DOE Energy/Water Interdependency TTX

1. DOE Energy/Water Interdependency TTX “Electricity Systems Overview” Steve Lewis Georgia Power Company April 25, 2007

2. Northwest Northeast Metro N Metro W. Metro E. Metro S. East Central West Coastal South Georgia Power Facts & Figures

3. Georgia Power Facts & Figures

11. Potential Voltage Pressure Electrical Potential (measured in Volts) on the electrical transmission system is analogous to Pressure (measured in Pounds per square Inch, PSI) on the water system.

12. Power Watts Flow Rate Electrical Power (measured in Watts) on the electrical transmission system is analogous to Flow rate (measured in GPM) on the water system.

13. Energy Watt-hours Gallons Electrical Energy (measured in Watt-Hours) on the electrical transmission system is analogous to Total Water Delivered (measured in Gallons) on the water system.

14. Characteristics of Electricity • Travels at the speed of light. • Cannot be “stored” – long term • Cannot be “routed”

15. GENERATING GENERATING TRANSMISSION TRANSMISSION STATION STATION 500kV LINES LINES or or 230kV 230kV GSU TRANSFORMER GSU TRANSFORMER Geographic Geographic TRANSMISSION SUBSTATION TRANSMISSION SUBSTATION Boundary Boundary To Other Loads To Other Loads 100kV 100kV and Generation and Generation Lines Lines INDUSTRIAL OR INDUSTRIAL OR 44kV 44kV CUSTOMER STATION CUSTOMER STATION Control Control Lines Lines Center Center RETAIL SUBSTATION RETAIL SUBSTATION HOME OR BUSINESS HOME OR BUSINESS (CUSTOMER) (CUSTOMER)

16. Tie Lines 49 Tie Lines connect the Southern electrical system to neighboring utilities in the southeastern United States. Duke TVA    SCE&G         Entergy   Santee Cooper       JEA     Tal   SMEPA AEC FPC FPL

17. Questions?