Which Emergency Notice will be issued when the clock-minute average system frequency falls below 59.91 Hz for 20 consecutive minutes?

Which Emergency Notice will be issued when the clock-minute average system frequency falls below 59.91 Hz for 20 consecutive minutes?

• A. EEA Level 1
• B. EEA Level 2
• C. EEA Level 3
• D. Emergency Notice Bravo

Answer: (C)

When the clock-minute average system frequency stays below 59.91 Hz for a full 20 minutes, it signals a sustained underfrequency condition severe enough to escalate notifications. The clock-minute average smooths out short dips, so enduringly dipping to 59.91 Hz indicates an imbalance between generation and demand that the ERCOT reliability framework treats as a high-risk event. In this scenario, the appropriate action is to issue Emergency Energy Alert Level 3, the most severe level, which triggers heightened coordination and actions to restore balance, including potential demand reduction and other reliability measures. Emergency Notice Bravo is a different type of emergency communication and is not the level associated with this sustained underfrequency condition.

When the clock-minute average system frequency stays below 59.91 Hz for a full 20 minutes, it signals a sustained underfrequency condition severe enough to escalate notifications. The clock-minute average smooths out short dips, so enduringly dipping to 59.91 Hz indicates an imbalance between generation and demand that the ERCOT reliability framework treats as a high-risk event. In this scenario, the appropriate action is to issue Emergency Energy Alert Level 3, the most severe level, which triggers heightened coordination and actions to restore balance, including potential demand reduction and other reliability measures. Emergency Notice Bravo is a different type of emergency communication and is not the level associated with this sustained underfrequency condition.