1. July 30, 2015 Technical Advisory Committee (TAC) Update to RMS Kathy Scott August 4, 2015 TAC Update to RMS 1

2. ERCOT Board Update June 9, 2015 Board Meeting: ◦ There was no Board meeting this month, but during the June Board meeting the Board approved all revision requests submitted by TAC. ◦ TAC leadership provided an update to Board concerning status of NPRR638 :  Additional analysis and review in progress by the Wholesale Market Subcommittee (WMS). More recent status updates will be provided to the Board during their August 11 th meeting. August 4, 2015TAC Update to RMS2

3. PRS Initiatives and Votes Nodal Protocol Revision Requests (NPRRs) ◦ NPRR684, Remove Annual RUC Impact Report Requirement: TAC Unanimously Approved ◦ NPRR692, Removal of MIS Posting Requirement of DAM Credit Parameters: TAC Unanimously Approved ◦ NPRR693, Incorporation of “Threshold Values for Competitive Constraint Test” into the Protocols: TAC Unanimously Approved ◦ NPRR694, Non-Spin Schedule Requirements: TAC Unanimously Approved ◦ NPRR695, Posting and Notice Requirements for Notifications of Suspension of Operations and Notifications of Change of Generation Resource Designation: TAC Unanimously Approved August 4, 2015TAC Update to RMS3

4. PRS Initiatives and Votes Nodal Protocol Revision Requests (NPRRs) ◦ NPRR699, Energy Offer Curve Caps for Make-Whole Calculations for Resource Type Other: TAC Unanimously Approved ◦ NPRR700, Utilizing Actual Fuel Costs in Startup Offer Caps: TAC Unanimously Approved ◦ NPRR701, As-Built Clarification of NPRR589, Ancillary Service Offers in the Supplemental Ancillary Services Market: TAC Unanimously Approved ◦ NPRR703, Clarification of Disclosure Requirements for GINR Study Information: TAC Unanimously Approved ◦ NPRR706, Restore the ability to use Physical Responsive Reserve Capability as an Indicator of Available Frequency- Responsive Capacity: TAC Unanimously Approved August 4, 2015TAC Update to RMS4

5. PRS Initiatives and Votes Nodal Protocol Revision Requests (NPRRs) ◦ NPRR710, Removal of ORDC Phase 2 Language and Modification to HASL Calculation: TAC Unanimously Approved  Other Binding Document – Methodology for Implementing Operating Reserve Demand Curve (ORDC) to Calculate Real-Time Reserve Price Adder  NOTE: When TAC Approved NPRR710 also included this Unanimous Approval of this Other Binding Document Project Review Discussion (Possible Vote):  What is the proper process for addressing Aging Projects?  Spurred a lot of discussion, comments and suggestions. Action Item: PRS Leadership will develop formal process for TAC’s review and possible approval in the next few months. August 4, 2015TAC Update to RMS5

6. Tabled and/or Withdrawn Revisions Request Previously Tabled at TAC (Possible Vote): ◦ RMGRR129, Revision to Customer Rescission Completion Timeline  RMGRR129 will continue to be “Tabled” at TAC since RMS didn’t meet in July to address and approve MarkeTrak Taskforce’s recommendation for a delayed implementation date as requested by MPs during the May 28, 2015 TAC meeting.  7/30/15: TAC Unanimously Approved to continue to Table RMGRR129 awaiting RMS’ recommendation for an implementation timeline. The RMS recommendation is expected for the August 27 th TAC meeting. August 4, 2015TAC Update to RMS6

7. Reliability Operations Subcommittee (ROS) ◦ NOGRR144, Incorporation of “Manual Deployment and Recall of Responsive Reserve Service during Scarcity Conditions” into the Nodal Operating Guides (Vote)  TAC Unanimously Approved with ERCOT’s July 23, 2015 comments ◦ PGRR043, FIS Scoping Amendment (Vote)  TAC Unanimously Approved as submitted by ROS ◦ PGRR044, MIS Classification of GINR Study Information (Vote)  TAC Unanimously Approved as submitted by ROS ◦ Voltage Reduction Task Force (VRTF) Update:  Scope of VRTF will be reviewed by ROS during their next meeting August 4, 2015TAC Update to RMS7 ROS Initiatives and Votes:

8. 16.11.4.1, Determination of Total Potential Exposure for a Counter-Party – Request to Modify Value of Parameter T5 (Possible Vote) ◦ The way NPRR639 was implemented unintentionally increased the MCE for counter-parties that have both generation and load since it treats all counter-parties that have any load the same. Luminant requested that TAC approve a new value for the T5 Parameters. ◦ Majority of the responses from TAC membership were against making this type of change on the fly without understanding possible long term ramifications created with this change. ◦ Roll Call Voting requested on the Motion to Remand to WMS which includes a request for WMS to consider Luminant’s long term solution.  Vote 25 (Yes), 3 (No), 2 (Abstentions)- Motion Carried August 4, 2015TAC Update to RMS8 Determination of Total Potential Exposure

