3 TAX CONTROVERSIES. Subject to the provisions hereof, Northern Plains
is designated the Tax Matters Partner (as defined in Section 6231 of the Code),
and is authorized and required to represent the Partnership (at the
Partnership's expense) in connection with all examinations of the Partnership's
affairs by tax authorities, including, without limitation, resulting
administrative and judicial proceedings, and to expend Partnership funds for
professional services and costs associated therewith. Each Partner agrees to
cooperate with the Partnership Policy Committee and to do or refrain from doing
any or all things reasonably required by the Partnership Policy Committee to
conduct such proceedings.

      9.4 ORGANIZATIONAL EXPENSES. The Partnership shall elect to deduct
expenses, if any, incurred by it in organizing the Partnership ratably over a
60-month period as provided in Section 709 of the Code.

                                       37

<PAGE>

      9.5 WITHHOLDING. Notwithstanding any other provision of this Agreement,
the Partnership Policy Committee is authorized to take any action that it
determines in its sole discretion to be necessary or appropriate to cause the
Partnership to comply with any withholding requirements established under the
Code or any other federal, state or local law including, without limitation,
pursuant to Sections 1441, 1442, 1445 and 1446 of the Code. To the extent that
the Partnership is required to withhold and pay over to any taxing authority any
amount resulting from the allocation or distribution of income to any Partner
(including, without limitation, by reason of Section 1446 of the Code), the
amount withheld shall be treated as a distribution of cash pursuant to Section
5.3 in the amount of such withholding from such Partner.

      9.6 OPINIONS OF COUNSEL. Notwithstanding any other provision of this
Agreement, if the Partnership or Northern Border Pipeline is treated as an
association taxable as a corporation at any time or is otherwise taxable for
federal income tax purposes as an entity at any time and, pursuant to the
provisions of this Agreement, an Opinion of Counsel would otherwise be required
to the effect that an action will not cause the Partnership or Northern Border
Pipeline to become so treated as an association taxable as a corporation or
otherwise taxable as an entity for federal income tax purposes, such requirement
for an Opinion of Counsel shall be deemed automatically waived.

                                    ARTICLE X
                              TRANSFER OF INTERESTS

      10.1 TRANSFER. (a) The term "TRANSFER," when used in this Article X with
respect to a Partnership Interest, shall be deemed to refer to a transaction by
which a Partner disposes of its Partnership Interest to another Person and
includes a sale, assignment, gift, pledge, encumbrance, hypothecation, mortgage,
exchange or any other disposition by law or otherwise.

      (b) No Partnership Interest shall be transferred, in whole or in part,
except in accordance with the terms and conditions set forth in this Article X.
Any transfer or purported transfer of a Partnership Interest not made in
accordance with this Article X shall be null and void.

      (c) Nothing contained in this Article X shall be construed to prevent a
disposition by the parent entity of a General Partner of all of the issued and
outstanding capital stock of such General Partner.

      10.2 TRANSFER OF A GENERAL PARTNER'S PARTNERSHIP INTEREST. If a general
partner of the MLP transfers its partnership interest as a general partner
therein to any Person in accordance with the provisions of the MLP Agreement,
the corresponding General Partner of the Partnership shall contemporaneously
therewith transfer its Partnership Interest as a general partner of the
Partnership to such Person, and the Limited Partners hereby expressly consent to
such transfer. Except as set forth in the immediately preceding sentence, a
General Partner may not transfer all or any part of its Partnership Interest as
a general partner in the Partnership.

      10.3 TRANSFER OF THE LIMITED PARTNER'S PARTNERSHIP INTEREST. If a Limited
Partner merges, consolidates or otherwise combines into any other Person or
transfers all or substantially all of its assets to another Person, such Person
may become a Substituted Limited Partner pursuant to Article XI. Except for the
transfers by the Initial Limited Partners of their Partnership Interests as
limited partners in the Partnership to the Initial Substituted Limited Partner
(as provided in the Conveyance Agreement) and except as set forth in the
immediately preceding sentence, a Limited Partner may not transfer all or any
part of its Partnership Interest as a limited partner or withdraw from the
Partnership.

                                       38

<PAGE>

                                   ARTICLE XI
                              ADMISSION OF PARTNERS

      11.1 ADMISSION OF INITIAL LIMITED PARTNERS AND INITIAL SUBSTITUTED LIMITED
PARTNER. Upon the making by Northern Plains, Pan Border and Northwest Border of
the Capital Contributions described in Section 4.1 and the issuance by the
Partnership to such Persons of the Partnership Interests described in Section
4.1 as being issued to such Persons, the Partnership Policy Committee shall be
deemed to have admitted such Persons to the Partnership as Initial Limited
Partners in respect of such Partnership Interests. Upon the transfer by such
Initial Limited Partners of such Partnership Interests to the Initial
Substituted limited Partner as provided in the Conveyance Agreement, the
Partnership Policy Committee shall be deemed to have admitted the Initial
Substituted Limited Partner to the Partnership as a Limited Partner in respect
of such Partnership Interests.

