NOTICE DATE: July 8, 2011

NOTICE TYPE: M-B070811-01 Outage Retail/Wholesale

SHORT DESCRIPTION: Planned system maintenance with impacted services

INTENDED AUDIENCE: ERCOT Market Participants

DAY AFFECTED: July 13, 2011, 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 July 13, 2011, 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:

· Report publishing to the ERCOT MIS

· Downloading of extracts and reports from MIS and WebServices.

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].

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