Document:

Exhibit 4.2

                                                               Execution Version

                          SECOND SUPPLEMENTAL INDENTURE

                           Dated as of August 13, 2002

                                     between

                     IROQUOIS GAS TRANSMISSION SYSTEM, L.P.

                                       and

                               JPMORGAN CHASE BANK
                  (formerly known as The Chase Manhattan Bank),

                as Trustee, Paying Agent, Security Registrar and

                                 Transfer Agent

                           6.10% Senior Notes Due 2027

<PAGE>

         SECOND SUPPLEMENTAL INDENTURE, dated as of August 13, 2002 (this
"Second Supplemental Indenture"), between IROQUOIS GAS TRANSMISSION SYSTEM,
L.P., a limited partnership organized under the laws of the State of Delaware,
as issuer (the "Issuer") and JPMORGAN CHASE BANK (formerly known as THE CHASE
MANHATTAN BANK), as Trustee, Paying Agent, Security Registrar and Transfer Agent
under the Original Indenture referred to below (the "Trustee").

                                   WITNESSETH:

         WHEREAS, the Issuer has heretofore executed and delivered to the
Trustee an indenture dated as of May 30, 2000 (hereinafter called the "Original
Indenture", and together with this Second Supplemental Indenture, the
"Indenture") to provide for the issuance from time to time of certain of its
debt securities;

         WHEREAS, Section 9.1 of the Original Indenture provides, among other
things, that the Issuer and the Trustee may enter into indentures supplemental
to the Original Indenture without the consent of any Holders, among other
things, (i) for the purpose of establishing the form and terms of any series of
its debt securities as permitted by Section 2.1 of the Original Indenture and/or
(ii) to add to, change or eliminate any provision of the Original Indenture
subject to compliance with the requirements of Section 9.1(j) thereof;

         WHEREAS the Issuer desires to create, pursuant to Section 2.1 of the
Original Indenture, a series of debt securities in an aggregate principal amount
of $170,000,000 to be designated the "6.10% Senior Notes Due 2027" (such debt
securities, as issued on August 13, 2002, the "Notes", which shall constitute
"Notes" for the purposes of the Original Indenture and this Second Supplemental
Indenture but the use of the term "Notes" in this Second Supplemental Indenture
shall (except as otherwise expressly provided in the Original Indenture or
herein or unless the context otherwise requires) refer only to the Notes issued
pursuant to this Second Supplemental Indenture), and all actions on the part of
the Issuer necessary to authorize the issuance of the Notes under the Original
Indenture and this Second Supplemental Indenture have been duly taken; and

         WHEREAS, all acts and things necessary to make such Notes, when
executed by the Issuer and authenticated and delivered by the Trustee as
provided in the Original Indenture, the valid and binding obligations of the
Issuer and to constitute these presents a valid and binding supplemental
indenture and agreement according to its terms, have been duly done and
performed.

<PAGE>

         NOW, THEREFORE, THIS SECOND SUPPLEMENTAL INDENTURE WITNESSETH:

         That in consideration of the premises and of the acceptance and
purchase of the Notes by the holders thereof and of the acceptance of this trust
by the Trustee, the Issuer covenants and agrees with the Trustee, for the equal
benefit of holders of the Notes, as follows:

                                  Article One
                                   Definitions

         The use of the terms and expressions herein is in accordance with the
definitions, uses and constructions contained in the Original Indenture and the
form of the Note attached hereto as Exhibit A. The terms used in this Second
Supplemental Indenture, or the Original Indenture as they relate to the Notes,
which are not defined in the Original Indenture or this Second Supplemental
Indenture but which are defined in the Trust Indenture Act, or which are by
reference in the Trust Indenture Act defined in the Securities Act (except as
otherwise expressly provided in the Indenture or unless the context otherwise
requires), shall have the meanings assigned to such terms under the Trust
Indenture Act and in the Securities Act as in force at the date of the execution
of this Second Supplemental Indenture. In addition, for all purposes of this
Second Supplemental Indenture, except as otherwise expressly provided or unless
the context otherwise expressly requires, the following terms shall have the
respective meanings assigned to them as follows and shall be construed as if
defined in Article One of the Original Indenture:

         "Athens Expansion" means the addition of compression capacity and
facilities by the Issuer to service the 1,080 MW Athens Power Station in Athens,
New York.

         "DTC" means The Depository Trust Company, New York, New York, or its
successors.

         "Eastchester Extension" means (i) the addition of compression capacity
and gas cooling facilities by the Issuer at multiple new and existing
compression station facilities located in New York along the Pipeline and (ii) a
pipeline of the Issuer from Northport, Long Island westward through the Long
Island Sound and East River to the Hunts Point section of New York City.

         "First Supplemental Indenture" mean that First Supplemental Indenture
dated as of May 30, 2000 executed and delivered by the Issuer and the Trustee.

         "Regulation S" means Regulation S under the Securities Act, as such
Regulation may be amended from time to time, or under any similar rules or
regulations hereafter adopted by the SEC.

         "Restricted Notes Legend" means a legend substantially in the form of
the legend identified as such and contained in the form of Notes set forth in
Exhibit A hereto.

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<PAGE>

         "Transfer Certificate" means a certificate of transfer satisfactory to
the Issuer and the Trustee (as Security Registrar) substantially in the form of
Exhibit B hereto.

                                  Article Two
                         Terms and Issuance of the Notes

Section 2.1. Issue of Notes.

         Each of the Notes shall be executed, authenticated and delivered in
accordance with the provisions of, and shall in all respects be subject to, the
terms, conditions and covenants of the Original Indenture and this Second
Supplemental Indenture (including the form of Note set forth in Exhibit A
attached hereto). The aggregate principal amount of the Notes which may be
authenticated and delivered under this Second Supplemental Indenture shall not
exceed $170,000,000.

Section 2.2. Interest; Principal; Record Date.

         Interest on the Notes will be payable semi-annually on April 30 and
October 31 in each year, commencing April 30, 2003, at a rate of 6.10% per
annum, until the principal thereof is paid or made available for payment.

         Principal on the Notes will be payable semi-annually on April 30 and
October 31 in each year, commencing April 30, 2008, in accordance with the
amortization schedule attached to this Second Supplemental Indenture as Exhibit
C and to each Note.

         The interest and principal so payable, and punctually paid or duly
provided for, on any Debt Service Payment Date will be paid to the Person in
whose name the Notes (or one or more Predecessor Notes) are registered at the
close of business on the Regular Record Date for such principal and interest,
which shall be the fifteenth day (whether or not a Business Day) preceding such
Debt Service Payment Date.

         Any such interest or principal not so punctually paid or duly provided
for will forthwith cease to be payable to the Person in whose name the Notes are
registered on the Regular Record Date and may be paid to the Person in whose
name such Notes (or one or more Predecessor Notes) are registered at the close
of business on the Special Record Date to be fixed by the Issuer, notice whereof
shall be given to the Holders of the Notes not less than 10 days prior to such
Special Record Date, or may be paid at any time in any other lawful manner not
inconsistent with the requirements of any securities exchange on which the Notes
may be listed and upon such notice as may be required by such exchange on which
the Notes may be listed, and upon such notice as may be required by such
exchange, all as more fully provided in the Original Indenture. The Notes do not
have the benefit of any sinking fund, but the principal amount thereof shall
amortize as set forth above and in each Note.

                                       3
<PAGE>

Section 2.3. Place of Payment.

         The principal of, the premium, if any, and interest on the Notes will
be payable at the offices of the Trustee at: 450 West 33rd Street, New York, New
York 10001, Attention: Institutional Trust Services (the "Place of Payment").

         The Notes may be surrendered for registration of transfer and exchange
at the Place of Payment. Upon receiving the Notes surrendered for registration
of transfer or exchange, the Issuer will issue new Notes which will be sent to
the Trustee for authentication and delivery as set forth in Section 2.5 of this
Second Supplemental Indenture. Notices and demands to or upon the Issuer in
respect of the Notes may be served at the Place of Payment.

Section 2.4. Form of the Notes; Incorporation of Terms.

         The Notes offered and sold in their initial distribution in reliance on
Rule 144A shall initially be issued in the form of one or more separate Global
Notes (each, a "Rule 144A Global Note"), the face and reverse of which shall be
substantially in the form set forth in Exhibit A attached hereto, the terms of
which are herein incorporated by reference and which are part of this Second
Supplemental Indenture. The Notes offered and sold in their initial distribution
in reliance on Regulation S shall initially be issued in the form of one or more
separate Global Notes (each, a "Regulation S Global Note", and together with all
Rule 144A Global Notes, the "Global Notes"), the face and reverse of which shall
be substantially in the form set forth in Exhibit A attached hereto. Definitive
Notes registered in the name or names of Persons other than the Depositary or
its nominee shall only be issued in exchange for any Global Note in the
circumstances set forth in Section 2.4(b)(ii) of the Original Indenture and
shall be substantially in the form set forth in Exhibit A attached hereto.

