Boundary and indicators

Except as stated otherwise, the data and information in the 2011 Sustainability Report regard the boundary including Terna S.p.A. and the companies that were consolidated in the Consolidated Financial Statements as of December 31, 2011. In compliance with the GRI Boundary Protocol, the data in the Sustainability Report refers to all the companies that have a significant impact on sustainability (for example, according to their size or number of employees; their potential impact on the environment or the community, or number of activities/actions carried out during the year) on which Terna S.p.A. exercises, directly or indirectly, control, i.e. the companies in which Terna can determine financial and operating policies. There are no relations with joint ventures, subsidiaries, or leased businesses that could significantly influence the boundary or comparability of the data.

Data was calculated in an accurate way on the basis of the findings of the general accounting and of Terna’s other information systems; in the case of estimates in determining the indicators, the modality followed was specified.

All the GRI indicators published are listed below in the GRI Content Index, which also shows any limitations compared to the requirements of the Reporting Guidelines. The list also includes core indicators, necessary for applying the Guidelines at the A level, that do not apply to Terna.

Compared to the 2010 Report, the following is pointed out:

  • the changed 2009 and 2010 data in the EN 4, EN 16 and LA 7 indicators. This change depends on the following reasons:
    • for energy consumption of stations and the corresponding indirect CO2 emissions, the precise figures registered for the first time in 2011 highlighted an over-estimate of consumption for the previous years that in line with the new measures, were reviewed and lowered;
    • for CO2 emissions, it was decided to refer to emission factors present in the Fourth Assessment Report issued by the IPCC (Intergovernmental Panel Climate Change). Consequently, the tons of CO2 relative to the SF6 insulating gas and to the R22 refrigerant gas are changed compared to the previous publications;
    • for the injury rate and for the absentee rate, in 2011, processing criteria were reviewed as well as the items that determine the total of hours worked. To guarantee data consistency and comparability, the figures of hours worked used for determining rates were updated and reviewed also for the previous years;
  • the changed prospect of value added, with reference to some economic comparative balances for 2010 and 2009 to take into account the change in the accounting method adopted by the Terna Group for goodwill taxation.