1. Information Technology Report Dave Pagliai Manager, IT Support Services October 2015 ERCOT Public

2. 2 October 2015 Incident Report Highlights Service Availability – September Market Data Transparency IT systems met all SLA targets, with the exception of XRetail API (Find ESIID – 97.8%) Incidents & Maintenance – September/October  09/20/15 – UNIX Production frame failure in Taylor data center  09/21/15 – Unplanned Maintenance (Site Failover)  10/02/15 – Planned Maintenance (Site Failover)  10/08/15 – Planned Maintenance (Site Failover – External Web Services)  10/09/15 – Planned Maintenance (Site Failover – MIS)  10/11/15 – Planned Maintenance (Site Failover – ercot.com, MPIM, Retail API)

3. 3 ERCOT PublicOctober 2015 Incident Report Highlights Report NameFrequencyEMIL ID Report Type ID Missed Intervals Number of Intervals Missed Consolidated Transmission Outage ReportChron - Hourly NP3-157-CD13446 20/09/2015 18:00 - 20/09/2015 21:004 Forecasted Temperature Adjusted Dynamic RatingsChron - Hourly NP3-217-CD12346 20/09/2015 18:00 - 20/09/2015 21:004 Hourly Balancing Authority Operations ReportChron - Hourly EIA-930-CD13457 20/09/2015 18:00 - 20/09/2015 21:004 Hourly Resource Outage CapacityChron - Hourly NP3-233-CD13103 20/09/2015 18:00 - 20/09/2015 21:004 Hourly State Estimator Phase Shifter InformationChron - Hourly NP6-622-CD12310 20/09/2015 18:00 - 20/09/2015 21:004 Load Forecast Distribution FactorsChron - Hourly NP4-159-CD12324 20/09/2015 18:00 - 20/09/2015 21:004 NSA Active ConstraintsChron - 5 Minutes when neededNP6-6-CD12305 09/20/2015 17:45 - 09/21/2015 03:30116 NSA Inactive ConstraintsChron - 5 Minutes when neededNP5-911-CD12345 09/20/2015 17:45 - 09/21/2015 03:30116 QSE Ancillary Services Capacity MonitorChron - 5 MinutesNP8-143-CD11025 20/09/2015 17:45 - 20/09/2015 22:1554 Real Time Dynamic Rating DataChron - 15 MinutesNP6-215-CD11024 20/09/2015 17:45 - 20/09/2015 21:4516 RUC Buy-Back Hours Chron - Hourly NP5-513-CD13102 21/09/2015 00:00 - 21/09/2015 06:006 Seven-Day Load Forecast by Forecast ZoneChron - Hourly NP3-560-CD12311 20/09/2015 18:00 - 20/09/2015 21:004 Seven-Day Load Forecast by Weather Zone Chron - Hourly NP3-561-CD12312 20/09/2015 18:00 - 20/09/2015 21:004 Short-Term System Adequacy Report Chron - Hourly NP3-763-CD12315 20/09/2015 18:00 - 20/09/2015 21:004 State Estimator Bus Voltages Chron - Hourly NP6-627-CD13048 20/09/2015 18:00 - 20/09/2015 21:004 State Estimator Load Report - DC Ties Flows Chron - Hourly NP6-626-CD12359 20/09/2015 18:00 - 20/09/2015 21:004 State Estimator Load Report - Total ERCOT Generation Chron - Hourly NP6-625-CD12358 20/09/2015 18:00 - 20/09/2015 21:004 State Estimator Real-Time Transmission Line FlowsChron - 5 MinutesNP6-619-CD12308 20/09/2015 17:45 - 20/09/2015 21:4548 State Estimator Switch StatusChron - Hourly NP6-93-CD12304 20/09/2015 18:00 - 20/09/2015 21:004 System-Wide Demand Chron - Hourly NP6-235-CD12340 20/09/2015 18:00 - 20/09/2015 21:004 Temporarily Removed Contingencies Chron - Hourly NP5-649-CD12352 20/09/2015 18:00 - 20/09/2015 21:004 Topology ConsistencyChron - 5 MinutesNP6-291-CD12309 20/09/2015 17:45 - 20/09/2015 21:4548 Unconfirmed Ancillary Service Trades Chron - Hourly NP4-439-CD13084 20/09/2015 15:00 - 21/09/2015 04:0013 Unconfirmed Capacity Trades Chron - Hourly NP4-437-CD13082 20/09/2015 16:00 - 20/09/2015 23:00 21/09/2015 01:00 - 21/09/2015 03:00 10 Unconfirmed Energy Trades Chron - Hourly NP4-438-CD13083 20/09/2015 18:00 - 21/09/2015 03:009 Wind Generation Resource Power Potential Forecast Chron - Hourly NP4-731-SG12320 20/09/2015 18:00 - 21/09/2015 04:0010 Wind Power Production - Actual 5-minute averaged valuesChron - 5 MinutesNP4-733-CD13071 20/09/2015 17:40 - 20/09/2015 21:4549 Wind Power Production - Hourly averaged actual and forecasted values Chron - Hourly NP4-732-CD13028 20/09/2015 18:00 - 20/09/2015 21:004