NOTICE DATE:  May 28, 2008

NOTICE TYPE:  W-A052808-01 Operations

CLASSIFICATION: Public

SHORT DESCRIPTION: The Real-Time CSC Limit Calculator will be used on a full-time basis in the ERCOT control room.

INTENDED AUDIENCE:  QSE Operations Personnel

DAY AFFECTED:  May 28, 2008

LONG DESCRIPTION:  The Real-Time CSC Limit Calculator was placed into service on full-time basis in the ERCOT control room beginning May 28, 2008.

Background

The CSC Limits are computed and posted by Operations during the day-ahead planning process.  These limits are based on the day ahead Resource Plans and forecasted system conditions.  ERCOT has experienced periods in real-time where the flow across the CSCs are  below the day ahead limits but there are post contingency overloads appearing in the ERCOT Real-Time Contingency Analysis (RTCA).   There has also been times when the flow across the CSCs are exceeding the day ahead limits but there are no post contingency overloads in RTCA.  ERCOT has frequently updated the limits under this scenario but has not been able to keep up with the changes to the system because of the manual process required to update the limits.  The CSC Limit Calculator will automate this process and allow ERCOT to update the limits as often as once an hour. 

Benefits

The Real-Time CSC Limit Calculator will allow ERCOT to update the limits on the CSC in a more timely manner and allow ERCOT to maximize the flow across zones.

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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