PacifiCorp 2007 Integrated Resource Plan (May 30, 2007)

PacifiCorp – 2007 IRPChapter 7 – Modeling and● The west IGCC resources were removed as options for all portfolios. These IGCC units werepatterned after the planned Pacific Mountain Energy Center IGCC project in Kalama,Washington. Reasons for exclusion included (1) regulatory uncertainties regarding siting ofcoal-based generation in Washington, (2) commercial uncertainties regarding capital costs,and (3) the unique project-specific characteristics (such as a proposed fuel supply thatincludes imported petroleum coke) that make it unsuitable as a generic IGCC resource.Wind Resources● PacifiCorp developed and applied a new fixed wind investment schedule for all Group 2portfolios except for RA13, consisting of a total of 1,600 megawatts of wind resources beyondthe 400 megawatts already reflected in the load and resource balance. This schedule isbased on acquiring the 1,400 megawatts of wind by 2010 (reflecting an accelerated time tablerelative to the initial investment schedule developed for risk analysis portfolios) and the additional600 megawatts tested as a resource strategy in the Group 1 analysis. Table 7.29 showsthis new wind investment schedule for the 1,600 megawatts of wind, including the associatedcumulative capacity contributions. 60Table 7.29 – Wind Resource Additions Schedule for Risk Analysis PortfoliosYearAnnual Additions,NameplateCapacity(MW)LocationCumulativeWind NameplateCapacity(MW)Cumulative WindPeak CapacityContribution(MW)2007 300 Southeast Washington 300 142008 300 Wyoming; Southeast Washington 600 382009 100 North Central Oregon 700 752010 300 Wyoming; North Central Oregon 1,000 1192011 200 Wyoming 1,200 1272012 100 North Central Oregon 1,300 1462013 300 Wyoming 1,600 207● The capacity factor for southeast Wyoming wind resources was increased from 32% to 40%to reflect updated operational expectations for these wind sites.Gas Resources● For initial CEM resource screening analysis, there were no restrictions placed on the type andtiming of gas resources.Front Office Transactions● The model is able to select front office transactions after 2011.Transmission Resources● PacifiCorp incorporated the following set of transmission resources in all the Group 2 portfolios:60 The capacity contribution of this new investment schedule is smaller than the contribution for the previous schedule,even though there is more nameplate capacity added. This is due to the relocation of wind projects to areas forwhich incremental additions have less peak-hour load carrying capability.180