Shaqir Rexhepi¹, Vezir Rexhepi^2,, Rexhep Shaqiri³, Beson Lushi⁴

This study examines the power loss of an electrical substation where wind turbines are connected to transmit power from the respective substations, as well as the economic implications on return on capital and investment among other economic factors. The modeling of wind turbines, their impact on the voltage profile and their financial consequences are all included in the analysis. The study discusses and elaborates the findings, making judgments on the cost of energy and its growth by the characteristics addressed. In determining the results of the operation and integration of wind turbines, especially their effects on the power grid, with a focus on the voltage profile, energy losses and their financial implications, the conclusions are based on simulation and comparative techniques. Findings from relevant modeling and simulations are used in the paper. A case study model of the Selac substation in the rest of the Kosovo power system has been created, which takes into account wind turbines, substations, cable lines, transformers, loads, price indices and the cost of capital return from the investment of the wind turbines. The paper also discusses the economic benefits resulting from improving the voltage profile and power supply by minimizing active and reactive power losses. Therefore, the paper examines the relevance between financial investments of renewable wind sources and the impacts of electrical losses on the economic performance of these investments.

Financial Investments, Return Capital, Energy Cost, Wind Turbines, Power Losses and Voltage