According to the objectives of EU energy policy, and in accordance with the so-called package "20–20–20" in all countries of South-Eastern Europe, including in Serbia, as well as the Republic of Srpska question of building new power plants which use renewable sources is becoming increasingly topical. The aspects of the protection of the environment and the expected increased demand for electricity imposed improving technology for the production of energy from renewable sources (with a drop in the price of these technologies) and the introduction of economic objectification in energetic over the market. An important issue when making investment decisions related to the construction of new power plants based on renewable energy sources is to make optimal selection of technologies for the best integration of new power plants in the electricity system, taking into account the physical limitations (voltage level, load flow …) network. Standard tools for energy optimization HOMER, no possibility of network analysis and therefore need coupling with some of the tools for network analysis, for example. DIgSILENT, in order to respect the physical limitations of the network. These additional restrictions, imposed by the network, change the order of the economically optimum ranked variants proposed by the software-tool HOMER. This work its part of the methods' formulation explains the methodology and initial implementation of the related set of tools HOMER-DIgSILENT, and then, through the example of the analysis of the possible construction of new power plants which use renewable energy sources (photovoltaic power plant) connected to the transmission electricity network, considers optimal planning variants taking into account the market. The integrated parametric tool is considered to be an integrated, parametric tool be of importance to decision-makers, consultants and contractors, and will have significant commercial potential.
