Wind power comes from transforming wind currents into forms of mechanical and electrical energy. People have learned to harness this type of energy a long time ago, they used it to propel their ships and sailboats and then later, they used it for windmills. Whether to grind, press or pump water, the mechanism of a windmill is triggered by a propeller, which in turn, uses air currents.
In time, windmills that harnessed kinetic energy and turned it into the mechanical type have evolved into turbines. This has happened in the USA back in the nineteenth century. More recently, as people realized that fossil fuels are finite and pollute the environment, the use of wind power became more and more prevalent.
A wind turbine functions on a simple principle that is fairly easy to grasp: wind causes the propellers of a turbine to move, propellers which in turn, activate an electrical generator. Certain wind turbine models can be fitted with batteries, to stock energy. When it comes to wind farms though, where tens of even hundreds of wind turbines function, the energy is transferred into the electrical grid and then used by households and factories connected to said grid.
Wind power is 100 percent renewable, the costs of harnessing it are small and performance is increasing. These factors contribute to a market in constant growth, much to the satisfactions of the ones who invested in this niche. In Romania, 3 percent of all produced energy comes from wind power, with a clear tendency of growth as the price of wind turbine-produced KW drops. Starting with 2011, this country harnesses 850 MW, more than the nuclear power plant of Cernavoda.