Fig. 6. Capacity and energy savings installed PV capacity: 5000 MWp annual load peak: 51,700 MW IBRD 1980). From the energy-economical point of view the eclipse periods do therefore not present any essential problems as long as the installed photovoltaic capacity only amounts to a fraction of the total conventional power plant capacity. Only the switching procedures must be solved technically, e.g., through gradually changing in time the capacity over on to other power plants, in order to guarantee voltage and frequency stability. Besides these seasonal or cyclic power losses, which can be foreseen and scheduled, there may be some less foreseeable short time variations. Due to the Earth- synchronous rotation movement of the solar cell areau, continuous new alignment of the cells to the sun is required. Therefore, the Earth alignment of the transmitting antenna needs to be corrected continuously as well. As the correction commands, determined from the deviations of the microwave beam when fitting the receiving antenna, need approximately 0.3 sec for bridging the distance Earth-satellite-Earth, a permanent minor power variation in the 3 cycles range is to be expected. This problem can be solved safely through a sufficiently large power plant interconnection as the revolving masses of the conventional plants do then dispose of sufficient energy reserves.
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