d. OTV propellant may be reduced by launching HLLV's from an equatorial launch site and thereby deleting the plane change requirement. This opportunity also deserves additional study. e. The total costs cited above are based upon first estimates of acquisition and operating costs of the transportation elements. These costs will, in fact, be rate-dependent and this fact requires consideration in further studies. Additionally, the costs, particularly for the electric propulsion components, are highly speculative and require significant effort to arrive ar.. The transportation costs are a dominant factor in the current uncertainty of the ultimate economic feasibility of solar power from space and requires significant effort to reduce this uncertainty. Additional analyses of the space transportation scenario output are provided in Section VII Integrated Operations and Section XI Program Costs and Economic Analysis.
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