Renewable energy and hydropower utilization tendency worldwide

Tidal energy could convert into power on the basis of height difference (Tidal Barrages) and on the basis of flow speed (Tidal Current). The studies have shown that tidal barrages have some disadvantages concerning the environmental impacts and the limits of availability of economic sites. Tidal current seems to have much advantages concerning the environmental impacts and technology advancement and simplicity in application. This article discusses the tendency of utilization of small hydropower energy generation system in the coming decades regarding the concern of environment impacts and electricity needs worldwide.