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DOOR is a civil society organization of experts devoted to the promotion of sustainable energy development, founded in 2003. We have successfully implemented more than 75 projects with goals ranging from climate change mitigation, encouraging citizens’ participation in sustainable energy policy-making, improving education about renewable energy sources and alleviating energy poverty. Within their projects they have organized more than hundred workshops, round tables, trainings, conferences and other public events attended by several thousand participants, we published a dozen manuals, organized a number of study trips and established continuous cooperation with numerous organizations from Croatia and abroad.