Document:

<Page>

                                                                 EXHIBIT 10.8.34

                                    AMENDMENT

Date:   Jul 23, 2001

"Transporter":  ANR PIPELINE COMPANY

"Shipper":      SITHE/INDEPENDENCE POWER PARTNERS L. P.

     FTS-1 Contract No. 19630 dated Apr 15, 1997 ("Agreement") between
Transporter and Shipper is amended effective Jul 31, 2001 as follows:

     Transporter and Shipper hereby agree to terminate the above-referenced
Agreement, effective July 31, 2001, without any further liability or obligation
whatsoever between the parties. Notwithstanding the termination of the
Agreement, Shipper shall be liable for all amounts due under the Agreements for
services rendered by Transporter up to and including the termination date.

SITHE/INDEPENDENCE POWER PARTNERS L. P.
"SHIPPER"

<Page>

BY: /s/ Martin B. Rosenberg
    --------------------------------
TITLE: Senior Vice President

DATE:  July 26, 2001

ANR PIPELINE COMPANY
"TRANSPORTER"

BY: /s/ Joseph E. Pollard
    --------------------------------
TITLE: Director, Transportation Services

DATE:  August 3, 2001<Page>

                                                                 EXHIBIT 10.8.35

                                                 Contract No:  19600
                                                 Amendment No:       02

                                    AMENDMENT

Date:  Jul 23, 2001

"Transporter":  ANR PIPELINE COMPANY

"Shipper":      SITHE/INDEPENDENCE POWER PARTNERS L. P.

     FTS-1 Contract No. 19600 dated Nov 01, 1993 ("Agreement") between
Transporter and Shipper is amended effective Jul 31, 2001 as follows:

Transporter and Shipper hereby agree to terminate the above-referenced
Agreement, effective July 31, 2001, without any further liability or obligation
whatsoever between the parties. Notwithstanding the termination of the
Agreement, Shipper shall be liable for all amounts due under the Agreements for
services rendered by Transporter up to and including the termination date.

SITHE/INDEPENDENCE POWER PARTNERS L. P.
"SHIPPER"

BY: /s/ Martin B. Rosenberg
    -------------------------------
TITLE: Senior Vice President

DATE:  July 26, 2001

ANR PIPELINE COMPANY
"TRANSPORTER"

BY: /s/ Joseph E. Pollard
    -------------------------------
TITLE: Director, Transportation Services

DATE:  August 3, 2001

<Page>

                                                 Contract No:  19600
                                                 Amendment No:       02<Page>

                                                                 EXHIBIT 10.8.36

                        PERMANENT TRANSPORTATION CONTRACT
                           ASSIGNMENT AGREEMENT - FULL

THIS AGREEMENT made effective as of the 1st day of August, 2001.

BETWEEN:

SITHE/INDEPENDENCE POWER PARTNERS L.P., a Limited Partnership governed pursuant
to the laws of the United States having an office in the City of New York, in
the State of New York (hereinafter referred to as the "Assignor")

                                                               OF THE FIRST PART

                                     - and -

ENRON NORTH AMERICA CORP., a Company governed pursuant to the laws of the United
States having an office in the City of Houston, in the State of Texas
(hereinafter referred to as the "Assignee")

                                                              OF THE SECOND PART
                                     - and -

TRANSCANADA PIPELINES LIMITED, a body corporate governed pursuant to the laws of
Canada having an office in the City of Calgary, in the Province of Alberta
(hereinafter referred to as the "TransCanada")

                                                               OF THE THIRD PART

WITNESSES THAT:

     WHEREAS TransCanada and Assignor are parties to a firm transportation
service contract to the Chippawa Delivery Point dated as of March 9, 1994
identified in TransCanada's records as Contract No. 5024 for a quantity of
124,142 GJ per day, (such agreement together with any and all amendments thereto
being hereinafter called the "Contract"); and

     WHEREAS Assignor wishes to assign, set over, transfer and convey all of the
Assignor's interest in, to and under the Contract (the "Assigned Interest") to
Assignee, and all of the rights and obligations of the Assignor under the
Contract as they relate to the Assigned Interest;

     AND WHEREAS TransCanada has agreed to consent to the assignment to the
Assignee of the Assigned Interest subject to the terms and conditions of this
Agreement.

