exclusively on the process energy requirements. No reference was made to operating energy requirements nor to indirect energy uses. Furthermore, the reference was explicit in stating that it was including only a partial calculation of the energies required. The same situation exists with respect to the JSC presentation (Ref. Al3) which showed a 0.78 year energy payback for a 10-GW station based only on materials. 4. Components of Energy Subsidy The major components of the energy subsidy are identified in Exhibit 44 both by their energy source in the economy, and by SSPS component. In keeping with the DSI methodology, capital energies, i.e., those required for initial construction, are analyzed separately from annual operating energies. The initial construction of a 5-GW SSPS would require approximately 12 12 440 x 10 Btu. This represents an average energy cost of 14.7 x 10 Btu 12 per year over a 30-year life for the system; or 22 x 10 Btu over a 20-year amortization. The input-output coefficients used to generate these energy estimates also permit the allocation of this energy by source within the economy. Using these coefficients, it would appear coal energy will account for approximately 29% of the capital energies required, crude oil and natural gas for approximately 61%, and the balance of approximately 10% will come from other electrical sources, notably hydroelectric and nuclear power generation. The mix of energy sources shown in Exhibit 44 , and in the following exhibits from which it is derived, reflect conditions as of 1974. The mix does not represent a projection of the energies required for construction and operation of the SSPS in the future. The primary purpose of this analysis is to define the overall energy subsidy required for the SSPS as compared to other power generation technologies. To the extent that the methodology is at least approximately accurate in defining total energy requirements, the ranking of Exhibits 42 and 43 is also accurate. The mix among energy sources is presented primarily for informational and illustrative purposes and should not affect the rank order of alternative systems. While the mix of energy sources for the U.S. economy will clearly change between now and initial operation of the SSPS, these changes in mix would
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