Same as Add Zephyr A HVDC 5 High Load See EC26-1 project; link incremental case (loads resources via nomogram increased 8%) Same as Add Zephyr B HVDC 5 High Load See EC26-1 project; link incremental 3 case (loads resources via nomogram increased 8%) Same as Add Zephyr C HVDC 5 High Load See EC26-1 project; link incremental 4 case (loads resources via nomogram increased 8%) Add Zephyr D HVDC Same as project; link incremental High Load See EC26-1. Intermountain Generation resources via nomogram; case (loads Station (IGS) coal plant retired. receiving end rating for increased 8%) Path 27 increased to 2,650 MW It is important to note that the 1,000 MW of CC generation added to Wyoming were physically located in Wyoming (in the model), but included in the TEPPC load area of the receiving end of the DC line. Since the output of the combined cycle plants were being scheduled down the DC line, the goal was to have these units be dispatched based on economics at the receiving end of the line. This was achieved by assigning the resources to the area at the receiving end of the DC line, as opposed to within the load area where they physically reside. This modeling attempts to capture the proper behavior and dispatch that these units would see in this commercial application. Another key assumption is that the planning reserve margin (PRM) calculation did not take into account the additional transfer capacity provided by the added transmission expansion projects. Existing 2022 transmission was accounted for and allows TEPPC pools to share resources, but new transmission capacity was not added to this transfer capability. Table 2: Summary of Assumptions - Northwest Firmed Resource Options Case Loads Generation Transmission Same as PC23 resource case with 12,000 Same as PC1-5 High GWh of renewable generation added in the PC27a Load case (loads None Northwest. BCH hydro fixed to shapes from increased 8%) PC1-5 case. Same as PC23 resource case with 12,000 Same as PC1-5 High GWh of renewable generation added in the PC27b Load case (loads None Northwest. increased 8%) BCH hydro HTC price linked to NW buses
Same as High Load case (loads increased 8%) See EC26-1 Add Zephyr A HVDC project; link incremental resources via nomogram Same as High Load case (loads increased 8%) See EC26-1 Add Zephyr B HVDC project; link incremental resources via nomogram Same as High Load case (loads increased 8%) See EC26-1 Add Zephyr C HVDC project; link incremental resources via nomogram Same as High Load case (loads increased 8%) See EC26-1. Intermountain Generation Station (IGS) coal plant retired. Add Zephyr D HVDC project; link incremental resources via nomogram; receiving end rating for Path 27 increased to 2,650 MW It is important to note that the 1,000 MW of CC generation added to Wyoming were physically located in Wyoming (in the model), but included in the TEPPC load area of the receiving end of the DC line. Since the output of the combined cycle plants were being scheduled down the DC line, the goal was to have these units be dispatched based on economics at the receiving end of the line. This was achieved by assigning the resources to the area at the receiving end of the DC line, as opposed to within the load area where they physically reside. This modeling attempts to capture the proper behavior and dispatch that these units would see in this commercial application. Another key assumption is that the planning reserve margin (PRM) calculation did not take into account the additional transfer capacity provided by the added transmission expansion projects. Existing 2022 transmission was accounted for and allows TEPPC pools to share resources, but new transmission capacity was not added to this transfer capability. Table 2: Summary of Assumptions - Northwest Firmed Resource Options Case Loads Generation Transmission PC27a Same as PC1-5 High Load case (loads increased 8%) Same as PC23 resource case with 12,000 GWh of renewable generation added in the Northwest. BCH hydro fixed to shapes from PC1-5 case. None PC27b Same as PC1-5 High Load case (loads increased 8%) Same as PC23 resource case with 12,000 GWh of renewable generation added in the Northwest. BCH hydro HTC price linked to NW buses None 4 3 5 5 5
2022PC26-28_FirmedResourceOptions_StudyReport.docx