Section 2.5. Transfer Restrictions; Exchange of Notes.

         The Notes, as originally issued under this Second Supplemental
Indenture, are restricted and may not be transferred except in compliance with
the Restricted Notes Legend. The Notes shall bear the Restricted Notes Legend
until such time as such Restricted Notes Legend shall be removed by the Issuer
(i) in the case of any Note issued pursuant to Rule 144A, at any time on or
after the occurrence of the "Resale Restriction Termination Date" on such Legend
and (ii) in the case of any Note issued pursuant to Regulation S at any time on
or after the expiration of the "restricted period" (within the meaning of
Regulation S) with respect to any such Note. The Issuer shall notify the Trustee
of the expiration date of the "restricted period".

         (a) Exchanges between Regulation S Global Note and Rule 144A Global
Note.

         If a holder of a beneficial interest in a Rule 144A Global Note wishes
at any time to transfer such interest to a Person who wishes to take delivery
thereof in the form of a beneficial interest in a Regulation S Global Note, or
if a holder of a beneficial interest in a Regulation S Global Note wishes at any
time to transfer such interest to a

                                       4
<PAGE>

Person who wishes to take delivery thereof in the form of a beneficial interest
in a Rule 144A Global Note, upon receipt by the Trustee (as Security Registrar)
at its Corporate Trust Office of a Transfer Certificate in the appropriate form
and:

          (i) written instructions given in accordance with the rules and
     procedures of the Depositary (together with, as applicable, the rules and
     procedures of Euroclear Bank S.A./N.V. ("Euroclear") and Clearstream
     Banking, societe anonyme ("Clearstream, Luxembourg"), the "Applicable
     Procedures") from the respective Person who has an account with the
     Depositary (each such Person, a "Participant") directing the Depositary to
     cause to be credited to the account of another Participant a beneficial
     interest in such Regulation S Global Note or Rule 144A Global Note (as the
     case may be) equal to that of the beneficial interest in such Rule 144A
     Global Note or Regulation S Global Note (as the case may be) to be so
     transferred; and

          (ii) written instructions given in accordance with the Applicable
     Procedures containing information regarding such other account, as well as
     the account of Euroclear or Clearstream, Luxembourg (as the case may be)
     for which such other account is held, to be credited with, and the account
     of such applicable Participant to be debited for, such beneficial interest;

the Trustee shall (1) reduce or increase (as the case may be) the principal
amount of such Rule 144A Global Note, and increase or reduce (as the case may
be) the principal amount of such Regulation S Global Note, in each case by an
amount equal to the principal amount of the beneficial interest in such Rule
144A Global Note or Regulation S Global Note (as the case may be) to be so
transferred, (2) instruct the Depositary to make a corresponding reduction or
increase (as the case may be) to the book-entry interests relating to such
Global Note and to credit and debit such beneficial interests to the respective
accounts specified in the instructions referred to above.

         (b) Exchanging Restricted Definitive Notes for Regulation S Global Note
or Rule 144A Global Note.

         If a holder of a Definitive Note bearing the Restricted Note Legend
(the "Restricted Definitive Note") wishes to exchange all or part of such
Definitive Note for a beneficial interest in a Regulation S Global Note or a
beneficial interest in a Rule 144A Global Note or wishes to transfer all or part
of such Restricted Definitive Note to a person who wishes to take delivery
thereof in the form of a beneficial interest in a Regulation S Global Note or a
Rule 144A Global Note, upon receipt by the Trustee (as Security Registrar) at
its Corporate Trust Office of a Transfer Certificate in the appropriate form
and:

          (i) the Restricted Definitive Note to be so exchanged or transferred;
     and

          (ii) written instructions given in accordance with the rules and
     procedures of the Depositary and the Applicable Procedures from the
     applicable

                                       5
<PAGE>

     Participant directing the Trustee to cancel such Restricted Definitive Note
     (or part thereof being transferred, so long as the part not being
     transferred is in the principal amount of authorized denominations of such
     Restrictive Definitive Note, in which case the Trustee shall issue a new
     Restricted Definitive Note to the original Holder in the aggregate original
     principal of the original Restricted Definitive Note not being so
     transferred) and for the Depositary to cause to be credited to the
     specified account of the applicable Participant a beneficial interest in
     such Regulation S Global Note or Rule 144A Global Note (as the case may be)
     equal to the principal amount of the Restricted Definitive Note so
     exchanged or transferred;

the Trustee shall (1) cancel such Restricted Definitive Note (or part thereof
being transferred, so long as the part not being transferred is in the principal
amount of authorized denominations of such Restrictive Definitive Note, in which
case the Trustee shall issue a new Restricted Definitive Note to the original
Holder in the aggregate original principal of the original Restricted Definitive
Note not being so transferred) and (2) instruct the Depositary to make a
corresponding increase to the book-entry interests relating to such Regulation S
Global Note or Rule 144A Global Note (as the case may be) and to credit such
beneficial interests to the respective accounts specified in the instructions
referred to above.

         (c) Exchange of Regulation S Global Note or Rule 144A Global Note for
Definitive Notes.

         Subject to compliance with Section 2.4(b)(ii) of the Original Indenture
(other than clause (C) of such Section 2.4(b)(ii), which clause (C) shall not be
applicable to the Notes), if a holder of a beneficial interest in a Regulation S
Global Note or a Rule 144A Global Note is required to exchange such interest for
one or more Restricted Definitive Notes or to transfer such interest to a person
who is required to take delivery thereof in the form of one or more Restricted
Definitive Notes, upon receipt by the Trustee (as Security Registrar) at its
Corporate Trust Office of a Transfer Certificate in the appropriate form and:

          (i) written instructions given in accordance with the rules and
     procedures of the Depositary and the Applicable Procedures from the
     applicable Participant directing the Trustee to authenticate and deliver
     such Definitive Note or Notes in an aggregate principal equal to that of
     the beneficial interest in the Regulation S Global Note or Rule 144A Global
     Note (as the case may be) to be debited and for the Depositary to cause to
     be debited to the specified account of the applicable Participant a
     beneficial interest in such Regulation S Global Note or Rule 144A Global
     Note (as the case may be) equal to the principal amount of the Restricted
     Definitive Note so exchanged or transferred; such information to contain
     the name in which such Restricted Definitive Note or Notes are to be
     registered and the authorized denomination of each such Restricted
     Definitive Note or Notes; and

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<PAGE>

          (ii) one or more Restricted Definitive Notes issued and duly executed
     by the Issuer;

the Trustee shall (1) instruct the Depositary to make a corresponding reduction
to the book-entry interests relating to such Regulation S Global Note or Rule
144A Global Note (as the case may be) and to debit such beneficial interests to
the respective accounts as specified in the written instructions and (2) shall
thereupon promptly authenticate and deliver at the Corporate Trust Office (as
the office of the Security Registrar), or send by mail (at the risk of the
transferee) to such address as the transferee may request, the Restrictive
Definitive Note or Notes, registered in the requested name as specified in the
written instructions.

         (d) Exchange of Restricted Definitive Notes for other Restricted
Definitive Notes.

         A Restricted Definitive Note may be exchanged or transferred in whole
or in part in the principal amount of authorized denominations of such
Restricted Definitive Note, upon receipt by the Trustee (as Security Registrar)
at its Corporate Trust Office of: (i) in the case of an exchange, a written
request for exchange, (ii) a Transfer Certificate in the appropriate form, and
(iii) a new Restricted Definitive Note issued and duly executed by the Issuer.
In exchange for any Restricted Definitive Note properly presented for exchange
or transfer, the Trustee shall promptly authenticate and deliver at the
Corporate Trust Office (as the office of the Security Registrar), or send by
mail (at the risk of the holder (in the case of exchanges only) or transferee)
to such address as the holder (in the case of exchanges only) or transferee may
request another Restricted Definitive Note or Notes, registered in the name of
such holder or transferee, for the same aggregate principal amount that was
exchanged or transferred.

                                 Article Three
                      Amendments to the Original Indenture

Section 3.1. Amendments to the Original Indenture.

         The Issuer covenants and agrees for the benefit of the Holders of the
Notes only that, for so long as any Note is Outstanding under this Second
Supplemental Indenture, it shall observe the following modifications to certain
definitions and affirmative covenants contained in the Original Indenture, but
only with respect to the Notes:

         (a) Definitions.

