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

NOTICE DATE:  August 16, 2010

NOTICE TYPE:  Market Trials

SHORT DESCRIPTION: REMINDER – The second 24-Hour Full-System Market and Reliability Test is scheduled to take place beginning on August 19, 2010

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

DAYS AFFECTED:  August 19 – 20, 2010

LONG DESCRIPTION:  This Notice is to remind Market Participants that the second 24-Hour Test is scheduled to take place beginning August 19, 2010, at 12:00 CDT and ending August 20, 2010, at 12:00 CDT. Participants should take the following steps:

1. Ensure that support staff are available on August 19, 2010, starting at 08:00 CDT
2. Dial into the WebEx conference bridge (primary 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
• The second 24-Hour Test window is scheduled to run through 12:00 CDT on August 20, 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 19 and ending 12:00 CDT on August 20, 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