Proposal for Modeling Cross-Tie Resources for Northern Grid Analysis

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The TransCanyon proposal outlines the Cross-Tie Transmission Project, a 213-mile, 1500 MW, 500 kV HVAC line aiming to strengthen electrical interconnections and facilitate power transfers between different regions. The NorthernGrid proposal involves modeling base cases to study resource dispatch, focusing on optimizing renewable energy utilization and balancing system resources through scaling back generation in certain areas. The cross-tie project is vital for transferring renewable resources from Wyoming and Utah to California, enhancing regional energy sustainability.


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  1. TransCanyon Proposal for Modeling Cross-Tie Resources for NorthernGrid Analysis DRAFT February 10, 2021

  2. Cross-Tie Transmission Project The Cross-Tie Transmission Project (Cross-Tie Project) is a proposed 213-mile, 1500 MW, 500 kV HVAC line Cross-Tie will be constructed between central Utah and east-central Nevada (see Figure 1) The project benefits include: Strengthen the electrical interconnection between the PacifiCorp and the NV Energy transmission systems Support interregional power transfers by linking NorthernGrid, WestConnect and CAISO planning regions to provide interregional power transfers Facilitates California s RPS and GHG requirements by moving Wyoming wind and Utah solar to California. The Cross-Tie Project s Project Review Group approved Phase 2B status with a planned bidirectional rating of 1500 MW on January 31, 2019 1

  3. Cross-Tie Transmission Project 2

  4. NorthernGrid (NG) Proposal for Resource Dispatch NG has identified nine hours to model as base cases from the annual production cost model The first eight will be used to study Cross-Tie Dispatch determined from NREL data (wind) and historical data (solar) Case Name Date Hour Solar and Wind Capacity Added Dispatch BC1 HS 7/30 2030 16 7481 2306 BC2 HW 12/10 2030 19 7481 2238 BC3 High WY 2/1 2030 1 7481 1716 4 High ID- NW 7/20 2030 17 7481 3754 5 High Borah W 9/1 2030 1 7481 2447 6 Northbound COI 3/10 2030 15 7481 6693 7 West of Cascades 4/3 2030 11 7481 2568 8 COI/PDCI High Hydro 6/4 2030 18 7481 2360 9 NG Combo Case 6/8 2030 5 3

  5. Resource Modeling Proposal Use dispatch per above Should be sufficient resources to stress Cross-Tie line in most cases BC6 (Northbound COI) with 6693MW dispatch will likely not solve As one of the Cross-Tie project s major benefits is to allow renewable resources in Wyoming and Utah to move through Nevada to California we propose reducing a like amount of generation in Southern California to balance system Use SCE and SDG&E areas and scale resources to reduce by incremental solar and wind dispatch in each case Example: BC1 would scale back Southern California Resources by 2306MW 4

  6. Questions? 5

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