         For the avoidance of doubt, the phrase "... and any future expansions
or extensions of these facilities" in the definition of "Pipeline" in Section
1.1 of the Original Indenture shall include the Eastchester Extension and the
Athens Expansion.

                                       7
<PAGE>

         (b) Financial Statements and Other Information.

         The reference to "90 days," in Section 6.1(d)(i) and 6.1(f) of the
Original Indenture, and to "45 days" in Section 6.1(d)(ii) of the Original
Indenture shall be references to such shorter period or fewer number of days as
is mandated by law or by the SEC by rulemaking or regulation, or otherwise as
the time period by which Exchange Act reporting issuers are required to file
their annual report and quarterly reports, respectively, pursuant to Section
13(a) or 15(d) of the Exchange Act. The Issuer shall promptly notify the Trustee
of any change in its reporting requirements resulting from the operation of this
clause (b). The Issuer shall provide copies of the reports and other information
required to be delivered to the Trustee pursuant to Section 6.1(d) and 6.1(f) of
the Original Indenture to any beneficial holder of Notes that so requests of the
Issuer.

         (c) Maintenance of Insurance.

         Section 6.1(i) of the Original Indenture is hereby deleted in its
entirety and is hereby replaced with the following:

               (i) Maintenance of Insurance. The Issuer shall provide or cause
          to be provided, for itself and its Subsidiaries, insurance (including
          appropriate self-insurance) against loss or damage of the kinds
          customarily insured against by companies similarly situated in the
          industry in which the Issuer or the Subsidiaries are then conducting
          business and owning like properties, including, but not limited to,
          products liability insurance and public liability insurance, with
          reputable insurers or with the government of the United States of
          America, or an agency or instrumentality thereof, in such amounts,
          with such deductibles and by such methods as shall be customary for
          companies similarly situated in the industry in which the Issuer or
          the Subsidiaries are then conducting business and owning like
          properties.

         (d) SEC Reports and Reports to Holders.

         Section 6.1(j) of the Original Indenture is hereby deleted in its
entirety and is hereby replaced with the following:

               (j) SEC Reports and Reports to Holders. The Issuer shall continue
          to file with the SEC all such reports and other information that the
          Issuer is required to file with the SEC by Section 13(a) or 15(d)
          under the Exchange Act as a United States issuer. For so long as the
          Issuer is required to file such reports and/or other information with
          the SEC, the Issuer shall supply to the Trustee and each Holder of the
          Notes (including each beneficial holder of the Notes so requesting) or
          shall supply to the Trustee for forwarding to each such Holder or
          beneficial holder together with written directions to forward such
          reports and/or other information to such Holder or beneficial holder,
          without cost to such Holder (including any such beneficial holder),
          copies of such reports and/or other

                                       8
<PAGE>

          information. If at any time the Issuer is not required to file such
          reports and/or other information with the SEC and for so long as any
          Note remains Outstanding, the Issuer shall nonetheless continue to
          supply to the Trustee and each Holder of such Notes (including each
          beneficial holder of the Notes so requesting) or shall supply to the
          Trustee for forwarding to each such Holder or beneficial holder
          together with written directions to forward such reports and/or other
          information to such Holder or beneficial holder, without cost to such
          Holder (including any such beneficial holder), reports and/or other
          information that are substantially similar to the reports and/or other
          information that the Issuer otherwise would have been required to file
          with the SEC under Section 13(a) or 15(d) of the Exchange Act as a
          United States issuer within the time specified by the Exchange Act.

                                  Article Four
                                   Depositary

Section 4.1. Depositary.

         DTC or its nominee will be the Depositary.

         The Global Notes may not be transferred except by the Depositary to a
nominee of the Depositary or by a nominee of the Depositary to the Depositary or
another nominee of the Depositary or to a successor Depositary or a nominee of a
successor Depositary.

                                  Article Five
                                 Miscellaneous

Section 5.1. Execution of Supplemental Indenture.

         This Second Supplemental Indenture is executed and shall be construed
as an indenture supplemental to the Original Indenture and, as provided in the
Original Indenture, this Second Supplemental Indenture forms a part thereof. The
Notes executed, authenticated and delivered under this Second Supplemental
Indenture constitute a series and shall not be considered to be a part of the
series executed, authenticated and delivered under the First Supplemental
Indenture or any other supplemental indenture entered into pursuant to the
Original Indenture.

Section 5.2. Conflict with Trust Indenture Act.

         If any provision hereof limits, qualifies or conflicts with another
provision hereof which is required to be included in this Second Supplemental
Indenture, or would be required to be included in this Second Supplemental
Indenture if the Trust Indenture Act applied to this Second Supplemental
Indenture, by any of the provisions of the Trust Indenture Act, such provision
of the Trust Indenture Act shall control.

                                       9
<PAGE>

Section 5.3. Effect of Headings.

         The Article and Section headings herein are for convenience only and
shall not affect the construction hereof.

Section 5.4. Successors and Assigns.

         All covenants and agreements in this Second Supplemental Indenture by
the Issuer shall bind its successors and assigns, whether so expressed or not.

Section 5.5. Severability Clause.

         In case any provision in this Second Supplemental Indenture or in the
Notes shall be invalid, illegal or unenforceable, the validity, legality and
enforceability of the remaining provisions shall not in any way be affected or
impaired thereby.

Section 5.6. Benefit of Second Supplemental Indenture.

         Nothing in this Second Supplemental Indenture or in the Notes, express
or implied, shall give to any person, other than the parties hereto and their
successors hereunder and the Holders of the Notes, any benefit or any legal or
equitable right, remedy or claim under this Second Supplemental Indenture.

Section 5.7. Execution and Counterparts.

         This Second Supplemental Indenture may be executed in any number of
counterparts, each of which shall be deemed to be an original, but all such
counterparts shall together constitute but one and the same instrument.

Section 5.8. Original Indenture.

         Other than as modified, amended or supplemented pursuant to the terms
of this Second Supplemental Indenture, with respect to the Notes, the Original
Indenture shall remain in full force and effect in accordance with its terms as
it relates to all Outstanding Notes, including the Notes.

Section 5.9. GOVERNING LAW.

         THIS INDENTURE AND THE NOTES SHALL BE GOVERNED BY THE LAWS OF THE STATE
OF NEW YORK.

Section 5.10. Recitals, etc.

         The recitals contained in this Second Supplemental Indenture shall be
taken as the statements of the Issuer, and the Trustee assumes no responsibility
for their correctness and makes no representations as to the validity or
sufficiency of this Second Supplemental Indenture.

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<PAGE>

         IN WITNESS WHEREOF, the parties hereof have caused this Second
Supplemental Indenture to be duly executed by their respective officers,
directors or signatories duly authorized thereto, all as of the day and year
first above written.

                                   IROQUOIS GAS TRANSMISSION
                                      SYSTEM, L.P., as the Issuer

                                   By: Iroquois Pipeline Operating Company,
                                       as Agent of the Issuer

                                   By:   /s/ Craig R. Frew
                                      ------------------------------------------
                                      Name:     Craig R. Frew
                                      Title:    President

                                   By:   /s/ Paul Bailey
                                      ------------------------------------------
                                      Name:     Paul Bailey
                                      Title:    Vice President and Chief
                                                    Financial Officer

                                   JPMORGAN CHASE BANK,
                                   as Trustee, Paying Agent, Security Registrar
                                           and Transfer Agent

                                   By:   /s/ Denise S. Moore
                                      ------------------------------------------
                                       Title:     Assistant Vice President

                         [Second Supplemental Indenture]Exhibit 10.2

                                                                  Execution Copy

                       AMENDMENT NO. 1 TO CREDIT AGREEMENT

         AMENDMENT NO. 1 TO CREDIT AGREEMENT, dated as of July 30, 2002 (this
"Amendment"), among IROQUOIS GAS TRANSMISSION SYSTEM, L.P., a Delaware limited
partnership (the "Borrower"), the several banks and other financial institutions
from time to time party hereto and JPMorgan Chase Bank (formerly known as THE
CHASE MANHATTAN BANK), as Administrative Agent (in such capacity the
"Administrative Agent").

         A. Reference is made to that certain Credit Agreement, dated as of May
30, 2000, among the Borrower, the several banks and other financial institutions
from time to time party thereto (each, a "Lender" and, collectively, the
"Lenders"), Bank of Montreal, as Syndication Agent, Fleet National Bank, as
Documentation Agent, and the Administrative Agent (as the same has been or may
be further amended, supplemented or otherwise modified from time to time, the
"Credit Agreement"), pursuant to which the Lenders have extended and agreed to
extend credit to the Borrower on the terms and subject to the conditions set
forth therein.

