4/15/2018 No PMU Report 0.095 59.909 0:11:54 349 29,628 18% 180,352 1:11 Created 4/18/2018 No PMU Report 0.097 59.914 0:07:34 460 38,487 33% 225,994 10:20 Created 0.81 12% 4/21/2018 0.249 59.719* 0:03:38 1250 36,486 32% 190,214 17:11 0.75 13% 4/28/2018 No PMU Report 0.069 59.904 0:00:59 299 34,434 13% 216,030 9:50 Created 4/28/2018 No PMU Report 0.103 59.910 0:09:23 408 43,739 15% 234,444 18:15 Created *This is the lowest frequency seen by ERCOT EMS. High speed data recorders shows frequency went as low as 59.709Hz. (Note: All data on this graph encompasses frequency event analysis based on BAL-001-TRE-1.) Responsive Reserve Events There were three events where Responsive Reserve MWs were released to SCED in April. The events highlighted in blue were related to frequency events reported in Section 2.1 above. Date and Time Date and Time Duration of Maximum Comments Released to SCED Recalled Event MWs Released 4/15/2018 1:11 4/15/2018 1:14 308 0:02:44 Of the 1548MW of RRS requested, 1298MW came from PFR while the remainder was 4/21/2018 17:11 4/21/2018 17:15 1548 0:03:40 expected from Load Resources. 546.5MW of Load Resources tripped offline to provide their RRS obligation. 4/28/2018 9:50 4/28/2018 9:51 287 0:00:56 Load Resource Events Date and Time Date and Time Duration of Maximum Comments Released Recalled Event MW At approximately 17:11 on 4/21/2018 17:11 4/21/2018 17:30 0:19:00 546.5 04/21/2018, 1,250 MW of
4/15/2018 1:11 0.095 59.909 0:11:54 No PMU Report Created 349 29,628 18% 180,352 4/18/2018 10:20 0.097 59.914 0:07:34 No PMU Report Created 460 38,487 33% 225,994 4/21/2018 17:11 0.249 59.719* 0:03:38 0.81 12% 1250 36,486 32% 190,214 0.75 13% 4/28/2018 9:50 0.069 59.904 0:00:59 No PMU Report Created 299 34,434 13% 216,030 4/28/2018 18:15 0.103 59.910 0:09:23 No PMU Report Created 408 43,739 15% 234,444 *This is the lowest frequency seen by ERCOT EMS. High speed data recorders shows frequency went as low as 59.709Hz. (Note: All data on this graph encompasses frequency event analysis based on BAL-001-TRE-1.) Responsive Reserve Events There were three events where Responsive Reserve MWs were released to SCED in April. The events highlighted in blue were related to frequency events reported in Section 2.1 above. Date and Time Released to SCED Date and Time Recalled Duration of Event Maximum MWs Released Comments 4/15/2018 1:11 4/15/2018 1:14 0:02:44 308 4/21/2018 17:11 4/21/2018 17:15 0:03:40 1548 Of the 1548MW of RRS requested, 1298MW came from PFR while the remainder was expected from Load Resources. 546.5MW of Load Resources tripped offline to provide their RRS obligation. 4/28/2018 9:50 4/28/2018 9:51 0:00:56 287 Load Resource Events Date and Time Released Date and Time Recalled Duration of Event Maximum MW Comments 4/21/2018 17:11 4/21/2018 17:30 0:19:00 546.5 At approximately 17:11 on 04/21/2018, 1,250 MW of
05._April_18_ERCOT_Operations_Report_Public.docx