NOTICE DATE:  April 3, 2008

NOTICE TYPE:  W-A040308-01   Operations

CLASSIFICATION: Public

SHORT DESCRIPTION:  "Total On-Line Capacity" calculation on the ERCOT
Portal to be corrected

INTENDED AUDIENCE:  All Market Participants

DAY AFFECTED:  April 3, 2008

LONG DESCRIPTION:  ERCOT has determined that the calculation which
provides the Total On-Line Capacity value on the ERCOT Portal
(http://mospublic.ercot.com/ercot/jsp/frequency_control.jsp
<http://mospublic.ercot.com/ercot/jsp/frequency_control.jsp> ) needs to
be revised to exclude self-serve generation.  Until this revision is
made, Total On-Line Capacity may be determined by adding the Total
Generation and Total Spinning Reserve values posted on this portal
display.

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]> .

If you are receiving e-mail from an ERCOT distribution list that you no
longer wish to receive, please follow this link in order to unsubscribe
from this list: http://lists.ercot.com <http://lists.ercot.com/> .

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