Besides the SPS sub-systems cost uncertainties the principle risk factor due to cost accrues from total GEO-mass uncertainty of the overall system (satellite and several facilities and supports.) Figure 2.7.1 gives an idea of the GEO-mass ranging of cost correlated to critical cost-risk areas and a total range of DDT&E and commercial busbar electricity cost uncertainty. I.2.7.5 Preliminary Programme Cost Estimates Fig.2.7.2: SPS PRELIMINARY RESEARCH AND DEVELOPMENT COST ESTIMATE [Source: NASA,79/57] Recent cost estimates for a full duration SPS development and commercialisation programme are performed by NASA. The following cost items are analysed and several cost ranges (in 1977 £) are identified: - Technology Development & Verification (Range: $4-8 Billion)
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