investment, future energy demand, assumed GNP growth rate and other parameters of the economy. For example let us mention the price elasticity of demand, the degree of effective constrain on energy imposed for health and safety, and the price for energy from other alternatives. With these models it is possible to compare projection for different energy prices. Through it is not possible to predict the correct price, higher, nominal and lower levels are predicted in which the price may range. Figure 3.5 below shows the price estimation for the time range between the years 2000 and 2030. Prices for current available energy alternatives can be predicted quite good. They will be about 25 to 40 million dollars (1978)/kWh. If we assume an inflationrate of 5% per year we get the prices in 1992 mills/kWh. Therefor the prices will be between 50 and 80 million dollars (1992)/kWh. To predict the prices for future energy sources like fusion and terrestrial phototvoltaic is more difficult. A high level of uncertainty creates a wide range for its possible price. The price might be in the timeperiod of the years 2000 to 2030 between 30 and 200 million dollars (1978)/kWh (1978). It is very difficult to give exact figures for the development, because the price depends on many factors which cannot be exactly estimated or are even unpredictable. In order to be competitive, the price of energy used on Earth coming from solar space power program should be in an range which is close to the available alternatives.
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