      11.2 ADMISSION OF SUBSTITUTED LIMITED PARTNER. Any Person that is the
successor in interest to a Limited Partner as described in Section 10.3 (other
than the Initial Substituted Limited Partner, whose admission to the Partnership
shall be governed by the terms of Section 11.1) shall be admitted to the
Partnership as a limited partner upon (a) furnishing to the Partnership Policy
Committee (i) acceptance in form satisfactory to the Partnership Policy
Committee of all of the terms and conditions of this Agreement and (ii) such
other documents or instruments as may be required to effect its admission as a
limited partner in the Partnership and (b) obtaining the consent of the
Partnership Policy Committee, which consent may be withheld or granted in the
sole discretion of the Partnership Policy Committee. Such Person shall be
admitted to the Partnership as a limited partner immediately prior to the
transfer of the Partnership Interest, and the business of the Partnership shall
continue without dissolution.

      11.3 ADMISSION OF SUCCESSOR GENERAL PARTNER. A successor General Partner
approved pursuant to Section 12.1 or 12.2 or the transferee of or successor to
all of a General Partner's Partnership Interest as a general partner in the
Partnership pursuant to Section 10.2 who is proposed to be admitted as a
successor General Partner shall, subject to compliance with the terms of Section
12.3, be admitted to the Partnership as a General Partner, effective immediately
prior to the withdrawal or removal of such General Partner pursuant to Section
12.1 or 12.2 or the transfer of a General Partner's Partnership Interest as a
general partner in the Partnership pursuant to Section 10.2. Any such successor,
together with any remaining General Partners, shall, subject to the terms
hereof, carry on the business of the Partnership without dissolution. In each
case, the admission of such successor General Partner to the Partnership shall
be subject to the execution by such successor General Partner of an acceptance
of all of the terms and conditions of this Agreement and such other documents or
instruments as may be required to effect such admission.

      11.4 ADMISSION OF ADDITIONAL LIMITED PARTNERS. (a) A Person (other than a
General Partner or a Substituted Limited Partner) who makes a Capital
Contribution to the Partnership in accordance with this Agreement shall be
admitted to the Partnership as an Additional Limited Partner only upon
furnishing to the Partnership Policy Committee (i) evidence of acceptance in
form satisfactory to the Partnership Policy Committee of all of the terms and
conditions of this Agreement, including, without limitation, the power of
attorney granted in Section 1.4, and (ii) such other documents or instruments as
may be required in the discretion of the Partnership Policy Committee to effect
such Person's admission as an Additional Limited Partner.

      (b) Notwithstanding anything to the contrary in this Section 11.4, no
Person shall be admitted as an Additional Limited Partner without the consent of
the Partnership Policy Committee, which consent may be given or withheld in the
Partnership Policy Committee's sole discretion. The

                                       39

<PAGE>

admission of any Person as an Additional Limited Partner shall become effective
on the date upon which the name of such Person is recorded as such in the books
and records of the Partnership, following the consent of the Partnership Policy
Committee to such admission.

      11.5 AMENDMENT OF AGREEMENT AND CERTIFICATE OF LIMITED PARTNERSHIP. To
effect the admission to the Partnership of any Partner, the Partnership Policy
Committee shall take all steps necessary and appropriate under the Delaware Act
to amend the records of the Partnership to reflect such admission and, if
necessary, to prepare as soon as practical an amendment of this Agreement and,
if required by law, to prepare and file an amendment to the Certificate of
Limited Partnership and may for this purpose, among others, exercise the power
of attorney granted pursuant to Section 1.4.

                                   ARTICLE XII
                        WITHDRAWAL OR REMOVAL OF PARTNERS

      12.1 WITHDRAWAL OF A GENERAL PARTNER. (a) A General Partner shall be
deemed to have withdrawn from the Partnership upon the occurrence of any one of
the following events (each such event herein referred to as an "EVENT OF
WITHDRAWAL");

            (i) a General Partner voluntarily withdraws from the Partnership by
      giving written notice to the other Partners;

            (ii) a General Partner transfers all of its rights as General
      Partner pursuant to Section 10.2;

            (iii) a General Partner is removed pursuant to Section 12.2;

            (iv) such General Partner, in its capacity as a general partner of
      the MLP, withdraws from or is removed as a general partner of the MLP;

            (v) a General Partner (A) makes a general assignment for the benefit
      of creditors; (B) files a voluntary bankruptcy petition; (C) files a
      petition or answer seeking for itself a reorganization, arrangement,
      composition, readjustment, liquidation, dissolution or similar relief
      under any law; (D) files an answer or other pleading admitting or failing
      to contest the material allegations of a petition filed against such
      General Partner in a proceeding of the type described in clauses (A)-(C)
      of this Section 12.1(a)(v); or(E) seeks, consents to or acquiesces in the
      appointment of a trustee, receiver or liquidator of such General Partner
      or of all or any substantial part of its properties;

            (vi) a final and non-appealable judgment is entered by a court with
      appropriate jurisdiction ruling that a General Partner is bankrupt or
      insolvent, or a final and non-appealable order for relief is entered by a
      court with appropriate jurisdiction against a General Partner, in each
      case under any federal or state bankruptcy or insolvency laws as now or
      hereafter in effect; or

            (vii) a certificate of dissolution or its equivalent is filed for a
      General Partner, or 90 days expire after the date of notice to a General
      Partner of revocation of its charter without a reinstatement of its
      charter, under the laws of its state of incorporation.

