Journal of Information & Systems Management Goce Bozinovski and Atanas Iliev 12 1 2022 https://doi.org/10.6025/jism/2022/12/1/8-12 https://www.dline.info/jism/fulltext/v12n1/jismv12n1_2.pdf In this work we have analysed the energy contribution of the major water basin and studied how the hydro power plants of the cascade on hydroenergy system works. The studied hydro energy system consists of two cascade hydro power plants and three reservoirs, but the operation experiences and the site location give the possibility to upgrade the system with additional hydro power plants. We did the technical calculations and power improvement are the base platform to make the economical evaluation of the NPV, B/C, PBP values for each power plant from all over integrated hydro energy system. The geographical configuration of the terrain and hydrological conditions of the region, especially the tributaries of the studied river, and allow construction of more hydropower plants. These hydro power plants would improve the energy situation, and also would regulate the operating mode of existing HPP. This study analyzed more the hydropower projects in the studied basin which are analyzed and planned for long time. The testing data is presented in the paper which are the energy production and economic viability of the construction and operation in power system.