         B. In connection with a capital markets debt issuance anticipated to be
launched in July, 2002, the Borrower intends to apply $142,222,220 of the
proceeds of such issuance to prepay (the "Total Tranche A Reduction Payment"),
on a pro rata basis, Term Loans outstanding under the Credit Agreement.

         C. The Borrower has requested that the Credit Agreement be amended on
the terms set forth herein to (a) make available to the Borrower for a
twelve-month period after payment of the Total Tranche A Reduction Payment a
second tranche of term loans in an aggregate amount equal to $120,000,000 and
(b) designate an earlier maturity date for all Term Loans.

         D. Accordingly, in consideration of the mutual agreements herein
contained and other good and valuable consideration, the sufficiency and receipt
of which are hereby acknowledged, the parties hereto hereby agree as follows:

            SECTION 1. Definitions. Unless otherwise specifically defined
herein, capitalized terms used herein shall have their respective meanings
assigned to such terms in the Credit Agreement.

            SECTION 2. Amendment. Subject to the effectiveness of this Amendment
in accordance with Section 5 hereof, the Credit Agreement is hereby amended as
follows:

     (a)    The fourth recital is deleted in its entirety and replaced with the
following:

            "The Borrower has requested the Lenders to extend credit in the form
            of (a) Tranche A Term Loans on the Closing Date, (b) Tranche B Term
            Loans during

<PAGE>

            the Tranche B Availability Period in an aggregate principal amount
            not to exceed $120,000,000 and (c) Revolving Credit Loans at any
            time and from time to time prior to the Revolving Credit Termination
            Date, in an aggregate principal amount at any time outstanding not
            in excess of $10,000,000."

     (b)    Section 1.1 is amended by deleting the definitions of "Commitment",
"Commitment Percentage", "Note", "Term Loan", "Term Loan Commitment", "Term Loan
Maturity Date" and "Total Term Loan Commitment", and by inserting the following
definitions to appear in alphabetical order:

                    "Amendment No. 1 to Credit Agreement" means Amendment No. 1
            to Credit Agreement, dated as of July 30, 2002 among the Borrower,
            the several banks and other financial institutions from time to time
            party thereto and JPMorgan Chase Bank (formerly known as The Chase
            Manhattan Bank), as administrative agent.

                    "Athens Expansion" means the addition of compression
            capacity and facilities to service the 1,080 MW Athens Power Station
            in Athens, New York.

                    "Capital Markets Issuance (2002)" means the series of debt
            securities in the aggregate principal amount of $170,000,000 to be
            issued pursuant to the Senior Indenture, as amended by the Second
            Series Supplemental Indenture, and the series of debt securities
            which may be issued pursuant to the Senior Indenture, as amended by
            the Second Series Supplemental Indenture, and registered with the
            Securities and Exchange Commission of the United States, or any
            successor agency, in exchange therefor.

                    "Commitment" means, as to any Lender, the collective
            reference to the Tranche A Term Loan Commitment, Tranche B Term Loan
            Commitment and the Revolving Credit Commitment of such Lender.

                    "Commitment Percentage" means, as to any Lender, at any
            time, a fraction (expressed as a percentage) the numerator of which
            is the sum of (A) such Lender's Revolving Credit Commitment (or
            after the Revolving Credit Termination Date, such Lender's Revolving
            Credit Loans), (B) such Lender's Tranche A Term Loan Commitment (or
            after the Closing Date, such Lender's Tranche A Term Loans) and (C)
            such Lender's Tranche B Term Loan Commitment (or after the expiry of
            the Tranche B Availability Period, such Lender's Tranche B Term
            Loans) and the denominator of which is the sum of (x) the aggregate
            amount of Revolving Credit Commitments of all Lenders (or after the
            Revolving Credit Termination Date, all Revolving Credit Loans), (y)
            the aggregate amount of Tranche A Term Loan Commitments of all
            Lenders (or after the Closing Date, the aggregate amount of Tranche
            A Term Loans of all Lenders) and (z) the aggregate amount of Tranche
            B Term Loan Commitments (or after the expiry of the Tranche B
            Availability Period, the aggregate amount of Tranche B Term Loans of
            all Lenders) in each case outstanding at such time.

                                       2

<PAGE>

                    "Eastchester Extension" means (i) the addition of
            compression capacity and gas cooling facilities at multiple new and
            existing compression station facilities located in New York along
            the Pipeline and (ii) a pipeline from Northport, Long Island
            westward through the Long Island Sound and East River to the Hunts
            Point section of New York City.

                    "Note" means a note in substantially the form of the Term
            Loan Promissory Note or the Revolving Credit Promissory Note
            attached hereto as Exhibit A-1 and Exhibit A-2 respectively.

                    "Paydown Amount" means $22,222,220.

                    "Second Series Supplemental Indenture" means the Second
            Supplemental Indenture, dated on or about August 13, 2002, between
            the Borrower, as issuer, and JPMorgan Chase Bank, as trustee.

                    "Term Loan" means, as the context requires, either a Tranche
            A Term Loan or a Tranche B Term Loan or, when referred to
            collectively as "Term Loans", any combination of Tranche A Term
            Loans or Tranche B Term Loans only or of Tranche A Term Loans and
            Tranche B Term Loans collectively.

                    "Term Loan Commitment" means, as the context requires as to
            any Lender, either the Tranche A Term Loan Commitment or the Tranche
            B Term Loan Commitment of such Lender or, when referred to
            collectively as the "Term Loan Commitments" as to any Lender, the
            Tranche A Term Loan Commitment and the Tranche B Term Loan
            Commitment of such Lender.

                    "Term Loan Maturity Date" means June 30, 2008, or if such
            date is not a Business Day, the immediately preceding Business Day.

                    "Total Term Loan Commitment" means the sum of Tranche A Term
            Loan Commitments and Tranche B Term Loan Commitments of all the
            Lenders.

                    "Total Tranche A Reduction Payment" means $142,222,220.

                    "Tranche A Reduction Date" means the date designated by the
            Borrower as the "Tranche A Reduction Date" in a notice delivered by
            the Borrower to the Administrative Agent in connection with a
            prepayment of Tranche A Term Loans in accordance with Section 2.9,
            such prepayment being in an amount equal to the Total Tranche A
            Reduction Payment; provided, however, that such notice shall have
            been provided, if at all, and the Tranche A Reduction Date shall
            have occurred, if at all, by September 30, 2002.

                    "Tranche A Term Loan" has the meaning set forth in Section
            2.1(a).

                    "Tranche A Term Loan Commitment" means, (i) in the case of
            each Lender that is a Lender on the date hereof, the amount set
            forth opposite such Lender's name on Schedule 2 as such Lender's
            "Tranche A Term Loan

                                       3

<PAGE>

            Commitment", as such amount is reduced or terminated in accordance
            with Section 2.7(d), and (ii) in the case of any Lender that becomes
            a Lender after the date hereof, the amount specified as such
            Lender's "Tranche A Term Loan Commitment" in the Commitment Transfer
            Supplement pursuant to which such Lender assumed a portion of the
            Total Term Loan Commitment, in each case as the same may be changed
            from time to time pursuant to the terms hereof.

                    "Tranche B Availability Period" means the period commencing
            on the Tranche A Reduction Date and ending on the earlier to occur
            of (a) the date twelve months thereafter (or, if such date is not a
            Business Day then on the Business Day immediately preceding such
            date) or (b) the date on which the 12th separate advance of Tranche
            B Term Loans are made pursuant to Section 2.1(b).

                    "Tranche B Term Loan" has the meaning set forth in Section
            2.1(b).

                    "Tranche B Term Loan Commitment" means, (i) in the case of
            each Lender that is a Lender as of the Tranche A Reduction Date, an
            amount equal to the pro rata prepayment made to such Lender in
            respect of such Lender's outstanding Tranche A Term Loans on the
            Tranche A Reduction Date minus the pro rata prepayment made to such
            Lender on the Tranche A Reduction Date in respect of the Paydown
            Amount, such amount being such Lender's "Tranche B Term Loan
            Commitment", as such amount is reduced or terminated in accordance
            with Section 2.7(e) or Section 2.8(b) and (ii) in the case of any
            Lender that becomes a Lender after the Tranche A Reduction Date, the
            amount specified as such Lender's "Tranche B Term Loan Commitment"
            in the Commitment Transfer Supplement pursuant to which such Lender
            assumed a "Tranche B Term Loan Commitment" portion of the Total Term
            Loan Commitment, in each case as the same may be changed from time
            to time pursuant to the terms hereof.

