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Goal of the contribution is to present results of the economical analysis of the photovoltaic systems that fulfill present limits, stated by the legislative of the Slovak Republic. Comparative method is realized on one of the buildings from the state sector in the city from eastern Slovakia with goal to find out optimal using of installed photovoltaic system with performance 100kWp. Comparison is realized and searched from the view of the client and its main task is to determine solution with biggest contribution for the client. Comparison of the systems ON GRID with supplement of leftovers and ON GRID with total supplement to the distribution net is made from the view of state support by the way of repurchase prices for the correspondent installed power plants.

Renewable energy sources – RES are one of the main tools that have to lead European Union to the achievement of the energetic policy goals. Contribution deals with analysis of individual RES using. Attention is given to the description of the conveniences and defining of barrier for chosen RES. We have made prognosis of RES development to 2020 and we analyzed in details future development of RES using in condition of Slovak Republic and in other chosen countries of EU. More factors resulted from the performed analysis that will be considered in the contribution.