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. 337 First Revised Sheet No. 337 : Effective

Superseding: Original Sheet No. 337

CenterPoint Energy - Mississippi River Transmission Corporation

EDI TRADING PARTNER DATA SPECIFICATIONS

LIST OF TRANSACTION DATA SETS

Your Company

Dataset Transaction Description NAESB Version Send/Receive

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

Nominations

Nominations Quick Response

Nominations Request for Confirmation

Nominations Confirmation

Scheduled Quantities

Pre-Determined Allocation (PDA)

Pre-Determined Allocation Quick Response

Allocations

Imbalance Statement

Measurement Information

Transportation/Sales Invoice

Payment Remittance

Statement of Account

Offer of Capacity Release

Bid on Capacity Release

Award of Capacity Release

Capacity Release Withdrawal

Capacity Release Withdrawal Upload

Upload of Pipeline Pre-Arranged Deal (UPPD)

Upload of Pre-Arranged Deal Validation

Pre-Arranged Deal Notification/Req for Confirm

Pre-Arranged Deal Bidder Confirmation

Pre-Arranged Deal Final Disposition

Operationally Available and Unsubscribed

Capacity

Upload of Request for Download of Data

Response to Upload of Req for Download of

Data

Systemwide Notices

Notes/Special Instructions