Document:

<PAGE>
                                                                 EXHIBIT 4(j)(5)

Centerpoint Energy Houston Electric, LLC
1111 Louisiana
Houston, TX  77002

================================================================================

                    CENTERPOINT ENERGY HOUSTON ELECTRIC, LLC

                                       TO

                               JPMORGAN CHASE BANK
                                     Trustee

                                   ----------

                          FOURTH SUPPLEMENTAL INDENTURE

                          Dated as of October 10, 2002

                                   ----------

                  Supplementing the General Mortgage Indenture
                          Dated as of October 10, 2002

         THIS INSTRUMENT GRANTS A SECURITY INTEREST BY A PUBLIC UTILITY

           THIS INSTRUMENT CONTAINS AFTER-ACQUIRED PROPERTY PROVISIONS

 This instrument is being filed pursuant to Chapter 35 of the Texas Business and
                                  Commerce Code

================================================================================

<PAGE>

FOURTH SUPPLEMENTAL INDENTURE, dated as of October 10, 2002, between CENTERPOINT
ENERGY HOUSTON ELECTRIC, LLC, a limited liability company organized and existing
under the laws of the State of Texas (herein called the "Company"), having its
principal office at 1111 Louisiana, Houston, Texas 77002, and JPMORGAN CHASE
BANK, a banking corporation duly organized and existing under the laws of the
State of New York, as Trustee (herein called the "Trustee"), the office of the
Trustee at which on the date hereof its corporate trust business is administered
being 600 Travis Street, Suite 1150, Houston, Texas 77002.

                             RECITALS OF THE COMPANY

WHEREAS, the Company has heretofore executed and delivered to the Trustee a
General Mortgage Indenture dated as of October 10, 2002 (the "Indenture")
providing for the issuance by the Company from time to time of its bonds, notes
or other evidence of indebtedness to be issued in one or more series (in the
Indenture and herein called the "Securities") and to provide security for the
payment of the principal of and premium, if any, and interest, if any, on the
Securities; and

WHEREAS, the Company, in the exercise of the power and authority conferred upon
and reserved to it under the provisions of the Indenture and pursuant to
appropriate resolutions of the Manager, has duly determined to make, execute and
deliver to the Trustee this Fourth Supplemental Indenture to the Indenture as
permitted by Sections 201, 301 and 1401 of the Indenture in order to establish
the form or terms of, and to provide for the creation and issuance of, the
Securities specified in clause (4) of the definition of the "Initial Series"
under the Indenture in an initial aggregate principal amount of $100,000,000
(such series being hereinafter and in the Indenture referred to as the "Initial
Series (4)"); and

WHEREAS, all things necessary to make the Securities of the Initial Series (4),
when executed by the Company and authenticated and delivered by the Trustee or
any Authenticating Agent and issued upon the terms and subject to the conditions
hereinafter and in the Indenture set forth against payment therefor the valid,
binding and legal obligations of the Company and to make this Fourth
Supplemental Indenture a valid, binding and legal agreement of the Company, have
been done;

NOW, THEREFORE, THIS FOURTH SUPPLEMENTAL INDENTURE WITNESSETH that, in order to
establish the terms of a series of Securities, and for and in consideration of
the premises and of the covenants contained in the Indenture and in this Fourth
Supplemental Indenture and for other good and valuable consideration the receipt
and sufficiency of which are hereby acknowledged, it is mutually covenanted and
agreed as follows:

<PAGE>

                                   ARTICLE ONE

                        DEFINITIONS AND OTHER PROVISIONS
                             OF GENERAL APPLICATION

         Section 101. Definitions. Each capitalized term that is used herein and
is defined in the Indenture shall have the meaning specified in the Indenture
unless such term is otherwise defined herein.

                                   ARTICLE TWO

                       TITLE, FORM AND TERMS OF THE BONDS

         Section 201. Title of the Bonds. This Fourth Supplemental Indenture
hereby creates a series of Securities designated as the "General Mortgage Bonds,
Series D, due May 1, 2019" of the Company (collectively referred to herein as
the "Bonds"). For purposes of the Indenture, the Bonds shall constitute a single
series of Securities and may be issued in an unlimited principal aggregate
amount, although the initial issuance of the Bonds shall be in the principal
amount of $100,000,000.

         Section 202. Form and Terms of the Bonds. The form and terms of the
Bonds will be set forth in an Officer's Certificate delivered by the Company to
the Trustee pursuant to the authority granted by this Fourth Supplemental
Indenture in accordance with Sections 201 and 301 of the Indenture.

         Section 203. Treatment of Proceeds of Title Insurance Policy. Any
moneys received by the Trustee as proceeds of any title insurance policy on
Mortgaged Property of the Company shall be subject to and treated in accordance
with the provisions of Section 607(2) of the Indenture (other than the last
paragraph thereof).

                                  ARTICLE THREE

                            MISCELLANEOUS PROVISIONS

The Trustee makes no undertaking or representations in respect of, and shall not
be responsible in any manner whatsoever for and in respect of, the validity or
sufficiency of this Fourth Supplemental Indenture or the proper authorization or
the due execution hereof by the Company or for or in respect of the recitals and
statements contained herein, all of which recitals and statements are made
solely by the Company.

