- Home
- Services
- Market Participant Communications
- Operations Messages
Operations Messages
This section contains important messages from the ERCOT Control Room. Refresh this screen to see current operation messages.
| Dec 2025 | Jan 2026 | Feb 2026 | Mar 2026 | Apr 2026 | May 2026 |
| Date & Time | Notice | Type | Status |
|---|---|---|---|
| May 23, 2026 7:57:19 AM | ERCOT has cancelled the following notice: The DC_N (North) DC Tie will be unavailable from 05/23/2026 07:22 through 05/23/2026 23:59 due to a forced outage. | Operational Information | Cancelled |
| May 23, 2026 7:27:34 AM | The DC_N (North) DC Tie will be unavailable from 05/23/2026 07:22 through 05/23/2026 23:59 due to a forced outage. | Operational Information | Active |
| May 23, 2026 12:01:05 AM | No sudden loss of generation greater than 450 MW occurred on May 22, 2026. | Operational Information | Active |
| May 22, 2026 1:36:34 PM | ERCOT has cancelled the following notice: The DC_L (Laredo VFT) DC Tie will be unavailable from 05/19/2026 07:00 through 05/22/2026 17:00 due to a forced outage. | Operational Information | Cancelled |
| May 22, 2026 12:00:22 AM | No sudden loss of generation greater than 450 MW occurred on May 21, 2026. | Operational Information | Active |
| May 21, 2026 10:38:29 AM |
End of ERCOT Emergency Notification Test At 10:38, the test of the ERCOT Emergency Notification System ended. |
Emergency Notice | Active |
| May 21, 2026 10:33:19 AM |
ERCOT Emergency Notification Test At 10:33, this is a test of the ERCOT Emergency Notification System. No action is required. |
Emergency Notice | Active |
| May 21, 2026 12:16:12 AM | On May 20, 2026, a sudden loss of generation occurred at 23:17 totaling 781 MW. Frequency declined to 59.948 Hz, ERCOT load was 54,289 MW. | Operational Information | Active |
| May 21, 2026 12:15:31 AM | ERCOT has cancelled the following notice: On May 20, 2026, a sudden loss of generation occurred at 23:17 totaling 781 MW. Frequency declined to 59.948 Hz, ERCOT load was 54,298 MW. | Operational Information | Cancelled |
| May 21, 2026 12:14:00 AM | On May 20, 2026, a sudden loss of generation occurred at 23:17 totaling 781 MW. Frequency declined to 59.948 Hz, ERCOT load was 54,298 MW. | Operational Information | Active |
| May 20, 2026 11:28:42 PM | ERCOT has cancelled the following notice: ERCOT is taking manual action for an unsolved contingency in the Taylor County area. | Operational Information | Cancelled |
| May 20, 2026 11:11:06 PM | ERCOT is taking manual action for an unsolved contingency in the Taylor County area. | Operational Information | Active |
| May 20, 2026 12:16:41 AM | No sudden loss of generation greater than 450 MW occurred on May 19, 2026. | Operational Information | Active |
| May 20, 2026 12:15:17 AM | ERCOT has cancelled the following notice: The DC_L (Laredo VFT) DC Tie is being curtailed, a DC Tie Curtailment Notice (DCTCN) is active due to a planned or unplanned outage | DC Tie Curtailment Notice | Cancelled |
| May 19, 2026 1:31:14 PM | ERCOT has cancelled the following notice: The DC_L (Laredo VFT) DC Tie will be unavailable from 05/19/2026 07:00 through 05/19/2026 12:00 due to a planned outage. | Operational Information | Cancelled |
| May 19, 2026 11:11:47 AM | The DC_L (Laredo VFT) DC Tie is being curtailed, a DC Tie Curtailment Notice (DCTCN) is active due to a planned or unplanned outage | DC Tie Curtailment Notice | Active |
| May 19, 2026 11:10:46 AM | The DC_L (Laredo VFT) DC Tie will be unavailable from 05/19/2026 07:00 through 05/22/2026 17:00 due to a forced outage. | Operational Information | Active |
| May 19, 2026 6:52:47 AM | The DC_L (Laredo VFT) DC Tie will be unavailable from 05/19/2026 07:00 through 05/19/2026 12:00 due to a planned outage. | Operational Information | Active |
| May 19, 2026 2:14:06 AM | ERCOT has cancelled the following notice: ERCOT is taking manual action for an unsolved contingency in the Taylor County area. | Operational Information | Cancelled |
| May 19, 2026 12:03:13 AM | No sudden loss of generation greater than 450 MW occurred on May 18, 2026. | Operational Information | Active |
| May 18, 2026 12:02:04 AM | No sudden loss of generation greater than 450 MW occurred on May 17, 2026. | Operational Information | Active |
| May 17, 2026 1:29:54 PM | ERCOT has identified the following MIS posting as delayed for Operating Day 05/18/2026: DAM Shift Factors. The report will be published after 13:30. | Operational Information | Active |
