PacifiCorp 2007 Integrated Resource Plan (May 30, 2007)

PacifiCorp – 2007 IRPChapter 8 – Action Plansources needed on the east side of the system during this time frame based on a 12 percent planningreserve margin. Another 357 megawatts of base load / intermediate resource are identifiedin 2016. The 2007 integrated resource plan fully supports the outstanding Base Load Request forProposal.The 2007 integrated resource plan identified the need for 677 megawatts of base load / intermediateload thermal resources for the west side. The thermal resources consist of a 602 megawattcombined cycle natural gas plant in 2011 and 75 megawatts of combined heat and power in2012. These proxy resources identified in the integrated resource plan will be used to guide theprocurement of resources for the west side of the system such that the company can meet itsdeficit in the 2011-to-2012 time frame in a manner that is cost-effective, adjusted for risk. Theactual mix and quantity of resources procured by the company to satisfy this need in the westmay differ from the proxy resources identified in the integrated resource plan. Consistent withstate guidelines for resource procurement, the company will perform updated analyses at the timenew resources are acquired.Front Office TransactionsThe 2007 integrated resource plan identified the annual need for 50 to 650 megawatts of frontoffice transactions on the west side of its system for 2010 to 2014. The front office transactionsare modeled as flat annual purchases 67 and serve as a proxy for base load / intermediate load resources.Acquisition of front office transactions in the west will be considered in the context ofthe overall base load / intermediate load resource need in the west.On the east side, the integrated resource plan identified the annual need for up to 400 megawattsof front office transactions for the 2010-to-2014 period. The need may be addressed using theBase Load Request for Proposals. Beyond this time frame, the annual need drops to no more than200 megawatts.Transmission ExpansionThe 2007 integrated resource plan has identified a need for additional transmission as part of thepreferred portfolio. In general, transmission additions reflect the need to meet retail load requirements,integrate wind and provide system reliability. Specific enhancements are required tointegrate both the Wyoming and southern Utah areas with the Wasatch front, create additionalintegration with markets in the desert southwest, and integrate new resources and front officetransactions with loads on the west side of the company’s system.The transmission additions identified in the preferred portfolio are proxy transmission additions.They are included as options that can be selected by the company’s integrated resource planningmodels on a comparable basis with supply-side and demand-side resources. The proxy transmissionadditions included in the preferred portfolio serve as a guide to the company’s transmissionplanners and may ultimately result in construction of new facilities by the company, partneringin regional transmission projects with others, or the execution of third party wheeling contracts.The timing and size of new transmission facilities may vary from the proxy transmission addi-67 Market purchases are assumed to be delivered at market hubs, primarily Mid-Columbia, and not at the load. Forfront office transactions to reach load, additional transmission is required.231