Process Timeline. Area Bubbles. Legend. Problem Area that have been resolved. Recurring Areas from previous System Assessment.
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1 Process Timeline Legend Problem Area that have been resolved Recurring Areas from previous System Assessment New Areas Area Bubbles
2 Flows Modeled for One-Year Heavy Winter Peak Conditions Base Case Conditions
3 Flows Modeled for One-Year Heavy Summer Peak Conditions Base Case Conditions
4 Flows Modeled for One-Year Light Summer Peak Conditions Base Case Conditions
5 Flows Modeled for Five-Year Heavy Winter Peak Conditions Base Case Conditions
6 Flows Modeled for Five-Year Heavy Summer Peak Conditions Base Case Conditions
7 Flows Modeled for Ten-Year Heavy Winter Peak Conditions Base Case Conditions
8 Flows Modeled for Ten-Year Heavy Summer Peak Conditions Base Case Conditions
9 Montana to Northwest Northwest to British Columbia
10 California - Oregon Interties Idaho to Northwest
11 Alturas Pacific DC Intertie
12 West of Cascades North West of Cascades South
13 South of Allston North of John Day
14 West of Hatwai West of McNary
15 Legend Substations 115 kv Lines 230 kv Lines Dams Yakima/Wanapum Area Map Legend Substations 115 kv Lines 230 kv Lines Dams Sandpoint Area Map
16 Legend Substations 230 kv Lines 500 kv Lines Spokane Area Map Legend Substations 115 kv Lines 230 kv Lines Dams Othello Area
17 Legend Substations 115 kv Lines 230 kv Lines Dams Headwork/Summer Falls Area Map Substation MVARs Owner Flathead 5 Bonneville Cascade Steel 40 Bonneville Chiloquin 10 PacifiCorp Nickel Mountain 15 PacifiCorp Pilot Butte 10 PacifiCorp Potential Reactive Mitigation Projects Substation MVARs Owner Tahkenitch 90 Bonneville DeMoss 10 Bonneville Potential Reactive Mitigation Projects for Stability Issues and Unsolved Outages
18 Transmission Projects included in the Base Cases 29 Committed Projects Included in All Cases Sponsor Date Big Eddy - Knight 500 kv line and Knight Substation Bonneville Power 2015 Bell 230 kv Bus Section Breaker Bonneville Power 2016 Central Ferry - Lower Monumental 500 kv Line Project Bonneville Power 2015 Lower Valley Reinforcement - Hooper Springs Bonneville Power 2015 Pearl 500 kv Breaker Addition Bonneville Power 2016 Monroe 500 kv Capacitors Bonneville Power 2014 Columbia 230 kv Bus Section Breaker Bonneville Power 2015 Alvey 500 kv Shunt Reactor Bonneville Power 2015 John Day - Big Eddy 500 kv #1 line reconductor Bonneville Power 2016 Raver 500/230 kv Transformer, 230 kv line to Covington Substation Bonneville Power 2016 Big Eddy 230/115 kv Transformer #1 Replacement Bonneville Power 2015 Celilo Terminal Replacement (PDCI upgrade 3220 MW) Bonneville Power 2017 Paul 500 kv Shunt Reactor Bonneville Power 2016 Tacoma 230 kv Bus Section Breaker Bonneville Power 2016 North Bonneville - Troutdale 230 kv #2 Line Retermination Bonneville Power 2015 Rapids - Columbia 230 kv line and Columbia Terminal Douglas County PUD 2016 Rocky Ford - Dover 115 kv line Grant County PUD 2016 Fry 115 kv Capacitors MVARs (2x20 MVARs, 2x30 MVARs) PacifiCorp 2015 Snow Goose 500/230 kv Transformer (on Captain Jack - KFalls Cogen 500 kv line) PacifiCorp 2017 Union Gap 230/115 kv Transformer #3 PacifiCorp 2017 Whetstone 230/115 kv Transformer PacifiCorp 2015 Alderton 230/115 