NOTICE DATE: August 20, 2008 NOTICE TYPE: R-D082008-01 - Informational: Retail Processing CLASSIFICATION: Public SHORT DESCRIPTION: AEP will submit 658,844 814_20 Maintain transactions. This will create a high number of 814_20s being sent from ERCOT to the affected CRs. INTENDED AUDIENCE: AEP and CRs DAY AFFECTED: Beginning August 26, 2008 LONG DESCRIPTION: Beginning Tuesday, August 26, 2008, AEP will begin sending 814_20 transactions to update the Station ID Assignments at ERCOT. The total number of transactions to be sent is 658,844. These 814_20s will be sent on the date and in the quantity identified in the attached file (Schedule for Sending 814_20 Messages.doc). ERCOT has asked that the 814_20s be sent after 5:00 PM Central Standard Time, and that Saturday submissions be excluded. Therefore, CRs should expect to receive transactions late in the day Tuesdays through Fridays only. ADDITIONAL DETAILS: Additional black out dates are as follows: Date Day of Week Reason for Blackout 18-Sep Thurs Annual Validation 19-Sep Fri Annual Validation 23-Sep Tues Annual Validation 24-Sep Wed Annual Validation 25-Sep Thur Annual Validation 26-Sep Fri Annual Validation CONTACT: If you have any questions, please contact your ERCOT Account Manager. You may also call the general ERCOT Client Services phone number at (512) 248-3900 or contact ERCOT Client Services via e-mail at [log in to unmask] If you are receiving e-mail from an ERCOT distribution list that you no longer wish to receive, please follow this link in order to unsubscribe from this list: http://lists.ercot.com <http://lists.ercot.com/> . <<Schedule for Sending 814_20 Messages.doc>> JR/JA