Hammarby Sjöstad – an eco-friendly part of town Hammarby Sjöstad is an exciting district in Stockholm where the City has imposed tough environmental requirements on buildings, technical installations and the traffic environment, from day one. Stockholm Water Company, Fortum and the Stockholm Waste Management Administration have jointly developed a common eco-cycle model designed to ensure organic recycling throughout Hammarby Sjöstad – known as "The Hammarby Model". This model is the thread that binds together the entire environmental programme and demonstrates how the various technical supply systems are integrated.