***** EXTERNAL email. Please be cautious and evaluate before you click on links, open attachments, or provide credentials. ***** NOTICE DATE: December 5, 2017 NOTICE TYPE: W-B120517-01 Operations SHORT DESCRIPTION: Notification of Change of Generation Resource Designations for NRG Texas Power LLC – SRB_SRB_G3, SRB_SRB_G4, and SRB_SRBGT_2 INTENDED AUDIENCE: ERCOT Market Participants DAY AFFECTED: December 31, 2017 LONG DESCRIPTION: On December 5, 2017, ERCOT received a Notification of Change of Generation Resource Designation (NCGRD) for the following Generation Resources: * NRG Texas Power LLC – SRB_SRB_G3 * NRG Texas Power LLC – SRB_SRB_G4 * NRG Texas Power LLC – SRB_SRBGT_2 The NCGRD states these Generation Resources, which are currently under a mothballed status, will change to a status of decommissioned and retired permanently as of December 31, 2017. ADDITIONAL INFORMATION: Pursuant to ERCOT Protocols Section 3.14.1.9(2), ERCOT has posted the notifications in the list titled “Notice of Change of Generation Resource Designation” on the Generation page<https://mis.ercot.com/pps/tibco/mis/Pages/Grid+Information/Generation> of the Market Information System (MIS) Secure Area. An ERCOT Digital Certificate is required to access the MIS. 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. sa