In this work with the title "Assessment of the regulatory framework for wind power (RES-E) in Croatia" the future of the wind power energy in Croatia until 2020 is the main object of the interest. Wind power is a renewable energy form, and because of this fact, it is an interesting possibility for generating "green" and "proper" energy on the territory of Croatia. Furthermore, the country Croatia is a member candidate for the European Union (EU), and therefore the political and regulatory framework for the energy market in Croatia has to be adjusted to the guidelines of the EU. This work is separated into several parts: at the beginning, the economic and energy situation of the country Croatia is described. Then the current status of the wind en-ergy plants is discussed; additionally, the planned projects "under construction" are mentioned, too. The main winds and the suitable sites for wind energy production in Croatia are taken under consideration, too; you can see, the onshore winds and sites are more suitable for energy production than the offshore winds/sites. For estimating the realisable wind energy potential of Croatia until 2020, the method of the so called dynamic cost-resource curves resp. dynamic cost-potential curves is discussed and introduced, which has been already used for calculating the energy potential of re-newable energies in general (RES-E) in the EU, but not yet for Croatia. The best im-plementation of the dynamic cost-potential curve discussion is the so called Green-X model, which is described in the framework of this work, too. Also the Green X model has already been used for the calculation of the wind energy potential within the EU, but not for Croatia until now. So this work gives an impression of the Green X model applied on the situation of the EU. Furthermore, it depicts the "state of art" in the research of the realisable wind potential in Croatia until 2020, too. The result is that a potential of roundabout 1200 kW in the year 2020 can be expected for Croatia. This work understands itself as a pre-study for the implementation of the Green X model for the realisable wind energy potential in Croatia, for which in future still more scientific research has to be done. At the end of this work, some conclusions and recommendations for a realistic wind energy policy in Croatia are made.