*******TEXAS NODAL MARKET NOTICE*******

NOTICE DATE:  August 2, 2010

NOTICE TYPE:  Market Trials

SHORT DESCRIPTION: The 24-Hour Full-System Market and Reliability Test is scheduled to take place on August 4 – 5, 2010

INTENDED AUDIENCE:  Qualified Scheduling Entities, QSEs with Resources, Resource Entities, Nodal Accountable Executives, Nodal Transition Project Managers, Market Trial Contacts

DAYS AFFECTED:  August 4 – 5, 2010

LONG DESCRIPTION:  The 24-Hour Test is scheduled to take place beginning August 4, 2010, at 12:00 CDT and ending August 5, 2010, at 12:00 CDT. Participants should take the following steps:

1. Ensure that support staff are available on August 4, 2010, starting at 08:00 CDT
2. Dial into the WebEx conference bridge (primary LFC contacts/non-control room personnel) at 09:00 CDT:

• The WebEx teleconference information will be provided via email to Nodal Project Managers and technical contacts

3. Await an announcement from ERCOT identifying the test start time:
• This announcement will occur three (3) hours prior to starting the test
• This announcement will be provided via three channels: the WebEx, a Market Notice, and an inter-control center hotline call
4. Prepare your systems for switching Resources to Nodal control when instructed to do so by ERCOT
5. Follow all instructions from the ERCOT control center and resolve issues as needed throughout the testing period
6. Ensure that support staff are available until the testing is complete
• This 24-Hour Test window is scheduled to run through 12:00 CDT on August 5, 2010

ACTION REQUIRED: Please advise operators and other personnel performing Zonal market activities that the necessary support staff will need to be available beginning 08:00 CDT on August 4 and ending 12:00 CDT on August 5, 2010, to support this testing.

CONTACT:  If you have any questions, please contact either the Market Trials team by email at [log in to unmask] or 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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dh