1. Ajay Pappu Resource Integration Department ERCOT Generator Frequency Relay Settings Survey Dec 2013

2. Survey Objective Collect under-frequency relay setting data from generators In response to FERC NOPR (NERC PRC-024-1) on Sep 19, 2013, over-frequency relay settings were also requested Analyze the relay settings and recommend over-frequency requirements

3. Survey questions I s your generator able to meet the requirement established in Operating Guide Section 2.6.2 for under-frequency settings ? What are the over-frequency settings for this generator? If settings are correct in the RARF state so, if different, please enter settings and update the RARF. Is your Generator able to meet the over-frequency settings defined in the NERC PRC-024-1?

4. Preliminary Survey Results* Number of Units Meets LFRT (%)* Meets HFRT (%)* Meets LFRT&HFRT (%)* Unit Type Conventional457908176.5 Non Conventional1058772.4 Total562 *Subject to change based on further enquiries with Resource Entities