     NOW THEREFORE in consideration of the mutual covenants and premises herein
contained, and the payment of One Dollar ($1.00) by each party to the other
parties, receipt and sufficiency of which is acknowledged, the parties agree as
follows:

1.   The Assignor hereby assigns, transfers, sets over and conveys to the
     Assignee, effective as of the 1st day of August, 2001 (the "Effective
     Date") the Assigned Interest and all of the Assignor's rights and
     obligations in, to, and under the Contract, insofar as they relate to the
     Assigned Interest, TO HAVE AND TO HOLD the same unto Assignee for its sole
     use and benefit absolutely from and after the Effective Date hereof.

<Page>

                                                       PERMANENT FULL ASSIGNMENT

2.   The Assignee hereby accepts the assignment herein provided and covenants
     and agrees with the Assignor and TransCanada that the Assignee shall at all
     times, from and after the Effective Date, be bound by, observe and perform
     all of the duties and obligations on the part of the Assignor under the
     Contract, insofar as they relate to the Assigned Interest, accruing or
     arising on and after the Effective Date hereof as if it had been originally
     named as Shipper under the Contract to the extent of the Assigned Interest.

3.   Subject to paragraphs 5 and 6 hereof, TransCanada, by its execution hereof,
     hereby consents to the assignment herein provided and agrees that from and
     after the Effective Date the Assignee shall be entitled to hold and enforce
     all the benefits, rights and privileges of the Assignor under the Contract,
     insofar as they relate to the Assigned Interest, as if it had been
     originally named as shipper under the Contract.

4.   Subject to paragraphs 5 and 6 hereof, the Assignor is hereby released, as
     and from the Effective Date, from its obligations under the Contract,
     provided that nothing herein shall release the Assignor from any of its
     obligations under the Contract arising or attributable to the period prior
     to the Effective Date.

5.   Notwithstanding any other provision contained in the Agreement, the parties
     agree that this assignment shall be subject to and conditional upon the
     following:

     (a)  If requested by TransCanada, the Assignee shall provide to
          TransCanada, prior to the Effective Date, financial assurance in
          accordance with Section XXIII of the General Terms and Conditions set
          forth in TransCanada's Transportation Tariff, on terms satisfactory to
          TransCanada; and

     (b)  TransCanada and the Assignee shall execute, prior to the Effective
          Date, a firm transportation service contract; (the "Assignee's
          Contract") wherein TransCanada provides to the Assignee firm
          transportation service in a quantity equal to 124,142 GJ (the
          "Contract Demand") and for the term commencing the Effective Date and
          continuing to and including the 31st day of October, 2015 (the
          "Term").

6.   The parties acknowledge and agree that this Agreement shall be null and
     void and that the assignment herein provided shall be of no force or effect
     unless the conditions contained in paragraph 5 hereof have been fulfilled
     on or before the Effective Date.

7.   The parties acknowledge and agree that upon execution of the Assignee's
     Contract and upon receipt by TransCanada of financial assurances from the
     Assignee (if so requested by TransCanada pursuant to paragraph 5(a) hereof)
     the Contract and all rights and obligations of the Assignor under the
     Contract shall terminate and be at an end as and from the Effective Date
     and the Assignee's Contract shall be the sole surviving document governing
     the Assigned Interest from and after the Effective Date.

8.   Notwithstanding paragraph 2 and subject to paragraphs 5 and 6 hereof, the
     parties acknowledge and agree that the Assignee shall be responsible for
     all gas imbalances associated with the Contract, as the same may be
     determined by TransCanada in its sole discretion and regardless of whether
     such gas imbalances were incurred before, on or after the Effective Date,
     and as and from the Effective Date the Assignor shall have no rights or
     obligations in respect of any such gas imbalances.

