WESTERN UNDERGROUND COMMITTEE 2015 Spring Conference 65 th ANNIVERSARY 1950‐2015 Welcome Remarks Bill Chiu Director of Engineering – T&D Southern California Edison 1

 One of the nation’s largest electric utilities  Nearly 14 million residents in service territory  Approximately 5 million customer accounts  50,000 square-mile service area  System Peak of ~23,000 MW  Significant T&D infrastructure  1.4 million power poles  700,000 transformers  103,000 miles of distribution and transmission lines Southern California Edison – Overview SCE Service Territory One of the Nations Largest Electric Utilities More than 14 million customers Customers 50,000 Square Mile Area Approximately 500 miles of U/G Sub Transmission Lines 3.7 mile U/G Segment of TRTP Under Construction 2

Technological advances has resulted in leveling off of the demand on electricity Regulation driving competition Public policy prioritizing sustainability - greater focus on distribution networks as a platform to facilitate integration of renewable energy resources Utility Industry Trend & Challenges 3

Future state based on evolving energy landscape More automated and digital, with more sophisticated voltage control and protection schemes Facilitates increasing renewables & two- way power flow Cyber mitigation must be included Grid of the Future addresses new complexities 4

Current & Future Challenges 5

Example of Safety Considerations 6

Increasing Requests for Underground Facilities 7

Call to Action Safe Afford able Reliable 8