     (c)    Section 2.1(a) is hereby deleted and replaced with the following in
place thereof:

                    "(a) Subject to and upon the terms and conditions of this
            Agreement, each Lender having a Tranche A Term Loan Commitment
            severally agrees to make a loan or loans (each a "Tranche A Term
            Loan" and collectively, the "Tranche A Term Loans") to the Borrower,
            which Tranche A Term Loans (i) shall be made on the Closing Date,
            (ii) may be repaid in accordance with the terms hereof, but once
            repaid, may not be reborrowed, (iii) shall not exceed for any such
            Lender the Tranche A Term Loan Commitment of such Lender and (iv)
            shall not exceed, in the aggregate with respect to all Lenders,
            $200,000,000. On the Term Loan Maturity Date, all Tranche A Term
            Loans shall be repaid in full."

     (d)    Sections 2.1(b) and 2.1(c) are re-numbered as 2.1(c) and 2.1(d),
respectively, and the following is inserted after Section 2.1(a):

                    "(b) Subject to and upon the terms and conditions of this
            Agreement, each Lender having a Tranche B Term Loan Commitment
            severally agrees to make a loan or loans (each, a "Tranche B Term
            Loan" and collectively, the

                                       4

<PAGE>

            "Tranche B Term Loans") to the Borrower, which Tranche B Term Loans
            shall be made during the Tranche B Availability Period, in up to 12
            separate advances, on such dates and in such amounts as specified in
            a Borrowing Certificate delivered in accordance with Section 2.5;
            provided, however, that any such borrowing (i) shall be in an amount
            equal to $5,000,000 or a whole multiple of $1,000,000 in excess
            thereof, (ii) may be repaid in accordance with the terms hereof, but
            once repaid, may not be reborrowed, (iii) shall not exceed for any
            such Lender the Tranche B Term Loan Commitment of such Lender and
            (iv) shall not exceed in the aggregate with respect to all Lenders,
            $120,000,000. On the Term Loan Maturity Date, all Tranche B Term
            Loans shall be repaid in full."

     (e)    Section 2.4(b) is amended by deleting the words "whether such Loan
is a Term Loan" and inserting "whether such Loan is a Tranche A Term Loan, a
Tranche B Term Loan" in place thereof.

     (f)    Section 2.5 is amended by deleting the sentence "Such Borrowing
Certificate shall also identify such Loans as Term Loans, Swingline Loans or
Revolving Credit Loans" and inserting the following in place thereof:

            "Such Borrowing Certificate shall also identify such Loans as
            Tranche A Term Loans (or, if delivered on or after the Tranche A
            Reduction Date, Tranche B Term Loans), Swingline Loans or Revolving
            Credit Loans."

     (g)    Section 2.6 is amended by adding the following to the end thereof:

            "(d) The Borrower agrees to pay to the Administrative Agent, for the
            account of each Lender having a Tranche B Term Loan Commitment (in
            each case pro rata according to the respective Tranche B Term Loan
            Commitments of all such Lenders), a commitment fee on the unused
            portion of such Lenders' Tranche B Term Loan Commitments for the
            period from and including the Tranche A Reduction Date to the last
            Business Day of the Tranche B Availability Period. Such commitment
            fee shall computed for each day during such period at a rate per
            annum equal to the greater of (i) 0.375% or (ii) the percentage set
            forth in the definition of Applicable Margin under the caption
            "Facility Fee" for such day on the aggregate of unused Tranche B
            Term Loan Commitments in effect on such day. Each such commitment
            fee shall be payable quarterly in arrears on the last day of each of
            March, June, September, and December, commencing on the first of
            such dates to occur after the Tranche A Reduction Date and on the
            last Business Day of the Tranche B Availability Period."

      (h)   Section 2.7(d) is hereby deleted and replaced with the following in
place thereof:

            "(d) The Tranche A Term Loan Commitments of all Lenders shall
            terminate at 5:00 P.M. (New York time) on the Closing Date.

                                       5

<PAGE>

            (e) The Tranche B Term Loan Commitments of all Lenders shall
            terminate at 5:00 P.M. (New York time) on the last Business Day of
            the Tranche B Availability Period."

     (i)    Section 2.8(b) is amended by (w) deleting the words "thirty five",
(x) deleting the words "shall be automatically be decreased" in clause (i)
thereof and replacing them with the words "shall be automatically decreased",
(y) deleting the word "and" that appears immediately before clause (ii) and
inserting a comma in place thereof and (z) deleting the period at the end of the
paragraph and inserting the following in place thereof:

            "and (iii) to the extent that the aggregate principal amount of
            Tranche B Term Loans outstanding at 5:00 P.M. (New York time) on the
            last Business Day of the Tranche B Availability Period is less than
            $120,000,000, the Repayment Amounts shall be automatically be
            decreased, in inverse order of maturity, by the amount of such
            difference. The Administrative Agent shall apply each payment of a
            Repayment Amount first to the repayment of Tranche A Term Loans then
            outstanding until all Tranche A Term Loans are repaid in full and
            thereafter to the repayment of Tranche B Term Loans then
            outstanding, if any. To the extent that any portion of a Repayment
            Amount is required to be applied to Tranche B Term Loans during the
            Tranche B Availability Period and no Tranche B Term Loans are then
            outstanding, such portion of the Repayment Amount shall instead
            reduce the Tranche B Term Loan Commitment, pro rata, among the
            Lenders."

     (j)    Section 2.9 is amended by adding the following sentence to the end
thereof:

            "In connection with any notice of prepayment of Term Loans provided
            in accordance with this Section 2.9, if the Borrower designates the
            date of such prepayment as the "Tranche A Reduction Date", the
            Administrative Agent shall promptly notify each Lender of (i)
            receipt of such notice and of the designation of the Tranche A
            Reduction Date and (ii) the total Tranche B Term Loan Commitment of
            all Lenders, together with such Lender's portion thereof."

     (k)    The first sentence of Section 2.16 is amended by inserting the
words "and commitment fee" after the words "facility fees".

     (l)    Section 3.17(a) is deleted and the following is inserted in place
thereof:

            "The proceeds of the Tranche A Term Loans shall be used by the
            Borrower to repay the aggregate principal amount of loans and all
            other obligations outstanding under the Existing Loan Agreement on
            the Closing Date and thereafter for general corporate purposes of
            the Borrower. The proceeds of the Tranche B Term Loans shall be used
            by the Borrower to finance the construction of the Eastchester
            Extension and Athens Expansion and for other general corporate
            purposes of the Borrower."

                                       6

<PAGE>

     (m)    The first sentence of Section 4.1 is amended by deleting the words
"Term Loan" and inserting "Tranche A Term Loan" in place thereof.

     (n)    Section 4.2 is amended by inserting the following clause at the end
thereof:

            "(c) Tranche B Term Loans. In the case of the first advance of
            Tranche B Term Loans only (i) the Administrative Agent shall have
            received evidence of the completion of the Capital Markets Issuance
            (2002) and the Borrower shall have received the net proceeds
            thereof, (ii) the Borrower shall have given notice of the Tranche A
            Reduction Date in accordance with Section 2.9 and (iii) the
            Administrative Agent shall have received the Total Tranche A
            Reduction Payment on the Tranche A Reduction Date."

     (o)    Schedule 2 is amended by deleting "Term Loan Commitment" in each
instance such term appears and by inserting "Tranche A Term Loan Commitment" in
place thereof.

     (p)    Exhibit A-1 is deleted and replaced with Exhibit A-1 attached
hereto.

     (q)    Exhibit B is deleted and replaced with Exhibit B attached hereto.

     (r)    Exhibit C is deleted and replaced with Exhibit C attached hereto.

            SECTION 3. Acknowledgement. The parties hereto acknowledge that in
connection with any Note issued to evidence the indebtedness of Term Loans
advanced pursuant to Section 2.1(a) of the Credit Agreement, in any such Note
the term "Term Loan" or "Term Loans" shall, upon the effectiveness of this
Amendment, be deemed to refer to Tranche A Term Loans. The Borrower further
acknowledges that all Notes issued and currently outstanding under the terms of
the Credit Agreement are and shall remain in full force and effect.

            SECTION 4. Representations and Warranties. The Borrower represents
and warrants as of the date hereof to each of the Administrative Agent and the
Lenders that after giving effect to this Amendment:

     (a)    The representations and warranties set forth in the Credit Agreement
are true and correct in all material respects except to the extent such
representations and warranties expressly related to an earlier date;

     (b)    No Default or Event of Default has occurred and is continuing;

     (c)    The Borrower has the partnership power and authority to execute,
deliver and perform this Amendment and has taken all partnership actions
necessary to authorize the execution, delivery and performance of this
Amendment;

     (d)    This Amendment has been duly executed and delivered on behalf of
the Borrower by a duly authorized officer or attorney-in-fact of the Borrower;

                                       7
<PAGE>

     (e)    The execution, delivery and performance of this Amendment will not
violate (i) any Requirement of Law or (ii) any contractual obligation binding on
the Borrower which could reasonably be expected to have a Material Adverse
Effect; and

     (f)    No consent or authorization of, filing with, notice to or other act
by or in respect of, any Governmental Authority or any other Person is required
in connection with the execution, delivery or performance by the Borrower of
this Amendment.

