In the middle of the 1990’s, very efficient (over 38%) gas turbines with high power output entered the market. Their exhaust gases had a high temperature and could be used to produce steam in a subsequent vaporizer.
Simultaneously, natural gas prices were continuously dropping since the beginning of the 1990’s and had moved close to hard coal prices. Finally, for economical and competitive reasons, big gas turbine manufacturers offered attractive prices.
As a result, it became possible to construct so-called steam-and-gas or combined cycle(CC) power stations with high ratings at low investment costs and operate them with low power generation costs.