R. Montanari  in his paper presents an original method for finding the most economically advantageous choice for the installation of micro hydroelectric plants. More precisely, the paper that follows is to be considered in a context defined as “problematic” by those who have the job of constructing water-flow plants with only small head and modest flow rates. Traditional plant solutions using Kaplan or Francis type turbines must be rejected because of the high levels of initial investments. Much more simple configurations must be analyzed, such as plants with propeller turbines or Michel–Banki turbines, in order to reduce the investment costs. The general methodology applied provides a powerful decision-making instrument which is able to define the best plant configuration. The method is based on the use of economic profitability indicators, such as the Net Present Value (NPV), calculated using the plant project parameters, the nominal flow rate and head, and the particular hydrologic characteristics of the site, such as the type of distribution, the average value and the standard deviation of the flow rates in the course of water supplying the plant
S.M.H. Hosseinia, F. Forouzbakhshb, M. Rahimpoor  in their paper a method to calculate the annual energy has presented, as is the program developed using Excel software. This program analyzes and estimates the most important economic indices of a small hydro power plant using the sensitivity analysis method. Another program, developed by Mat lab software, calculates the reliability indices for a number of units of a small hydro power plant with a specified load duration curve using the Monte Carlo method. Ultimately, comparing the technical, economic and reliability indices will determine the optimal installation capacity of a small hydro power plant.
S.K. Singal and R.P.Saini  has presented methodology to determine the correlations for the cost of different components of canal based small hydro power schemes. The cost based on the developed correlations, having different head and capacity, has been compared with the available cost data of the existing hydropower stations. It has been found that these correlations can be used reasonably for the estimation of cost of new canal-based SHP schemes.