1. Leading the Way in Electricity SM PLUG-IN ELECTRIC VEHICLE READINESS SOUTHERN CALIFORNIA EDISON Plug-in Electric Vehicle Readiness Managing the Electric Grid Doug Kim, Director – PEV Readiness August 6, 2010

2. Leading the Way in Electricity SM PLUG-IN ELECTRIC VEHICLE READINESS SOUTHERN CALIFORNIA EDISON 1 Utility Management of Grid Impacts Indicative information on vehicle volumes and clustering Assumptions on charging behaviors Detailed circuit modeling of incremental EV impacts Feedback from actual adoption information Engineering & Planning Response & Execution Forecasting & Assessment Incorporate EVs into current long lead-time work planning procedures Adjust infrastructure replacement programs for EV expectations Change design standards for new load expectations Perform infrastructure inspection with each known EV Streamline customer processes Even out workload to avoid resource constraints & delays Provide learnings to forecasts & engineering SCE is undertaking the necessary steps to ensure grid stability, but better information on EV adopters and acceptance of off-peak charging can significantly reduce costs

3. Leading the Way in Electricity SM PLUG-IN ELECTRIC VEHICLE READINESS SOUTHERN CALIFORNIA EDISON 2 Evolution of Grid Impact Management Cumulative Plug-in Vehicles Forecast in SCE Territory (in thousands) Local Distribution SystemLoad Management Smart Grid Insufficient volume for load control benefit realization Awareness of TOU rates Utility responds to transformer and sub-circuit issues Handraiser and purchase notification is key Off-peak charging behaviors create real benefit Emerging vehicle-grid communications enable smart charging Customer education takes hold & behaviors shift Emerging smart grid deployment enables advanced control programs Customer “energy conscience” well developed Interoperability needed for energy management 213

4. Leading the Way in Electricity SM PLUG-IN ELECTRIC VEHICLE READINESS SOUTHERN CALIFORNIA EDISON 3 Stakeholder Collaboration a Necessity Share handraiser information to inform planning process & improve long-lead time investments Obtain early, address-level notification of PEV adopters through “data clearinghouse” Increase customer awareness of time-of-use rates & encourage off-peak charging Develop “smart charging” equipment and communication protocols to enable load management PEV Ecosystem Trade Associations/ NGOs Standards Organizations Local Government & Communities State Government/ Agencies Customers Charging Equipment Manufacturers Equipment Installation Providers Charging Stations Operators Utilities Car Manufacturers (OEM) Managing the electric grid reliability and cost is a long-term project that requires the cooperation of the entire EV ecosystem now