Public Notices

    This section contains public market notifications required by protocols as well as other market messages ERCOT may post for market transparency. Notices are categorized by types and can be filtered by selecting the desired category. ERCOT began archiving public notices November 3, 2011.

    Dec 2017 Jan 2018 Feb 2018 Mar 2018 Apr 2018 May 2018
    Date Message Type Status
    May 26 2018 02:15:47 CST No sudden loss of generation greater than 450 MW occurred on May 25, 2018. Operational Information Active
    May 25 2018 17:39:25 CST ERCOT has cancelled the following notice: The B_DAVIS RAS has been taken out of service. Operational Information Cancelled
    May 25 2018 11:16:47 CST The B_DAVIS RAS has been taken out of service. Operational Information Active
    May 25 2018 10:58:13 CST ERCOT has cancelled the following notice: The Barney Davis RAS has been taken out of service/removed from RTCA. Operational Information Cancelled
    May 25 2018 08:48:12 CST The Daily RSASM for Friday, May 25, 2018 will not be occurring due to zero participating QSEs. Operational Information Active
    May 25 2018 02:08:44 CST The Barney Davis RAS has been taken out of service/removed from RTCA. Operational Information Active
    May 25 2018 01:03:20 CST No sudden loss of generation greater than 450 MW occurred on May 24, 2018. Operational Information Active
    May 24 2018 16:33:23 CST The Barney Davis RAS has been returned to service. Operational Information Active
    May 24 2018 14:31:22 CST Frequency Measurable Events: Report tracking Frequency Measurable Events (FMEs) as of May 24, 2018 is available. Operational Instruction Active
    May 24 2018 12:14:27 CST ERCOT has cancelled the following notice: The Railroad DC Tie will be unavailable from 07:00 05/24/2018 through 17:00 05/24/2018 due to a planned outage. Operational Information Cancelled
    May 24 2018 12:14:16 CST ERCOT has cancelled the following notice: The Railroad DC Tie will be unavailable from 07:00 05/24/2018 through 17:00 05/24/2018 due to a planned outage. Operational Information Cancelled
    May 24 2018 08:48:04 CST The Daily RSASM for Thursday, May 24, 2018 will not be occurring due to zero participating QSEs. Operational Information Active
    May 24 2018 01:40:02 CST No sudden loss of generation greater than 450 MW occurred on May 23, 2018. Operational Information Active
    May 23 2018 09:01:26 CST At 09:00, ERCOT is issuing an OCN for extreme hot weather with forecasted temperatures above 94 degrees in the ERCOT Region from 05/25/20018-05/31/2018. Operational Information Active
    May 23 2018 08:51:33 CST The Daily RSASM for Wednesday, May 23, 2018 will not be occurring due to zero participating QSEs. Operational Information Active
    May 23 2018 01:49:31 CST No sudden loss of generation greater than 450 MW occurred on May 22, 2018. Operational Information Active
    May 22 2018 13:54:58 CST Notification of Market Price Correction: Market price correction for SCED. ERCOT has identified a need for price correction for Real-Time Market Settlement Intervals 15:45 on OD 05/21/2018 due to a site failover. Only EPS meters were impacted. There was no impact to Real-Time Settlement Point Prices. Corrections to the EPS meter price will be finished by 16:00 of 05/23/2018. Since ERCOT does not post price corrections for RTRMPRs, this price correction will be reflected on the settlement statement of the QSE who was impacted. Alert Active
    May 22 2018 10:31:52 CST On 05/21/2018 a sudden loss of generation occurred at 04:00 totaling 493.90MW. Frequency declined to 59.943Hz. ERCOT load was 30921MW. Another sudden loss of generation occurred at 08:06 totaling 468.89MW. Frequency declined to 59.887Hz. ERCOT load was 38186MW. Operational Information Active
    May 22 2018 08:47:51 CST The Daily RSASM for Tuesday, May 22, 2018 will not be occurring due to zero participating QSEs. Operational Information Active
