Starting from the existing wind energy potential in Romania, from the possibilities of recovery and its use by developing wind power parks / farms in appropriate areas, the paper presents some research conducted both globally, but, also, at the national level, for developing and testing of hydrostatic transmissions, in order to be use in the wind power plants, instead of the existing mechanical transmission (gear-box). The results showed a flexible dynamic behavior, energy efficiency and possibilities of increasing the energy efficiency in mechanical energy conversion chain of wind power into electric power, through hydrostatic transmission, which offers the advantages of high power density and an increased dynamic adaptive capacity at strong variation of the wind turbine speed, at the required quasi-constant speed at the electrical generator.