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01248 D-R-A-F-T P:\User\Thomas\95Rate\Pwrpnt I.wpl May 12. 1993 winter months into the spring months. Also, the magnitude and frequency of Crystal bypasses will most likely increase. This could cause a change in annual energy generation for the Aspinall units. Sensltlvlties . Current operational changes at Flaming Gorge Dam create a two-fold dollar impact to Western. The first is Western's requirement to purchase higher- cost replacement power during the high demand winter season. The second is Western's foregone revenue as a result of generating a reduced-value resource during the low demand spring season. . Anticipated operational changes at Glen Canyon Dam will impose a dollar impact on Western much like Flaming Gorge. A shift of releases within each year would cause a corresponding shift in the dollar value Western places on the energy generated at various times through the year, and a potential increase in purchased power expenses. . Possible operational changes at the Aspinall units of the Gunnison River will most likely increase Western's purchased power costs. ( Alternatives/Options \ . Based on discussion with Reclamation (R. Peterson, April 1993), long-term annual energy generated at Flaming Gorge is expected to remain unchanged. The shift of energy generation within each year can only be evaluated on the basis of purchased power impacts. To do this, Western is currently collecting data under the constraints of the Bio-Opinion and preparing a comparative base case of Flaming Gorge operations without constraints. . Until the publication of the draft GCD-EIS and the identification of a preferred alternative, Western can only presume which operational changes will be implemented and assume that any operational change scenario will result in greater purchased power costs. Purchased power expenses under interim operations have been assessed using historical operations to develop a base case and used for comparison of purchased power expenses under current interim operations. However, the Glen Canyon Dam operational alternatives which include habitat maintenance flows and beach- building flows have not yet been modeled. . Western anticipates that operational changes at the Aspinall Units will result in an increase in purchased power costs, although it wi 11 not be known for some time what changes will be eventually implemented. Recommendations '3