                                       40

<PAGE>

If an Event of Withdrawal specified in Section 12.1 (a)(v), (vi) or (vii)
occurs, the withdrawing General Partner shall give notice to the Limited
Partners within 30 days after such occurrence. The Partners hereby agree that
only the Events of Withdrawal described in this Section 12.1 shall result in the
withdrawal of a General Partner from the Partnership.

      (b) Withdrawal of a General Partner from the Partnership upon the
occurrence of an Event of Withdrawal shall not constitute a breach of this
Agreement under the following circumstances:

            (i) at any time during the period beginning on the Closing Date and
      ending at 12:00 Midnight, Central Standard Time, on December 31, 2003, a
      General Partner voluntarily withdraws by giving at least 90 days' advance
      notice of its intention to withdraw to the Limited Partners, provided,
      that prior to the effective date of such withdrawal the withdrawal is
      approved by the Limited Partners and such General Partner delivers to the
      Partnership an Opinion of Counsel ("WITHDRAWAL OPINION OF COUNSEL") that
      such withdrawal (following the purchase by one or more of the remaining
      General Partners of the Combined Interest (as such term is defined in the
      MLP Agreement) of such Departing Partner pursuant to Section 11.7(b) of
      the MLP Agreement or the selection of a successor General Partner, as
      applicable) would not result in the loss of the limited liability of any
      Limited Partner or cause the Partnership or Northern Border Pipeline to be
      treated as an association taxable as a corporation or otherwise to be
      taxed as an entity for federal income tax purposes;

            (ii) at any time after 12:00 Midnight, Central Standard Time, on
      December 31, 2003, a General Partner voluntarily withdraws by giving at
      least 90 days' advance notice to the Limited Partners, such withdrawal to
      take effect on the date specified in such notice; or

            (iii) at any time that a General Partner ceases to be a General
      Partner pursuant to Section 12.1(a)(ii).

If a General Partner gives a notice of withdrawal pursuant to Section 12.1(a)(i)
or an Event of Withdrawal of the type described in Sections 12.1(a)(v)-(vii)
occurs, and in any such case one or more of the remaining General Partners do
not elect to purchase the Combined Interest of such Departing Partner pursuant
to Section 11.7(b) of the MLP Agreement, the Limited Partners may, prior to the
effective date of such withdrawal, elect a successor General Partner; provided,
however, that such successor shall be the same person, if any, that is elected
pursuant to Section 13.1 of the MLP Agreement as the successor to such General
Partner in its capacity as a general partner of the MLP. If, prior to the
effective date of a General Partner's withdrawal, one or more of the remaining
General Partners have not elected to purchase the Combined Interest of such
Departing Partner pursuant to Section 11.7(b) of the MLP Agreement and a
successor is not selected by the Limited Partners as provided herein, or the
Partnership does not receive a Withdrawal Opinion of Counsel, the Partnership
shall be dissolved in accordance with Section 13.1. Any successor General
Partner elected in accordance with the terms of this Section 12.1 shall be
subject to the provisions of Section 11.3.

      12.2 REMOVAL OF A GENERAL PARTNER. A General Partner shall be removed if
such General Partner is removed as a general partner of the MLP pursuant to
Section 13.2 of the MLP Agreement. Such removal shall be effective concurrently
with the effectiveness of the removal of such General Partner as a general
partner of the MLP pursuant to the terms of the MLP Agreement. If a successor
General Partner is elected in connection with the removal of such General
Partner as a general partner of the MLP, such successor General Partner shall,
upon admission pursuant to Article XI,

                                       41
<PAGE>

automatically become a successor General Partner of the Partnership. The
admission of any such successor General Partner to the Partnership shall be
subject to the provisions of Section 11.3.

      12.3 INTEREST OF DEPARTING PARTNER AND SUCCESSOR GENERAL PARTNER. The
Partnership Interest of a Departing Partner departing as a result of withdrawal
or removal pursuant to Section 12.1 or 12.2 shall (unless it is otherwise
required to be converted into Common Units pursuant to Section 13.3(b) of the
MLP Agreement) be purchased by the successor to the Departing Partner for cash
in the manner specified in the MLP Agreement. Such purchase (or conversion into
Common Units, as applicable) shall be a condition to the admission to the
Partnership of the successor as a General Partner.

