Gas turbines are being installed in many of todays natural gas fueled power plants. One key to a turbine’s fuel-to-power efficiency is the temperature at which it operates. Higher temperatures generally mean higher efficiencies, which in turn, can lead to more economical operation. Gas flowing through a typical power plant turbine can be as hot as 2300 degrees. way to boost efficiency is to install a recuperator or heat recovery steam generator (HRSG) to recover energy from the turbine’s exhaust. A recuperator captures waste heat in the turbine exhaust system to preheat the compressor discharge air before it enters the combustion chamber. A HRSG generates steam by capturing heat from the turbine exhaust. These boilers are also known as heat recovery steam generators. High-pressure steam from these boilers can be used to generate additional electric power with steam turbines, a configuration called a combined cycle. This system can improve overall efficiency of your turbine system by over 25%

Reference: https://energy.gov/fe/how-gas-turbine-power-plants-work