BONNEVILLE POWER ADMINISTRATION OPEN ACCESS TRANSMISSION TARIFF – ATTACHMENT K TRANSMISSION PLAN Prepared by Transmission Planning December 2019 2019 Table of Contents 1. Executive Summary .............................................................................................................................................................................. 6 2. Transmission Services ........................................................................................................................................................................... 8 2.1 Transmission Business Model .................................................................................................................................................. 8 2.2 Planning & Asset Management Organization ................................................................................................................... 8 2.3 Attachment K Planning Process ........................................................................................................................................... 9 2.4 FERC Order 845 ....................................................................................................................................................................... 9 3. Transmission Planning Activities ........................................................................................................................................................ 10 3.1 Area Planning and System Assessment ............................................................................................................................. 11 3.2 Transmission Service & Commercial Assessment .............................................................................................................. 12 3.3 Interconnection Requests Studies ...................................................................................................................................... 13 4. Major Transmission Projects ............................................................................................................................................................... 14 4.1 South Tri-Cities Reinforcement ............................................................................................................................................ 15 4.2 Raver 500/230 kV Transformer Addition ............................................................................................................................. 16 4.3 Longview Area 230/115 kV Transformer Addition ............................................................................................................. 17 4.4 Schultz-Wautoma 500 kV Series Capacitor Addition ....................................................................................................... 18 4.5 Slatt Series Capacitor Addition and Bakeoven Series Capacitor Optimization ........................................................... 19 5. Transmission Planning Landscape .................................................................................................................................................... 20 5.1 Western Energy Imbalance Market .................................................................................................................................... 20 5.2 Northwest Power Plan & Mid-Term Assessment ................................................................................................................ 21 5.3 PNUCC Northwest Regional Forecast ................................................................................................................................ 24 5.4 BPA White Book Loads and Resources .............................................................................................................................. 27 5.5 State’s Renewable Portfolio Standard ............................................................................................................................... 28 5.6 Northwest Power Pool .......................................................................................................................................................... 28 5.7 NorthernGrid Transmission Group ....................................................................................................................................... 29 5.8 RC West ................................................................................................................................................................................. 30 6. Transmission Planning Overview ....................................................................................................................................................... 32 6.1 Planning Processes ............................................................................................................................................................... 33 6.2 Roles and Responsibilities .................................................................................................................................................... 34 7. OATT Attachment K Overview ........................................................................................................................................................... 36 7.1 Responsibilities....................................................................................................................................................................... 36 7.2 Planning Cycle ...................................................................................................................................................................... 37 7.3 Public Meetings and Postings Cycle .................................................................................................................................. 38 Bonneville Power Administration | Transmission Planning | Executive Summary 2 8. Area Planning & System Assessment ................................................................................................................................................ 40 8.1 Area Planning Process ......................................................................................................................................................... 41 8.2 Planning Criteria ................................................................................................................................................................... 46 8.3 Assumptions........................................................................................................................................................................... 46 8.4 Methodology ........................................................................................................................................................................ 49 8.5 System Assessment Summary Report ................................................................................................................................. 51 9. Non-Wires Assessment ....................................................................................................................................................................... 52 9.1 Purpose of Non-Wires Alternatives ...................................................................................................................................... 52 9.2 New Non-Wires Assessment Information ............................................................................................................................ 52 9.3 Area Planning Non-Wires Assessment ................................................................................................................................ 52 9.4 Non-Wires Summary and Prioritization Reports .................................................................................................................. 53 9.5 Non-Wires Planning Process Diagram ................................................................................................................................ 53 10. Transmission Service Requests ...................................................................................................................................................... 54 10.1 Elements of TSEP .................................................................................................................................................................. 56 10.2 TSEP Cluster Study Purpose .................................................................................................................................................. 57 10.3 2019 Cluster Study Overview ............................................................................................................................................... 57 10.4 TSEP Cluster Study Steps ....................................................................................................................................................... 57 10.5 Cluster Study Report ............................................................................................................................................................. 58 10.6 Cluster Study Process ........................................................................................................................................................... 58 10.7 Cluster Study Methodology ................................................................................................................................................. 60 11. Interconnection Service