NOTICE DATE:  April 13, 2012

NOTICE TYPE:  M-B040512-02 REMINDER:  Maintenance Outage – Retail/Wholesale

SHORT DESCRIPTION:  Scheduled Maintenance Outage

INTENDED AUDIENCE:  All Market Participants

DAY AFFECTED:  Sunday, April 15, 2012 from 06:00 through 21:00

LONG DESCRIPTION:  ERCOT has scheduled a maintenance outage for Sunday, April 15, 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:
  • ERCOT.com – www.ercot.com
  • 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

· Components on ERCOT.com will intermittently NOT be available including:

• Access to Dashboards
• Access to Public Notices

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/JA

305958

From: ERCOT Client Services
Sent: Thursday, April 05, 2012 10:57 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-B040512-01 INITIAL: Maintenance Outage – Retail/Wholesale - Sunday, April 15, 2012 from 06:00 through 21:00

NOTICE DATE:  April 5, 2012

NOTICE TYPE:  M-B040512-01 INITIAL:  Maintenance Outage – Retail/Wholesale

SHORT DESCRIPTION:  Scheduled Maintenance Outage

INTENDED AUDIENCE:  All Market Participants

DAY AFFECTED:  Sunday, April 15, 2012 from 06:00 through 21:00

LONG DESCRIPTION:  ERCOT has scheduled a maintenance outage for Sunday, April 15, 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:
  • ERCOT.com – www.ercot.com
  • 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 – data will not be refreshed during the impacted timeframes
  • Access to Notices
  • 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

· Components on ERCOT.com will intermittently NOT be available including:

• Access to Dashboards
• Access to Public Notices

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/JA

305958