Trans-regional development project “Central Baltic cooperation in energy efficiency and feasibility in urban planning - ENEF” (further on “ENEF”) focuses on cooperation and joint problem-solving of energy efficiency matters in Central Baltic region in Estonia (EST), Finland (FIN), Sweden (SWE) and Latvia (LV), managed and coordinated by leading 4 technological universities in the Baltic Sea Region. This ENEF project focuses more narrowly on the analysis of: 1. Publicly used buildings, mainly like schools, universities and libraries. 2. Private residential apartment buildings built in 1960-1980. This ENEF project focuses on 2 aspects: 1) How to renovate old buildings by making them more energy efficient based on selected case studies and analysis; 2) What are the criterias, calculations and methods that should be taken into account in planning and designing new buildings (taken into account selected case studies). ENEF project focuses of 5 topics in WPs: 1) Project planning and launching phase in WP1, project management, monitoring and evaluation. 2) Network development and activation phase (WP2) to transfer innovative practices and tools to regional and municipal planners, architects, engineers of construction companies, etc. 3) WP3-development of the practical handbook of best practices in EST, FIN, SWE and LV (max 150 pages with illustrated examples and photos of selected audited and analysed houses and public buildings with provided solutions of how to increase energy efficiency). Handbook will also consist of practical examples of energy efficient buildings and how to use different tools such as existing laboratories in universities and simulation programmes for measuring energy efficiency. 4) WP4-promotion and awareness raising of better use and application of computer based simulation systems for higher energy efficiency (residential buildings built in 1960-1980) and public buildings, such as kinder-gardens, schools, universitities and libraries. The aim of this kind of analysis and promotional work is to ensure higher quality and level of energy efficiency on all different levels of urban planning and construction to avoid deviations in planning of future buildings and renovating existing ones. 5) WP5–organisation of the international conference and exhibition of the models of the energy efficient buildings. Involving students, researchers, companies and city planners from 4 regions. Through regional team-building, calculating and using simulations and laboratories,- preparation of the models of energy efficient "sample" builldings", and finally–presenting each the models at the international “Exhibition of models of energy efficient public buildings” in 2013. Achievements: The ENEF project set about increasing the awareness of and know-how in maintaining and designing buildings to reach higher energy efficiency and sought to support the transfer of innovation into practical applications. To achieve the aims, the ENEF project developed a network to transfer innovative energy efficiency practices and tools to regional and municipal planners, architects and engineers. In addition, the project produced a practical energy efficiency handbook and also organised promotion and awareness activities for the better use and application of computer-based simulation systems. An exhibition of the models of energy-efficient buildings was also organised.