    May 22 2018 00:29:32 CST On 05/21/2018 a sudden loss of generation occurred at 03:40 totaling 493.90MW. Frequency declined to 59.943Hz. ERCOT load was 30921MW. Another sudden loss of generation occurred at 08:06 totaling 468.89MW. Frequency declined to 59.887Hz. ERCOT load was 38186MW. Operational Information Active
    May 21 2018 15:44:29 CST ERCOT Emergency Base Points are Disabled Operational Information Cancelled
    May 21 2018 15:42:21 CST ERCOT Emergency Base Points are Enabled Operational Information Active
    May 21 2018 13:18:14 CST DC Tie Outage: The Railroad DC Tie will be unavailable from 07:00 05/24/2018 through 17:00 05/24/2018 due to a planned outage. Operational Information Active
    May 21 2018 10:54:00 CST At 3:25 PM on 05/21/2018, ERCOT will perform site failover of its Energy Market Management Systems. During this time, market communications will be unavailable for about 20 minutes, and real-time communications will be unavailable for about 5 minutes. All systems should re-establish communications automatically. This event will be preceded by a "hot line" call shortly before beginning. Operational Information Active
    May 21 2018 08:46:56 CST The Daily RSASM for Monday, May 21, 2018 will not be occurring due to zero participating QSEs. Operational Information Active
    May 21 2018 08:09:59 CST ERCOT Responsive Reserve Has Been Recalled Operational Information Cancelled
    May 21 2018 08:06:31 CST ERCOT Responsive Reserve Has Been Deployed Operational Information Active
    May 21 2018 06:53:05 CST For June 2018 The minimum monthly Ancillary Services quantities have been posted to the ERCOT Market Information System (MIS) under the Projected Ancillary Service Requirements link under the Medium-Term System Adequacy heading. The posted quantities reflect minimum requirements only. ERCOT will follow-up with a Notification if any upward adjustments to these minimum quantities are made. https://mis.ercot.com/pps/tibco/mis/Pages/Grid+Information/Forecasts AS Postings Active
    May 21 2018 02:31:19 CST ERCOT has cancelled the following notice: Transmission Watch due to the loss of the Laredo VFT Tie and curtailment of schedules. Operational Information Cancelled
    May 21 2018 02:29:55 CST ERCOT has cancelled the following notice: Transmission Watch due to the loss of the Laredo VFT Tie and curtailment of schedules. Operational Information Cancelled
    May 21 2018 01:15:45 CST Transmission Watch due to the loss of the Laredo VFT Tie and curtailment of schedules. Operational Information Active
    May 21 2018 00:01:04 CST No sudden loss of generation greater than 450 MW occurred on May 20, 2018. Operational Information Active
    May 20 2018 08:56:40 CST The Daily RSASM for Sunday, May 20, 2018 will not be occurring due to zero participating QSEs. Operational Information Active
    May 20 2018 00:05:51 CST No sudden loss of generation greater than 450 MW occurred on May 19, 2018. Operational Information Active
    May 19 2018 08:48:37 CST The Daily RSASM for Saturday, May 19, 2018 will not be occurring due to zero participating QSEs. Operational Information Active
    May 19 2018 00:00:18 CST No sudden loss of generation greater than 450 MW occurred on May 18, 2018. Operational Information Active
    May 18 2018 18:59:37 CST ERCOT has cancelled the following notice: 10:00 ERCOT is issuing an OCN for extreme hot weather with forecasted temp above 94 degrees in the North Central and South Central Weather Zones from 05/17/20018-05/18/2018. Operational Information Cancelled
    May 18 2018 08:46:57 CST The Daily RSASM for Friday, May 18, 2018 will not be occurring due to zero participating QSEs. Operational Information Active
    May 18 2018 01:41:49 CST No sudden loss of generation greater than 450 MW occurred on May 17, 2018 Operational Information Active
    May 17 2018 20:12:12 CST ERCOT has cancelled the following notice: At 1614 a Transmission Watch was issued due to the post-contingency overload of Fredericksburg-Phillips Gillespie 69KV line. A temporary outage action plan (TOAP) is being developed. Operational Information Cancelled
