The Sarlux IGCC Plant consists of two main units:

• the gasification and gas clean-up unit
• the combined cycle unit

The gasification unit, which consist of three single-shaft trains, converts the refinery TAR in synthesis gas (syngas), composed of hydrogen (H₂) and carbon mono-oxide (CO), using a partial oxidation reaction, which is non-catalytic and takes place at high temperature (about 1.400°C). The necessary oxygen is provided by the nearby air separation plant owned by Air Liquide Impianti Gassificazione. The syngas is stripped of hydrogen sulphide (H₂S), which is converted to pure elemental sulphur, releases part of the hydrogen to the refinery and eventually is burned in the gas turbines.
The syngas, before being sent to the CCU, is saturated with water to control the NOx emission.
The electric power is produced by the combined cycle unit, which is composed by three single-shaft trains, each one consisting of gas turbine, steam turbine and heat recovery steam generator.