NOTICE DATE:  April 23, 2009

NOTICE TYPE:  M-D042309-01 Notice of System Change (PRR/SCR)        

SHORT DESCRIPTION:  Implementation of SCR754, Wind Generation Forecast transfer using XML query

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

DAY AFFECTED:  June, 2009

LONG DESCRIPTION:  ERCOT will be implementing an XML query for Qualified Scheduling Entities (QSE’s) representing Wind-powered Generation Resources (WGR) to receive hourly WGR forecasts required per PRR763 and SCR754.  The XML query revision is specified in the attached ERCOT Participant Interface: XML query described in Section 6.5 (Query for AWS Wind Forecast).

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.  The backend processes involve retrieval of AWS forecasts for delivery to QSEs in response to their program queries similar to other services currently supported in zonal.  Additional details are as follows:

·        A new forecast file is received by ERCOT every hour at approximately 20 minutes after the hour.   

• The forecast for each WGRs consists of two different forecast types: a Short-Term Wind Power Forecast (STWPF) and Wind Generation Resource Power Potential (WGRPP).  Both of these forecasts will be made available to the QSE representing the WGR every hour, 24x7 via a XML query by the QSE.

• A QSE will only be able to access the forecasts for those WGRs that it represents.

• Only 1 forecast (consisting of a STWPF and WGRPP for a rolling 48 hours) for a WGR will be accessible by the QSE at any given time.  This forecast will be from the latest forecast file received by ERCOT from the wind generation forecasting vendor, AWS.

• The QSEs are not to attempt to retrieve forecast data at a frequency of more than 10 times in a given hour.

Tests are planned to begin with QSEs in the zonal Market Operations Test Environment (MOTE) after May 22, 2009 in preparation for migration to production, slated for the second half of June, 2009.  Each QSE representing WGRs is encouraged to test and prove their XML query in the MOTE prior to production migration. A notice for the MOTE testing period will be sent separately. A final market notice will be sent to all QSE’s 10-days prior to actual production migration.

ACTION REQUIRED:  Implement the ERCOT Participant Interface: XML query described in Section 6.5 (Query for AWS Wind Forecast) of the attached document by May 22, 2009 to prepare for MOTE testing.

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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