NOTICE
DATE:
October 22, 2008
NOTICE
TYPE:
M-B102208-01 Operations
SHORT
DESCRIPTION:
New Methodologies for Determining Ancillary Services effective November 1, 2008
INTENDED
AUDIENCE:
ERCOT Market Participants
DAY
AFFECTED:
November 1, 2008
LONG
DESCRIPTION:
On October 21, 2008, the ERCOT Board of Directors (Board) approved the new
ERCOT Methodologies for Determining Ancillary Service (AS) Requirements
document for 2008-2009. The two affected Ancillary Services are Regulation Reserve
(RGS) and Non-Spin Reserve Service (NSRS).
Two
changes were made to the method for determining RGS. First, the increase
in installed wind capacity on the ERCOT System and it’s affect on RGS is
taken into account when studying the historical data used to determine the
upcoming requirements. This was a recommendation that came out of the GE
study that was performed for ERCOT. The second change is a provision that
allows ERCOT to increase the amount of the RGS if ERCOT begins to observe lower
than desired CPS1 scores.
For
NSRS, the procurement will no longer be a flat 1354 MW around peak Load hours
depending on temperature forecasts. Instead, the requirement for each hour
during the Operating Day will take into consideration historical errors in the
Mid-Term Load Forecast (MTLF) and the Wind Forecasts that are being provided to
ERCOT.
The
methodologies described in the document will be used to calculate the AS
requirements starting November 1, 2008.
ADDITIONAL
INFORMATION:
Please refer to the following link for the approved document and other
supporting documentation:
ERCOT - Board of
Directors Meeting(October 21, 2008). The item in the link pertaining
to this notice is 7d.
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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are receiving e-mail from an ERCOT distribution list that you no longer wish to
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