Emissions into the Atmosphere

Acea monitors emissions from its thermoelectric plants – continuously if possible – through specific analyzers subject to regular controls by both in-house staff and external qualified laboratories.
The main AceaElectrabel Produzione and Tirreno Power production plants have environmental Certification and are committed to reducing micro-pollutants (CO, NOx and SO2) and limiting carbon dioxide emissions (CO2). In 2009, AceaElectrabel Produzione achieved specific CO2 emission of 388 g/kWh and low
nitrogen oxide emissions
due to the dry-low-NOx devices in the burners of the latest combine cycle generation plants, which managed to keep such emissions as low as is currently possible. Although Tirreno Power Plants use modern technologies, they also use a combination of fuels (including coal and fuel oil) which cause more emissions than natural gas. Tirreno Power specific CO2 emissions in 2009 therefore
amounted to 527 g/kWh. The company is however committed to progressively limiting emissions into the atmosphere; a current programme to manage fume treatment systems in the coal section at Vado Ligure thermoelectric plant (Savona) has not only confirmed compliance with the established emission limits, but
also ensured improvement in environmental performances and, more precisely, a reduction in concentrations of smoke-stack emissions with respect to legal limits of 2.5% for SO2, 2.5% for NOx and 30% for dust127

Table 88 – OVERALL EMISSIONS (2007-2009)

of measurement
 2007  2008  2009 
CO2 t  483,212 1,686,384 1,422,402
CO t  78.5 376.6 352.2
NOx t  296.1 948.8 758.0
SO2 t  0.1 768.9 623.0

NB:figures for the three-year period in question have been reclassified according to Acea shareholdings (100% A.R.I.A. Group, 100% Acea Reti e Servizi Eneregetici, 15% Tirreno Power, 30% AceaElectrabel Produzione). Tirreno Power was not included in the Group scope of consolidation in 2007.

The CO2 emissions assigned to the National Allocation Plan (NAP) for the Group for 2008-2009 and those effectively emitted are illustrated in Table 89. These values refer to overall volumes to attribute to each Station, while the emissions for Acea – recalculated according to shareholdings – are provided in Environmental Accounts in the attached CD.

127The limits established by the MICA Decree in 1993 and Legislative Decree 152/06 (Annex 2, part 5), are 400 mg/Nm3 for SO2, 200 mg/Nm3 for NOx and 50 mg/Nm3 for dust, while the programmes to improve environmental performance in Tirreno Power have led to concentrations in the Vado Ligure Station of 390 mg/Nm3 for SO2, 195 mg/Nm3 for NOx and 35 mg/Nm3 for dust.mino della centrale di Vado Ligure a 390 mg/Nm3 per SO2, 195 mg/Nm3 per NOx e 35 mg/Nm3 per le polveri.


 shares assigned by NAP (tons)
effective emissions (in tonnellate)shares assigned by NAP (tons)
effective emissions (tons)
Tirreno Power Plants
(partecipata da Acea al 15%)
Naples Plant
13,202 (*)25,156,53339,665 (**)471,979.20
Vado Ligure
AceaElectrabel Produzione Plants
(Acea shareholding 30%)
Tor di Valle235,788153,552235,788105,737
Terni EnA Plants (Acea shareholding 100%):    
Terni EnA (***)8,055125,8698,05565,642

(*) Shares assigned for roll-out of the combined cycle at Napoli Levante.(Decsion 013/2009).
(**) Shares assigned for roll-out (1/01/2009 – 27/04/2009) and operations (28/04/2009 – 31/12/2009) (Decision 09/2010).
(***) Share assigned for the section attributed by CIP 6/92, ending in 2010

All the plants at risk were monitored, demonstrating that no substantial emissions of substances responsible for reducing the ozone layer were made. Finally, sound levels were monitored at the thermoelectric and hydroelectric stations and acoustic levels were measured at the Montemartini Plant further to installation of a soundproofing structure at the outlet of one of the gas turbines.