1. - Boxes represent the 25%/75% percentiles. Leader lines show the min/max voltage during the period. - Data is normalized so that the 1.0 per-unit value represents the control point from the voltage profile. - Based on one-minute PI data Preliminary Information for Reliability Discussion Voltage Control Jan 2013 – Transmission/Generations Buses with a Defined Voltage Profile

2. - Boxes represent the 25%/75% percentiles. Leader lines show the min/max voltage during the period. - Data is normalized so that the 1.0 per-unit value represents the control point from the voltage profile. - Based on one-minute PI data Voltage Control Jan 2013 – Transmission/Generations Buses with a Defined Voltage Profile Preliminary Information for Reliability Discussion

3. - Boxes represent the 25%/75% percentiles. Leader lines show the min/max voltage during the period. - Data is normalized so that the 1.0 per-unit value represents the control point from the voltage profile. - Based on one-minute PI data Voltage Control Apr 2013 – Transmission/Generations Buses with a Defined Voltage Profile Preliminary Information for Reliability Discussion

4. - Boxes represent the 25%/75% percentiles. Leader lines show the min/max voltage during the period. - Data is normalized so that the 1.0 per-unit value represents the control point from the voltage profile. - Based on one-minute PI data Voltage Control Apr 2013 – Transmission/Generations Buses with a Defined Voltage Profile Preliminary Information for Reliability Discussion

5. - Boxes represent the 25%/75% percentiles. Leader lines show the min/max voltage during the period. - Data is normalized so that the 1.0 per-unit value represents the control point from the voltage profile. - Based on one-minute PI data Voltage Control July 2013 – Transmission/Generations Buses with a Defined Voltage Profile Preliminary Information for Reliability Discussion

6. - Boxes represent the 25%/75% percentiles. Leader lines show the min/max voltage during the period. - Data is normalized so that the 1.0 per-unit value represents the control point from the voltage profile. - Based on one-minute PI data Voltage Control July 2013 – Transmission/Generations Buses with a Defined Voltage Profile Preliminary Information for Reliability Discussion