PUB00037 - Laserfiche WebLink

Home Browse Search

I II I I I I I I I I I I I I I I I I I The capacity summary presented on Table 4-1 shows that a total capacity of 450 MW in pumped storage units were added to the system with 150-MW units added in the years 2002 and 2005 and 75-MW units added in 2006 and 2007. Initially, the modeling indicated that 25 MW of pumped storage would be added in 1993, but this capacity requirement was assumed to be met by interutility transactions. Table 4-2 compares the amount and type of capacity added with the base case and pumped storage case under the medium load forecast. Table 4-2 Comparison of Capacity Additions for Base Case and Pumped StoraQe Case - Medium Load Forecast(1) Base Pumped Case Storage Case Difference From Base Case CaD8cltv TVDB LMWl LMWl MW Percent Coal-Fired Units 935 700 -235 -25.1 Combustion Turbines 888 812 -76 -8.6 Combined Cycle 198 0 -198 n/a Pumped Storage Case ---.J1 ~ :1:!5..0. .llLa Total 2,021 1,962 -59 -2.9 (1) The capacity additions reflect additions that were added by the EGEAS program, but some of these additions added before the year 2000 could potentially be purchased or sold to other utilities in the state, as indicated in the last two columns in Tables 3-1 and 4-1. The pumped storage units allow the utilities to replace 509 MW of fossil units with 450 MW of pumped storage. The differences reflect optimization of the mix of fossil and pumped storage capacity additions to minimize the cost of electricity while maintaining the specified reserve margin. Exhibit 2 presents the revenue requirements of the individual base case runs which were summed to provide a statewide total for the cases that included the pumped storage alternative. The amounts are shown for the variable costs (fuel and variable O&M), the fixed costs (capital costs and fixed O&M), and the total for each year from . 4-3