Centerpoint Energy - Mississippi River

Third Revised Volume No. 1

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Effective Date: 12/01/2002, Docket: RP03- 51-000, Status: Effective

First Revised Sheet No. 334 First Revised Sheet No. 334 : Effective

Superseding: Original Sheet No. 334

CenterPoint Energy - Mississippi River Transmission Corporation

APPENDIX TO ELECTRONIC DATA INTERCHANGE

TRADING PARTNER AGREEMENT DATED____________

1. IDENTIFICATION AND ADDRESSES:

----------------------------------

COMPANY NAME

AGENT NAME (IF ANY)

STREET ADDRESS

CITY STATE/PROVINCE/COMMONWEALTH ______

ZIP/POSTAL CODE

ATTENTION

(Name and Title of EDI System Contact)

PHONE FAX E-MAIL

OTHER NOTICE METHOD OR ADDRESS

COMMON CODE IDENTIFIER

COMPANY NAME

AGENT NAME (IF ANY)

STREET ADDRESS

CITY STATE/PROVINCE/COMMONWEALTH ______

ZIP/POSTAL CODE

ATTENTION

(Name and Title of EDI System Contact)

PHONE FAX E-MAIL

OTHER NOTICE METHOD OR ADDRESS

COMMON CODE IDENTIFIER

2. STANDARDS:

---------------

Specify all applicable standards, such as the standards of the American

National Standards Institute. ______

______

3. INDUSTRY GUIDELINES:

-------------------------

Specify all applicable published industry guidelines or applicable

regulations, such as North American Energy Standards Board Version ,

as adopted by the F. E. R. C. ______

4. SECURITY PROCEDURES:

------------------------

(a) Contact for public key exchange:

(b) Method of contact for public key exchange (phone, e-mail etc.):

(c) Method for public key exchange:

(d) Date for submission of scheduled public key exchanges: ______

(e) Scheduled public key exchange procedures, if any: ______

(f) Unscheduled public key exchange procedures: ______

(g) Designated representatives for public key verification: ______

5. METHOD OF TIME-STAMP RESPONSE:

-----------------------------------

6. LIMITATION ON DIRECT DAMAGES TO SOFTWARE AND HARDWARE:

-------------------------------------------------------------Specify, if

any. __________________