Emissions into the atmosphere

Emissions into the atmosphere from thermoelectric plants and waste-to-energy plants are monitored, if possible on an on- going basis, via specific analysers subject to periodic checks, by in-house staff and qualified external laboratories.
All the production plants operate in observance of formalised Environmental management systems and commit themselves to both cutting down the emissions of micro-pollutants (CO, NOx and SO2) and containing emissions of carbon dioxide (CO2).
The carbon footprint of the electricity generation process using thermoelectric energy source fell considerably in 2011 in absolute terms - from around 123,000 tons of CO2 in 2010 to roughly 35,000 tons (see table No. 88) - even if this is essentially due to a proportionate reduction in production volumes. At the same time, the specific emission indicator rose, measured by the quantity of CO2 emitted per electricity unit produced, passing from around 500 g/kWh in 2010 to 1,300 g/kWh in 2011. The main cause of the deterioration was the rise in the percentage of the portion of energy produced in the Montemartini plant, which since it is fuelled by gas oil, produces higher specific emissions naturally.
The two Acea thermo-generation plants of Tor di Valle and Montemartini are subject to the Emission Trading Scheme, therefore they must deal with the restriction of not emitting quantities of CO2 greater than the quota assigned to them by the National Allocation Plan, at the risk of a deterioration in the profile of the costs due to the need to buy quotas in excess on the market (see table No. 87).


(t)  CO2 emissions (t)  
plants 2009 2010 2011
by NAP
effective assigned
by NAP
effective assigned
by NAP
Tor di Valle 235,788 105,737 235,788 87,989 235,788 26,089
Montemartini 3,653 3,095 1,827 2,902 1,218 4,762

With regard to emissions of CO, SOand NOx, micropollutants, the same comments made in relation to emissions of CO2 are valid: in fact, a sharp decrease was seen in absolute values, while in specific terms an evident rise was observed

In conclusion, the monitoring carried out on all the plants at risk demonstrated the absence of appreciable quantities of emissions of substances responsible for reducing the ozone layer.
Table No. 88 shows the total emissions of the Group, including those from vehicles and air-conditioning. 
It should be emphasised, in conclusion, that the contribution to emissions from the waste-to-energy plant, particularly contained in 2011, should be placed in relation to the revamping and overhaul activities underway which led to the total shutdown of the Terni plant and just a few months of activities for the San Vittore plant.

Table No. 88 - TOTAL ACEA GROUP EMISSIONS (2009-2011)

CO2 180,590 122,940 35,308
CO 68.880 67.340 33.340
NOx 308.820 226.270 91.870
SO2 9.920 6.700 0.690

Group vehicle fleet

From some year now, the Group has been committed to renewing the corporate vehicle fleet and reveals evident reductions in the consumption of fuel and the consequent emissions into the atmosphere. 
The vehicle fleet amounted to around 2,300 vehicles, with a progressive lowering of the average age due to the introduction of latest generation vehicles. Specifically, during 2011, besides the Euro 4 vehicles, a number of Euro 5 vehicles were purchased, to replace the “older” ones and Acea equipped itself with 40 electric vehicles which supplement the traditional fleet.


116  Also see the Environmental accounts, section Vehicle and heating emissions page XVII.