(“AAthe nature and extent of the organization’s adherence to AA1000APS – 2008 principles, but also the evaluation of the reliability of data and information on sustainability performance, reported by the Group in accordance with the “Sustainability Reporting Guidelines”, version 3.1, issued in 2011 by Global Reporting Initiative (“G.R.I.”) and with the sector supplement “Sustainability Reporting Guidelines & Electric Utilities Sector Supplement” issued in 2009 by G.R.I..