PacifiCorp 2007 Integrated Resource Plan (May 30, 2007)

PacifiCorp – 2007 IRPChapter 5 – Resource Optionsresources in the IRP models, the renewable production tax credit was in effect only through theend of 2007, and the company did not include the credit in its geothermal project economicanalyses. This treatment reflects the view that year-to-year tax credit extensions do not benefitprojects with long development periods typical of a new geothermal plant.The biomass project would involve the combustion of whole trees that would be grown in a plantationsetting, presumably in the Pacific Northwest. The TAG database used a western Washingtonsite. The solar resource available in the TAG database is a solar thermal system using parabolictrough technology with natural gas backup. Such systems have been installed in the southernCalifornia desert for many years. Cost and performance of these trough systems are wellknown.Combined Heat and Power and Other Distributed Generation AlternativesA number of different CHP applications were developed. These options were not derived fromthe EPRI TAG since the license purchased from EPRI was for larger power generation applications.Costs for the CHP options listed come from a 2003 paper from the National RenewableEnergy Laboratory (NREL) entitled “Gas-fired Distributed Energy Resource Technology Characterizations”,and were adjusted for recent construction cost increases. CHP options includesmall (one megawatt or less) internal combustion engines with water jacket heat recovery, small(five megawatts or less) combustion turbines with exhaust gas heat recovery, non-combustionturbine based steam turbines (topping turbine cycle) systems to utilize process steam in industrialapplications, and larger (40 to 120 megawatts) combustion turbines with significant steam basedheat recovery from the flue gas. A large CHP concept has not been included in PacifiCorp’seastern service territory due to a lack of large potential industrial applications. These CHP opportunitiesare site-specific, and the generic options presented in the supply-side resource optionstable are not intended to represent any particular project or opportunity.In order to derive an estimate of potential CHP capacity availability within PacifiCorp’s serviceterritory for modeling purposes, PacifiCorp surveyed its Customer Account Managers for projectopportunities and reviewed existing customer account data. A list of strong CHP prospects wasdeveloped. Based on the generic CHP resource capacities used in the supply-side resource optionstables, PacifiCorp determined the number of CHP resources to include as options for selectionby the Capacity Expansion Module. Table 5.5 profiles these CHP options by east and westsidelocation.Table 5.5 – CHP Potential ProspectsStrongProspects(MW)Total CHPCapacity Modeled(MW)CHPCHPLocation25 MW Unit 5 MW UnitEast 103 3 units 5 units 100West 66 2 units 2 units 60Energy StorageThe storage of energy is represented in the supply-side resource options table with three systems.The three systems are advanced battery applications, pumped hydro and compressed air energy102