Except as expressly amended and supplemented hereby, the Indenture shall
continue in full force and effect in accordance with the provisions thereof and
the Indenture is in all respects hereby ratified and confirmed. This Fourth
Supplemental Indenture and all of its provisions shall be deemed a part of the
Indenture in the manner and to the extent herein and therein provided.

<PAGE>

This Fourth Supplemental Indenture shall be governed by, and construed in
accordance with, the law of the State of New York.

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

<PAGE>

                  IN WITNESS WHEREOF, the parties hereto have caused this Fourth
Supplemental Indenture to be duly executed as of the day and year first above
written.

                                      CENTERPOINT ENERGY HOUSTON ELECTRIC, LLC

                                      By:   /s/ Marc Kilbride
                                         ---------------------------------------
                                         Name:  Marc Kilbride
                                         Title: Vice President and Treasurer

                                      JPMORGAN CHASE BANK, as Trustee

                                      By:   /s/ Rhonda L. Parman
                                         ---------------------------------------
                                         Name:  Rhonda L. Parman
                                         Title: Vice President and Trust Officer

                                 ACKNOWLEDGMENT

STATE OF TEXAS             )
                           )       ss
COUNTY OF HARRIS           )

                  On the 10th day of October 2002, before me personally came
Marc Kilbride, to me known, who, being by me duly sworn, did depose and say that
he resides in Harris County, Texas; that he is the Vice President and Treasurer
of CenterPoint Energy, Houston Electric, LLC, a Texas limited liability company,
the limited liability company described in and which executed the foregoing
instrument; and that he signed his name thereto by authority of the sole manager
of said limited liability company.

                                       /s/ Mary Etta Gaut
                                       -----------------------------------------
                                       Notary Public

Seal of Notary Public

<PAGE>

                                 ACKNOWLEDGMENT

STATE OF TEXAS             )
                           )       ss
COUNTY OF HARRIS           )

                  On the 10th day of October 2002, before me personally came
Rhonda L. Parman, to me known, who, being by me duly sworn, did depose and say
that she resides in Houston, Texas; that she is Vice President and Trust Officer
of JPMorgan Chase Bank, a banking corporation organized under the state of New
York, the ___________________ described in and which executed the foregoing
instrument; and that she signed her name thereto by authority of the board of
directors of corporation.

                                       /s/ Treva Bushnell
                                       -----------------------------------------
                                       Notary Public

Seal of Notary Public<PAGE>
                                                                 EXHIBIT 4(j)(6)

Centerpoint Energy Houston Electric, LLC
1111 Louisiana
Houston, TX  77002

================================================================================

                    CENTERPOINT ENERGY HOUSTON ELECTRIC, LLC

                                       TO

                               JPMORGAN CHASE BANK
                                     Trustee

                                   ----------

                          FIFTH SUPPLEMENTAL INDENTURE

                          Dated as of October 10, 2002

                                   ----------

                  Supplementing the General Mortgage Indenture
                          Dated as of October 10, 2002

         THIS INSTRUMENT GRANTS A SECURITY INTEREST BY A PUBLIC UTILITY

           THIS INSTRUMENT CONTAINS AFTER-ACQUIRED PROPERTY PROVISIONS

 This instrument is being filed pursuant to Chapter 35 of the Texas Business and
                                  Commerce Code

================================================================================

<PAGE>

FIFTH SUPPLEMENTAL INDENTURE, dated as of October 10, 2002, between CENTERPOINT
ENERGY HOUSTON ELECTRIC, LLC, a limited liability company organized and existing
under the laws of the State of Texas (herein called the "Company"), having its
principal office at 1111 Louisiana, Houston, Texas 77002, and JPMORGAN CHASE
BANK, a banking corporation duly organized and existing under the laws of the
State of New York, as Trustee (herein called the "Trustee"), the office of the
Trustee at which on the date hereof its corporate trust business is administered
being 600 Travis Street, Suite 1150, Houston, Texas 77002.

                             RECITALS OF THE COMPANY

WHEREAS, the Company has heretofore executed and delivered to the Trustee a
General Mortgage Indenture dated as of October 10, 2002 (the "Indenture")
providing for the issuance by the Company from time to time of its bonds, notes
or other evidence of indebtedness to be issued in one or more series (in the
Indenture and herein called the "Securities") and to provide security for the
payment of the principal of and premium, if any, and interest, if any, on the
Securities; and

WHEREAS, the Company, in the exercise of the power and authority conferred upon
and reserved to it under the provisions of the Indenture and pursuant to
appropriate resolutions of the Manager, has duly determined to make, execute and
deliver to the Trustee this Fifth Supplemental Indenture to the Indenture as
permitted by Sections 201, 301 and 1401 of the Indenture in order to establish
the form or terms of, and to provide for the creation and issuance of, the
Securities specified in clause (5) of the definition of the "Initial Series"
under the Indenture in an initial aggregate principal amount of $90,000,000
(such series being hereinafter and in the Indenture referred to as the "Initial
Series (5)"); and