The Borrower acknowledges and agrees that the representations and warranties set
forth above shall survive the execution and delivery hereof.

            SECTION 5. Effectiveness. This Amendment shall become effective on
the date the Administrative Agent receives:

     (a)    counterparts of this Amendment that, when taken together bear the
signatures of the Borrower, each of the Lenders constituting the Majority
Lenders and each of the Lenders having Term Loans then outstanding;

     (b)    legal opinion(s) of counsel to the Borrower in form and substance
reasonably satisfactory to the Administrative Agent;

     (c)    for each Lender having Term Loans outstanding as of the date
hereof, its ratable share of an amendment fee equal to $240,000 (20 basis points
(0.20%) of $120,000,000).

     (d)    payment of all of the reasonable out-of-pocket costs and expenses
of the Administrative Agent incurred in connection with this Amendment
(including, without limitation, reasonable fees and expenses of its counsel) for
which invoices have been submitted to the Borrower; and

     (e)    payment of any other fees or other amounts relating to this
Amendment then due and payable by the Borrower under the terms of the letter
agreement dated June 19, 2002 between the Borrower and J.P. Morgan Securities
Inc.

The Administrative Agent shall promptly notify the Borrower and the Lenders of
the effective date hereof, and such notice shall be conclusive and binding on
all parties hereto.

            SECTION 6. Miscellaneous. (a) Except as expressly set forth herein,
this Amendment shall not, by implication or otherwise, limit, impair, constitute
a waiver of, or otherwise affect the rights and remedies of the Borrower, the
Lenders or the Administrative Agent, under the Credit Agreement or any other
Loan Document, and shall not alter, modify, amend or in any way affect any of
the terms, conditions, obligations, covenants or agreements contained in the
Credit Agreement or any other Loan Document, all of which are ratified and
affirmed in all respects and shall continue in full force and effect. Nothing
herein shall be deemed to entitle the Borrower to a consent to, or a waiver,
amendment, modification or other change of, any of the terms, conditions,
obligations, covenants or agreements contained in the

                                       8
<PAGE>

Credit Agreement in similar or different circumstances. This Amendment shall
apply and be effective only with respect to the provisions of the Credit
Agreement specifically referred to herein. Upon this Amendment becoming
effective as provided herein, for the purposes of Section 7(c) of the Credit
Agreement only, the term "Transaction Documents" as defined in the Credit
Agreement, shall include, without limitation, this Amendment.

     (b)    As used in the Credit Agreement, the terms "Agreement," "herein,"
"hereinafter," "hereunder," "hereto," and words of similar import shall mean,
from and after the effective date of this Amendment, the Credit Agreement as
amended by this Amendment.

     (c)    Section headings used herein are for convenience of reference only
and are not to affect the construction of, or to be taken into consideration in
interpreting, this Amendment.

     (d)    THIS AMENDMENT SHALL BE CONSTRUED IN ACCORDANCE WITH AND GOVERNED
BY THE LAWS OF THE STATE OF NEW YORK. The parties hereto each hereby consents to
the non-exclusive jurisdiction of the state and federal courts of the State of
New York and irrevocably waives all right to trial by jury in any action,
proceeding or counterclaim arising out of or relating to this Amendment.

     (e)    This Amendment may be executed in any number of counterparts, each
of which shall be an original but all of which, when taken together, shall
constitute but one instrument. Delivery of an executed counterpart of this
Amendment by fax will be deemed as effective delivery of an originally executed
counterpart.

                            [Signature pages follow]

                                       9
<PAGE>

         IN WITNESS WHEREOF, the parties hereto have caused this Amendment to be
duly executed and delivered by their proper and duly authorized officers as of
the day and year first above written.

                                BORROWER:

                                IROQUOIS GAS TRANSMISSION SYSTEM, L.P.

                                By:   IROQUOIS PIPELINE OPERATING
                                      COMPANY, its Agent

                                By:   /s/ Paul Bailey
                                      ------------------------------------
                                      Name:  Paul Bailey
                                      Title:  Vice President & Chief Financial
                                      Officer

                                By:   /s/ Craig R. Frew
                                      ------------------------------------
                                      Name:  Craig R. Frew
                                      Title:  President

                                JPMORGAN CHASE BANK (f/k/a THE
                                CHASE MANHATTAN BANK), as
                                       Administrative Agent

                                By:   /s/ D. Scott Farquhar
                                      ------------------------------------
                                      Name:  D. Scott Farquhar
                                      Title:  Vice President

                                LENDERS

                                JPMORGAN CHASE BANK(f/k/a THE
                                CHASE MANHATTAN BANK), as a
                                Lender

                                By:   /s/ D. Scott Farquhar
                                      ------------------------------------
                                      Name:  D. Scott Farquhar
                                      Title:  Vice President

                                      BANK OF MONTREAL, as a Lender

                                By:   /s/ Thomas H. Peer
                                      -------------------------------------

<PAGE>

                                      Name:  Thomas H. Peer
                                      Title:  Director

<PAGE>

                                      FLEET NATIONAL BANK, as a
                                      Lender

                                By:   /s/ Stephen J. Hoffman
                                      -------------------------------------
                                      Name:  Stephen J. Hoffman
                                      Title:  Vice President

                                      EXPORT DEVELOPMENT
                                      CANADA f/k/a EXPORT
                                      DEVELOPMENT CORPORATION,
                                      as a Lender

                                By:   /s/ Vito Di Turi
                                      -------------------------------------
                                      Name:  Vito Di Turi
                                      Title:  Loan Portfolio Manager

                                By:   /s/ William Clements
                                      -------------------------------------
                                      Name:  William Clements
                                      Title:  Loan Asset Manager

                                      KBC BANK, N.V., NEW YORK
                                      BRANCH, as a Lender

                                By :  /s/ Michael V. Curran
                                      -------------------------------------
                                      Name:  Michael V. Curran
                                      Title:  Vice President

                                By:   /s/ Susan M. Silver
                                      -------------------------------------
                                      Name:  Susan M. Silver
                                      Title:  Vice President & Team Leader

                                      THE BANK OF NEW YORK, as a
                                      Lender

                                By:   /s/ Peter Keller
                                      -------------------------------------
                                      Name:  Peter Keller
                                      Title:  Vice President

                                      BANK ONE, N.A., as a Lender

                                By :  /s/ Jane A. Bek
                                      -------------------------------------
                                      Name:  Jane A. Bek

<PAGE>

                                      Title:  Director

                                      BAYERISCHE LANDESBANK
                                      GIROZENTRALE, CAYMAN
                                      ISLANDS BRANCH, as a Lender

                                By:   /s/ Thomas von Kistowsky
                                      -------------------------------------
                                      Name:  Thomas von Kistowsky
                                      Title:  Senior Vice President
                                              and Branch Manager

                                By:   /s/ Cornelia Wintergerst
                                      -------------------------------------
                                      Name:  D. Scott Farquhar
                                        Title:  Vice President

                                      THE SUMITOMO BANK, LTD., as
                                      a Lender

                                By:   /s/ David A. Buck
                                      -------------------------------------
                                      Name:  David A. Buck
                                      Title:  Senior Vice President

<PAGE>

                                      TORONTO DOMINION (TEXAS),
                                      INC., as a Lender

                                By:   /s/ Carolyn R. Faeth
                                      -------------------------------------
                                      Name:  Carolyn R. Faeth
                                      Title:  Vice President

<PAGE>

                                                                  EXHIBIT A-1 TO
                                                                CREDIT AGREEMENT

                [TRANCHE A] [TRANCHE B] TERM LOAN PROMISSORY NOTE

$[        ]                                            New York, New York
                                                              [__________], 2002

         FOR VALUE RECEIVED, the undersigned Iroquois Gas Transmission System,
L.P., a Delaware limited partnership (the "Borrower"), hereby unconditionally
promises to pay to the order of [LENDER] (the "Lender") at the office of
JPMorgan Chase Bank (together with its successors in such capacity, the
"Administrative Agent"), located at 270 Park Avenue, New York, New York 10017,
in lawful money of the United States of America and in immediately available
funds, in accordance with Section 2.16 of the Credit Agreement (as hereinafter
defined), of ___________________ Dollars ($[      ]) or, if less, the aggregate
unpaid principal amount of all [Tranche A] [Tranche B] Term Loans made by the
Lender to the Borrower pursuant to Section 2.1(b) of that certain Credit
Agreement dated as of May 30, 2000, among the Borrower, the Lenders, the
Administrative Agent, Bank of Montreal, as Syndication Agent and Fleet National
Bank, as Documentation Agent (as amended, restated, supplemented or otherwise
modified from time to time, the "Credit Agreement"). All capitalized terms used
herein and not defined herein shall have the meanings given to them in the
Credit Agreement.

