PacifiCorp 2007 Integrated Resource Plan (May 30, 2007)

PacifiCorp – 2007 IRPChapter 5 – Resource OptionsFigure 5.1 – Proxy Wind Sites and Maximum Capacity AvailabilitiesSE WA300 MWNC OR300 MWSC MT200 MWSE ID300 MWSW WY600 MWSE WY600 MWEC NV400 MWWC UT200 MWFor other wind resource attributes, the company used multiple sources to derive attributes.PacifiCorp has been very active in purchasing wind projects in the last year. This has given thecompany considerable market knowledge of the current cost of wind development. Consequently,wind resources were developed primarily from PacifiCorp experiences with wind developersand from responses to the 2003 renewable resource request for proposals. The EPRI TAGdatabase was also used for certain cost figures, such as operation and maintenance costs. Thesecosts were adjusted for current market conditions.For modeling purposes, it was deemed advantageous to represent wind projects as realistically aspossible by capturing the fluctuation of wind generation on an hourly basis, capturing the systemcosts and effects of the variability, seasonality, and diurnal shape of wind generation. These attributesand the methodologies used to derive them are discussed in Appendix J.Other Renewable ResourcesOther renewable generation resources included in the supply-side resource options table includegeothermal, biomass, landfill gas, waste heat and solar. The financial attributes of these renewableoptions are based on the TAG database and have been adjusted based on PacifiCorp’s recentconstruction and study experience.The geothermal resource is a dual flash design with a wet cooling tower. This concept would besimilar to an expansion of the Blundell Plant. 33 Speculative risks associated with steam field development,as well as recent escalation in drilling costs, are not captured in the geothermal costcharacterization. Note that at the time that PacifiCorp was deciding how to address renewable33 A single flash expansion study was performed for Blundell unit 3 and filed with the state commissions in March2007. The report is available on the Utah Public Service Commissions web site at:http://www.psc.state.ut.us/elec/05docs/0503554/3-20-07Exhibit%20B.doc.101