this potential fully, a mature SPS system should not comprise equal numbers of satellites and rectennas but should contain more rectennas than satellites, at least some of which should provide power intermittently to several different rectennas. The operation of rectennas at low load factors would be more attractive the lower was the capital cost per kilowatt of the rectenna. The potential benefits of more flexible power supply therefore constitute an additional incentive to design low cost-per-kilowatt rectennas. A promising means of reducing the rectennas cost per kilowatt would be to use rectennas designed to receive power from two or more satellites simultaneously [4], The cost of a rectenna capable of handling the output of two satellites would be between 132% and 145% of the cost of a single capacity rectenna [5]. Consequently a rectenna uprated to double its initial capacity would be economical to operate at lower load factors. Flexible SPS Operation There are several different ways in which the potential flexibility of a system of SPSs could be utilised to follow the loads at different rectenna sites as they vary over the time of day or year.
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