Power plants produce electricity, process heat or district heating, according to their task (Stultz and Kitto 1992). Electric power is the only product of a condensation power plant and the main product of a power plant with extraction - condensation turbines, where extraction steam is a by-product. Power plants for process heat generation or combined heat and power (CHP) stations generate electrical power, steam and district heat as their main products. Simultaneous heat and/or steam utilisation, along with power generation, is an effective method to diminish waste heat losses at the cold end of the turbine.
