Hydro-power systems use a turbine to convert the energy stored in water flowing downhill into electricity. Useful power may be produced from even a small stream. The hydro-power source should be relatively close to where the power is needed or to a suitable grid connection.

Hydro systems can be grid-connected or form part of an off-grid power system. In a grid-connected system surplus electricity can be sold to electricity companies. In an off-grid system, electricity can be supplied directly to the devices powered or through a battery bank and inverter set up. A back-up power system may be needed to compensate for seasonal variations in water flow.

 

_{Last site update: 30th June 2009}