The ERCOT planned maintenance outage completed at approximately 18:52 this evening, Sunday, May 6, 2012. All systems and transaction processing were reinstated at that time.

As always, connectivity issues such as NAESB or MIS can be reported to the ERCOT Help Desk at 512-248-6800 or [log in to unmask] or tomorrow to your ERCOT Account Manager.

From: ERCOT Client Services
Sent: Friday, May 04, 2012 9:47 AM
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-A042712-02 REMINDER: Maintenance Outage – Retail/Wholesale - Sunday, May 6, 2012 from 06:00 through 21:00

NOTICE DATE: May 4, 2012

NOTICE TYPE: M-A042712-02 REMINDER: Maintenance Outage – Retail/Wholesale

SHORT DESCRIPTION: Scheduled Maintenance Outage

INTENDED AUDIENCE: All Market Participants

DAY AFFECTED: Sunday, May 6, 2012 from 06:00 through 21:00

LONG DESCRIPTION: ERCOT has scheduled a maintenance outage for Sunday, May 6, 2012 from 06:00 through 21:00.

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.

ERCOT Internet Services may be intermittently unavailable, including but not limited to:
- MarkeTrak - https://marketrak.ercot.com:8443/tmtrack.dll
- Texas Renewables – www.texasrenewables.com
Retail Application components of the MIS will NOT be available.
Components of the MIS will intermittently NOT be available including:
- Access to Dashboards
- Downloading of extracts and reports
- Access to Applications

· Market Manager (MMUI), and Outage Scheduler (OSUI) will need to be accessed via the following URLs:

o https://mis.ercot.com/mmsui/mmsui/displayTradesLanding.action

o https://mis.ercot.com/osrui/osrui/Summary.action

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/DH

315752

From: ERCOT Client Services
Sent: Friday, April 27, 2012 3:39 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-A042712-01 INITIAL: Maintenance Outage – Retail/Wholesale - Sunday, May 6, 2012 from 06:00 through 21:00

NOTICE DATE: April 27, 2012

NOTICE TYPE: M-A042712-01 INITIAL: Maintenance Outage – Retail/Wholesale