- Design, Development, Test & Evaluation (DDT&E) (Range: £ 36 - 48 Billion) - First Unit (5 GW) (Range: £32-38 Billion) - Total Development (Range: £ 72 - 94 Billion) - Capital Investment Requirements per Unit (Range: £ 12 - 24 Billion) Best estimates for research and development costs out of these items evaluated by NASA are given in figure 2.7.2. Figure 2.7.3 presents a cost break-down of capital investment requirements for the commercialisation phase of SPS, which are very preliminarily analysed by NASA: Fig.2.7.3:CAPITAL INVESTMENT REQUIRED PER SPS (PRELIMINARY ESTIMATE BY NASA)
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