158 



MULTIPLE PURPOSE RIVER DEVELOPMENT 



TABLE 26. Costs and Gains frotji Integrated Operation of Two-Dam Plan 



and from Operation of Idaho Power Company Three-Dam Plan 

 as Isolated Sub-System 



Operation of Operation of Gains from 



Three Dams in Two Dams in Two Dams 



IPC Isolated Integrated over 



Item Sub-System Federal System Three Dams 



(kilowatts) (kilowatts) (kilowatts) 



Average annual generation of 



prime power 669,000 » 711,000 " 42,000 



($ thousand) ($ thousand) (| thousand) 



Value of prime power at $41.58 



per kw 27,817 29,563 1,746 



Value of flood protection 1,400 1.800 400 



Value of navigation services 100 150 50 



Total average annual value of 



added benefits 29,317 31,513 2,196 



Total average annual costs " .... 15,869 15,397 472 



Total average annual economic 

 gains 2,668 



' FPC, Staff Brief, op. cit., Appendix A, p. 17, Witness Hogg's estimate appro- 

 priate to an eight-month critical period. 



'• Based on Witness Meadowcroft's estimate, ibid., Appendix A, p. 16. See also 

 Table 23, note a. 



•= See Tables 22 and 24. 



These estimates assume a cyclical storage drawdown in which the 

 stored water would be utilized to meet deficiencies arising over a 

 critical period of thirty-two months. The estimates would be 

 smaller if the facilities in the Hells Canyon Reach were operated 

 independently of the constraint to achieve maximum system output. 

 Assuming annual drawdown — although the following estimate is 

 only a crude approxiniation ^3 — output from the three dams under 

 independent management would approximate 567,000 kilowatts at 



^ Witness Hogg for Idaho Power Company employed reservoir operating 

 assumptions for his estimates of prime power which clearly indicated drawdown 

 and refilling on an annual basis (FPC, Transcript of Hearing, op. cit., pp. 5716, 

 5730) and operations to maximize output from an isolated development (ibid., 

 pp. 3495, 5658-59). Tiie figures presented in the text, therefore, represent his 

 estimate of prime power, which assumes an eight-month critical period. 



