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Portland Natural Gas Transmission System   Original Sheet No. 383 : Effective
FERC Gas Tariff
Portland Natural Gas Transmission System

                   GENERAL TERMS AND CONDITIONS (Continued)
        23.1 Waiver of Default.  No waiver by either Transporter or Shipper of
any one or more defaults by the other in the performance of any provisions of
a Gas Transportation Contract, the General Terms and Conditions or the
applicable Rate Schedule shall operate or be construed as a waiver of any
future default or defaults, whether of a like or of a different character.
This provision shall not be interpreted as providing Transporter or Shipper
with any powers or authorizations to grant or deny waivers over and above such
powers as are provided under the FERCs regulations and Maine contract law.
        23.2 Assignability.  A Gas Transportation Contract shall bind and
inure to the respective successors and assigns of the parties thereto, but no
assignment shall release either party from such partys obligations without
the written consent of the other party, which consent shall not be
unreasonably withheld.  Nothing contained herein shall prevent either party
from pledging, mortgaging or assigning its rights as security for its
indebtedness and either party may assign to the pledges or mortgages (or to a
trustee for the holder of such indebtedness) any money due or to become due
under any Gas Transportation Contract.
        23.3 Effect of Headings.  The headings used throughout this Tariff and
in executed Gas Transportation Contracts are inserted for reference purposes
only and are not to be considered or taken into account in construing the
terms and provisions of any paragraph nor to be deemed in any way to qualify,
modify or explain the effects of any such terms or provisions.
        23.4 Notice.  Any communication, notice, request, demand, statement or
bill provided for in this Tariff or in a Gas Transportation Contract, or any
notice which either Transporter or Shipper may desire to give to the other,
shall be offered in writing, unless transmitted via Transporters Interactive
Internet Website, and shall be considered as duly presented, rendered, or
delivered when sent, if sent by telegram, cable, telecopy or telex; or, if
sent by express mail service, shall be considered as duly presented one Day
after mailing; or, if prepaid registered or ordinary mail, shall be considered
as duly presented five (5) Days after mailing.  The material so sent shall be
addressed to the pertinent party at its last known address.
        23.5 References.  When used immediately after a section number
reference in a particular document (e.g., the General Terms and Conditions) in
this Tariff, the word "herein" shall refer to a section of that same document,
irrespective of whether such cited section occurs before or after the subject

Issued by: David J.Haag, Rates And Tariff Specialist
Issue date: 07/28/06 Effective date: 09/01/06