Fig. 2. Demand profile of a 5-person-household with complete electrical equipment and PV system (summer). could be overload conditions for distribution systems in single-family and two-family house areas with large density of photovoltaics due to the power infeed. Evaluation of the Effects This remains as final result: Through the terrestrial decentral application under central European climate neither power plant capacity nor grid capacity can be saved. Only energy and thus fuel may be substituted. On closer examination of these correlations it becomes obvious that during the summertime, i.e., a time when solar power generation supplies a noticeable share, mainly medium load power plants are replaced, the fuel costs of which are below those of the thermal peak load power plants. Furthermore the different standards of value for the kWh fed into the system by the customer in summer — in relation to those not fed in winter — influence the remuneration for solar-generated power. As further disadvantage it has to be considered that thermal power plant units show an increased fuel requirement per kilowatt hour during operation with reduced capacity and therefore operate more uneconomical. The fuel quantity saved is thus smaller than the product from the power infeed from photovoltaic systems and the
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