    May 17 2018 16:25:27 CST At 1614 a Transmission Watch was issued due to the post-contingency overload of Fredericksburg-Phillips Gillespie 69KV line. A temporary outage action plan (TOAP) is being developed. Operational Information Active
    May 17 2018 08:47:39 CST The Daily RSASM for Thursday, May 17, 2018 will not be occurring due to zero participating QSEs. Operational Information Active
    May 17 2018 01:24:16 CST No sudden loss of generation greater than 450 MW occurred on May 16, 2018 Operational Information Active
    May 16 2018 08:54:28 CST The Daily RSASM for Wednesday, May 16, 2018 will not be occurring due to zero participating QSEs. Operational Information Active
    May 16 2018 01:29:18 CST No sudden loss of generation greater than 450 MW occurred on May 15, 2018 Operational Information Active
    May 16 2018 01:29:03 CST No sudden loss of generation greater than 450 MW occurred on May 14, 2018 Operational Information Active
    May 15 2018 18:13:42 CST ERCOT has cancelled the following notice: 08:50 EROCOT is issuing an OCN for Projected Capacity Reserve Shortage for HE 14-18. Operational Information Cancelled
    May 15 2018 08:58:13 CST 08:50 EROCOT is issuing an OCN for Projected Capacity Reserve Shortage for HE 14-18. Operational Information Active
    May 15 2018 08:47:47 CST The Daily RSASM for Tuesday day, May 15, 2018 will not be occurring due to zero participating QSEs. Operational Information Active
    May 15 2018 08:33:40 CST ERCOT has cancelled the following notice: The East DC Tie will be unavailable from 08:00 05/15/2018 through 16:00 05/16/2018 due to a planned outage. Operational Information Cancelled
    May 14 2018 12:30:23 CST ERCOT has cancelled the following notice: 10:45 ERCOT is issuing a Transmission Watch for the Rio Grande Valley due to the Rio Grande Valley Import, this may result in the curtailment of DC-Ties. Operational Information Cancelled
    May 14 2018 10:47:49 CST 10:45 ERCOT is issuing a Transmission Watch for the Rio Grande Valley due to the Rio Grande Valley Import, this may result in the curtailment of DC-Ties. Operational Information Active
    May 14 2018 10:09:09 CST 10:00 ERCOT is issuing an OCN for extreme hot weather with forecasted temp above 94 degrees in the North Central and South Central Weather Zones from 05/17/20018-05/18/2018. Operational Information Active
    May 14 2018 08:46:49 CST The Daily RSASM for Monday, May 14, 2018 will not be occurring due to zero participating QSEs. Operational Information Active
    May 14 2018 00:01:49 CST No sudden loss of generation greater than 450 MW occurred on May 13, 2018. Operational Information Active
    May 13 2018 14:37:01 CST The Laredo DC tie has ended its forced outage and is back in service 14:25 Operational Information Active
    May 13 2018 14:34:56 CST ERCOT has cancelled the following notice: At 04:25, ERCOT is issuing a Transmission Watch for the DC_L due to Laredo Tie tripping offline. This may result in the curtailment of DC-Tie exports to CENACE. Watch Cancelled
    May 13 2018 14:29:23 CST ERCOT has cancelled the following notice: The Laredo DC Tie will be unavailable from 04:25 05/13/2018 through 18:00 05/14/2018 due to a forced outage. Operational Information Cancelled
    May 13 2018 08:55:29 CST The Daily RSASM for Sunday, May 13, 2018 will not be occurring due to zero participating QSE Operational Information Active
    May 13 2018 06:42:51 CST DC Tie Outage: The Laredo DC Tie will be unavailable from 04:25 05/13/2018 through 18:00 05/14/2018 due to a forced outage. Operational Information Active
    May 13 2018 04:32:18 CST At 04:25, ERCOT is issuing a Transmission Watch for the DC_L due to Laredo Tie tripping offline. This may result in the curtailment of DC-Tie exports to CENACE. Watch Active
    May 13 2018 00:08:40 CST No sudden loss of generation greater than 450 MW occurred on May 12, 2018. Operational Information Active
    May 12 2018 13:31:24 CST The North DC tie has ended its planned outage and is back in service. Operational Information Active