| May 17, 2026 12:00:55 AM | No sudden loss of generation greater than 450 MW occurred on May 16, 2026. | Operational Information | Active |
| May 16, 2026 12:01:11 AM | No sudden loss of generation greater than 450 MW occurred on May 15, 2026. | Operational Information | Active |
| May 15, 2026 5:53:08 PM | ERCOT has cancelled the following notice: ERCOT will be working from the alternate control center until further notice, use the OPX numbers for Bastrop. | Operational Information | Cancelled |
| May 15, 2026 5:36:28 PM | ERCOT is taking manual action for an unsolved contingency in the Taylor County area. | Operational Information | Active |
| May 15, 2026 2:05:30 PM | ERCOT has cancelled the following notice: ERCOT is taking manual action for an unsolved contingency in the Taylor County area. | Operational Information | Cancelled |
| May 15, 2026 12:04:38 PM | ERCOT is taking manual action for an unsolved contingency in the Taylor County area. | Operational Information | Active |
| May 15, 2026 3:58:46 AM | ERCOT will be working from the primary control center until further notice, use the OPX numbers for Taylor. | Operational Information | Active |
| May 15, 2026 12:06:33 AM | ERCOT has cancelled the following notice: ERCOT is taking manual action for an unsolved contingency in the Taylor County area. | Operational Information | Cancelled |
| May 15, 2026 12:06:05 AM | No sudden loss of generation greater than 450 MW occurred on May 14, 2026. | Operational Information | Active |
| May 14, 2026 4:00:05 PM | ERCOT will be working from the alternate control center until further notice, use the OPX numbers for Bastrop. | Operational Information | Active |
| May 14, 2026 3:06:51 PM | ERCOT is taking manual action for an unsolved contingency in the Taylor County area. | Operational Information | Active |
| May 14, 2026 9:56:53 AM | ERCOT has cancelled the following notice: ERCOT is taking manual actions to pre-posture for a 345 KV outage in the Upton County area. | Operational Information | Cancelled |
| May 14, 2026 9:03:54 AM | ERCOT is taking manual actions to pre-posture for a 345 KV outage in the Upton County area. | Operational Information | Active |
| May 14, 2026 12:02:30 AM | No sudden loss of generation greater than 450 MW occurred on May 13, 2026. | Operational Information | Active |
| May 13, 2026 10:48:37 AM | The DC_L (Laredo VFT) DC Tie will be unavailable from 05/19/2026 07:00 through 05/19/2026 12:00 due to a planned outage. | Operational Information | Active |
| May 13, 2026 12:08:57 AM | No sudden loss of generation greater than 450 MW occurred on May 12, 2026. | Operational Information | Active |
| May 12, 2026 8:16:07 PM | At 20:15, All Non-Spin has been recalled. | Operational Information | Active |
| May 12, 2026 8:15:25 PM | CM-ASM-NOTF AS_TYPE: Non-Spin, DEPLOY_MW: 0.0, BEGIN_TIME: 2026-05-12 20:15:25, END_TIME: 2026-05-12 20:15:25, DURATION: 0 HRS 0 MINS; | Operational Information | |
| May 12, 2026 7:21:28 PM | At 19:20 approximately 456 MW of Non-Spin has been deployed, anticipated duration is 23:59:59. | Operational Information | Active |
| May 12, 2026 7:20:28 PM | CM-ASM-NOTF AS_TYPE: Non-Spin, DEPLOY_MW: 456.6, BEGIN_TIME: 2026-05-12 19:20:28, END_TIME: 2026-05-12 23:20:28, DURATION: 4 HRS 0 MINS; | Operational Information | |
| May 12, 2026 10:48:11 AM | ERCOT Emergency Base Points are Disabled | Operational Information | Cancelled |
| May 12, 2026 10:45:05 AM | ERCOT has cancelled the following notice: At 10:30, ERCOT is conducting an unannounced Constant Frequency Control test and has placed a QSE on Constant Frequency. | Operational Information | Cancelled |
| May 12, 2026 10:37:27 AM | ERCOT Emergency Base Points are Enabled | Operational Information | Active |
| May 12, 2026 10:30:09 AM | At 10:30, ERCOT is conducting an unannounced Constant Frequency Control test and has placed a QSE on Constant Frequency. | Operational Information | Active |
| May 12, 2026 12:01:11 AM | No sudden loss of generation greater than 450 MW occurred on May 11, 2026. | Operational Information | Active |
| May 11, 2026 3:11:12 AM | ERCOT has cancelled the following notice: ERCOT is taking manual action for an unsolved contingency in the Taylor County area. | Operational Information | Cancelled |
| May 11, 2026 12:52:24 AM | No sudden loss of generation greater than 450 MW occurred on May 10, 2026. | Operational Information | Active |