      12.4 REIMBURSEMENT OF DEPARTING PARTNER. A Departing Partner shall be
entitled to receive all reimbursements due such Departing Partner pursuant to
Section 6.4, including, without limitation, any employee-related liabilities
(including, without limitation, severance liabilities), incurred in connection
with the termination of any employees employed by such Departing Partner for the
benefit of the Partnership.

      12.5 WITHDRAWAL OF THE LIMITED PARTNER. Without the prior consent of the
Partnership Policy Committee, which may be granted or withheld in its sole
discretion, the Limited Partner shall not have the right to withdraw from the
Partnership.

                                  ARTICLE XIII
                           DISSOLUTION AND LIQUIDATION

      13.1 DISSOLUTION. The Partnership shall not be dissolved by the admission
of the Initial Limited Partners, the Initial Substituted Limited Partner,
Substituted Limited Partners or Additional Limited Partners or by the admission
of a successor General Partner in accordance with the terms of this Agreement.
Upon the removal or withdrawal of a General Partner, if one or more of the
remaining General Partners agrees to purchase the Combined Interest of such
Departing Partner pursuant to Section 11.7 of the MLP Agreement, or if a Person
becomes a successor General Partner pursuant to Section 12.1 or 12.2, the
Partnership shall not be dissolved and the remaining General Partners and/or
such successor General Partner shall continue the business of the Partnership.
The Partnership shall dissolve, and (subject to Section 13.2) its affairs should
be wound up, upon:

            (a) the expiration of its term as provided in Section 1.5;

            (b) an Event of Withdrawal of a General Partner as provided in
      Section 12.1 (a) (other than Section 12.1(a)(ii)), unless (i) one or more
      of the remaining General Partners agrees to purchase the Combined Interest
      of such Departing Partner pursuant to Section 11.7(b) of the MLP Agreement
      or (ii) a Person becomes a successor General Partner and an Opinion of
      Counsel is received as provided in Section 12.1(b) or 12.2 and such
      successor is admitted to the Partnership pursuant to Section 11.3;

            (c) an election by the Partnership Policy Committee to dissolve the
      Partnership that is approved by the Limited Partners;

            (d) entry of a decree of judicial dissolution of the Partnership
      pursuant to the provisions of the Delaware Act;

                                       42

<PAGE>

            (e) the sale of all or substantially all of the assets and
      properties of the Partnership; or

            (f) the dissolution of the MLP.

      13.2 CONTINUATION OF THE BUSINESS OF THE PARTNERSHIP AFTER DISSOLUTION.
Upon (a) dissolution of the Partnership following an Event of Withdrawal caused
by the withdrawal or removal of a General Partner as provided in Section 12.1
(a)(i) or (iii) and the failure to occur of either (i) the purchase by one or
more of the remaining General Partners of such Departing Partner's Combined
Interest pursuant to Section 11.7(b) of the MLP Agreement or (ii) the selection
of a successor to such Departing Partner pursuant to Section 12.1 or 12.2, then
within 90 days thereafter or (b) dissolution of the Partnership upon an event
constituting an Event of Withdrawal as defined in Section 12.1 (a) (v), (vi) or
(vii) and the failure to occur of either (i) the purchase by one or more of the
remaining General Partners of such Departing Partner's Combined Interest
pursuant to Section 11.7(b) of the MLP Agreement or (ii) the selection of a
successor to such Departing Partner pursuant to Section 12.1 or 12.2, then
within 180 days thereafter, the Limited Partners may elect to reconstitute the
Partnership and continue its business on the same terms and conditions set forth
in this Agreement by forming a new limited partnership on terms identical to
those set forth in this Agreement and having as the successor general partners
the remaining General Partners (if they desire to continue in such capacity)
and/or a Person approved by the Limited Partners. In addition, upon dissolution
of the Partnership pursuant to Section 13.1(f), if the MLP is reconstituted
pursuant to Section 14.2 of the MLP Agreement, the Limited Partners may, within
180 days after such event of dissolution, elect to reconstitute the Partnership
in accordance with the immediately preceding sentence. Upon any such election by
the Limited Partners, all Partners shall be bound thereby and shall be deemed to
have approved same. Unless such an election is made within the applicable time
period as set forth above, the Partnership shall conduct only activities
necessary to wind up its affairs. If such an election is so made, then:

            (i) the reconstituted Partnership shall continue until the end of
      the term set forth in Section 1.5 unless earlier dissolved in accordance
      with this Article XIII;

            (ii) if one or more of the successor General Partners is not a
      former General Partner, or if one or more of the remaining General
      Partners does not desire to continue as a General Partner, then the
      interest of such former General Partner and/or such remaining General
      Partners shall be purchased by the successor General Partner(s) or
      converted into Common Units as provided in the MLP Agreement; and

            (iii) all necessary steps shall be taken to cancel this Agreement
      and the Certificate of Limited Partnership and to enter into and, as
      necessary, to file a new partnership agreement and certificate of limited
      partnership, and the remaining General Partner(s) and such successor
      General Partner may for this purpose exercise the powers of attorney
      granted the members of the Partnership Policy Committee pursuant to
      Section 1.4; provided, that the right to approve a successor General
      Partner and to reconstitute and to continue the business of the
      Partnership shall not exist and may not be exercised unless the
      Partnership has received an Opinion of Counsel that (x) the exercise of
      the right would not result in the loss of limited liability of any Limited
      Partner and (y) neither the Partnership, the reconstituted limited
      partnership nor Northern Border Pipeline would be treated as an
      association taxable as a corporation or otherwise be taxable as an entity
      for federal income tax purposes upon the exercise of such right to
      continue.

