NOTICE DATE: March 11, 2011

NOTICE TYPE: W-B031111-01 Extracts – Wholesale

SHORT DESCRIPTION: Inaccurate values provided in the Mid-Term Load Forecast data sets

INTENDED AUDIENCE: ERCOT Market Participants

DAY AFFECTED: March 11, 2011

LONG DESCRIPTION: Due to manual operator overrides within our operating systems, the provided values of the Mid-Term Load Forecast was incorrect in both the West and Far West zones between 09:00 and 23:00 on March 11, 2011. ERCOT’s Energy Management System (EMS) was using the correct calculations, only the presented value to the Market was incorrect in the reports and dashboards.

This information is accessed through the following data points:

· NP3-560-CD Seven Day Load Forecast by Forecast Zone

· NP3-561-CD Seven Day Load Forecast by Weather Zone

· Nodal Control Area Historical Load

· Load Forecast vs Actual Dashboard on MIS

· EWS Forecasted Load

ADDITIONAL INFORMATION: A defect has been written to address the presented values for manual overrides going forward. The updated values will be provided to the Market in a follow-up Notice.

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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