##### 



EXHIBIT 8.1


List of Subsidiaries


|                                        |  |                       |  |                                               |  |                                                           
|--------------------------------------- |  | --------------------- |  | --------------------------------------------- |  | ----------------------------------------------------------
|Company Name                            |  | Registered Office     |  | Activity                                      |  | Held by                                                   
|                                        |  |                       |  |                                               |  |                                                           
|Aburra BV                               |  | Amsterdam (Holland)   |  | Holding company                               |  | Pragma Energy SA                                          
|Agassiz Beach LLC                       |  | Minnesota  USA       |  | Electricity generation from renewable sources |  | CHI Minnesota Wind LLC                                    
|Agricola Rio Sahuil Ltda                |  | Santiago (Chile)      |  | Electricity generation from renewable sources |  | Agricola Y Constructora Rio Guanehue SA                   
|Agricola Y Constructora Rio Guanehue SA |  | Santiago (Chile)      |  | Electricity generation from renewable sources |  | Empresa Electrica Panguipulli SA Energia de Los Lagos Ltda
|Aquenergy Systems Inc.                  |  | South Carolina  USA  |  | Electricity generation from renewable sources |  | Consolidated Hydro Southeast Inc.                         
|Asotin Hydro Company Inc.               |  | Delaware  USA        |  | Electricity generation from renewable sources |  | Enel North America Inc.                                   
|Autumn Hills LLC                        |  | Minnesota  USA       |  | Electricity generation from renewable sources |  | CHI Minnesota Wind LLC                                    
|Avisio Energia S.p.A.                   |  | Trento (Italy)        |  | Gas distribution                              |  | Enel Distribuzione Gas S.p.A.                             
|Aziscohos Hydro Company Inc.            |  | Delaware  USA        |  | Electricity generation from renewable sources |  | Enel North America Inc.                                   
|Barras Electricas Galaico Asturianas SA |  | Lugo (Spain)          |  | Electricity distribution                      |  | Electra de Viesgo Distribucion SL                         
|Barras Electricas Generacion SL         |  | Lugo (Spain)          |  | Electricity generation                        |  | Barras Electricas Galaico Asturianas SA                   
|Beaver Falls Water Power Company        |  | Pennsylvania  USA    |  | Electricity generation from renewable sources |  | Beaver Valley Holdings Ltd.                               
|Beaver Valley Holdings Ltd              |  | Pennsylvania  USA    |  | Electricity generation from renewable sources |  | Hydro Development Group Inc.                              
|Beaver Valley Power Company             |  | Pennsylvania  USA    |  | Electricity generation from renewable sources |  | Hydro Development Group Inc.                              
|Boott Hydropower Inc.                   |  | Massachusetts  USA   |  | Electricity generation from renewable sources |  | Enel North America Inc.                                   
|Bypass Power Company                    |  | California  USA      |  | Electricity generation from renewable sources |  | CHI West Inc.                                             
|Canastota Wind Power LLC                |  | Delaware  USA        |  | Electricity generation from renewable sources |  | Essex Company                                             
|Carbones Colombianos del Cerrejon SA    |  | Bogotà (Colombia)     |  | Exploitation of coal mines                    |  | Pragma Energy SA Aburra BV                                
|C.A.R.T. Abruzzi S.r.l.                 |  | Orio al Serio (Italy) |  | Holding company for the water sector          |  | Enel Rete Gas S.p.A.                                      