         The Borrower further agrees to pay interest in like money at such
office on the unpaid principal amount hereof from time to time outstanding at
the rates and on the dates specified in Section 2.13 of the Credit Agreement.

         The holder of this promissory note is authorized to endorse on the
schedules annexed hereto and made a part hereof or on a continuation thereof
that shall be attached hereto and made hereof, the date, Type and amount of each
[Tranche A] [Tranche B] Term Loan made pursuant to the Credit Agreement and the
date and amount of each payment or prepayment of principal thereof, each
continuation thereof, each conversion of all or a portion thereof to another
Type and, in the case of Eurodollar [Tranche A] [Tranche B] Term Loans, the
length of each Interest Period with respect thereto. Each such endorsement shall
constitute prima facie evidence of the accuracy of the information endorsed,
provided that the failure to make any such endorsement or any error of such
endorsement shall not affect the obligations of the Borrower in respect of any
[Tranche A] [Tranche B] Term Loan.

         This promissory note is one of the Notes referred to in, and is
entitled to the benefits of, the Credit Agreement which, among other things,
contain provisions for the Lender making the Loans, the indebtedness of the
Borrower resulting therefrom being evidenced by this promissory note, the
acceleration of the maturity of principal upon occurrence of Events of

                                     A-1-1

<PAGE>

Default and is subject to the provisions of the Credit Agreement for prepayments
in whole or in part on accounts of the principal balance hereof prior to the
maturity hereof.

         Upon the occurrence of any one or more of the Events of Default
specified in the Credit Agreement, all amounts then remaining unpaid on this
promissory note shall become, or may be declared to be, immediately due and
payable, all as provided in the Credit Agreement.

         Except as expressly provided in Section 7 of the Credit Agreement,
Borrower hereby waives presentment, demand, notice of dishonor, protest and any
other notice or formality with respect to this promissory note.

         In no contingency or event whatsoever shall interest be charged
hereunder, however such interest may be characterized or computed if it would
exceed the highest interest permissible under any law which a court of competent
jurisdiction shall, in a final determination, deem applicable hereto. In event
that such a court determine that the Lender has received interest hereunder in
excess of the highest rate applicable hereto, any such excess interest collected
by the Lender shall be deemed to have been a repayment of principal and shall be
so applied.

         None of the Partners or the Partner Parents shall be personally liable
for any obligation of the Borrower under this promissory note or for the
performance of any obligation of the Borrower hereunder. The exclusive recourse
of the Lender for the satisfaction of payment under this promissory note shall
be against the Borrower and its assets (and not against any assets or property
of the Partners or the Partner Parents). In the event that any default occurs in
connection with the obligations of the Borrower under this promissory note, no
action shall be brought against the Partners or the Partner Parents if such
action is predicated solely on such Person's direct or indirect ownership in the
Borrower. In the event of foreclosure or other sale or disposition of
properties, no judgment for any deficiency upon the obligations of the Borrower
under this promissory note shall be obtainable by the Lender against the
Partners or the Partner Parents.

         THIS PROMISSORY NOTE SHALL BE GOVERNED BY, AND CONSTRUED AND
INTERPRETED IN ACCORDANCE WITH, THE LAWS OF THE STATE OF NEW YORK.

                                     A-1-2

<PAGE>

         Wherever possible, each provision of this promissory note shall be
interpreted in such manner as to be effective and valid under applicable law,
but if any provision of this promissory note shall be prohibited or invalidity,
without invalidating the remainder of such provision or the remaining provisions
of this promissory note.

                               IROQUOIS GAS TRANMISSION SYSTEM, L.P.

                               By:  IROQUOIS PIPELINE OPERATING
                                     COMPANY, its Agent

                                    By:
                                       -------------------------------------
                                    Name:
                                         -----------------------------------
                                    Title:
                                          ----------------------------------

                                    By:
                                       -------------------------------------
                                    Name:
                                         -----------------------------------
                                    Title:
                                          ----------------------------------

<PAGE>

                                                             Schedule A to Note

<TABLE>
<CAPTION>

                                [TRANCHE A] [TRANCHE B] TERM LOANS, CONVERSIONS AND
                                              REPAYMENTS OF ABR LOANS

                                              Amount of Eurodollar                             Amount of
                                                Tranche [A] [B]                           ABR Loans Converted
                                                   Term Loans                                to Eurodollar
                             Amount of          Converted to ABR    Amount of Principal     Tranche [A] [B]
         Date                ABR Loans               Loans          of ABR Loans Repaid        Term Loans
         ----                ---------               -----          -------------------        ----------
<S>                     <C>                   <C>                   <C>                   <C>

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</TABLE>

<TABLE>
<CAPTION>

   Unpaid Principal
      Balance of
      ABR Loans          Notation Made by
      ---------          ----------------
 <S>                   <C>

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</TABLE>

<PAGE>

<TABLE>
<CAPTION>

                                [TRANCHE A] [TRANCHE B] TERM LOANS, CONVERSIONS AND
                                          REPAYMENTS OF EURODOLLAR LOANS

                                      Amount of ABR                       Amount of      Amount of           Unpaid
                                          Loans                         Principal of     Eurodollar          Principal
                      Amount of       Converted to    Interest Period    Eurodollar     Tranche [A] [B]     Balance of
                      Eurodollar       Eurodollar     and Eurodollar     Tranche [A]       Term Loans       Eurodollar
                      Tranche [A]      Tranche [A]       Rate with     [B] Term Loans     Converted to      Tranche [A]
       Date         [B] Term Loans   [B] Term Loans   Respect Thereto      Repaid          ABR Loans      [B] Term Loans

<S>                 <C>              <C>              <C>              <C>              <C>               <C>
------------------- ---------------- ---------------- ---------------- ---------------- ----------------- ----------------

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</TABLE>

<TABLE>
<CAPTION>

Notation Made
       by

<S>     <C>
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</TABLE>

<PAGE>

                                                                    EXHIBIT B TO
                                                                CREDIT AGREEMENT

                          FORM OF BORROWING CERTIFICATE

                                                                          [DATE]

To:      JPMorgan Chase Bank, as Administrative Agent

         Pursuant to Section 2.5 of that certain CREDIT AGREEMENT dated as of
May 30, 2000 (the "Credit Agreement"), among IROQUOIS GAS TRANSMISSION SYSTEM,
L.P., a Delaware limited partnership, as Borrower, the several banks and other
financial institutions from time to time parties to the Credit Agreement (the
"Lenders"), JPMORGAN CHASE BANK (formerly known as THE CHASE MANHATTAN BANK), as
Administrative Agent (as therein defined), BANK OF MONTREAL, as Syndication
Agent and FLEET NATIONAL BANK, as Documentation Agent, the Borrower hereby gives
notice of its desire to receive a [Revolving Credit] [Tranche A Term] [Tranche B
Term] [Swingline] Loans in accordance with the terms set forth below (all
capitalized terms used herein and not otherwise defined herein shall have the
meaning specified in the Credit Agreement):

                    (a) The date of the Loans to be made pursuant to this
            Borrowing Certificate shall be _______________, _____ (the
            "Borrowing Date") [the date inserted must be [a Business Day and
            notice must be received by the Administrative Agent prior to
            10:00A.M. New York City time on the requested Borrowing Date
            (applicable only to ABR Loans)] [a Working Day and notice must be
            received by the Administrative Agent prior to 12:00 Noon, New York
            City time not less than three (3) Working Days prior to the
            requested Borrowing Date (applicable only to Eurodollar Loans)]].

                    (b) The aggregate principal amount of the Loans shall be
            _______ DOLLARS ($____________)1.

                    (c) The Type [or Types] of the Loans shall be a [ABR]
            [Eurodollar] Loan.

                    (d) The initial Interest Period shall be a [ ] month
            interest period (applicable only to Eurodollar Loans).

------------------------
     (1) Any borrowing of Tranche B Term Loans shall be in an amount equal to
$[5,000,000] or a whole multiple of $1,000,000 in excess thereof.

