ACEA    Azienda Comunale Energia e Ambiente (Municipal Energy and Environment Company)  
 AEEG    Autorità dell’Energia Elettrica e del Gas (Italian Authority for Electricity and Gas)  
 AGC    Autorità Garante della Concorrenza e del Mercato (Italian Antitrust Authority)  
 AIT    Average Interruptioni Time  
 ASA    Average System Availability  
 AU    Acquirente Unico (Italian Single Buyeri)  
 BoD    Board of Directors  
 CdP    Cassa Depositi e Prestiti  
 CEI    Comitato Elettrotecnico Italiano (Italian Electrotechnical Committee) 
 CESI    Centro Elettrotecnico Sperimentale Italiano (Italian Electrotechnical Testing Centre)  
 CIGRE    Conseil International des Grands Réseaux Electriques à Haute Tension  
 CONSOB    Commissione Nazionale per le Società e la Borsa (National Commission for Companies and the Stock Exchange) 
 CSR    Corporate Social Responsibility  
 DAEM    Day Ahead Energy Market  
 DP    Development Plan of the national transmission electricity grid  
 DPS    Dividend Per Share  
 DT    Distance Training  
 EBIT    Earnings Before Interest and Taxes  
 EIA    Environmental Impact Assessment  
 EMO    Energy Market Operator  
 EMS    Energy Management System  
 ENS    Energy Not Supplied  
 EPS    Earnings Per Share  
 EPSES    Emergency Plan for the Security of the Electricity System  
 ERA    Exclusion, Repulsion, Attraction  
 ETSO    European Transmissioni System Operators  
 GAAP    Generally Accepted Accounting Principles  
 GIS    Geographic Information System  
 GRI    Global Reporting Initiative  
 GRTN    Gestore della Rete di Trasmissione Nazionale (National Transmission Grid Operator)  
 GSE    Gestore Servizi Elettrici (Electric Services Management)  
 HV    High Voltage 
 IEA    International Energy Agency  
 IPD    Individual Protection Device  
 IPO    Initial Public Offering  
 ISPRA    Istituto Superiore per la Protezione e la Ricerca Ambientale  
 ISTAT    Italian National Statistics Institute  
 MBI    Maintenance and Business Intelligence  
 MBO    Management By Objectives  
 MDS    Market for Dispatchingi Services  
 MED    Ministry of Economic Development  
 MEF    Ministry of Economy and Finance  
 MELC    Ministry for the Environment and Land Conservation  
 MPA    Ministry for Productive Activities (now the Ministry for Economic Development MED)  
 N.A.    Not Available  
 NCC    National Control Centre  
 NTG    National Transmission Grid  
 OECD    Organisation for Economic Cooperation and Development  
 PCB    Polychlorinated biphenyls  
 PCT    Polychlorinated terphenyls  
 ROACE    Returns on Average Capital Employed  
 S&P    Standard & Poor’s  
 SCADA    Supervisory Control And Data Acquisition  
 SEA    Strategic Environmental Assessment  
 SETSO    South European Transmission System Operators  
 SISTAN    National Statistical System  
 SRI    Socially Responsible Investment  
 TFR    Trattamento di Fine Rapporto (Staff Severance Indemnity)  
 TOA    Transmission Operational Area  
 TSO    Transmission System Operator  
 TSR    Total Shareholder Return  
 UCTE    Union for the Coordination of Transmission of Electricity  
 VHV    Very High Voltage  
 ZPS    Special Protection Area