When gas is compressed, the temperature and pressure rise. In a turbine, such as the one at our coal-fired power plant in Duisburg Walsum, this process is reversed. The steam expands as it flows through the turbine and the pressure and
temperature drop. Due to the expansion, the energy is transferred to the blades of the turbine. The higher the temperature, the greater the efficiency, i.e. the more economical a power plant is.