One of the effective measures in this way is the construction of combined cycle power plants consisting of gas and steam units. Due to the relatively low efficiency of gas power plants by about 35%, in order to achieve the above goal by adding the steam section, the efficiency of the power plant will increase to about 50%. A gas power plant is a power plant that uses air as the operating fluid and natural gas (or diesel and other fossil fuels) as the fuel for combustion. The low efficiency of these power plants is due to the release of most of the energy produced by combustion into the environment. Exhaust gases have a temperature of about 540 degrees.

Advantages of gas turbine:

• Gas units are installed very quickly due to their small size and simplicity.
• After starting, the gas units usually reach the efficiency stage in less than ten minutes.
• The cost of installing gas units is low.
• Due to the simplicity of the building and the lack of auxiliary parts, it is easy to operate.
• In gas turbines, the ability to use different fuels and change the type of fuel the unit is operating during efficiency gives the unit good maneuverability.
• Environmental pollution is lower than other thermal power plants with similar power.

Disadvantages of gas turbines:

• The efficiency of gas units is low due to the release of large amounts of energy in the form of heat from the exhaust.
• Because gas units usually use natural gas or light fuels, their current costs are high due to the high cost of such fuels.

The main components of a combined cycle power plant are:

Gas section, steam section, cooling system