NOTICE DATE: June 3, 2011

NOTICE TYPE: M-B060311-01 Outage Retail/Wholesale

SHORT DESCRIPTION: Planned system maintenance with impacted services

INTENDED AUDIENCE: ERCOT Market Participants

DAY AFFECTED: June 8, 2011, 19:00 – 23:00 CDT

LONG DESCRIPTION: ERCOT will be performing planned system maintenance of the Market Information System (MIS), Current Day Reports (CDR) databases and applications on June 8, 2011, within a maintenance window of 19:00 – 23:00 CDT. During this system maintenance, the below list of market services will be intermittently unavailable for about two hours.

During the outage, Market Participants may experience intermittent issues 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 19:00 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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