PacifiCorp 2007 Integrated Resource Plan (May 30, 2007)

PacifiCorp – 2007 IRPChapter 4 – Resource Needs AssessmentFigure 4.8 – Average Monthly and Annual East Energy Balances2,0001,5001,000500MWa0(500)(1,000)(1,500)(2,000)(2,500)(3,000)Annual BalanceMonthly Balance(3,500)Jan-07Apr-07Jul-07Oct-07Jan-08Apr-08Jul-08Oct-08Jan-09Apr-09Jul-09Oct-09Jan-10Apr-10Jul-10Oct-10Jan-11Apr-11Load and Resource Balance ConclusionsJul-11Oct-11Jan-12Apr-12Jul-12Oct-12Jan-13Apr-13Jul-13Oct-13Jan-14Apr-14Jul-14Oct-14Jan-15Apr-15Jul-15Oct-15Jan-16Apr-16Jul-16Oct-16The company projects a summer peak resource deficit for the PacifiCorp system beginning in2008 to 2010, depending on the planning reserve margin assumed. The PacifiCorp deficits priorto 2011 to 2012 will be met by additional renewables, demand side programs, and market purchases.The company will consider other options during this time frame if they are cost-effectiveand provide other system benefits. This could include acceleration of a natural gas plant to complementthe accelerated and expanded acquisition of renewable wind facilities. Then beginningin 2011 to 2012, base load, intermediate load, or both types of resource additions will be necessaryto cover the widening capacity and annual energy deficits. The capacity balance at a 12 percentplanning reserve margin indicates the start of a deficit beginning in 2010—the system isshort by 791 megawatts. This capacity deficit increases to 2,400 megawatts in 2012 and then toalmost 3,200 megawatts in 2016. On an annual basis, and disregarding economic considerations,the company becomes deficit with respect to energy by 2009.87