The Sustainability Report The Sustainability Report, which in 2011 reached its fourteenth edition, is the main reporting instrument adopted by the Acea Group so as to present the results of company operations and the growth prospects from a sustainability standpoint. The description and quantification of the non-financial data, the intangible assets and the social and environmental performance indicators represent the nerve centre of the document which intends to supplement and complete the overview of the economic-financial information. The 2011 edition of the document was published at the same time as the annual financial statements. The Sustainability Report, drawn up in compliance with the GRI G3.1 Guidelines ( 2011 edition) and subject to external audit by a specialised company, can be consulted in PDF format and via the on-line version on a dedicated website. PDF Sustainaibility Report 2011 Sustainaibility Report 2010 Sustainaibility Report 2009 Sustainaibility Report 2008 Sustainaibility Report 2007 Sustainaibility Report 2006 Sustainaibility Report 2005 Sustainaibility Report 2004 Sustainaibility Report 2003 ON LINE VERSION Sustainaibility Report online 2011 Sustainaibility Report online 2010 Sustainaibility Report online 2009 http://www.acea.it/section.aspx/en/sustainability_report?lang=en