Variable Definition Nominal Value Time subscript (years) Number of years from time of first unit cost expenditure to 2000 Discount rate (%) Date of initial operating capability for supplying electric energy to the grid from the demonstration satellite (year) Date of initial operating capability for supplying electric energy to the grid from the SPS operational satellite (year) Annual nontransportation investment cost of demonstration satellite ($/year) Annual transportation investment of demonstration satellite ($/year) Cumulative average learning rate for SPS nontransportation costs (%) Cumulative average learning rate for SPS transportation costs (%) Average cost of energy from non-SPS sources displaced by SPS in year i (mills/kWh) Cost of energy from SPS in year i (mills/kWh) Demonstration satellite power available to grid (kW)
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