                                      B-1

<PAGE>

         The undersigned hereby certifies that the following statements will be
true on the date of the proposed Loans, immediately prior to or concurrently
with the making of such Loans:

                    (1) each of the representations and warranties made by the
         undersigned in or pursuant to the Loan Documents are true and correct
         in all material respects as if made on and as of such date, except for
         any representations and warranties which relate to an earlier date; and

                    (2) no Default or Event of Default shall have occurred and
         be continuing on such date or after giving effect to the Loans
         requested to be made on such date.

                                 IROQUOIS GAS TRANSMISSION
                                     SYSTEM, L.P.

                                 By: IROQUOIS PIPELINE OPERATING
                                     COMPANY, its Agent

                                 By:
                                    -------------------------------------------
                                    Name:
                                 ----------------------------------------
                                    Title:
                                 ----------------------------------------

                                 By:
                                    -------------------------------------------
                                    Name:
                                         --------------------------------------
                                    Title:
                                          -------------------------------------

                                      B-2

<PAGE>

                                                                       EXHIBIT C
                                                                          TO THE
                                                                CREDIT AGREEMENT

                     COMMITMENT AND LOAN TRANSFER SUPPLEMENT

         Reference is made to the Credit Agreement, dated as of May 30, 2000 (as
amended, supplemented or otherwise modified from time to time, the "Credit
Agreement"), among Iroquois Gas Transmission System, L.P. (the "Borrower"), the
banks and other financial institutions parties thereto (collectively, the
"Lenders"), JPMorgan Chase Bank (formerly known as The Chase Manhattan Bank), as
administrative agent for the Lenders (in such capacity, the "Administrative
Agent"), Bank of Montreal, as Syndication Agent and Fleet National Bank, as
Documentation Agent. Unless otherwise defined herein, terms defined in the
Credit Agreement and used herein shall have the meanings given to them in the
Credit Agreement.

         ____________________ (the "Assignor") and ____________________ (the
"Assignee") agree as follows:

         1.    The Assignor hereby irrevocably sells and assigns to the Assignee
without recourse to the Assignor, and the Assignee hereby irrevocably purchases
and assumes from the Assignor without recourse to the Assignor, as of the
Transfer Effective Date (as defined below), a ____% interest (the "Assigned
Interest") in and to the Assignor's rights and obligations under the Credit
Agreement with respect to those credit facilities contained in the Credit
Agreement as are set forth on Schedule 1 hereto (individually, an "Assigned
Facility"; collectively, the "Assigned Facilities"), in a principal amount for
each Assigned Facility as set forth on Schedule 1 hereto.

         2.    The Assignor (a) makes no representation or warranty and
assumes no responsibility with respect to any statements, warranties or
representations made in or in connection with the Credit Agreement or the
execution, legality, validity, enforceability, genuineness, sufficiency or value
of the Credit Agreement or any other instrument or document furnished pursuant
thereto, other than that it has not created any adverse claim upon the interest
being assigned by it hereunder and that such interest is free and clear of any
such adverse claim; and (b) makes no representation or warranty and assumes no
responsibility with respect to the financial condition of the Borrower, any of
its Subsidiaries or any other obligor or the performance or observance by the
Borrower, any of its Subsidiaries or any other obligor of any of their
respective obligations under the Credit Agreement or any other instrument or
document furnished pursuant hereto or thereof.

         3.    The Assignee (a) represents and warrants that it is legally
authorized to enter into this Commitment and Loan Transfer Supplement; (b)
confirms that it has received a copy of the Credit Agreement, together with
copies of the financial statements delivered pursuant thereto and such other
documents and information as it has deemed appropriate to make its own credit
analysis and decision to enter into this

                                      C-1

Commitment and Loan Transfer Supplement; (c) agrees that it will, independently
and without reliance upon the Assignor, the Administrative Agent, the
Syndication Agent, the Documentation Agent or any other Lender and based on such
documents and information as it shall deem appropriate at the time, continue to
make its own credit decisions in taking or not taking action under the Credit
Agreement or any other instrument or document furnished pursuant hereto or
thereto; (d) appoints and authorizes the Administrative Agent to take such
action as agent on its behalf and to exercise such powers and discretion under
the Credit Agreement or any other instrument or document furnished pursuant
hereto or thereto as are delegated to the Administrative Agent by the terms
thereof, together with such powers as are incidental thereto; and (e) agrees
that it will be bound by the provisions of the Credit Agreement and will perform
in accordance with its terms all the obligations which by the terms of the
Credit Agreement are required to be performed by it as a Lender.

         4.    The effective date of this Commitment and Loan Transfer
Supplement shall be __________ __, ____ (the "Transfer Effective Date").
Following the execution of this Commitment and Loan Transfer Supplement, it will
be delivered to the Administrative Agent for acceptance by it and recording by
the Administrative Agent in the Register pursuant to subsection 10.6(c) of the
Credit Agreement, effective as of the Transfer Effective Date.

         5.    Upon such acceptance and recording, from and after the
Transfer Effective Date, the Administrative Agent shall make all payments in
respect of the Assigned Interest (including payments of principal, interest,
fees and other amounts) to the Assignee whether such amounts have accrued prior
to the Transfer Effective Date or accrue subsequent to the Transfer Effective
Date. The Assignor and the Assignee shall make all appropriate adjustments in
payments by the Administrative Agent for periods prior to the Transfer Effective
Date or with respect to the making of this assignment directly between
themselves.

         6.    From and after the Transfer Effective Date, (a) the Assignee
shall be a party to the Credit Agreement and shall be bound by the provisions
thereto and, to the extent provided in this Commitment and Loan Transfer
Supplement, have the rights and obligations of a Lender thereunder, with its
Commitments as set forth in Schedule 1 attached hereto and (b) the Assignor
shall, to the extent provided in this Commitment and Loan Transfer Supplement,
relinquish its rights and be released from its obligations under the Credit
Agreement [and the Assignor shall cease to be a party to the Credit Agreement
(if the Assignor is assigning all or the remaining portion of the Assignor's
rights and obligations under the Credit Agreement)].

         7.    This Commitment and Loan Transfer Supplement shall be governed
by, and construed and interpreted in accordance with, the laws of the State of
New York.

         IN WITNESS WHEREOF, the parties hereto have caused this Commitment and
Loan Transfer Supplement to be executed as of the date first above written by
their respective duly authorized officers on Schedule 1 hereto.

                                      C-2

<PAGE>

                                   SCHEDULE 1
                   TO COMMITMENT AND LOAN TRANSFER SUPPLEMENT
                  RELATING TO THE CREDIT AGREEMENT, DATED AS OF
                                  MAY 30, 2000
                                      AMONG
                     IROQUOIS GAS TRANSMISSION SYSTEM, L.P.,
                           THE LENDERS NAMED THEREIN,
              JPMORGAN CHASE BANK (f/k/a THE CHASE MANHATTAN BANK),
                     AS ADMINISTRATIVE AGENT FOR THE LENDERS
                   BANK OF MONTREAL, AS SYNDICATION AGENT, AND
                   FLEET NATIONAL BANK, AS DOCUMENTATION AGENT
--------------------------------------------------------------------------------

Name of Assignor:

Name of Assignee:

Transfer Effective Date of Assignment:

               Credit                Principal           Commitment Percentage
         Facility Assigned(2)     Amount Assigned               Assigned(3)
         --------------------     ---------------               -----------

Revolving Credit Commitment:      $_______________       _____._______________%

Tranche A Term Loan Commitment:   $_______________       _____._______________%

Tranche B Term Loan Commitment:   $_______________       _____._______________%

          [Name of Assignee]                             [Name of Assignor]

By                                     By
  ---------------------------            ---------------------------------
Name:                                  Name:
Title:                                 Title:

-------------------------
         2 After giving effect to this Commitment and Loan Transfer Supplement,
each of the Assignor and the Assignee must have Commitments in the aggregate of
not less than $5,000,000 unless the Assignor is assigning all of its Commitments
[Loans] pursuant to Section 2.22(c) of the Credit Agreement.
         3 Calculate the Commitment Percentage that is assigned to at least 15
decimal places and show as a percentage of the aggregate commitments of all
Lenders.

<PAGE>

Accepted:                                 [Consented To:

JPMORGAN CHASE BANK (f/k/a THE            IROQUOIS GAS TRANSMISSION
    CHASE MANHATTAN BANK), as             SYSTEM, L.P.
    Administrative Agent
                                          BY: IROQUOIS PIPELINE OPERATING
                                              COMPANY, as its Agent

By                                        By
  -----------------------------------        ----------------------------------
Name:                                     Name:
Title:                                    Title:]

Source: [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00049-of-00352.parquet"}, [{"source": "alea-institute/alea-institute/kl3m-data-edgar-agreements/train-00049-of-00352.parquet"}]]