Waste-to-energy plant

Acea’s Environment Business Sector also manages the waste-to-energy process and is nowadays a reference operator in central Italy with two plants - located respectively in San Vittore del Lazio and Terni. - that generate energy from waste.

In 2022, the energy produced by Acea through waste-to-energy processes was equal to 337 GWh.

Waste-to-energy is the process through which electricity is generated from waste combustion. How does the process take place? This is a summary of the main steps.

  1. Waste entering the plant is conveyed into the combustion furnaces.

  2. Combustion takes place with a water- and air-cooled mobile grille.

  3. The heat generated by combustion is recovered for steam production.

  4. The steam expands to activate a turbine that produces electricity to be injected into the grid.


A process that aims to be increasingly efficient, also in environmental terms by reducing the impact of the activity.
During the combustion process, for example, the fumes produced are treated on several occasions in order to minimise the pollutant emissions. The share of green energy produced in the two Acea plants can vary between 40% and 50%.


Finally, in addition to energy production, the waste-to-energy plants can significantly reduce the volume of waste disposed of in a landfill.

In 2022, waste-to-energy processes at the Acea Ambiente plants produced a 76% reduction in waste that would otherwise be sent to landfills, with 387,346 tons entering and 93,820 tons leaving the plants.


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