Resiliency and Reliability Electric Transmission & Distribution Virginia Municipal League  July 21, 2017 Brett Crable, Director New Technology & Energy Conservation

Dominion Energy Profile Primary Operating Segments Power Delivery Group Gas Infrastructure Group Power Generation Group Electric Transmission 6,600 miles of transmission lines Favorable regulatory environment Electric Distribution 57,600 miles of distribution lines 2.6 million franchise retail customer accounts in VA and NC Gas Transmission Together with Gas Distribution, operates one of the largest natural gas storage system in the U.S. 15,000 miles of pipeline in eleven states Cove Point LNG import facility Well positioned in Marcellus and Utica Shale regions Gas Distribution 51,300 miles of distribution pipeline and 2.3 million natural gas customer accounts in five states Dominion Energy Solutions Utility Generation 21,500 MW of capacity Balanced, diverse fuel mix Favorable regulatory environment Merchant Generation 4,700 MW of capacity, including nuclear, gas and renewable power Active hedging program for energy revenue/margins

Safe and Reliable Energy

Committed to Working Safely OSHA Recordable Incident Rate 1.69 RD/LD Recordable Incident Rate * Dominion incidents rate = number of recordables x 200,000/man-hours worked

Distribution Reliability Sustained Improvement Three-year rolling average minutes without service for customers has declined nearly 20 percent since 2006 Active weather year in 2016 drove increase; weather-related days were up 67 percent over the previous three years SAIDI – Average Minutes Out per Customer, Excluding Major Events, Three-Year Rolling Average Source: Dominion Energy Virginia

Distribution Reliability Programs Asset Upgrades & Technology Rebuild circuits to new standards Replace end of life equipment: Cable Poles Switches Transformers Wire Technology Automation Thermal scans Grid devices

Distribution Reliability Strategic Underground Program Program Benefits: Decreased outage locations Significant reduction in restoration times for all customers Designed to convert ~4,000 miles of most outage prone distribution tap lines to underground to improve reliability and storm resiliency Accomplishments to date: Over 550 miles of overhead outage prone lines converted to underground 1,650 tap lines converted

Electric Transmission Reliability Source: Dominion Energy Virginia

Electric Transmission Forces Driving Infrastructure Need Economic Growth Dominion – fastest growing area in PJM Government agencies, military installations, data centers, etc. 20,000-30,000 new customers annually $4 billion assets in service 6,600 transmission miles / 45,000 structures 800+ substations First 500kV electric transmission loop in North America; built in 1960s 60% of our system was built prior to 1980 Aging Power Grid Assets Transmission system is always changing – new/retired generation, new/rebuilt transmission lines, new customers, etc. Transmission load flow is constantly modeled to ensure reliability New projects essential to resolve issues Addressing Mandatory NERC Criteria Standards

Electric Transmission Major Projects for 2017-2021 Customer Driven Aging Infrastructure Yardley Ridge/ Poland Road Cunningham-Dooms Cunningham-Elmont Warrenton-Wheeler-Gainesville Norris Bridge Haymarket NERC Reliability Criteria Idylwood-Tysons Glebe-Potomac River Remington-Gordonsville Skiffes Creek 1 2 3 5 4 6 7 8 10 9

Physical Security Functioning Decision Center Event and Information Analysis Threat Management & Countermeasures 24 x 7 Monitoring and Management Rapid Integrated Response Common Operating Picture Time is Mitigation Interface with State and Local Government Agencies

Cyber Security Cyber Mutual Assistance 93 Utilities Voluntary sharing of equipment, resources and knowledge Enterprise level PCs, mainframe, application software Systems controls in field Multiple industry associations share

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