Small-scale micro hydro power is both an efficient and reliable form of energy. However, there are certain disadvantages that should be considered before constructing a small hydro power system. First, it needs a suitable site where distance from the power source to the location where energy is required is not too far. Another problem is that the size and flow of small streams may restrict future site expansion as the power demand increases. Also, during the summer months there will likely be less flow and therefore less power output