14



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##### 



|                                     |  |                         |  |                                                    |  |                          
|------------------------------------ |  | ----------------------- |  | -------------------------------------------------- |  | -------------------------
|Company Name                         |  | Registered Office       |  | Activity                                           |  | Held by                  
|                                     |  |                         |  |                                                    |  |                          
|Central American Power Services Inc. |  | Delaware  USA          |  | Electricity generation from renewable sources      |  | Enel Latin America LLC   
|CHI Acquisitions Inc.                |  | Delaware  USA          |  | Electricity generation from renewable sources      |  | Enel North America Inc.  
|CHI Acquisitions II Inc.             |  | Delaware  USA          |  | Electricity generation from renewable sources      |  | CHI Finance Inc.         
|CHI Black River Inc.                 |  | Delaware  USA          |  | Electricity generation from renewable sources      |  | CHI Finance Inc.         
|CHI Canada Inc.                      |  | Québec  Canada         |  | Electricity generation from renewable sources      |  | CHI Finance Inc.         
|CHI Dexter Inc.                      |  | Delaware  USA          |  | Electricity generation from renewable sources      |  | CHI Finance Inc.         
|CHI Finance Inc.                     |  | Delaware  USA          |  | Electricity generation fromrenewable sources       |  | Enel North America Inc.  
|CHI Hydroelectric Company Inc.       |  | Newfoundland  Canada   |  | Electricity generation from renewable sources      |  | CHI Canada Inc.          
|CHI Highfalls Inc.                   |  | Delaware  USA          |  | Electricity generation from renewable sources      |  | CHI Finance Inc.         
|CHI Idaho Inc.                       |  | Delaware  USA          |  | Electricity generation from renewable sources      |  | CHI Acquisitions Inc.    
|CHI Magic Valley Inc.                |  | Delaware  USA          |  | Electricity generation from renewable sources      |  | CHI Acquisitions Inc.    
|CHI Minnesota Wind LLC               |  | Delaware  USA          |  | Electricity generation from renewable sources      |  | CHI Finance Inc.         
|CHI Mountain States Operations Inc.  |  | Delaware  USA          |  | Electricity generation from renewable sources      |  | CHI Acquisitions Inc.    
|CHI Operations Inc.                  |  | Delaware  USA          |  | Electricity generation from renewable sources      |  | Enel North America Inc.  
|CHI Power Inc.                       |  | Delaware  USA          |  | Electricity generation from renewable sources      |  | Enel North America Inc.  
|CHI Power Marketing Inc.             |  | Delaware  USA          |  | Electricity generation from renewable sources      |  | Enel North America Inc.  
|CHI Universal Inc.                   |  | Delaware  USA          |  | Electricity generation from renewable sources      |  | Enel North America Inc.  
|CHI West Inc.                        |  | Delaware  USA          |  | Electricity generation from renewable sources      |  | CHI Acquisitions Inc.    
|CHI Western Operations Inc.          |  | Delaware  USA          |  | Electricity generation from renewable sources      |  | CHI Acquisitions Inc.    
|Cise S.r.l.                          |  | Rome (Italy)            |  | Real estate management                             |  | Enel S.p.A.              
|Climare Scrl                         |  | Genoa (Italy)           |  | Energy services                                    |  | Enel Distribuzione S.p.A.
|Co.Im Gas S.p.A.                     |  | S.Maria a Colle (Italy) |  | Plant management, distribution and sale of gas     |  | Enel Rete Gas S.p.A.     
|Concert S.r.l.                       |  | Rome (Italy)            |  | Certification of products facilities and equipment |  | Enel Produzione S.p.A.   

15



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|                                                   |  |                            |  |                                               |  |                                                         
|-------------------------------------------------- |  | -------------------------- |  | --------------------------------------------- |  | --------------------------------------------------------
|Company Name                                       |  | Registered Office          |  | Activity                                      |  | Held by                                                 
|                                                   |  |                            |  |                                               |  |                                                         
|Coneross Power Corporation Inc.                    |  | South Carolina  USA       |  | Electricity generation from renewable sources |  | Aquenergy Systems Inc.                                  
|Conexion Energetica Centroamericana SA             |  | Guatemala                  |  | Electricity generation from renewable sources |  | Enel Latin America LLC Enel Green Power International SA
|Conexion Energetica Centroamericana El Salvador SA |  | San Salvador (El Salvador) |  | Electricity generation from renewable sources |  | Grupo EGI SA de cv Enel Latin America LLC               
|Consolidated Hydro Mountain States Inc.            |  | Delaware  USA             |  | Electricity generation from renewable sources |  | CHI Acquisitions Inc.                                   
|Consolidated Hydro New Hampshire Inc.              |  | Delaware  USA             |  | Electricity generation from renewable sources |  | CHI Universal Inc.                                      
|Consolidated Hydro New York Inc.                   |  | Delaware  USA             |  | Electricity generation from renewable sources |  | Enel North America Inc.                                 
|Consolidated Hydro Southeast Inc.                  |  | Delaware  USA             |  | Electricity generation from renewable sources |  | CHI Acquisitions II Inc.                                
|Consolidated Hydro Vermont Inc.                    |  | Delaware  USA             |  | Electricity generation from renewable sources |  | Enel North America Inc.                                 
|Consolidated Pumped Storage Inc.                   |  | Delaware  USA             |  | Electricity generation from renewable sources |  | Enel North America Inc.                                 
|Constructora Cerro Pitren Ltda                     |  | Santiago (Chile)           |  | Electricity generation from renewable sources |  | Agricola Y Constructora Rio Guanehue SA                 
|Crosby Drive Investments Inc.                      |  | Massachusetts  USA        |  | Electricity generation from renewable sources |  | Asotin Hydro Company Inc.                               
|Dalmazia Trieste S.r.l.                            |  | Rome (Italy)               |  | Real estate management                        |  | Cise S.r.l. Enel Ape S.r.l.                             
|Delta S.p.A.                                       |  | Milan (Italy)              |  | Telecommunications                            |  | WIND Telecomunicazioni S.p.A.                           
|Deval S.p.A.                                       |  | Aosta (Italy)              |  | Electricity distribution Valle DAostain      |  | Enel S.p.A.                                             
|Deval Energie S.r.l.                               |  | Aosta (Italy)              |  | Sale of electricity                           |  | Deval S.p.A.                                            
|EGI Costa Rica Viento SA                           |  | Santa Ana (Costa Rica)     |  | Electricity generation from renewable sources |  | Energia Global de Costa Rica SA                         
|EGI Holdco El Salvador SA de cv                    |  | San Salvador (El Salvador) |  | Electricity generation from renewable sources |  | Enel Green Power International SA Enel Latin America LLC
|Electra de Viesgo Distribuciòn SL                  |  | Santander (Spain)          |  | Distribution and sale of electricity          |  | Enel Distribuzione S.p.A.                               
|Electrica Banat SA                                 |  | Timisoara (Romania)        |  | Electricity distribution                      |  | Enel Distribuzione S.p.A.                               
|Electrica Dobrogea SA                              |  | Constanta (Romania)        |  | Electricity distribution                      |  | Enel Distribuzione S.p.A.                               