kv transformer in Pierce County Puget Sound Energy 2016 Berverly Park 230/115 kv Transformer Snohomish County PUD 2016 Cowlitz 230 kv Substation Reliability Improvement Project Tacoma Power Southwest Substation 230 kv Bus Reliability Improvement Project Tacoma Power Rocky Reach-Columbia #2 230 kv Up-rate to 100C MOT Chelan County PUD 2015 Rocky Reach-Chelan #1 115 kv Up-rate to 75C MOT Chelan County PUD 2015 Rocky Reach 230/115 kv Autotransformer #2 Chelan County PUD 2015 Committed Projects in 5 Year & 10 Year Cases Sponsor Date Bronx - Cabinet 115 kv Line Rebuild Avista 2016 Benton-Othello 115 kv Line Upgrade Avista 2016 Westside 230 kv Rebuild and Transformer Upgrades Avista 2016 Irvin Project - Spokane Valley Transmission Reinforcements Avista 2016 Castle Rock - Troutdale 500 kv line (I-5 Corridor Reinforcement Project) Bonneville Power 2020 Pearl 230 kv Bus Section Breaker Bonneville Power 2017 McNary 500/230 kv Transfomer #2 Bonneville Power 2017 Salem - Chemawa 230 kv Line Upgrade Bonneville Power 2018 Troutdale 230 kv Bus Section Breaker Bonneville Power 2018 Longview - Lexington #2 upgrade from 69 kv to 115 kv Cowlitz County PUD 2017 Longview - Lexington - Cardwell upgrade from 69 kv to 115 kv Cowlitz County PUD 2017 South Cowlitz County Project Cowlitz County PUD 2018 Hemingway - Boardman 500 kv line Idaho Power/BPA 2020
19 Table Mountain 500/230 kv Transformer (on Dixonville - Meridian 500 kv line) PacifiCorp 2019 Troutdale East - Blue Lake - Gresham 230 kv line Portland General Electric 2018 Horizon Phase II Project Portland General Electric 2018 Woodland - Gravelly Lake 115 kv Line Puget Sound Energy 2019 Eastside Project: Lakeside 230/115 kv Transformer and Sammamish-Lakeside-Talbot line rebuild tpuget Sound Energy 2018 Portal Way 230/115 kv Transformer #2 and Line Upgrades Puget Sound Energy/BPA 2018 Bothell - SnoKing 230 kv Double Circuit Line Reconductor Seattle City Light/BPA 2017 Denny - Broad and Massachusetts - Union - Broad 115 kv Series Inductors Seattle City Light 2017 Denny Substation - Phase 1 Seattle City Light 2017 Upgrade Denny Substation Transmission - Phase 2 Seattle City Light 2020 Delridge - Duwamish 230 kv Line Reconductor Seattle City Light 2017 Swamp Creek 115 kv Switching Station Snohomish County PUD 2018 Turner - Woods Creek 115 kv Line Snohomish County PUD 2020 Committed Projects in 10 Year Cases Only Sponsor Date Schultz - Raver 500 kv Series Capacitors Bonneville Power 2024 Re-configureNavy - Everett -Kimberly Clark Snohomish County PUD 2021
20 Projects Energized in the last year Tables for Sensitivities 17HS 16-17HW 17LSP 20HS 20-21HW 25HS 25-26HW Northwest Load 25,120 30,855 17,565 25,892 31,973 27,390 33,066 Northwest Generation 29,786 35,329 24,895 31,059 36,041 30,578 34,934 Northwest - BC Hydro Flow -2,301 1,506-1,242-2,292 1,497-2,296 1,498 Idaho - Northwest Flow Montana - Northwest Flow 619 1,176 1, PDCI Flow 2,000 1,230 3,102 2, , COI Flow 3,956 1,866 3,730 3, , North of John Day Flow 4,676 2,425 4,250 5,154 2,335 6,908 3,260 South of Allston Flow 2,102 1,023 1,074 1, , West of Cascades North Flow 3,394 8, ,582 9,028 4,968 9,117 West of Cascades South Flow 4,117 5,567 3,248 3,983 5,830 4,866 6,579 West of Hatwai Flow , Base Case Summary
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