| May 10, 2026 11:55:36 PM | ERCOT has cancelled the following notice: Ercot is issuing a Transmission Watch due to storm damage in the Rio Grande Valley of Harlingen, Brownsville and South Padre Island area. | Operational Information | Cancelled |
| May 10, 2026 3:40:52 PM | ERCOT is taking manual action for an unsolved contingency in the Taylor County area. | Operational Information | Active |
| May 10, 2026 6:55:57 AM | ERCOT has cancelled the following notice: ERCOT is taking manual action for an unsolved contingency in the Taylor County area. | Operational Information | Cancelled |
| May 10, 2026 12:28:07 AM | No sudden loss of generation greater than 450 MW occurred on May 9, 2026. | Operational Information | Active |
| May 9, 2026 10:22:32 PM | ERCOT is taking manual action for an unsolved contingency in the Taylor County area. | Operational Information | Active |
| May 9, 2026 8:22:22 PM | At 20:20, All Non-Spin has been recalled. | Operational Information | Active |
| May 9, 2026 8:20:43 PM | CM-ASM-NOTF AS_TYPE: Non-Spin, DEPLOY_MW: 0.0, BEGIN_TIME: 2026-05-09 20:20:43, END_TIME: 2026-05-09 20:20:43, DURATION: 0 HRS 0 MINS; | Operational Information | |
| May 9, 2026 8:10:40 PM | CM-ASM-NOTF AS_TYPE: Non-Spin, DEPLOY_MW: 124.0, BEGIN_TIME: 2026-05-09 20:10:40, END_TIME: 2026-05-09 23:59:59, DURATION: 3 HRS 49 MINS; | Operational Information | |
| May 9, 2026 7:50:40 PM | CM-ASM-NOTF AS_TYPE: Non-Spin, DEPLOY_MW: 249.0, BEGIN_TIME: 2026-05-09 19:50:40, END_TIME: 2026-05-09 23:50:40, DURATION: 4 HRS 0 MINS; | Operational Information | |
| May 9, 2026 7:30:41 PM | CM-ASM-NOTF AS_TYPE: Non-Spin, DEPLOY_MW: 520.9, BEGIN_TIME: 2026-05-09 19:30:40, END_TIME: 2026-05-09 23:30:40, DURATION: 4 HRS 0 MINS; | Operational Information | |
| May 9, 2026 7:20:41 PM | At 19:19 approximately 956.18 MW of Non-Spin has been deployed, anticipated duration is 05/09/26 2359. | Operational Information | Active |
| May 9, 2026 7:19:11 PM | CM-ASM-NOTF AS_TYPE: Non-Spin, DEPLOY_MW: 956.2, BEGIN_TIME: 2026-05-09 19:19:11, END_TIME: 2026-05-09 23:19:11, DURATION: 4 HRS 0 MINS; | Operational Information | |
| May 9, 2026 3:46:48 PM | Ercot is issuing a Transmission Watch due to storm damage in the Rio Grande Valley of Harlingen, Brownsville and South Padre Island area. | Operational Information | Active |
| May 9, 2026 12:04:14 AM | No sudden loss of generation greater than 450 MW occurred on May 8, 2026. | Operational Information | Active |
| May 8, 2026 12:00:58 AM | No sudden loss of generation greater than 450 MW occurred on May 7, 2026. | Operational Information | Active |
| May 7, 2026 6:30:06 PM | ERCOT has cancelled the following notice: At 15:30 on 05/07/2026, ERCOT will perform a site failover of its Energy and 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 7, 2026 2:13:36 PM | At 15:30 on 05/07/2026, ERCOT will perform a site failover of its Energy and 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 7, 2026 12:00:34 AM | No sudden loss of generation greater than 450 MW occurred on May 6, 2026. | Operational Information | Active |
| May 6, 2026 12:01:06 AM | No sudden loss of generation greater than 450 MW occurred on May 5, 2026. | Operational Information | Active |
| May 5, 2026 12:11:16 AM | No sudden loss of generation greater than 450 MW occurred on May 4, 2026. | Operational Information | Active |
| May 4, 2026 10:54:10 AM | ERCOT has cancelled the following notice: ERCOT is taking manual action for an unsolved contingency in the Taylor County area. | Operational Information | Cancelled |
| May 4, 2026 12:49:16 AM | No sudden loss of generation greater than 450 MW occurred on May 3, 2026 | Operational Information | Active |
| May 3, 2026 11:46:55 PM | ERCOT is taking manual action for an unsolved contingency in the Taylor County area. | Operational Information | Active |
| May 3, 2026 12:06:05 AM | No sudden loss of generation greater than 450 MW occurred on May 2, 2026 | Operational Information | Active |
| May 2, 2026 12:48:16 AM | No sudden loss of generation greater than 450 MW occurred on May 1, 2026 | Operational Information | Active |
| May 1, 2026 12:42:35 PM | ERCOT has cancelled the following notice: ERCOT is taking manual action for a contingency in the Brazoria County area. | Operational Information | Cancelled |
| May 1, 2026 1:33:08 AM | No sudden loss of generation greater than 450 MW occurred on April 30, 2026. | Operational Information | Active |