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Public Notices
This section contains public market notifications required by protocols as well as other market messages ERCOT may post for market transparency. ERCOT began archiving public notices November 3, 2011.
| Dec 2025 | Jan 2026 | Feb 2026 | Mar 2026 | Apr 2026 | May 2026 |
| Date & Time | Notice | Type | Status |
|---|---|---|---|
| May 29, 2026 1:31:43 PM | ERCOT has cancelled the following notice: The DC_R (Railroad) DC Tie will be unavailable from 05/29/2026 07:00 through 05/29/2026 14:00 due to a planned outage. | Operational Information | Cancelled |
| May 29, 2026 11:24:02 AM | Frequency Measurable Events: Report tracking Frequency Measurable Events (FMEs) as of 05/29/2026 is available. | Operational Instruction | Active |
| May 29, 2026 12:03:39 AM | No sudden loss of generation greater than 450 MW occurred on May 28, 2026. | Operational Information | Active |
| May 28, 2026 8:01:13 PM | ERCOT has cancelled the following notice: The DC_L (Laredo VFT) DC Tie will be unavailable from 05/28/2026 18:52 through 05/29/2026 18:00 due to a forced outage. | Operational Information | Cancelled |
| May 28, 2026 7:22:05 PM | The DC_L (Laredo VFT) DC Tie will be unavailable from 05/28/2026 18:52 through 05/29/2026 18:00 due to a forced outage. | Operational Information | Active |
| May 28, 2026 12:00:08 AM | On May 27, 2026, a sudden loss of generation occurred at 00:29 totaling 514 MW. Frequency declined to 59.954 Hz, ERCOT load was 51,126 MW. | Operational Information | Active |
| May 27, 2026 2:24:28 PM | ERCOT has cancelled the following notice: ERCOT is taking manual actions for a Basecase in the Pecos County area. | Operational Information | Cancelled |
| May 27, 2026 1:23:18 PM | ERCOT is taking manual actions for a Basecase in the Pecos County area. | Operational Information | Active |
| May 27, 2026 2:45:12 AM | ERCOT has cancelled the following notice: The DC_E (East) DC Tie is being curtailed, a DC Tie Curtailment Notice (DCTCN) is active due to one or more transmission security violations that would be fully or partially resolved by the curtailment of DC Tie Load. | DC Tie Curtailment Notice | Cancelled |
| May 27, 2026 2:44:59 AM | ERCOT has cancelled the following notice: The DC_N (North) DC Tie is being curtailed, a DC Tie Curtailment Notice (DCTCN) is active due to one or more transmission security violations that would be fully or partially resolved by the curtailment of DC Tie Load. | DC Tie Curtailment Notice | Cancelled |
| May 27, 2026 12:04:28 AM | The DC_N (North) DC Tie is being curtailed, a DC Tie Curtailment Notice (DCTCN) is active due to one or more transmission security violations that would be fully or partially resolved by the curtailment of DC Tie Load. | DC Tie Curtailment Notice | Active |
| May 27, 2026 12:03:09 AM | The DC_E (East) DC Tie is being curtailed, a DC Tie Curtailment Notice (DCTCN) is active due to one or more transmission security violations that would be fully or partially resolved by the curtailment of DC Tie Load. | DC Tie Curtailment Notice | Active |
| May 27, 2026 12:00:23 AM | No sudden loss of generation greater than 450 MW occurred on May 26, 2026. | Operational Information | Active |
| May 26, 2026 4:48:16 PM | ERCOT has cancelled the following notice: The DC_L (Laredo VFT) DC Tie will be unavailable from 05/25/2026 20:00 through 05/26/2026 20:13 due to a forced outage. | Operational Information | Cancelled |
| May 26, 2026 12:16:13 AM | ERCOT has cancelled the following notice: The DC_L (Laredo VFT) DC Tie will be unavailable from 05/25/2026 20:00 through 05/25/2026 23:59 due to a forced outage. | Operational Information | Cancelled |
| May 26, 2026 12:16:01 AM | The DC_L (Laredo VFT) DC Tie will be unavailable from 05/25/2026 20:00 through 05/26/2026 20:13 due to a forced outage. | Operational Information | Active |
| May 26, 2026 12:00:06 AM | No sudden loss of generation greater than 450 MW occurred on May 25, 2026. | Operational Information | Active |
| May 25, 2026 8:13:46 PM | The DC_L (Laredo VFT) DC Tie will be unavailable from 05/25/2026 20:00 through 05/25/2026 23:59 due to a forced outage. | Operational Information | Active |
| May 25, 2026 12:02:48 AM | No sudden loss of generation greater than 450 MW occurred on May 24, 2026. | Operational Information | Active |
| May 24, 2026 4:33:23 AM | 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 24, 2026 1:21:04 AM | The DC_R (Railroad) DC Tie will be unavailable from 05/29/2026 07:00 through 05/29/2026 14:00 due to a planned outage. | Operational Information | Active |
| May 24, 2026 12:02:32 AM | No sudden loss of generation greater than 450 MW occurred on May 23, 2026. | Operational Information | Active |
| 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 12:16:36 AM | The minimum monthly Ancillary Services quantities have been posted to the ERCOT Website; Data Products; Grid; Forecasts under the Projected Ancillary Service Requirements link located under the Reports & Extracts 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/secure/data-products/grid/forecasts | AS Postings | Active |
| 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 |