Many micro-hydro schemes are remote

Many micro-hydro schemes are remote from the mains grid, and a local grid is constructed to distribute the electrical power.The output from the generator must match the demand for electric power on the local grid, otherwise the voltage and frequency can vary suddenly which can damage some electrical equipment. The demand for power in an off-grid system is often very variable, because people switch lights and machines on and off, so the supply from the micro-hydro system must be varied to keep close control. This can be done by varying the water flow, or by using an electronic load controller.”