***** EXTERNAL email. Please be cautious and evaluate before you click on links, open attachments, or provide credentials. ***** NOTICE DATE: September 21, 2018 NOTICE TYPE: M-A092118-01 Release - Retail/Wholesale SHORT DESCRIPTION: Implementation of market-facing changes for October 2018 INTENDED AUDIENCE: ERCOT Market Participants DAYS AFFECTED: October 23 - 25, 2018 LONG DESCRIPTION: ERCOT will be implementing a number of market-facing changes in the production environment on October 23 - 25, 2018 for several systems. Please see the attached spreadsheet for the description of each change. ADDITIONAL INFORMATION: ERCOT systems may experience intermittent service interruptions during the implementation period. The systems include, but are not limited to: * Components of the ERCOT Market Information System (MIS) including: o Report publishing to the MIS o Downloading of extracts and reports from MIS and External Web Services (EWS) o MIS and ERCOT.com dashboards and displays Information on upcoming releases can be found on the Project Priority List (PPL)<http://www.ercot.com/services/projects/>. 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 email at [log in to unmask]<mailto:[log in to unmask]>. If you are receiving email from a public 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. sa/mm