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';'\ 1.1.. 9, '........] .. r) ,J fl ,>A (,-~ iiJ .1 U ~"'" tJ ::~:t ;~;' .' i,,'J "'I fJ ~>} '( '5 ',:< ~:j F~} ,',1 ",:':1 ",'.. LJ fi t.:~.; :~: '~ ;:,:-,~ "J 1'::] ',- ~ :i.~j o o ,) m ~ C,.Il OPTIONAL HYDROPOWER PLANTS Potential hydropower installations have been evaluated at Red Mountain Dam, Azure Dam and Una Dam. A hydropower retrofit with smaller turbines has been evaluated at Green Mountain Power Plant. Hydropower plants have been considered as optional features. Investment costs and potential hydropower benefits have not been included in Exchange Project costs. No market study has been conducted, however, based on filed purchase payment rates of the Public Service Company of Colorado, the Azure plant would earn an 8 percent return over its estimated annu,alized investment and operation cost of $0.036 per kWh. The financial potential of other plants in Table S.3 can be judged relative to Azure; Red MOl,lntain and Green Mountain plants would be less attractive and the Una plant more attractive. TABLE S.3 PROJECTED HYDROPOWER GENERATION AND ESTIMATED PRODUCTION COST SITES ANNUAL PRODUCTION CAPACITY GENERATION COST kW GWh 1$/kWh) 1300 3.4 0.111 7000 36,2 0.036 17,600 88.5 0.019 3000 6.2 0.057 Red Mountain Azure Una Green Mountain Note: Units shown are kilowatt (kW) and gigawatt hour (GWh). (1 GWh = 1,000,000 kWh). 15