Title Change UFLS Stages and Load Relief Amounts
Next Group
Next Step
Status Approved on 10/12/2023


Date Gov Body Action Taken Next steps
10/12/2023 PUCT Approved
08/31/2023 BOARD Recommended for Approval PUCT for consideration
07/25/2023 TAC Recommended for Approval Board for consideration
07/06/2023 ROS Recommended for Approval TAC for consideration
06/08/2023 ROS Recommended for Approval ROS for Impact Analysis for consideration
03/02/2023 ROS Deferred/Tabled ROS for consideration

Voting Record

Date Gov Body Motion Result
10/12/2023 PUCT To approve NOGRR247 and accompanying ERCOT Market Impact Statement as presented in Project No. 54445, Review of Rules Adopted by the Independent Organization Passed
08/31/2023 BOARD To recommend approval of NOGRR247 as recommended by TAC in the 7/25/23 TAC Report Passed
07/25/2023 TAC To recommend approval of NOGRR247 as recommended by ROS in the 7/6/23 ROS Report Passed
07/06/2023 ROS To endorse and forward to TAC the 6/8/23 ROS Report and 2/15/23 Impact Analysis for NOGRR247 Passed
06/08/2023 ROS To recommend approval of NOGRR247 as amended by the 4/27/23 CenterPoint Energy comments. Passed
03/02/2023 ROS To table NOGRR247 and refer the issue to the Dynamics Working Group (DWG), Operations Working Group (OWG), Performance, Disturbance, Compliance Working Group (PDCWG), and System Protection Working Group (SPWG) Passed


Status: Approved
Date Posted: Feb 15, 2023
Sponsor: ERCOT
Urgent: No
Sections: 2.6.1
Description: This Nodal Operating Guide Revision Request (NOGRR) modifies the ERCOT automatic Under-Frequency Load Shed (UFLS) program by increasing the number of Load shed stages from three to five and changing the Transmission Operator (TO) Load relief amounts to uniformly increment by 5% for each stage. The NOGRR also adds a UFLS minimum time delay of six cycles (0.1 seconds), and adds 59.1 Hz to the list of UFLS stages in paragraph (3) of Section 2.6.1. Additionally, this NOGRR revises the grey-box language from NOGRR226 in Section 2.6.1 to provide that the TO Load value used to determine the TO Load at each frequency threshold in Table 1 will be the value of TO Load at the time frequency reaches 59.5 Hz, rather than the value of TO Load at the time of reaching each successive frequency threshold, consistent with the current method for determining TO Load in Table 1, and proposes an effective date of October 1, 2026 for both NOGRR226 and NOGRR247.
Reason: Addresses current operational issues

Key Documents