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Avoided emissions and energy saving

Avoided emissions and energy saving

The method of calculating the avoided emissions of CO2 and energy saving applicable to all of the Group’s plants and energy processes located in Italy has been reviewed and revised and the new method applies to the 2010 figures onwards.
The method has been extended by adding a definition of the criteria used for processing the data in order to calculate the associated avoided emissions of CO2 per kWh distributed with district heating in a predetermined sphere - network, system of networks, entire Group company, entire A2A Group - that depends on the communication requirements. The emission factors and average specific consumption for national thermoelectric production taken as a reference in the calculations (Italian Greenhouse Gas Inventory - National Inventory Report 2011 - 545 gCO2/kWh - and the Terna data for 2009, the same reference year as the ISPRA report) have been updated.
The methodology represents an agreed means of quantifying and communicating these environmental benefits to stakeholders by providing homogeneous information even if it originates from distinct businesses within the Group.
The method forms part of Scope 3 of the GHG Protocol and has been created as a means of reporting the annual data of the plants in use and of making forecast analyses for planned plants. Further details may be found in the previous edition of the Sustainability Report.
The results of applying this method are set out in the following table.
  Avoided emissions (tCO2eq) Primary energy saved (toe)
  2011 2010 2011 2010
Cogeneration plants with district heating using fuel other than waste and possibly with a heat pump section 40,161 29,975 20,653 20,985
WTE 1,100,089 1,047,454 294,271 283,767
Electricity production from renewable sources 1,691,035 1,871,067 600,595 621,386
Non-cogeneration thermoelectric production 28,841 94,274 33,366 176,221
Total 2,860,126 3,042,770 948,885 1,102,359

The main contribution to the level of avoided emissions comes from production from renewable sources, mostly hydroelectric, which for A2A represent around 30% of the Group’s electricity production.
The figures show that waste to energy treatment plays an important part in contributing to greenhouse gas reduction objectives. It should be emphasised that A2A plants receive waste that cannot be recovered in other ways and for which, therefore, the alternative to this treatment is the landfill The lower emissions of CO2 equivalent are above all due to the non-dispersion of biogas by the respective landfill.