***** EXTERNAL email. Please be cautious and evaluate before you click on links, open attachments, or provide credentials. ***** NOTICE DATE: May 13, 2019 NOTICE TYPE: W-B051319-01 Operations SHORT DESCRIPTION: Railroad DC Tie Operations change to Oncor on Operating Day May 16, 2019 INTENDED AUDIENCE: Qualified Scheduling Entities (QSEs) and Transmission Operators (TOs) DAY AFFECTED: May 16, 2019 LONG DESCRIPTION: As of May 16, 2019, Oncor Electric Delivery Company LLC ("Oncor") will be the Transmission Operator for Railroad DC Tie Operations. Beginning on Operating Day May 16, 2019, DC Tie Schedules (E-Tags) submitted on the Railroad DC Tie must include Oncor (ONC) as the Transmission Provider (TP) in the Physical Path for E-Tag approval. E-Tags submitted after Operating Day, May 15, 2019, for the Railroad DC Tie with Sharyland Utilities, L.P. included as the TP will be denied. ACTION REQUIRED: Railroad DC Tags submitted on or after Operating Day May 16, 2019, must include Oncor (ONC) as the TP in the Physical Path for E-Tag approval. ADDITIONAL INFORMATION: Please refer to the DC Tie Operations Procedure<http://www.ercot.com/mktrules/guides/procedures> on the ERCOT Website. 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