1. System studies - $10 to $14 million 2. Environmental analysis and tests - $5 to $6 million 3. Microwave conversion and control - $10 to $12 million 4. Structure (thermal and materials) - $7 to $9 million 5. Orbit transfer propulsion, exploratory technology - $7 to $9 million Commitment to the technology advancement phase would occur in 1979, assuming favorable results from the initial program phase. The technology advancement phase is estimated to cost $4 to $6 billion over a period of about 10 years. The peak annual funding for this phase would be about $2.0 billion in the 1985-87 time frame. The major cost element of the phase would be the development of techniques and the subsequent construction and evaluation of a subscale system in orbit. The system development phase (initiated 1987) would involve commitment to a multibillion per year program of 8 to 10 years' duration. The total cost is estimated to be $45 to $55 billion, with the major cost elements being development and verification of space transportation systems ($9 to $12 billion), solar power satellite systems ($19 to $22 billion) and orbital construction facilities ($16 to $19 billion). Expenditures for the final commercialization phase would depend primarily upon SPS unit costs, space transportation costs, and rate of installation. Initial estimates of these costs are given in section XI of this report.
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