    May 12 2018 13:29:45 CST ERCOT has cancelled the following notice: The North DC Tie will be unavailable from 09:23 04/16/2018 through 13:00 05/12/2018 due to a forced outage. Operational Information Cancelled
    May 12 2018 11:59:36 CST DC Tie Outage: The East DC Tie will be unavailable from 08:00 05/15/2018 through 16:00 05/16/2018 due to a planned outage. Operational Information Active
    May 12 2018 08:46:47 CST The Daily RSASM for Saturday, May 12, 2018 will not be occurring due to zero participating QSEs. Operational Information Active
    May 12 2018 00:02:46 CST No sudden loss of generation greater than 450 MW occurred on May 11, 2018. Operational Information Active
    May 11 2018 21:23:52 CST DC Tie Outage: The North DC Tie will be unavailable from 09:23 04/16/2018 through 13:00 05/12/2018 due to a forced outage. Operational Information Active
    May 11 2018 08:47:26 CST The Daily RSASM for Friday, May 11, 2018 will not be occurring due to zero participating QSEs. Operational Information Active
    May 11 2018 04:29:32 CST ERCOT is working from primary control center. Operational Information Active
    May 11 2018 00:13:35 CST No sudden loss of generation greater than 450 MW occurred on May 10, 2018. Operational Information Active
    May 10 2018 17:04:52 CST Frequency Measurable Events: Report tracking Frequency Measurable Events (FMEs) as of May 10, 2018 is available. Operational Instruction Active
    May 10 2018 08:47:45 CST The Daily RSASM for Thursday, May 10, 2018 will not be occurring due to zero participating QSEs. Operational Information Active
    May 10 2018 00:09:14 CST No sudden loss of generation greater than 450 MW occurred on May 9, 2018. Operational Information Active
    May 09 2018 19:05:31 CST ERCOT has cancelled the following notice: Transmission Watch for the League City, Texas City area due to multiple forced outages in the area. Operational Information Cancelled
    May 09 2018 16:10:12 CST Transmission Watch for the League City, Texas City area due to multiple forced outages in the area. Operational Information Active
    May 09 2018 08:47:33 CST The Daily RSASM for Wednesday, May 9, 2018 will not be occurring due to zero participating QSEs. Operational Information Active
    May 09 2018 00:01:03 CST No sudden loss of generation greater than 450 MW occurred on May 8, 2018. Operational Information Active
    May 08 2018 14:22:18 CST DAM is complete, DRUC will begin at 1515. Operational Information Active
    May 08 2018 12:46:03 CST ERCOT has postponed the deadline for the posting of the DAM Solution for Operating Day 5/9/2018 due to long run solution. Please wait for further message once DAM completes. Advisory Active
    May 08 2018 08:47:55 CST The Daily RSASM for Tuesday, May 8, 2018 will not be occurring due to zero participating QSEs. Operational Information Active
    May 08 2018 00:01:13 CST No sudden loss of generation greater than 450 MW occurred on May 7, 2018. Operational Information Active
    May 07 2018 20:43:13 CST ERCOT will execute a SASM at 2100 for operating day 05/08/2018 for REGDN HE 01-09 3.6 MW REGDN HE 10-12 3.7 and REGUP HE 01-12 8.8 MW. Operational Information Active
    May 07 2018 08:46:35 CST The Daily RSASM for Monday, May 7, 2018 will not be occurring due to zero participating QSEs. Operational Information Active
    May 07 2018 00:19:29 CST No sudden loss of generation greater than 450 MW occurred on May 6, 2018. Operational Information Active
    May 06 2018 08:49:56 CST The Daily RSASM for Sunday May 6, 2018 will not be occurring due to zero participating QSEs. Operational Information Active
    May 06 2018 00:33:57 CST On 5/5/2018, a sudden loss of generation occurred at 16:19 totaling 539 MW. Frequency declined to 59.874Hz, ERCOT load was 44, 227 MW. Operational Information Active
    May 05 2018 20:51:59 CST ERCOT has cancelled the following notice: ERCOT has been notified that the RAILROAD DC Tie has been de-rated to 150 MW Import/Export until further notice. Operational Information Cancelled
