1. California Energy Commission James Madigan April 27, 2015

2. Plant Layout 2

3. Aerial View 3

4. Decommissioning 4

5. With our co-owners, Southern California Edison is committed to: Safety Safely decommissioning San Onofre Safely move the power plant’s used fuel into dry cask storage, until government approved long-term storage options are available Stewardship Leave the community better off Spending Nuclear Trust Funds wisely Return any unused monies to ratepayers Engagement Decommissioning process is inclusive, forward-thinking, involving diverse stakeholders Decommissioning Principles 5

6. Milestones 6 January 9, 2012Unit 2 begins refueling outage January 31, 2012Unit 3 Steam Generator Tube leak June 7, 2013Decision to retire Units 2 and 3 June 12, 2013Certification of Permanent Cessation of Power Operations August 2013Transition to Decommissioning Staffing, from 1500 to 600 people September 2013Focus on Initial Planning for Decommissioning Benchmarking, Data gathering Project Teams - Cold and Dark, ISFSI, Regulatory Submittals, Spent Fuel Pool Islanding Plant System draining and retirement

7. Milestones 7 January 201420 Year Decommissioning Plan February 2014Decommissioning Principles March 2014 First Community Engagement Panel Meeting Submitted Permanently Defueled Technical Specifications to NRC Submitted Permanently Defueled Emergency Plan to NRC August 2014Certified Fuel Handler Training Approval September 2014 Submitted Post-Shutdown Activities Report, Decommissioning Cost Estimate, Irradiated Fuel Management Plan to NRC December 2014Awarded Independent Spent Fuel Storage Installation Contract

8. Decommissioning Plan 8 8

9. Used Fuel Storage and Management 9

10. Used Fuel Storage 10 + 1 for GTCC

11. Spent Fuel Pool 11

12. Current Dry Fuel Storage Current ISFSI facility: 50 loaded used fuel canisters 1 module for GTCC 12 empty modules The existing Independent Spent Fuel Storage Installation (ISFSI) facility must be increased to accommodate approximately 100 additional canisters 12

13. ISFSI Proposed Expansion 13

14. Large presence in the U.S. and worldwide –Dry storage systems are currently in use at over 70 nuclear units across nine countries –Dry storage system used at nuclear sites in California Canisters are licensed for both storage and transportation by the NRC 14 HOLTEC

15. 15 HOLTEC HI-STORM UMAX SYSTEM Corrosion-Resistant Stainless Steel Spent Fuel Canister Reinforced Concrete Base Mat Corrosion-Resistant Stainless Steel Liner Reinforced Concrete Top Pad Solid Concrete Monolith 24,000 lb. Steel/Concrete Closure Lid

16. Questions

17. Back Up Slides 17

18. 18 HOLTEC HI-STORM UMAX SYSTEM at Humboldt Bay

19. Engineered Fill 19

20. Support Pad 20

21. Cavity Enclosure Containers (CEC) set on Base Mat 21

22. Aerial view of Form Work for Top Pad 22