ERCOT Load, Wind Gen, Conventional Gen. Week Starting Day of GMT, WeekSunday, Jan. 05, ERCOT 3Wind Gen (Percent 4 of Load) 5 6 7

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1 Texas Synchrophasor Network, Report for the Week Beginning January 5, 14 Introduction There have been many uninteresting weeks recently, but this was not one of them. Temperatures dropped most of Sunday into the s, and Monday morning into the teens. Sweetwater and the rest of the West Texas high plains dropped to F or lower with calm wind. After a slight peak in wind at about 6am Monday morning, wind generation dropped throughout Monday to less than, which was mostly from coastal wind farms along the Gulf of Mexico. Unusually low temperatures across the northern half of Texas created a high demand, aggravated by four generator trips, which drove generation reserves slightly negative (see kink at 7am CST). Neighbors, including Mexico, were shipping power to us via the DC ties. Monday was a rough ride for ERCOT. 1. Weekly Load, Wind, and Phase Angles 6 5 ERCOT Load, Wind Gen, Conventional Gen Week Starting. GMT, Sunday, Jan. 5, 14 New winter peak 4 Load Wind Conv ERCOT 3Wind Gen (Percent 4 of Load) Week Starting Day. of GMT, WeekSunday, Jan. 5, Degrees F Sweetwater 3 Temperature Week Beginning Sunday, Day of Jan. Week 5, 14, : GMT Page 1 of Day of Week

2 Texas Synchrophasor Network, Report for the Week Beginning January 5, Weekly Load, Wind, and Phase Angles, cont. Degrees wrt MPH ERCOT Wind Gen Week Starting. GMT, Sunday, Jan. 5, Day of Week Average Voltage Phase Angle at onald Observatory and U.T. Pan Am 1-Minute Intervals, Beginning Sunday, Jan. 5, 14, : GMT Hour of the Week, GMT Sweetwater Wind Speed Week Beginning Sunday, Jan. 5, 14, : GMT Day of Week Page 2 of 9

3 Texas Synchrophasor Network, Report for the Week Beginning January 5, Frequency Plots for the Week The ERCOT emergency period is boxed below. It appears that the other two grids also had some lower than normal frequency periods. 6.1 Minimum Frequency 1-Minute Intervals, Beginning Sunday, Jan. 5, 14, : GMT Hour of the Week, GMT Omaha, Nebraska Area, Eastern Grid, Minimum Frequency 1-Minute Intervals, Beginning Sunday, Jan. 5, 14, : GMT Signal lost 6.1 Cloudcroft, NM, Minimum Frequency 1-Minute Intervals, Beginning Sunday, Jan. 5, 14, : GMT Internet dropouts at the Cloudcroft mountain cabin cause the sparse appearance of this graph, and sometimes snow (elevation = 77 feet) covers the GPS antenna. Page 3 of 9

4 Texas Synchrophasor Network, Report for the Week Beginning January 5, ERCOT s 12 Hour Emergency Period The rest of the report addresses the 12-hour emergency period. Comments are placed on the graphs. 12 Hours, Monday Morning, Jan. 6, 14, A Rough Ride for ERCOT Post Emergency Description from Jan :29:14 CST On 1/6/14, a sudden loss of generation occurred at : totaling 474. Frequency declined to 59.91, ERCOT load was 44,97. At 6:4, a sudden loss of generation occurred totaling 464. Frequency declined to 59.91, ERCOT load was 53,258. At 6:31, a sudden loss of generation occurred totaling 892. Frequency declined to HZ, ERCOT load was 55,574. At 8:11, a sudden loss of generation occurred totaling 91. Frequency declined to , ERCOT load was 55,54. Jan :47:26 CST Jan :56:19 CST Jan :8:58 CST Jan :53:38 CST ERCOT Messages Logged During the Event ERCOT is issuing a Watch for Physical Responsive Capability less than 25. ERCOT at EEA 1 Reserves below 2. No rotating outages at this time. EEA Level 2: At 7:5, ERCOT at EEA 2 Reserves below 175. Load resources are being deployed. There may be a need to implement rotating outages. ERCOT is urging consumers and businesses to reduce electricity usage. EEA Level 2 to Level 1: At 7:51, ERCOT moving from EEA 2 to EEA 1. System recovering. No rotating outages at this time. Operational Information Emergency Notice Emergency Notice Emergency Notice Jan :18: CST Jan :57:38 CST ERCOT moving from EEA 1 to Normal. Grid reserves restored. Normal conditions Conservation encouraged ERCOT has cancelled the following notice: ERCOT is issuing a Watch for Physical Responsive Capability less than 25. Emergency Notice Operational Information Page 4 of 9

