NOTICE DATE: June 11, 2009

NOTICE TYPE: M-D042309-02 Notice of System Change (PRR/SCR)

SHORT DESCRIPTION: Implementation of SCR 754, Replace Email Delivery of WGRPP Forecasts – MOTE Testing

INTENDED AUDIENCE: Resource Entities with Wind-powered Generation Resources and QSEs

DAY AFFECTED: June 24, 2009

LONG DESCRIPTION: ERCOT has implemented an XML query for Qualified Scheduling Entities (QSEs) representing Wind-powered Generation Resources (WGR) to download hourly WGR forecasts required per PRR 763 and SCR 754. The XML query as specified in the ERCOT Participant Interface: XML query Section 6.5 (Query for AWS Wind Forecast) was sent through a market notice on April 23, 2009.

The implementation is intended to remedy the limitations of email delivery of AWS wind generation forecasts to QSEs by employing zonal infrastructure and processes for production quality 7x24 delivery.

Each QSE representing WGRs is encouraged to test and prove their XML query in the ERCOT Zonal Market Operations Test Environment (MOTE) at this time in preparation for migration to the production system for normal data queries. Migration to the production system is scheduled for June 24, 2009.

The URL for MOTE is https://mostest.ercot.com/ercot-xml/servlet/Listener. You will need a digital certificate from ERCOT Client Services to access MOTE. A test data set is available in MOTE.

ACTION REQUIRED: Implement the ERCOT Participant Interface: XML query described in Section 6.5 (Query for AWS Wind Forecast) for MOTE testing at this time.

ADDITIONAL INFORMATION: The current method of email delivery of AWS forecasts will remain until all QSE’s with WGRs are able to retrieve the forecasts using the XML query.

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 e-mail at [log in to unmask].

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