Waste-to-energy plant

In its Environment Business Sector, in fact, Acea also manages the waste-to-energy process and is today the reference operator for central Italy with two waste-to-energy plants: one in San Vittore del Lazio and another in Terni.

In 2020, the energy produced by Acea through waste-to-energy reached 346 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 is approximately 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 2020, waste-to-energy at the Acea Ambiente plants produced 87,400 t of waste as compared with the 409,337 t waste processed through waste-to-energy, with a ratio of 21% of outgoing and incoming waste.