5 6 Texas Synchrophasor Network, Report for the Week Beginning January 5, Hours, Monday Morning, Jan. 6, 14, A Rough Ride for ERCOT ERCOT Load 12 Hours, Midnight to Noon, Monday, Jan. 6, 14, Central Standard Time 5 4 Cold Snap, Temperatures in the Teens, Very High Load Hour of Week GMT ERCOT Wind 12 Hours, Midnight to Noon, Monday, Jan. 6, 14, Central Standard Time West Texas Wind Dies Out, Leaving Only Coastal Wind ERCOT 35 Capacity-to-Load Ratio Hours, Midnight to Noon, Hour Monday, of Week Jan. GMT 6, 14, Central Standard Time ERCOT 35 DC 36 Export Hours, Midnight to Noon, Hour Monday, of Week Jan. GMT 6, 14, Central Standard Time Hour of Week Page 5 of 9

6 Texas Synchrophasor Network, Report for the Week Beginning January 5, Hour Rough Ride, Jan. 6, 14, cont. 6 ERCOT Load 12 Hours, Midnight to Noon, Monday, Jan. 6, 14, Central Standard Time Top graph repeated from previous page 5 MPH Sweetwater Hour of Week Wind GMT Speed 12 Hours, Midnight to Noon, Jan. 6, 14, Central Standard Time 15 5 Cold Snap, Temperatures in the Teens, Very High Load Sweetwater Wind Speed Drops to Zero 6.1 Minimum Frequency 12 Hours Beginning Midnight, Monday, Jan. 6, 14, Central Standard Time Trips Average Voltage Phase Angle at onald Observatory and U.T. Pan Am 12 Hours Beginning Midnight, Monday, Jan. 6, 14, Central Standard Time Degrees wrt Hour of the Week, GMT Page 6 of 9

7 Texas Synchrophasor Network, Report for the Week Beginning January 5, 14 Rough Ride, cont. 1-Minute of Frequencies for Each Trip Frequency Jan. 6, 14, : CST Event Frequency Jan. 6, 14, 6:4 CST Event Frequency Jan. 6, 14, 6:39 CST Event Frequency Jan. 6, 14, 8: CST Event Page 7 of 9

8 Texas Synchrophasor Network, Report for the Week Beginning January 5, 14 Rough Ride, cont. 1-Minute of Voltage Phase Angles for Each Trip Degrees Relative to Degrees Relative to Degrees Relative to Voltage Phase Angle Jan. 6, 14, : CST Event Voltage Phase Angle Jan. 6, 14, 6:4 CST Event Voltage Phase Angle Jan. 6, 14, 6:39 CST Event Apparently during these two events, the grid just did not feel much like ringing Degrees Relative to 5 4 Voltage Phase Angle Jan. 6, 14, 8: CST Event Page 8 of 9

9 Texas Synchrophasor Network, Report for the Week Beginning January 5, 14 Rough Ride, cont. 1-Minute of Voltage Magnitudes for Each Trip 1.1 Voltage Magnitude Jan. 6, 14, : CST Event 474 PU Voltage Magnitude Jan. 6, 14, 6:4 CST Event PU Voltage Magnitude Jan. 6, 14, 6:39 CST Event PU Voltage Magnitude Jan. 6, 14, 8: CST Event 91 PU Page 9 of 9