<Page>

                                                       PERMANENT FULL ASSIGNMENT

9.   For the purposes of Section 6.1 of the Contract, the Assignee's address
     shall be:

     (i)    Mailing address:      1400 Smith Street
                                  Houston, Texas
                                  77002

     (ii)   Delivery address:     same as above

     (iii)  Nominations:          Attention:           Lisa Kinsey
                                  Telecopy:            (713) 646-3338

     (iv)   Invoices:             Attention:           Rita Wayne
                                  Telecopy:            (713) 646-8420

     (v)    Other matters:        Attention:           Steve Van Hooser
                                  Telecopy:            (713) 646-3393

10.  This Agreement and the rights and obligations of the parties hereunder are
     subject to all valid and applicable present and future laws, rules,
     regulations, and orders of any regulatory or legislative authority having
     jurisdiction or control over TransCanada's Transportation Tariff (including
     without limitation the FT Toll Schedule and the General Terms and
     Conditions set forth in such Tariff).

11.  This Agreement shall be construed in accordance with and governed by the
     laws of the Province of Alberta and the laws of Canada applicable therein.

12.  This Agreement may be executed in as many counterparts as deemed necessary
     and when so executed shall have the same effect as if all parties had
     executed the same document. Each party executing a counterpart of this
     Agreement shall deliver one copy of such counterpart to the other parties.
     This Agreement may be delivered by electronic facsimile transmission and
     each copy of this Agreement so delivered shall be deemed to be an
     originally executed copy for all purposes.

13.  All terms and words herein capitalized and not otherwise defined in this
     Agreement shall have the meanings ascribed thereto in the FT Toll Schedule,
     the List of Tolls and the General Terms and Conditions of TransCanada's
     Transportation Tariff as amended from time to time by the National Energy
     Board.

14.  This Agreement shall enure to the benefit of and be binding upon the
     parties hereto and their respective successors and permitted assigns.

<Page>

                                                       PERMANENT FULL ASSIGNMENT

15.  Each of the parties hereto, by the execution and delivery of this
     Agreement, irrevocably and unconditionally, with respect an any matter or
     thing arising out of this Agreement or the Contract, attorns and submits
     to, and accepts the jurisdiction of, the courts of the Province of Alberta.

     IN WITNESS WHEREOF THE DULY AUTHORIZED PARTIES HERETO HAVE PROPERLY
EXECUTED THIS Agreement all as and from the date first above written.

SITHE/INDEPENDENCE POWER PARTNERS L.P.       ENRON NORTH AMERICA CORP.

per: /s/ Martin B. Rosenberg                 per: /s/ Jeffrey M. Donahue, Jr.
     -------------------------------              ------------------------------
name: Martin B. Rosenberg                    name: Jeffrey M. Donahue, Jr.
     -------------------------------              ------------------------------
title:Senior Vice President                  title:Managing Director
     -------------------------------              ------------------------------

per: /s/ Sandra J. Manilla                   per: /s/ L. Don Miller
     -------------------------------              ------------------------------
name: Sandra J. Manilla                      name: L. Don Miller
     -------------------------------              ------------------------------
title:Vice President and Treasurer           title:Vice President
     -------------------------------              ------------------------------

TRANSCANADA PIPELINES LIMITED
                                             -----------------------------------
per: /s/ Iain DRM MacRae                              Contract Approval
     -------------------------------
                                             -----------------------------------
name:    Iain DRM MacRae                     Customer Service Leader
     -------------------------------
                                             ------------------------ ----------
title:      Manager, Sales                   Customer Representative
     -------------------------------
                                             ------------------------ ----------
                                             Legal Review              PROFORMA
                                                                       APPROVED
                                             ------------------------ ----------

per: /s/ Amelia Cheung
     -------------------------------
name: Amelia Cheung
     -------------------------------
title:Sales Representative
     -------------------------------

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