1. DSWG Market Data Needs Update Eric Rothschild, GDS Associates 11/2/2012

2. 2 Updates from Oct MISUG Proration NPRR: ERCOT MIS made revisions; MIS agreed to sponsor and introduce to PRS this month Market Data Needs: 351 Enhancements & Database/list of advisories and watches will require System Change Request. MISUG will draft SCR Miscellaneous: AS Dashboard, ERCOT web revamp System Adequacy Reporting: MIS put together summary (next 3 slides) 11/02/2012

3. 3 System Adequacy Reporting 11/02/2012 EMIL IDName Freq Which Forecast What’s Included Traceability NP3-560-CD 7 Day Load Forecast by Forecast Zone  Forecast by Forecast Zone Hourly Next 168 Hours Short-Term NP3.2.3(3)(c) NP3.2.2(3) NP3-561-CD 7 Day Load Forecast by Weather Zone  Forecast by Weather Zone Hourly Next 168 Hours Short-Term NP3.2.2(3) NP3-763-CDShort Term System Adequacy (a)For Generation Resources, the available On-Line Resource capacity for each hour, using the COP for the first seven days; (b)For Load Resources, the available capacity for each hour using the COP; (c)Forecast Demand for each hour described in Section 3.2.2; (d)Ancillary Service requirements for the Operating Day and subsequent days; and (e)Transmission constraints that have a high probability of being binding in SCED or DAM given the forecasted system conditions for each week including the effects of any transmission or Resource Outages. The binding constraints may not be updated every hour. Hourly Next 168 Hours Short-Term Hourly Daily Hourly NP3.2.3(3)(a-e) (c) NP3-560-CD 7 Day Load Forecast by Forecast Zone (d) NP4-33-CD DAM Ancillary Service Plan (e) NP6-86-CD SCED Shadow Prices and Binding Transmission Constraints

4. 4 System Adequacy Reporting 11/02/2012 NP3-775-M36 Month Resource Capacity Report (Medium Term Sys Adequacy) (a) Generation Resource capacity at the time of forecasted weekly peak Demand; (b) Load Resource capacity at the time of the forecasted weekly peak Demand; (c) Weekly peak forecast Demand described in Section 3.2.2, Demand Forecasts; (d) Calculated system reserve, highlighting any deficiency hours, that excludes Load Resource capacity; (e) Calculated system reserve, highlighting any deficiency hours, that includes Load Resource capacity shown as a reduction in forecast Demand; (f)Ancillary Service requirements; and (g)Transmission constraints that have a high probability of being binding in the Security-Constrained Economic Dispatch (SCED) or Day-Ahead Market (DAM) given the forecasted system conditions for each week excluding the effects of any transmission or Resource Outages. Monthly Next 36 Months Long-Term Monthly Monthly Monthly Daily Monthly Monthly Monthly Monthly NP3.2.3(2)(a,b,d,e,g) 36 Month Resource Capacity Report 36 Month Resource Capacity Report (c) NP3-760-M Long Term Weekly Peak Demand Forecast (d) NP4-33-CD DAM Ancillary Service Plan 36 Month Resource Capacity Report (f) NP3-782-M Projected AS Service Requirements (g) NP3-776-M Projected Trans Constraints for Medium Term PASA AND NP3-775-M 36 Month Resource Capacity Report

5. 5 System Adequacy Reporting 11/02/2012 EMIL IDNameFrequency/Forecast ZP12-400-SGShort Term LF; Mid Term LF ZP8-803Availability of Resources for Short Term PASA ZP8-807Availability of Resources for Medium Term PASA Other: SARA (Seasonal Assessment Resource Adequacy) not on MIS or required by protocol

6. 6 Questions 11/02/2012