***** EXTERNAL email. Please be cautious and evaluate before you click on links, open attachments, or provide credentials. ***** NOTICE DATE: April 18, 2019 NOTICE TYPE: M-A041219-02 Settlements SHORT DESCRIPTION: Real-Time Market (RTM) Resettlement for Operating Day August 9, 2018 INTENDED AUDIENCE: QSE Settlement Personnel DAY AFFECTED: Operating Day August 9, 2018 LONG DESCRIPTION: ERCOT found an issue in its Settlement system interface which impacted the Real-Time Ancillary Service Supply Responsibility for QSEs (RTASRESP) used in the calculation of Real-Time Ancillary Service Imbalance Amount (RTASIAMT) and Real-Time Reliability Deployment Ancillary Service Imbalance Amount (RTRDASIAMT) for two Operating Days (ODs) -August 9, 2018 and August 19, 2018. This Market Notice is to inform Market Participants that ERCOT is issuing an RTM Resettlement Statement for Operating Day August 9, 2018. Resettlement details are in the tables below. Affected Operating Day August 9, 2018 Description of reason for Resettlement Settlement system interface issue Affected Settlement Charge Types RTASIAMT, LAASIRNAMT, RTEIAMT, LARTRNAMT Publication Date of Previous Settlement Statement February 5, 2019 Publication Date of Resettlement Statement April 18, 2019 Invoice Date of Resettlement Statement April 18, 2019 Resettled Charge Types Resettlement Amount Real-Time Ancillary Service Imbalance Amount (RTASIAMT) $(901.31) Load-Allocated Ancillary Service Imbalance Revenue Neutrality (LAASIRNAMT) $901.21 Real-Time Energy Imbalance Amount (RTEIAMT) $109.34 Real-Time Revenue Neutrality Allocation Amount (LARTRNAMT) $(108.83) ADDITIONAL INFORMATION: Please review the ERCOT website for previous Market Notices<http://www.ercot.com/services/comm/mkt_notices/archives/search?nc=all&per=&pg=&q=M-A041219&sort=> related to this subject. 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