***** EXTERNAL email. Please be cautious and evaluate before you click on links, open attachments, or provide credentials. ***** NOTICE DATE: October 13, 2017 NOTICE TYPE: M-A101317-01 Operations SHORT DESCRIPTION: Notification of Suspension of Operations for LUMINANT GENERATION COMPANY LLC (RE) – Sandow Unit 4 (SDSES_UNIT 4) INTENDED AUDIENCE: ERCOT Market Participants DAY AFFECTED: January 11, 2018 LONG DESCRIPTION: ERCOT received a Notification of Suspension of Operations (NSO) for the following Generation Resource: * Sandow Unit 4 (SDSES_UNIT 4) The NSO indicates that Luminant Generation Company LLC (Luminant) will decommission and retire the above-referenced Generation Resource permanently on January 11, 2018. The NSO further identifies the Generation Resource as having the following summer Seasonal Net Max/Minimum Sustainable Ratings: Generation Resource Seasonal Net Max Sustainable Rating (MW) Seasonal Net Minimum Sustainable Rating (MW) Sandow Unit 4 (SDSES_UNIT 4) 600 310 A copy of the NSO is posted under the Notice of Suspension of Operations portlet on the Grid/Generation<https://mis.ercot.com/pps/tibco/mis/Pages/Grid+Information/Generation> page of the ERCOT Market Information System (MIS) Secure Area. An ERCOT Digital Certificate is required to access the MIS. ACTION REQUIRED: Please send any comments you may have regarding this NSO to [log in to unmask]<mailto:[log in to unmask]>, with “Luminant (SDSES_UNIT 4) NSO Application” in the subject line. Comments are due no later than October 27, 2017. All comments will be posted to the Grid/Generation<https://mis.ercot.com/pps/tibco/mis/Pages/Grid+Information/Generation> page of the MIS Secure Area. 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 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. mm