SURPLUS HEAT Many industrial enterprises have a challenge with surplus heat. The heat may originate from cooling or special processes. The heat is considered surplus when the enterprise cannot utilize it itself, and it often ends with the heat being cooled to the atmosphere or into a water source. At best this will be a waste of resources, but often flora and fauna in the recipient will suffer. And this really is a shame. We must stop considering surplus heat as a waste problem. For the enterprise's own sake and for the sake of the society, we must regard it as a resource. Heat, especially surplus heat, is a low-quality energy source. It is not only wasted in industrial plants, but also in the energy sector. Even today, many power plants waste maybe 60% of the production, which is transformed into heat and not power. The use of cogeneration technology can solve these problems if there is a districting heating network nearby. One of the benefits of the district heating and perhaps its primary raison d'être is the ability to utilize low-quality energy source.