The combination of gas turbines with a steam process is a proved method of increasing efficiency with favorable specific capital investment. A new variant in this field is the so-called interconnector. This involves a gas and steam process, in which steam is produced with the gas turbine waste gas heat and is then fed into the steam turbine of a conventionally fired steam power plant unit. At the present time, a 400 MW power plant is under construction and a 750 MW power plant is being designed in accordance with this concept.