16



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|                                                    |  |                        |  |                                                                                                      |  |                                                  
|--------------------------------------------------- |  | ---------------------- |  | ---------------------------------------------------------------------------------------------------- |  | -------------------------------------------------
|Company Name                                        |  | Registered Office      |  | Activity                                                                                             |  | Held by                                          
|                                                    |  |                        |  |                                                                                                      |  |                                                  
|Electrificadora Ecologica SA                        |  | Santa Ana (Costa Rica) |  | Electricity generation from renewable sources                                                        |  | ZMZ General SA                                   
|Empresa Electrica Panguipulli SA                    |  | Santiago (Chile)       |  | Electricity generation from renewable sources                                                        |  | Energia de Los Lagos Ltda Energia Alerce Ltda    
|Empresa Electrica Puyehue SA                        |  | Santiago (Chile)       |  | Electricity generation from renewable sources                                                        |  | Energia de Los Lagos Ltda Energia Alerce Ltda    
|Enel Ape S.r.l. (previously Ape Gruppo Enel S.r.l.) |  | Rome (Italy)           |  | Personnel administration activities, real estate and facility
    management, information technology |  | Enel S.p.A.                                      
|Enel Capital S.r.l.                                 |  | Rome (Italy)           |  | Venture capital                                                                                      |  | Enel S.p.A.                                      
|Enel Comercializadora de Gas SA                     |  | Madrid (Spain)         |  | Sale of gas and electricity                                                                          |  | Enel Trade S.p.A.                                
|Enel Distribuzione S.p.A.                           |  | Rome (Italy)           |  | Electricity distribution                                                                             |  | Enel S.p.A.                                      
|Enel Energia S.p.A.                                 |  | Rome (Italy)           |  | Sale of electricity                                                                                  |  | Enel S.p.A.                                      
|Enel ESN Energo LLC                                 |  | Moscow (Russia)        |  | Management and maintenance of electricity generation plants                                          |  | Enel ESN Management BV                           
|Enel ESN Management BV                              |  | Amsterdam (Holland)    |  | Holding company                                                                                      |  | Enel Generation Holding BV                       
|Enel.Factor S.p.A.                                  |  | Rome (Italy)           |  | Factoring                                                                                            |  | Enel S.p.A.                                      
|Enel Finance International SA                       |  | Luxembourg             |  | Finance                                                                                              |  | Enel Produzione S.p.A.                           
|Enel Gas S.p.A.                                     |  | Milan (Italy)          |  | Sale of gas and electricity                                                                          |  | Enel S.p.A.                                      
|Enel Generation Holding BV                          |  | Amsterdam (Holland)    |  | Holding company                                                                                      |  | Enel Produzione S.p.A.                           
|Enel Green Power Hellas SA                          |  | Athens (Greece)        |  | Electricity generation from renewable sources                                                        |  | Enel Produzione S.p.A.                           
|Enel Green Power International SA                   |  | Luxembourg             |  | Holding of foreign companies operating in the electricity
    generation from renewable sources      |  | Enel Produzione S.p.A. Enel Investment Holding BV
|Enel Investment Holding BV                          |  | Amsterdam (Holland)    |  | Holding company                                                                                      |  | Enel S.p.A.                                      
|Enel Ireland Finance Ltd                            |  | Dublin (Ireland)       |  | Finance                                                                                              |  | Enel Finance International SA                    
|Enel Latin America LLC (previously EGI LLC)         |  | Delaware  USA         |  | Electricity generation from renewable sources                                                        |  | Enel Green Power International SA                
|Enel M@p S.p.A.                                     |  | Rome (Italy)           |  | Services                                                                                             |  | Enel Distribuzione S.p.A.                        
|Enel.Net S.r.l.                                     |  | Rome (Italy)           |  | Creation and management of telecommunication networks                                                |  | Wind Telecomunicazioni S.p.A.                    
|Enel.NewHydro S.r.l.                                |  | Rome (Italy)           |  | Ingegneria civile e meccanica, sistemi idrici                                                        |  | Enel S.p.A.                                      

