The renewable energy sources are currently in a great demand and it is proven that wind energy is a promising source of renewable energy. In winter, when wind turbines are exposed to heavy atmospheric icing conditions, ice formed on the blades causes power loss since ice accretion on blades changes the clean blade aerodynamic characteristics. The amount of wind power loss depends on the amount of ice accumulation on the blades, blade design and turbine control.

Ice is formed when the super-cooled droplets impinge on a solid surface such as a wing, a propeller or a turbine blade. These droplets can stay in a liquid state even at temperatures as low as-40◦ C. Temperature, liquid water content, droplet size and size of body are basic factors affecting icing. Temperature influences the type and intensity of ice. Liquid water content determines the severity of icing, type and shape. Droplet size indicates the type and rate of icing. Size of body determines the rate of ice accretion. Droplets may freeze instantly and form rime ice on the surface or run downstream and freeze later forming glaze ice structure. Rime, glaze and mixed ice are three types of ice formed in the atmospheric icing conditions. Rime ice is formed when super-cooled water droplets from clouds or fog strike a surface and freeze immediately. Rime ice typically forms at temperatures from 0◦ C down to-20◦ C. This kind of ice has milky, opaque appearance with smooth shapes, tends to grow into the airstream, and can be easily removed by de-icing or prevented