By becoming a full member of EU on 1. July 2013, the Republic of Croatia, along with other member states, has committed to implement the objectives of the Europe 2020 strategy. Under the provisions of Article 5 of the Energy Efficiency Directive, and in order to meet the minimum energy performance requirements, from 1 January 2014 each EU member state will ensure annual 3.0% renewal of the total surface area of heated and/or cooled buildings owned and operated by central government. This paper provides an overview of the legislative framework for the implementation of energy renewal of public sector buildings, in line with the EU Energy Efficiency Directives. By joining the European Union, European funds that follow the guidelines for successful implementation of all the goals set have been made available to the Republic of Croatia. The total available funds and the entire process of withdrawing funds for energy renewal of buildings are shown in the paper. By analyzing and collecting data from all Croatian programmes implemented so far, there is an overview of the savings realized by using different models of energy renewal of buildings. From 2014 until the writing of this paper, a total of two models of energy renewal of public sector buildings have been implemented in Croatia. Model I is contracting energy renewal works with the help of grants from the ESI Funds and the Environmental Protection and Energy Efficiency Fund. Model II (ESCO Model) is actually a model for contracting energy services that was co-financed by the Environmental Protection and Energy Efficiency Fund. Both models not only bring financial and substantial energy savings to buildings (more than 50%), but also significantly contribute to environmental protection, reduced emissions, reduced unemployment, and contribute to other indirect effects such as improved quality of life and more visually appealing buildings.