NOGRR247  Change UFLS Stages and Load Relief Amounts

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.