WHEREAS, all things necessary to make the Securities of the Initial Series (5),
when executed by the Company and authenticated and delivered by the Trustee or
any Authenticating Agent and issued upon the terms and subject to the conditions
hereinafter and in the Indenture set forth against payment therefor the valid,
binding and legal obligations of the Company and to make this Fifth Supplemental
Indenture a valid, binding and legal agreement of the Company, have been done;

NOW, THEREFORE, THIS FIFTH SUPPLEMENTAL INDENTURE WITNESSETH that, in order to
establish the terms of a series of Securities, and for and in consideration of
the premises and of the covenants contained in the Indenture and in this Fifth
Supplemental Indenture and for other good and valuable consideration the receipt
and sufficiency of which are hereby acknowledged, it is mutually covenanted and
agreed as follows:

<PAGE>

                                   ARTICLE ONE

                        DEFINITIONS AND OTHER PROVISIONS
                             OF GENERAL APPLICATION

         Section 101. Definitions. Each capitalized term that is used herein and
is defined in the Indenture shall have the meaning specified in the Indenture
unless such term is otherwise defined herein.

                                   ARTICLE TWO

                       TITLE, FORM AND TERMS OF THE BONDS

         Section 201. Title of the Bonds. This Fifth Supplemental Indenture
hereby creates a series of Securities designated as the "General Mortgage Bonds,
Series E, due November 1, 2020" of the Company (collectively referred to herein
as the "Bonds"). For purposes of the Indenture, the Bonds shall constitute a
single series of Securities and may be issued in an unlimited principal
aggregate amount, although the initial issuance of the Bonds shall be in the
principal amount of $90,000,000.

         Section 202. Form and Terms of the Bonds. The form and terms of the
Bonds will be set forth in an Officer's Certificate delivered by the Company to
the Trustee pursuant to the authority granted by this Fifth Supplemental
Indenture in accordance with Sections 201 and 301 of the Indenture.

         Section 203. Treatment of Proceeds of Title Insurance Policy. Any
moneys received by the Trustee as proceeds of any title insurance policy on
Mortgaged Property of the Company shall be subject to and treated in accordance
with the provisions of Section 607(2) of the Indenture (other than the last
paragraph thereof).

                                  ARTICLE THREE

                            MISCELLANEOUS PROVISIONS

The Trustee makes no undertaking or representations in respect of, and shall not
be responsible in any manner whatsoever for and in respect of, the validity or
sufficiency of this Fifth Supplemental Indenture or the proper authorization or
the due execution hereof by the Company or for or in respect of the recitals and
statements contained herein, all of which recitals and statements are made
solely by the Company.

Except as expressly amended and supplemented hereby, the Indenture shall
continue in full force and effect in accordance with the provisions thereof and
the Indenture is in all respects hereby ratified and confirmed. This Fifth
Supplemental Indenture and all of its provisions shall be deemed a part of the
Indenture in the manner and to the extent herein and therein provided.

<PAGE>

This Fifth Supplemental Indenture shall be governed by, and construed in
accordance with, the law of the State of New York.

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

<PAGE>

                  IN WITNESS WHEREOF, the parties hereto have caused this Fifth
Supplemental Indenture to be duly executed as of the day and year first above
written.

                                      CENTERPOINT ENERGY HOUSTON ELECTRIC, LLC

                                      By:   /s/ Marc Kilbride
                                         ---------------------------------------
                                         Name:  Marc Kilbride
                                         Title: Vice President and Treasurer

                                      JPMORGAN CHASE BANK, as Trustee

                                      By:   /s/ Rhonda L. Parman
                                         ---------------------------------------
                                         Name:  Rhonda L. Parman
                                         Title: Vice President and Trust Officer

                                 ACKNOWLEDGMENT

STATE OF TEXAS             )
                           )       ss
COUNTY OF HARRIS           )

                  On the 10th day of October 2002, before me personally came
Marc Kilbride, to me known, who, being by me duly sworn, did depose and say that
he resides in Harris County, Texas; that he is the Vice President and Treasurer
of CenterPoint Energy, Houston Electric, LLC, a Texas limited liability company,
the limited liability company described in and which executed the foregoing
instrument; and that he signed his name thereto by authority of the sole manager
of said limited liability company.

                                  /s/ Mary Etta Gaut
                                  ----------------------------------------------
                                  Notary Public

Seal of Notary Public

<PAGE>

                                 ACKNOWLEDGMENT

STATE OF TEXAS             )
                           )       ss
COUNTY OF HARRIS           )

                  On the 10th day of October 2002, before me personally came
Rhonda L. Parman, to me known, who, being by me duly sworn, did depose and
say that she resides in Houston, Texas; that she is Vice President and Trust
Officer of JPMorgan Chase Bank, a banking corporation organized under the state
of New York, the ___________________ described in and which executed the
foregoing instrument; and that she signed her name thereto by authority of the
board of directors of corporation.

                                       /s/ Jeanette C. Dunn
                                       -----------------------------------------
                                       Notary Public

Seal of Notary Public

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