    May 05 2018 20:02:21 CST ERCOT has cancelled the following notice: 17:30 a Transmission Watch has been issued due to the post-contingency overload of DELMTEX5, a mitigation plan/temporary outage action plan is being developed. Watch Cancelled
    May 05 2018 17:37:33 CST 17:30 a Transmission Watch has been issued due to the post-contingency overload of DELMTEX5, a mitigation plan/temporary outage action plan is being developed. Watch Active
    May 05 2018 16:23:10 CST ERCOT Responsive Reserve Has Been Recalled Operational Information Cancelled
    May 05 2018 16:19:10 CST ERCOT Responsive Reserve Has Been Deployed Operational Information Active
    May 05 2018 08:46:30 CST The Daily RSASM for Saturday May 5, 2018 will not be occurring due to zero participating QSEs. Operational Information Active
    May 05 2018 00:07:52 CST ERCOT has cancelled the following notice: At 5:25 PM on 05/02/2018, ERCOT will perform site failover of its Energy Market Management Systems. During this time, market communications will be unavailable for about 20 minutes, and real-time communications will be unavailable for about 5 minutes. All systems should re-establish communications automatically. This event will be preceded by a "hot line" call shortly before beginning. Operational Information Cancelled
    May 05 2018 00:07:44 CST ERCOT has cancelled the following notice: At 5:25 PM on 05/03/2018, ERCOT will perform site failover of its Energy Market Management Systems. During this time, market communications will be unavailable for about 20 minutes, and real-time communications will be unavailable for about 5 minutes. All systems should re-establish communications automatically. This event will be preceded by a "hot line" call shortly before beginning. Operational Information Cancelled
    May 05 2018 00:05:31 CST No sudden loss of generation greater than 450 MW occurred on May 4, 2018. Operational Information Active
    May 04 2018 09:38:36 CST Notification of Market Price Correction: Market price correction for SCED. ERCOT has identified a need for price correction for Real-Time Market Settlement Intervals 17:45 on OD 05/02/2018 due to an unplanned site failover. Only EPS meters were impacted. There was no impact to Real-Time Settlement Point Prices. Corrections to the EPS meter price will be finished by 16:00 of 05/04/2018. Since ERCOT does not post price corrections for RTRMPRs, this price correction will be reflected on the settlement statement of the QSE who was impacted. Alert Active
    May 04 2018 08:47:04 CST The Daily RSASM for Friday May 4, 2018 will not be occurring due to zero participating QSEs. Operational Information Active
    May 04 2018 00:35:40 CST No sudden loss of generation greater than 450 MW occurred on May 3, 2018. Operational Information Active
    May 03 2018 23:55:27 CST ERCOT has cancelled the following notice: The Mitchell Bend Switch RAS has been taken out of service. Operational Information Cancelled
    May 03 2018 17:44:22 CST ERCOT Emergency Base Points are Disabled Operational Information Cancelled
    May 03 2018 17:37:01 CST ERCOT Emergency Base Points are Enabled Operational Information Active
    May 03 2018 16:47:11 CST At 0440 ERCOT will be working from the primary control center until further notice, use the OPX numbers for Taylor. Operational Information Active
    May 03 2018 16:01:35 CST CM-ASM-NOTF AS_TYPE: Non-Spin, DEPLOY_MW: 0.0, BEGIN_TIME: 2018-05-03 16:01:34, END_TIME: 2018-05-03 16:01:34, DURATION: 0 Hrs 0 Mins.; Market Message
    May 03 2018 11:25:39 CST At 5:25 PM on 05/03/2018, ERCOT will perform site failover of its Energy Market Management Systems. During this time, market communications will be unavailable for about 20 minutes, and real-time communications will be unavailable for about 5 minutes. All systems should re-establish communications automatically. This event will be preceded by a "hot line" call shortly before beginning. Operational Information Active
    May 03 2018 08:47:49 CST The Daily RSASM for Thursday May 3, 2018 will not be occurring due to zero participating QSEs. Operational Information Active
