Water is one of the oldest sources for energy production. It is a renewable, abundant and clean source. Hydroelectric power is the main source of non-fossil energy generation. For many countries, hlike Norway, Brazil, Canada and Venezuela, hydroelectric power is an important source of electricity production. Every year, in various parts of the world, there are continuous and growing works of modernisation or construction from scratch of dams and barriers on the main waterways and water basins in order to collect, convey and exploit water availability for energy production. Most of the increase in the generation of hydroelectric power is taking place in emerging countries, especially in China, India and Brazil.
