1 EPS Metering Holiday Work Schedules RMS & COPS Don Tucker September 9 & 10, 2014

2 TDSP Notification by ERCOT of Communication Problems with EPS Meters Settlement Metering Process  Notify the Transmission and/or Distribution Service Provider (TDSP) repair contact via phone and e- mail as soon as reasonably possible. Note: the TDSP repair contact was established by the TDSP in response to an request from ERCOT. ERCOT may issue such a notification on a Business Day or on a Saturday where weekends and ERCOT holidays result in four consecutive days that are not Business Days. The target time frame for such a notification is  Business Day  Monday through Friday, excluding observed holidays listed below:  (a) New Year’s Day;  (b) Memorial Day;  (c) Independence Day;  (d) Labor Day;  (e) Thanksgiving Thursday and Friday; and  (f) Two days at Christmas, as designated from time to time by the ERCOT CEO.

3 EPS Metering Holiday Work Schedules THANKSGIVING 2014 ERCOT HOLIDAY MONTUESWEDTHURFRISATSUNMONTUES 11/24/201411/25/201411/26/201411/27/201411/28/201411/29/201411/30/201412/1/201412/2/2014 OD MDAS Process 11/24 OD 12-Hour Notices MDAS Process 11/24 OD 6-Hour Notices Data Agg Run for 11/24 OD OD MDAS Process 11/25 OD 12-Hour Notices Data Agg Run for 11/25 OD MDAS Process 11/25 OD 6-Hour Notices OD MDAS Process 11/26 OD 6-Hour Notices Data Agg Run for 11/26 OD OD MDAS Process 11/27 OD 12-Hour Notices Data Agg Run for 11/27 OD MDAS Process 11/27 OD 6-Hour Notices OD MDAS Process 11/28 OD 12-Hour Notices Data Agg Run for 11/28 OD WORK DAY OD = Operating DayFull range of functions; Comms Issues (Meter notices) Event Handling Validation Issues

4 EPS Metering Holiday Work Schedules CHRISTMAS 2014 ERCOT HOLIDAY MONTUESWEDTHURFRISATSUNMONTUES 12/22/201412/23/201412/24/201412/25/201412/26/201412/27/201412/28/201412/29/201412/30/2014 OD MDAS Process 12/22 OD 12-Hour Notices MDAS Process 12/22 OD 6-Hour Notices Data Agg Run for 12/22 OD OD MDAS Process 12/23 OD 12-Hour Notices Data Agg Run for 12/23 OD MDAS Process 12/23 OD 6-Hour Notices OD MDAS Process 12/24 OD 6-Hour Notices Data Agg Run for 12/24 OD OD MDAS Process 12/25 OD 12-Hour Notices Data Agg Run for 12/25 OD MDAS Process 12/25 OD 6-Hour Notices OD MDAS Process 12/26 OD 12-Hour Notices Data Agg Run for 12/26 OD WORK DAY OD = Operating DayFull range of functions; Comms Issues (Meter notices) Event Handling Validation Issues