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Table 2.2 <br />Historical Power Generation and Water Use <br />Craig Station Units 1, 2, and 3 <br /> <br /> <br />Year <br />Energy <br />production Water <br /> <br />Diversion <br />acre-feet <br />Acre-feet/ <br />GWHRi <br />Capacity Factor <br />(GWHR) (acre-feet) <br />1985 6,469 10,637 1.64 58.4 percent <br />1986 5,911 9,416 1.59 53.4 percent <br />1987 7,084 9.071 1.28 64.0 ercent <br />1988 8,255 12,622 1.53 74.6 percent <br />1989 8,749 12,320 1.41 79.0 percent <br />1990 8,531 12,982 1.52 77.0 ercent <br />1991 8,162 11,756 1.44 73.7 percent <br />Avg. 7,594 11,258 1.49 68.6 percent <br />GWHR = Gigawatt-hour <br />Tri-State and the other Yampa Project Participants also own significant storage reserves, <br />intended to ensure the reliability of the water supply for the Craig Station. Specifically, <br />the Yampa Project Participants own 8,754 acre-feet of the storage in Elkhead Creek <br />Reservoir and Tri-State owns 4,000 acre-feet of storage in Yamcolo Reservoir and 7,000 <br />acre-feet of storage in Stagecoach Reservoir According to the respective ownership <br />interests and internal agreements for the operation of the Craig Station facilities, the <br />Elkhead Reservoir water is intended for supplemental supply to Craig Units 1 and 2, the <br />Yamcolo water is reserved for Craig Unit 3 and the Stagecoach water can be used for all <br />three units, if needed. <br />In 1992, Tri-State negotiated a water management plan with the United States Fish and <br />Wildlife Service to provide a level of protection for the Yampa River streamflows <br />downstream of the Craig Station diversion. This management plan affects only the use of <br />the Wessels Canal water right for power generation at Craig Unit 3 and does not impact <br />the operations of the other water rights or the uses at Units 1 and 2. The management plan <br />requires that when the flow of the Yampa River, as measured at the Craig stream gage, is <br />less than the negotiated target flow levels during the months of August, September, and <br />October, Tri-State will forego diversions under the Wessels direct flow water right. When <br />this target flow restriction applies, Tri-State will instead use up to 2,000 acre-feet of <br />storage water from its Yamcolo Reservoir account to satisfy the remaining demands of <br />Unit 3. The adopted target flow rates are as follows: <br />Table 2.3 <br />Target Flows Restricting Use of Wessels Right <br />Month Tar et Flow Monthl E uivalent <br />Au ust 150 cfs 9,223 acre-feet/month <br />Se tember 110 cfs 6,546 acre-feet/month <br />October 115 cfs 7,071 acre-feet/month <br />Yampa River Basin Information 2-8 <br />