                                       43

<PAGE>

      13.3 LIQUIDATION. Upon dissolution of the Partnership, unless the
Partnership is continued under an election to reconstitute and continue the
Partnership pursuant to Section 13.2, the Partnership Policy Committee or its
designee, or if it fails to act, a liquidator or liquidating committee approved
by the Limited Partners, shall be the Liquidator. The Liquidator (if other than
the Partnership Policy Committee or its designee) shall be entitled to receive
such compensation for its services as may be approved by the Limited Partners.
The Liquidator shall agree not to resign at any time without 15 days' prior
notice and (if other than the Partnership Policy Committee or its designee) may
be removed at any time, with or without cause, by notice of removal approved by
the Limited Partners. Upon dissolution, removal or resignation of the
Liquidator, a successor and substitute Liquidator (who shall have and succeed to
all rights, powers and duties of the original Liquidator) shall within 30 days
thereafter be approved by the Limited Partners. The right to approve a successor
or substitute Liquidator in the manner provided herein shall be deemed to refer
also to any such successor or substitute Liquidator approved in the manner
herein provided. Except as expressly provided in this Article XIII, the
Liquidator approved in the manner provided herein shall have and may exercise,
without further authorization or consent of any of the parties hereto, all of
the powers conferred upon the Partnership Policy Committee and the General
Partners under the terms of this Agreement (but subject to all of the applicable
limitations, contractual and otherwise, upon the exercise of such powers, other
than the limitation on sale set forth in Section 6.4(b)) to the extent necessary
or desirable in the good faith judgment of the Liquidator to carry out the
duties and functions of the Liquidator hereunder for and during such period of
time as shall be reasonably required in the good faith judgment of the
Liquidator to complete the winding-up and liquidation of the Partnership as
provided for herein. The Liquidator shall liquidate the assets of the
Partnership, and apply and distribute the proceeds of such liquidation in the
following order of priority, unless otherwise required by mandatory provisions
of applicable law:

            (a) the payment to creditors of the Partnership, including, without
      limitation, Partners who are creditors, in the order of priority provided
      by law; and the creation of a reserve of cash or other assets of the
      Partnership for contingent liabilities in an amount, if any, determined by
      the Liquidator to be appropriate for such purposes; and

            (b) to all Partners in accordance with, and to the extent of, the
      positive balances in their respective Capital Accounts, as determined
      after taking into account all Capital Account adjustments (other than
      those made by reason of this clause) for the taxable year of the
      Partnership during which the liquidation of the Partnership occurs (with
      the date of such occurrence being determined pursuant to Treasury
      Regulation Section 1.704-1(b)(2)(ii)(g)); and such distribution shall be
      made by the end of such taxable year (or, if later, within 90 days after
      said date of such occurrence).

      13.4 DISTRIBUTIONS IN KIND. (a) Notwithstanding the provisions of Section
13.3, which require the liquidation of the assets of the Partnership, but
subject to the order of priorities set forth therein, if prior to or upon
dissolution of the Partnership the Liquidator determines that an immediate sale
of part or all of the Partnership's assets would be impractical or would cause
undue loss to the Partners, the Liquidator may, in its absolute discretion,
defer for a reasonable time the liquidation of any assets except those necessary
to satisfy liabilities of the Partnership (including, without limitation, those
to Partners as creditors) and/or distribute to the Partners or to specific
classes of Partners, in lieu of cash, as tenants in common and in accordance
with the provisions of Section 13.3, undivided interests in such Partnership
assets as the Liquidator deems not suitable for liquidation. Any such
distributions in kind shall be made only if, in the good faith judgment of the
Liquidator, such distributions in kind are in the best interest of the Limited
Partners, and shall be subject to such conditions relating to the disposition
and management of such properties as the Liquidator deems

                                       44

<PAGE>

reasonable and equitable and to any agreements governing the operation of such
properties at such time. The Liquidator shall determine the fair market value of
any property distributed in kind using such reasonable method of valuation as it
may adopt.