    May 03 2018 04:56:21 CST CM-ASM-NOTF AS_TYPE: Non-Spin, DEPLOY_MW: 14.2, BEGIN_TIME: 2018-05-03 05:00:00, END_TIME: 2018-05-03 22:00:00, DURATION: 17 Hrs 0 Mins.; Market Message
    May 03 2018 01:33:25 CST CM-ASM-NOTF AS_TYPE: Non-Spin, DEPLOY_MW: 2.3, BEGIN_TIME: 2018-05-03 01:33:25, END_TIME: 2018-05-03 08:00:00, DURATION: 6 Hrs 26 Mins.; Market Message
    May 03 2018 00:30:20 CST No sudden loss of generation greater than 450 MW occurred on May 2, 2018. Operational Information Active
    May 02 2018 23:23:49 CST The Mitchell Bend Switch RAS has been taken out of service. Operational Information Active
    May 02 2018 22:00:56 CST CM-ASM-NOTF AS_TYPE: Non-Spin, DEPLOY_MW: 0.0, BEGIN_TIME: 2018-05-02 22:00:55, END_TIME: 2018-05-02 22:00:55, DURATION: 0 Hrs 0 Mins.; Market Message
    May 02 2018 17:43:22 CST ERCOT Emergency Base Points are Disabled Operational Information Cancelled
    May 02 2018 17:37:02 CST ERCOT Emergency Base Points are Enabled Operational Information Active
    May 02 2018 16:41:01 CST ERCOT will be working from the alternate control center until further notice, use the OPX numbers for Bastrop. Operational Information Active
    May 02 2018 11:28:07 CST At 5:25 PM on 05/02/2018, ERCOT will perform site failover of its Energy Market Management Systems. During this time, market communications will be unavailable for about 20 minutes, and real-time communications will be unavailable for about 5 minutes. All systems should re-establish communications automatically. This event will be preceded by a "hot line" call shortly before beginning. Operational Information Active
    May 02 2018 09:41:13 CST CM-ASM-NOTF AS_TYPE: Non-Spin, DEPLOY_MW: 66.0, BEGIN_TIME: 2018-05-02 09:41:12, END_TIME: 2018-05-02 23:59:00, DURATION: 14 Hrs 17 Mins.; Market Message
    May 02 2018 08:46:37 CST The Daily RSASM for Wednesday May 2, 2018 will not be occurring due to zero participating QSEs Operational Information Active
    May 02 2018 08:00:01 CST CM-ASM-NOTF AS_TYPE: Non-Spin, DEPLOY_MW: 0.0, BEGIN_TIME: 2018-05-02 08:00:01, END_TIME: 2018-05-02 08:00:01, DURATION: 0 Hrs 0 Mins. ; Market Message
    May 02 2018 00:40:59 CST No sudden loss of generation greater than 450 MW occurred on May 1, 2018. Operational Information Active
    May 02 2018 00:03:04 CST ERCOT Emergency Base Points are Disabled Operational Information Cancelled
    May 02 2018 00:02:24 CST ERCOT Emergency Base Points are Enabled Operational Information Active
    May 01 2018 23:54:00 CST CM-ASM-NOTF AS_TYPE: Non-Spin, DEPLOY_MW: 64.3, BEGIN_TIME: 2018-05-02 00:00:00, END_TIME: 2018-05-02 08:00:00, DURATION: 8 Hrs 0 Mins.; Market Message
    May 01 2018 23:54:00 CST CM-ASM-NOTF AS_TYPE: Non-Spin, DEPLOY_MW: 64.3, BEGIN_TIME: 2018-05-02 00:00:00, END_TIME: 2018-05-02 08:00:00, DURATION: 8 Hrs 0 Mins.; Market Message
    May 01 2018 21:59:29 CST CM-ASM-NOTF AS_TYPE: Non-Spin, DEPLOY_MW: 45.8, BEGIN_TIME: 2018-05-01 22:00:00, END_TIME: 2018-05-01 23:59:00, DURATION: 1 Hrs 59 Mins.; Market Message
    May 01 2018 19:46:44 CST CM-ASM-NOTF AS_TYPE: Non-Spin, DEPLOY_MW: 85.7, BEGIN_TIME: 2018-05-01 20:00:00, END_TIME: 2018-05-01 23:59:00, DURATION: 3 Hrs 59 Mins.; Market Message
    May 01 2018 17:49:45 CST CM-ASM-NOTF AS_TYPE: Non-Spin, DEPLOY_MW: 22.6, BEGIN_TIME: 2018-05-01 18:00:00, END_TIME: 2018-05-01 23:59:00, DURATION: 5 Hrs 59 Mins.; Market Message
    May 01 2018 17:46:14 CST CM-ASM-NOTF AS_TYPE: Non-Spin, DEPLOY_MW: 22.6, BEGIN_TIME: 2018-05-01 17:46:14, END_TIME: 2018-05-01 18:00:00, DURATION: 0 Hrs 13 Mins.; Market Message
    May 01 2018 12:45:03 CST ERCOT has been notified that the RAILROAD DC Tie has been de-rated to 150 MW Import/Export until further notice. Operational Information Active
    May 01 2018 08:46:53 CST The Daily RSASM for Tuesday May 1, 2018 will not be occurring due to zero participating QSEs Operational Information Active
    May 01 2018 00:04:10 CST No sudden loss of generation greater than 450 MW occurred on April 30, 2018. Operational Information Active