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] <mailto:[log in to unmask]> .

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