$15.78/106 Btu. The price for gas is related to the cost of converting coal to gas at an 80% conversion efficiency; the quantity of gas involved includes both coal conversion and natural gas sources. Table 4.45 summarizes these data for the three scenarios, with SPS at the appropriate level of deployment. There are two entries for electricity in each scenario, one for SPS electricity, one for non-SPS electricity. The data in Tables 4.43 through 4.45 provide the basis for the energy expenditures listed in Table 4.46. Net expenditure is the total energy expenditure without SPS, subtracted from the total with SPS. A result greater than zero means that SPS does not trigger enough savings of scarce fuels to offset the increased cost of electricity; a result less than zero indicates the savings are greater than the increased cost of electricity. The calculation of energy expenditures for different SPS electricity prices is straightforward (approximated by a linear function of the SPS electricity price) given the calculations just described. Figure 4.47 shows year-2025 results for all scenarios over the 30-120 mills/kWh range for SPS electric ity. Table 4.45 Energy Use and Prices for 2025 with SPS Deployment at 60 mills/kWh (1978 $) Table 4.46 Energy Expenditures with SPS at 60 mills/kWh and without SPS, for the year 2025 ($ 10$, 1978)
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