      (b) In accordance with Section 704(c)(1)(B) of the Code, in the case of
any deemed distribution occurring as a result of a termination of the
Partnership pursuant to Section 708(b)(1)(B) of the Code, to the maximum extent
possible consistent with the priorities of Section 13.3, the Partnership Policy
Committee shall have sole discretion to treat the deemed distribution of
Partnership assets to Partners as occurring in a manner that will not cause a
shift of the Book-Tax Disparity attributable to a Partnership asset existing
immediately prior to the deemed distribution to another asset upon the deemed
contribution of assets to the reconstituted Partnership, including, without
limitation, deeming the distribution of any Partnership assets to be made either
to the Partner who contributed such assets or to the transferee of such Partner.

      13.5 CANCELLATION OF CERTIFICATE OF LIMITED PARTNERSHIP. Upon the
completion of the distribution of Partnership cash and property as provided in
Sections 13.3 and 13.4 in connection with the liquidation of the Partnership,
the Partnership shall be terminated and the Certificate of Limited Partnership
and all qualifications of the Partnership as a foreign limited partnership in
jurisdictions other than the State of Delaware shall be cancelled and such other
actions as may be necessary to terminate the Partnership shall be taken.

      13.6 REASONABLE TIME FOR WINDING UP. A reasonable time shall be allowed
for the orderly winding up of business and affairs of the Partnership and the
liquidation of its assets pursuant to Section 13.3 in order to minimize any
losses otherwise attendant upon such winding up, and the provisions of this
Agreement shall remain in effect between the Partners during the period of
liquidation.

      13.7 RETURN OF CAPITAL. The General Partners shall not be personally
liable for, and shall have no obligation to contribute or loan any monies or
property to the Partnership to enable it to effectuate, the return of the
Capital Contributions of the Limited Partners, or any portion thereof, it being
expressly understood that any such return shall be made solely from Partnership
assets.

      13.8 NO CAPITAL ACCOUNT RESTORATION. No Partner shall have any obligation
to restore any negative balance in its Capital Account upon liquidation of the
Partnership.

      13.9 WAIVER OF PARTITION. Each Partner hereby waives any right to
partition of the Partnership property.

                                   ARTICLE XIV
                       AMENDMENT OF PARTNERSHIP AGREEMENT

      14.1 AMENDMENT TO BE ADOPTED SOLELY BY PARTNERSHIP POLICY COMMITTEE. Each
Limited Partner agrees that the Partnership Policy Committee (pursuant to its
powers of attorney from the Limited Partners), without the approval of any
Limited Partner, may amend any provision of this Agreement, and execute, swear
to, acknowledge, deliver, file and record whatever documents may be required in
connection therewith, to reflect:

            (a) a change in the name of the Partnership, the location of the
      principal place of business of the Partnership, the registered agent of
      the Partnership or the registered office of the Partnership;

                                       45

<PAGE>

            (b) admission, substitution, withdrawal or removal of Partners in
      accordance with this Agreement;

            (c) a change that, in the sole discretion of the Partnership Policy
      Committee, is reasonable and necessary or appropriate to qualify or
      continue the qualification of the Partnership as a limited partnership or
      a partnership in which the limited partners have limited liability under
      the laws of any state or that is necessary or advisable in the opinion of
      the Partnership Policy Committee to ensure that neither the Partnership
      nor Northern Border Pipeline will be treated as an association taxable as
      a corporation or otherwise taxed as an entity for federal income tax
      purposes;

            (d) a change (i) that, in the sole discretion of the Partnership
      Policy Committee, does not adversely affect the Limited Partners in any
      material respect, (ii) that is necessary or desirable to satisfy any
      requirements, conditions or guidelines contained in any opinion,
      directive, order, ruling or regulation of any federal or state agency or
      judicial authority or contained in any federal or state statute
      (including, without limitation, the Delaware Act), compliance with any of
      which the Partnership Policy Committee determines in its sole discretion
      to be in the best interests of the Partnership and the Limited Partners or
      (iii) that is required to effect the intent of the provisions of this
      Agreement or is otherwise contemplated by this Agreement;

            (e) an amendment that is necessary, in the Opinion of Counsel, to
      prevent the Partnership or the General Partners or their directors or
      officers from in any manner being subjected to the provisions of the
      Investment Company Act of 1940, as amended, the Investment Advisers Act of
      1940, as amended, or "plan asset" regulations adopted under the Employee
      Retirement Income Security Act of 1974, as amended, whether or not
      substantially similar to plan asset regulations currently applied or
      proposed by the United States Department of Labor;

            (f) any amendment expressly permitted in this Agreement to be made
      by the Partnership Policy Committee acting alone;

            (g) an amendment effected, necessitated or contemplated by a Merger
      Agreement approved in accordance with Section 15.3; or

            (h) any other amendments substantially similar to the foregoing.

      14.2 AMENDMENT PROCEDURES. Except with respect to amendments of the type
described in Section 14.1, all amendments to this Agreement shall be made in
accordance with the following requirements. Amendments to this Agreement may be
proposed only by or with the consent of the Partnership Policy Committee. Each
such proposal shall contain the text of the proposed amendment. A proposed
amendment shall be effective upon its approval by the Limited Partners.

