NOTICE DATE: April 8, 2010

NOTICE TYPE: M-A040110-02 CANCELLED: Maintenance Outage – Retail/Wholesale

SHORT DESCRIPTION: ERCOT has cancelled the Maintenance Outage originally planned for Sunday, April 11, 2010 from 06:00 through 21:00.

INTENDED AUDIENCE: All Market Participants

DAY AFFECTED: Sunday, April 11, 2010 from 06:00 through 21:00

LONG DESCRIPTION: ERCOT has cancelled the maintenance outage scheduled for Sunday, April 11, 2010 from 06:00 through 21:00. ERCOT will complete the scheduled maintenance activities at a later date.

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.

DH/DP

_____________________________________________
From: ERCOT Client Relations
Sent: Thursday, April 01, 2010 2:27 PM
To: [log in to unmask]; [log in to unmask]; [log in to unmask]; [log in to unmask]; [log in to unmask]; [log in to unmask]; [log in to unmask]
Cc: [log in to unmask]; [log in to unmask]; [log in to unmask]; 1 ERCOT Client Service Reps
Subject: M-A040110-01 INITIAL: Maintenance Outage - Retail/Wholesale - Sunday, April 11, 2010 from 6:00 AM through 9:00 PM

NOTICE DATE: April 1, 2010

NOTICE TYPE: M-A040110-01 INITIAL: Maintenance Outage – Retail/Wholesale

SHORT DESCRIPTION: Scheduled Maintenance Outage

INTENDED AUDIENCE: All Market Participants

DAY AFFECTED: Sunday, April 11, 2010 from 6:00 AM through 9:00 PM

LONG DESCRIPTION: ERCOT has scheduled a maintenance outage for Sunday, April 11, 2010 from 6:00 AM through 9:00 PM.

ADDITIONAL INFORMATION: During the outage the following functions will be affected:

Market Participants utilizing NAESB to send/receive transactions to/from ERCOT will NOT be able to send/receive transactions to/from ERCOT during the outage. This includes all retail transactions.
867 transactions will NOT be forwarded during the outage.
997 Functional Acknowledgements will NOT be sent during the outage.
Components of the TML and Commercial API will NOT be available including:

Find ESI ID
Find Transaction
Submit Transactions
USA Functionalities
Report Explorer, including

Reports
Extracts
Invoices
Settlement Statements

Extract Scheduler
Web Services Data Requests

ERCOT Internet Services will NOT be available, including but not limited to:

ERCOT.com – www.ercot.com
MarkeTrak - https://marketrak.ercot.com:8443/tmtrack.dll
TCR - https://tcr.ercot.com
Texas Renewables – www.texasrenewables.com

MOS, Scheduling API, MOSTML, MOSPUBLIC, and Outage Scheduler will not be affected as there will be a DNS failover from Taylor to Austin.

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.

JR/DP