DOMINION ENERGY UTAH / WYOMING INTEGRATED RESOURCE PLAN Docket 20-057-02 (Plan Year: June 1, 2020 to May 31, 2021) Submitted: June 12, 2020 Table of Contents TABLE OF CONTENTS 1. EXECUTIVE SUMMARY ............................................................................ 1-1 2. INDUSTRY OVERVIEW ............................................................................. 2-1 Federal Energy Regulatory Commission Update............................................................................2-1 Clean Energy Regulation ................................................................................................................2-1 Power Generation Impact on Natural Gas ......................................................................................2-2 Pricing Trends ................................................................................................................................2-3 Production Trends ..........................................................................................................................2-3 Storage Trends ...............................................................................................................................2-4 LNG Exports ...................................................................................................................................2-4 Wyoming IRP Process ....................................................................................................................2-6 Utah IRP Process ...........................................................................................................................2-6 3. CUSTOMER AND GAS DEMAND FORECAST .......................................... 3-1 Impacts of COVID-19 .....................................................................................................................3-1 System Total Temperature-Adjusted Dth Sales and Throughput Comparison – 2019-2020 IRP and Actual Results.................................................................................................................................3-1 Temperature-Adjusted Dth Sales and Throughput Summary – 2020-2021 IRP Year ....................3-1 Residential Usage and Customer Additions ...................................................................................3-2 Small Commercial Usage and Customer Additions ........................................................................3-3 Non-GS Commercial, Industrial and Electric Generation Gas Demand ..........................................3-4 Firm Customer Design Day Gas Demand ......................................................................................3-4 Source Data....................................................................................................................................3-5 Alternatives to Natural Gas .............................................................................................................3-5 Gas Lost And Unaccounted For .....................................................................................................3-6 Forecast Exhibits ............................................................................................................................3-8 Exhibit Numbers ...................................................................................................................3.1 - 3.11 4. SYSTEM CAPABILITIES AND CONSTRAINTS ......................................... 4-1 DEUWI System Overview ...............................................................................................................4-1 Ongoing and Future System Analysis Projects...............................................................................4-2 System Modeling and Reinforcement .............................................................................................4-3 Model Verification ...........................................................................................................................4-3 Gate Station Flows vs. Capacity .....................................................................................................4-4 System Pressures ..........................................................................................................................4-5 Long-Term Planning .....................................................................................................................4-12 System Capacity Conclusions ......................................................................................................4-13 5. DISTRIBUTION SYSTEM ACTION PLAN .................................................. 5-1 High Pressure Projects: ..................................................................................................................5-1 Plant Projects: ..............................................................................................................................5-10 Intermediate High Pressure Projects: ...........................................................................................5-10 Transponder Replacement Program ............................................................................................5-11 Master Meters...............................................................................................................................5-11 Rural Expansion ...........................................................................................................................5-11 6. INTEGRITY MANAGEMENT...................................................................... 6-1 Activities and Associated Costs for Transmission Lines and Distribution Systems ........................6-1 Transmission Integrity Management ...............................................................................................6-2 Distribution Integrity Management ..................................................................................................6-5 Cost Summary ................................................................................................................................6-5 Key Performance Integrity Metrics ..................................................................................................6-6 New Regulations ............................................................................................................................6-6 1 Table of Contents Industry and Company Best Practices ........................................................................................... 6-9 Exhibit Numbers .................................................................................................................... 6.1 - 6.2 7. ENVIRONMENTAL REVIEW ...................................................................... 7-1 8. PURCHASED GAS .................................................................................... 8-1 Local Market Environment ............................................................................................................. 8-1 Annual Gas Supply Request for Proposal ..................................................................................... 8-2 Price Stabilization .......................................................................................................................... 8-4 Exhibit Number ...............................................................................................................................8.1 9. COST-OF-SERVICE GAS .......................................................................... 9-1 Cost-of-Service Modeling Factors.................................................................................................. 9-1 Producer Imbalances ..................................................................................................................... 9-4 Future Resources ......................................................................................................... 9-5 Production Shut-Ins ....................................................................................................................... 9-6 Exhibit Number ...............................................................................................................................9.1 10. GATHERING, TRANSPORTATION, AND STORAGE ............................... 10-1 Gathering and Processing Services............................................................................................. 10-1 Transportation Services ............................................................................................................... 10-1 Firm Peaking Services ................................................................................................................. 10-5 Storage Services ......................................................................................................................... 10-6 Related Issues ........................................................................................................................... 10-11 Exhibit Numbers ................................................................................................................ 10.1 - 10.5 11. SUSTAINABILITY .................................................................................... 11-1 Delivering Clean Energy .............................................................................................................. 11-1 Sustainability in the West ............................................................................................................. 11-2 12. ENERGY-EFFICIENCY