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/> . yl