Nuclear Cogeneration refers to the simultaneous production of useful thermal energy and electrical energy using nuclear reactor as a heat source. Typical modern water-cooled reactor produces heat at a relatively low temperature, slightly in excess of 300oC. This limits the possibility of using today available nuclear reactors for electricity generation and low-temperature applications, for example as a heat source for district heating systems. Some of the new types of reactor like High Temperature Reactors (HTR) will open the possibilities to provide useful heat for many industrial processes. The industrial process heat market today is at least of the same size as the electricity market and almost entirely based on combustion of fossil. New, emission-free heat source not only will reduce CO2 emissions, consumption of natural gas and crude oil in refineries, fertilizer plants, but also will open an option of the chemical coal processing with strongly limited CO2 emission.