NOTICE DATE:  April 12, 2013

NOTICE TYPE:  M-A041213-01 Outage - Retail/Wholesale

SHORT DESCRIPTION:  Planned system maintenance with impacted services

INTENDED AUDIENCE:  ERCOT Market Participants

DAY AFFECTED:  April 15, 2013, 16:30 - 21:30 CDT

LONG DESCRIPTION:  ERCOT will be performing planned system maintenance of the Market Information System (MIS), Current Day Reports (CDR), and Market Information Repository (MIR) databases and applications on April 15, 2013, within a maintenance window of 16:30 - 21:30 CDT.

During this outage window, Market Participants may experience intermittent issues for approximately two hours with the following services:

*         Market submissions and requests via WebServices, Market Manager and Outage Scheduler

*         Report publishing to the ERCOT MIS

*         Downloading of extracts and reports from MIS and WebServices

*         Net Dependable Capability and Reactive Capability (NDCRC)

During the outage, please use the following URLs to directly access the Market Manager and Outage Scheduler:

*       https://mis.ercot.com/mmsui/mmsui/displayTradesLanding.action
*       https://mis.ercot.com/osrui/osrui/Summary.action.

Note that the two hour outage is scheduled to begin at approximately 16:30 CDT; however, this start time may be delayed depending on the current system conditions.

ADDITIONAL INFORMATION:  Reports will be rerun and reposted as applicable. The MIS Dashboards and ERCOT.com price displays will not be populated with data during this timeframe.

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 email at [log in to unmask]<mailto:[log in to unmask]>.



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