This paper begins by generally describing hydro power plants and their parts, as well as mentioning the biggest hydro power plants in the world. This is followed by a description of small hydro power plants, their construction and the two types of small hydro developments. In addition, we look at some of the formulas required for calculation that takes place at the end of the paper. Before the very calculation, we have a detailed description of every type of turbine we used, as well as tables of formulas for flow and efficiency of each turbine. Using the mentioned tables and calculating these formulas, we obtained an efficiency curve for each turbine. Furthermore, the terms for total production of energy on a daily, monthly and yearly basis are written down. By calculating the terms at the very end of the paper, we obtained the tables for total production. These are substantiated with corresponding diagram of production of energy on a monthly basis.