                                   ARTICLE XV
                                     MERGER

      15.1 AUTHORITY. The Partnership may merge or consolidate with one or more
corporations, business trusts or associations, real estate investment trusts,
common law trusts or unincorporated businesses, including, without limitation, a
general partnership or limited partnership, formed under

                                       46

<PAGE>

the laws of the State of Delaware or any other state of the United States of
America, pursuant to a written agreement of merger or consolidation ("MERGER
AGREEMENT") in accordance with this Article.

        15.2 PROCEDURE FOR MERGER OR CONSOLIDATION. Merger or consolidation
of the Partnership pursuant to this Article requires the prior approval of the
Partnership Policy Committee. If the Partnership Policy Committee shall
determine, in the exercise of its sole discretion, to consent to the merger or
consolidation, the Partnership Policy Committee shall approve the Merger
Agreement, which shall set forth:

            (a) The names and jurisdictions of formation or organization of each
      of the business entities proposing to merge or consolidate;

            (b) The name and jurisdictions of formation or organization of the
      business entity that is to survive the proposed merger or consolidation
      (the "SURVIVING BUSINESS ENTITY");

            (c) The terms and conditions of the proposed merger or
      consolidation;

            (d) The manner and basis of exchanging or converting the equity
      securities of each constituent business entity for, or into, cash,
      property or general or limited partnership interests, rights, securities
      or obligations of the Surviving Business Entity; and (i) if any general or
      limited partnership interests, securities or rights of any constituent
      business entity are not to be exchanged or converted solely for, or into,
      cash, property or general or limited partnership interests, rights,
      securities or obligations of the Surviving Business Entity, the cash,
      property or general or limited partnership interests, rights, securities
      or obligations of any limited partnership, corporation, trust or other
      entity (other than the Surviving Business Entity) which the holders of
      such general or limited partnership interest are to receive in exchange
      for, or upon conversion of, their securities or rights, and (ii) in the
      case of securities represented by certificates, upon the surrender of such
      certificates, which cash, property or general or limited partnership
      interests, rights, securities or obligations of the Surviving Business
      Entity or any limited partnership, corporation, trust or other entity
      (other than the Surviving Business Entity), or evidences thereof, are to
      be delivered;

            (e) A statement of any changes in the constituent documents or the
      adoption of new constituent documents (the articles or certificate of
      incorporation, articles of trust, declaration of trust, certificate or
      agreement of limited partnership or other similar charter or governing
      document) of the Surviving Business Entity to be effected by such merger
      or consolidation;

            (f) The effective time of the merger, which may be the date of the
      filing of the certificate of merger pursuant to Section 15.4 or a later
      date specified in or determinable in accordance with the Merger Agreement
      (provided, that if the effective time of the merger is to be later than
      the date of the filing of the certificate of merger, the effective time
      shall be fixed no later than the time of the filing of the certificate of
      merger and stated therein); and

            (g) Such other provisions with respect to the proposed merger or
      consolidation as are deemed necessary or appropriate by the Partnership
      Policy Committee.

      15.3 APPROVAL BY LIMITED PARTNERS OF MERGER OR CONSOLIDATION. (a) The
Partnership Policy Committee of the Partnership, upon its approval of the Merger
Agreement, shall direct that the Merger Agreement be submitted to the Limited
Partners for their approval.

                                       47

<PAGE>

      (b) The Merger Agreement shall be approved upon receiving the approval of
the Limited Partners.

      (c) After such approval by vote or consent of the Limited Partners, and at
any time prior to the filing of the certificate of merger pursuant to Section
15.4, the merger or consolidation may be abandoned pursuant to provisions
therefor, if any, set forth in the Merger Agreement.

      15.4 CERTIFICATE OF MERGER. Upon the required approval by the Partnership
Policy Committee and the Limited Partners of a Merger Agreement, a certificate
of merger shall be executed and filed with the Secretary of State of the State
of Delaware in conformity with the requirements of the Delaware Act.

      15.5 EFFECT OF MERGER. (a) At the effective time of the certificate of
merger:

            (i) all of the rights, privileges and powers of each of the business
      entities that has merged or consolidated, and all property, real, personal
      and mixed, and all debts due to any of those business entities and all
      other things and causes of action belonging to each of those business
      entities shall be vested in the Surviving Business Entity and after the
      merger or consolidation shall be the property of the Surviving Business
      Entity to the extent they were of each constituent business entity;

            (ii) the title to any real property vested by deed or otherwise in
      any of those constituent business entities shall not revert and is not in
      any way impaired because of the merger or consolidation;

            (iii) all rights of creditors and all liens on or security interest
      in property of any of those constituent business entities shall be
      preserved unimpaired; and

            (iv) all debts, liabilities and duties of those constituent business
      entities shall attach to the Surviving Business Entity, and may be
      enforced against it to the same extent as if the debts, liabilities and
      duties had been incurred or contracted by it.

