NOTICE DATE: May 2, 2008 NOTICE TYPE: M-A050208-01 Operations CLASSIFICATION: Public SHORT DESCRIPTION: Implementation schedule for nodal market transition activities INTENDED AUDIENCE: All Market Participants DAY AFFECTED: See below LONG DESCRIPTION: In accordance with Protocol Section 21.12.2, Notice to Market Participants of Activities Essential for Nodal Market Open, ERCOT is providing an update of the implementation schedules for the following nodal market transition activities. Nodal Market Design Activity Target Date Single entry Network Model July 14, 2008 Initiation of the 168-hour testing September 1, 2008 Completion of 168-hour test October 1, 2008 First congestion revenue rights monthly auction November 17, 2008 Real-time market implementation December 1, 2008 Day-ahead market implementation December 8, 2008 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] 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/> . cd