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This study analyzes whether the introduction of a European smart grid, comprising of a compound of national smart grids, is economically worthwhile. Therefore, ten national cost-benefit-analyses are analyzed, which either address solely the implementation of smart meters or the implementation of national smart grids. Smart meters are regarded as a necessary precondition for the implementation of national smart grids involving private households. Thus, also an analysis of those studies, whose scope is limited, is beneficial. The studies are evaluated in regards to type, height, and distribution of the respective cost- and benefit-parameters. Although distributional effects are not subject to classical cost-benefit-analyses, considering them is significant for this study. Only thereby policy recommendations can be framed that offer state incentive regulations to those actors bearing the highest financial burden. In addition, own calculations are made in order to corroborate the cost- and benefit-analysis of smart grids. These analyze on the one hand the energy saving effect in private households fostered by smart grids, and on the other hand the capacity effect, which quantifies monetarily the reduction of peak load capacities through load shift during off-peak times. Finally, the costs for the necessary infrastructure update for grids are quantified. This study is based on the hypothesis that the future energy system needs to be able to integrate a higher share of renewable energy sources. This allows the following thesis: the costs of a so called dumb grid with a high share of renewable energy sources are higher then those of a smart grid as in the second case synergies can be exploited, load shift can take place, and, therefore, less infrastructure update is necessary. Under the premises that the future energy mix has to include a significant share of renewable energy sources smart grids, hence, create opportunity benefits.