9. Wholesale Market Subcommittee (WMS)  VCMRR007, Alignment with NPRR699, Energy Offer Curve Caps for Make-Whole Calculations for Resource Type Other (Vote)  Motion to Table VCMRR007 pending Board Approval of NPRR699 was unanimous  VCMRR008, Alignment with NPRR700, Utilizing Actual Fuel Cost in Startup Offer Caps (Vote)  Motion to Table VCMRR008 pending Board Approval of NPRR700 was unanimous Commercial Operations Subcommittee  Update Only  http://www.ercot.com/content/wcm/key_documents_lists/72257/1 0._COPS_UPDATE_TO_TAC_073015.ppt http://www.ercot.com/content/wcm/key_documents_lists/72257/1 0._COPS_UPDATE_TO_TAC_073015.ppt August 4, 2015TAC Update to RMS9 WMS/COPS Initiatives and Votes

10. Retail Market Subcommittee (RMS): ◦ RMGRR130, Alignment of Section 7, Market Processes, with TDSP Terms & Conditions Tariff Effective 01/15/2015, and Adds New Appendix D3, TDSP’s Discretionary Services Timelines Matrix to Section 9, Appendices (Vote)  Motion to Approve RMGRR130 with Just Energy’s July 28, 2015 comments was unanimously approved by TAC  http://www.ercot.com/content/wcm/key_documents_lists/58023/13 0RMGRR_13_Just_Energy_Comments_072815.doc http://www.ercot.com/content/wcm/key_documents_lists/58023/13 0RMGRR_13_Just_Energy_Comments_072815.doc  These changes were implemented and effective on Monday, August 3, 2015. August 4, 2015TAC Update to RMS10 RMS Initiatives and Votes:

11. Ancillary Services Re-design Update Ancillary Services Re-design Update FAS (NPRR 667) ◦ Brattle provided information about their assumptions for the cost benefit analysis. ◦ TAC Leadership suggested as more information is made available to TAC concerning the CBA will require a follow-up workshop or meeting to give Market Participants an opportunity for Q&A.  http://www.ercot.com/content/wcm/key_documents_list s/72257/11._Ancillary_Service_Redesign_Update.zip http://www.ercot.com/content/wcm/key_documents_list s/72257/11._Ancillary_Service_Redesign_Update.zip August 4, 2015TAC Update to RMS11

12. DREAM Taskforce Update DREAM Taskforce Update Distributed Resource Energy and Ancillaries Market Taskforce (DREAM) ◦ Dream Taskforce Leadership (Vote)  Greg Thurnher (Shell) – Chair  Jim Lee (AEP) – Co-Vice Chair  Lance Cunningham (Denton Municipal) – Co-Vice Chair  TAC Unanimously Approved DREAM TF Leadership ◦ DREAM Scope (Vote)  TAC unanimously approved the Scope of Work as revised by TAC.  ERCOT will make all the corrections to change DER TF to DREAM Taskforce offline and create DREAM Taskforce listserv. ◦ DREAM Taskforce Update:  http://www.ercot.com/content/wcm/key_documents_lists/72257/12._DREA M_TF.zip http://www.ercot.com/content/wcm/key_documents_lists/72257/12._DREA M_TF.zip August 4, 2015TAC Update to RMS12

13. Operations, Planning and IT Report A MP reported a EMS system problem on June 22, 2015, ERCOT immediately started their investigation and identified an EMS Coding Issue.  The shift factors being sent to SCED were different than what ERCOT anticipated. This resulted in a different dispatch and pricing. This coding has been in ERCOT’s EMS systems since December 2010 ◦ TAC Leadership voiced concerns that there were no market notices provided by ERCOT reporting this EMS Coding issue.  Brad Jones stated ERCOT had not planned a market notice, but will consider it going forward. ERCOT planned to provide updates to TAC next month and will discuss technical questions at WMS. August 4, 2015TAC Update to RMS13

14. Other Business Working Group/Task Force Leadership Election Discussion ◦ There are no rules around how to conduct elections for Taskforce level leadership voting. ◦ TAC Leadership stated that TAC Procedures would be the appropriate place to formalize the process. TAC should have draft redlined process ready for review for the August TAC meeting. TAC Subcommittee Structural and Procedural Review and TAC Goals Review  August 27, 2015 TAC meeting will include Subcommittee Structural and Procedural and Goals Review following TAC meeting.  Revision Request Alignment with 2015 TAC Goals:  http://www.ercot.com/content/wcm/key_documents_lists/72257/14._Re vision_Request_Alignment_with_2015_TAC_Goals.xlshttp://www.ercot.com/content/wcm/key_documents_lists/72257/14._Re vision_Request_Alignment_with_2015_TAC_Goals.xls August 4, 2015TAC Update to RMS14

15. Other Business ERCOT is considering the addition of a new “Valley Weather Zone”: ◦ ERCOT will need to provide more information to the market on why any new Weather Zone is necessary and provide more market wide visibility into their thought processes. ◦ Market wide communications on this type ERCOT change should include Retail, Commercial and Wholesale Subcommittees since all would be impacted. These subcommittees will need to be involved into the approval process and, if approved, revision request(s) implementation scheduling. August 4, 2015TAC Update to RMS15

16. Questions? 16August 4, 2015TAC update to RMS