A wind turbine consists of a wind generator that converts mechanical energy into electrical energy.
Mechanical energy comes from the force of the wind that rotates the blades of the wind turbine through a direct current alternator.
The minimum wind speed for the wind turbine to produce energy is 4m/s.
There are small domestic wind turbines from 100 W to 30 kW. For instance 1 kW of power delivered for one hour gives 1kWh.
Similarly as photovoltaic panels, it is possible to connect it to the grid or to store in batteries.
In Portugal, an individual who wants to put wind energy into his house connected to the electricity grid, must submit a project to the energy distributor. If approved, the customer will be responsible for all expenses related to the equipment and the new meter that will record the energy input and output.