In electric power generation a combined cycle is an assembly of heat engines that work in tandem off the same source of heat, converting it into mechanical energy, which in turn usually drives electrical generators. The principle is that the exhaust of one heat engine is used as the heat source for another, thus extracting more useful energy from the heat, increasing the system's overall efficiency. This works because heat engines are only able to use a portion of the energy their fuel generates (usually less than 50%). In an ordinary (non combined cycle) heat engine the remaining heat (e.g., hot exhaust fumes) from combustion is generally wasted.

Many installation of gas turbines was not on their previous installation coupled with a exhaust gas recovery boiler. Today the energy cost permit to do a complementary installation in order to improve the installation efficiency and safe money. We are prepared to do the studies for evaluation cost of the complementary installation and time ammortization