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

NOTICE DATE: September 3, 2010

NOTICE TYPE: Market Trials

SHORT DESCRIPTION: Nodal dispute API test window available

INTENDED AUDIENCE: Nodal Accountable Executives, Nodal Transition Project Managers, Market Trial Contacts

DAYS AFFECTED: September 7 – 28, 2010

LONG DESCRIPTION: A test window is now available for Qualified Scheduling Entities (QSEs) to submit test Nodal disputes via Application Programmatic Interface (API). Market Participants, who plan to test their API dispute submittals, please notify [log in to unmask] to declare your intent. The ERCOT Registration Team will send a confirmation email that the QSE has been activated in the ERCOT dispute system. Based on the table below, test disputes for the listed Operating Dates can be submitted for the Day-Ahead Market (DAM), Real-Time Market (RTM) Initial and RTM Final on or after the Posting Date. But, the final date to submit test API disputes is September 28, 2010.

	Operating Date	Posting Date
DAM	9/9/2010	9/13/2010
RTM Initial	8/27/2010	9/7/2010
RTM Final	8/27/2010	9/16/2010

ADDITIONAL INFORMATION: Any submitted test disputes will not be validated or researched by ERCOT. This is simply a test of the dispute submittal process. More technical information about the Dispute API can be found in section 11 of the “EIP - External Interfaces Specification v1.19O” located under Key Documents on the ERCOT nodal website at: http://nodal.ercot.com/readiness/sandbox/index.html.

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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