      (b) A merger or consolidation effected pursuant to this Article shall not
be deemed to result in a transfer or assignment of assets or liabilities from
one entity to another having occurred.

                                   ARTICLE XVI
                               GENERAL PROVISIONS

      16.1 ADDRESSES AND NOTICES. Any notice, demand, request, report or proxy
materials required or permitted to be given or made to a Partner under this
Agreement shall be in writing and shall be deemed given or made when delivered
in person or when sent by first-class United States mail or by other means of
written communication to such Partner at the address of such Partner as shown on
the records of the Partnership. Any notice to the Partnership or the Partnership
Policy Committee shall be deemed given if received by the Chairman of the
Partnership Policy Committee at the principal office of the Partnership
designated pursuant to Section 1.3. The General Partners and the Partnership
Policy Committee may rely and shall be protected in relying on any notice or
other document from a Partner or other Person if believed by it to be genuine.

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<PAGE>

      16.2 REFERENCES. Except as specifically provided otherwise, references to
"Articles" and "Sections" are to Articles and Sections of this Agreement.

      16.3 PRONOUNS AND PLURALS. Whenever the context may require, any pronoun
used in this Agreement shall include the corresponding masculine, feminine or
neuter forms, and the singular form of nouns, pronouns and verbs shall include
the plural and vice versa.

      16.4 FURTHER ACTION. The parties shall execute and deliver all documents,
provide all information and take or refrain from taking action as may be
necessary or appropriate to achieve the purposes of this Agreement.

      16.5 BINDING EFFECT. This Agreement shall be binding upon and inure to the
benefit of the parties hereto and their heirs, executors, administrators,
successors, legal representatives and permitted assigns.

      16.6 INTEGRATION. This Agreement constitutes the entire agreement among
the parties hereto pertaining to the subject matter hereof and supersedes all
prior agreements and understandings pertaining thereto.

      16.7 CREDITORS. None of the provisions of this Agreement shall be for the
benefit of, or shall be enforceable by, any creditor of the Partnership.

      16.8 WAIVER. No failure by any party to insist upon the strict performance
of any covenant, duty, agreement or condition of this Agreement or to exercise
any right or remedy consequent upon a breach thereof shall constitute waiver of
any such breach or any other covenant, duty, agreement or condition.

      16.9 COUNTERPARTS. This Agreement may be executed in counterparts, all of
which together shall constitute an agreement binding on all the parties hereto,
notwithstanding that all such parties are not signatories to the original or the
same counterpart. Each party shall become bound by this Agreement immediately
upon affixing its signature hereto, independently of the signature of any other
party.

      16.10 APPLICABLE LAW. This Agreement shall be construed in accordance with
and governed by the laws of the State of Delaware, without regard to the
principles of conflicts of law.

      16.11 INVALIDITY OF PROVISIONS. If any provision of this Agreement is or
becomes invalid, illegal or unenforceable in any respect, the validity, legality
and enforceability of the remaining provisions contained herein shall not be
affected thereby.

                                       49

<PAGE>

      IN WITNESS WHEREOF, the parties hereto have executed this Agreement as of
the date first written above.

                                       GENERAL PARTNERS:

                                            NORTHERN PLAINS NATURAL GAS COMPANY

                                            By: /s/ Larry L. DeRoin
                                                --------------------------------
                                            Name:
                                                  ------------------------------
                                            Title:
                                                   -----------------------------

                                            NORTHWEST BORDER PIPELINE COMPANY

                                            By: /s/ G.L. Best
                                                -------------------
                                            Name: G.L. Best
                                            Title: Vice Pres.

                                            PAN BORDER GAS COMPANY

                                            By: /s/ J.D. Thomas
                                                -------------------
                                            Name: J.D. Thomas
                                            Title: Treasurer

                                       INITIAL LIMITED PARTNERS:

                                            NORTHERN PLAINS NATURAL GAS COMPANY

                                            By: /s/ Larry L. DeRoin
                                                --------------------------------
                                            Name:
                                                  ------------------------------
                                            Title:
                                                   -----------------------------

                                            NORTHWEST BORDER PIPELINE COMPANY

                                            By: /s/ G.L. Best
                                                --------------------------------
                                            Name: G.L. Best
                                            Title: Vice Pres.

                                       50

<PAGE>

                                            PAN BORDER GAS COMPANY

                                            By: /s/ J. D. Thomas
                                                --------------------------------
                                            Name: J. D. Thomas
                                            Title: Treasurer

                                       ORGANIZATIONAL LIMITED PARTNER:

                                            NORTHWEST BORDER PIPELINE COMPANY

                                            By: /s/ G. L. Best
                                                --------------------------------
                                            Name: G. L. Best
                                            Title: Vice President

                                       INITIAL SUBSTITUTED LIMITED PARTNER:

                                            NORTHERN BORDER PARTNERS, L.P.

                                            By: /s/ Larry L. DeRoin
                                                --------------------------------
                                            Larry L. DeRoin
                                            Chief Executive Officer

                                       51