17



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|                                                                            |  |                         |  |                                                      |  |                                                             
|--------------------------------------------------------------------------- |  | ----------------------- |  | ---------------------------------------------------- |  | ------------------------------------------------------------
|Company Name                                                                |  | Registered Office       |  | Activity                                             |  | Held by                                                     
|                                                                            |  |                         |  |                                                      |  |                                                             
|Enel North America Inc. (previously CHI Energy Inc.)                        |  | Connecticut  USA       |  | Electricity generation from renewable sources        |  | Enel Green Power International SA                           
|Enelpower S.p.A.                                                            |  | Milan (Italy)           |  | Engineering and contracting                          |  | Enel S.p.A.                                                 
|Enelpower Contractor and Development Saudi Arabia Ltd                       |  | Riyadh (Saudi Arabia)   |  | Power plant construction, management and maintenance |  | Enelpower S.p.A.                                            
|Enelpower do Brasil Ltda                                                    |  | Rio de Janeiro (Brasil) |  | Engineering and contracting                          |  | Enelpower S.p.A.                                            
|Enelpower UK Ltd                                                            |  | London (United Kingdom) |  | Engineering and contracting                          |  | Enelpower S.p.A.                                            
|Enel Produzione S.p.A.                                                      |  | Rome (Italy)            |  | Electricity generation                               |  | Enel S.p.A.                                                 
|Enel.Re Ltd                                                                 |  | Dublin (Ireland)        |  | Reinsurance                                          |  | Enel Investment Holding BV                                  
|Enel Rete Gas S.p.A. (previously Camuzzi Gazometri S.p.A.)                  |  | Milan (Italy)           |  | Natural gas distribution and sales; waste management |  | Enel Distribuzione Gas S.p.A.                               
|Enel Service UK Ltd                                                         |  | London (United Kingdom) |  | Services                                             |  | Enel Trade S.p.A.                                           
|Enel Servicii S.r.l.                                                        |  | Bucarest (Romania)      |  | Services                                             |  | Enel S.p.A. Enel Distribuzione S.p.A.                       
|Enel.si  Servizi integrati S.r.l.                                          |  | Rome (Italy)            |  | Engineering and energy related services              |  | Enel S.p.A.                                                 
|Enel Sole S.r.l. (previously Società luce elettrica S.p.A.
    Gruppo Enel) |  | Rome (Italy)            |  | Public lighting systems                              |  | Enel S.p.A.                                                 
|Enel Trade S.p.A.                                                           |  | Rome (Italy)            |  | Fuel trading and logistics  Sale of electricity     |  | Enel S.p.A.                                                 
|Enel Uniòn Fenosa Renovables SA                                             |  | Madrid (Spain)          |  | Electricity generation from renewable sources        |  | Enel Viesgo Renovables SL                                   
|Enel Viesgo Renovables SL                                                   |  | Santander (Spain)       |  | Holding company                                      |  | Viesgo Generacion SL                                        
|Enel Viesgo Servicios SL                                                    |  | Santander (Spain)       |  | Services                                             |  | Enel S.p.A. Enel Produzione S.p.A. Enel Distribuzione S.p.A.
|Energia Alerce Ltda                                                         |  | Santiago (Chile)        |  | Electricity generation from renewable sources        |  | Enel Latin America LLC Enel Green Power International SA    
|Energia de Los Lagos Ltda                                                   |  | Santiago (Chile)        |  | Electricity generation from renewable sources        |  | Energia Alerce Ltda Enel Latin America LLC                  
|Energias Especiales de Careon SA                                            |  | La Coruna (Spain)       |  | Electricity generation from renewable sources        |  | Enel Uniòn Fenosa Renovables SA                             

18



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|                                      |  |                            |  |                                               |  |                                                              
|------------------------------------- |  | -------------------------- |  | --------------------------------------------- |  | -------------------------------------------------------------
|Company Name                          |  | Registered Office          |  | Activity                                      |  | Held by                                                      
|                                      |  |                            |  |                                               |  |                                                              
|Energias Especiales de Castelo SA     |  | Madrid (Spain)             |  | Electricity generation from renewable sources |  | Enel Uniòn Fenosa Renovables SA                              
|Energias Especiales del Alto Ulla SA  |  | Madrid (Spain)             |  | Electricity generation from renewable sources |  | Enel Uniòn Fenosa Renovables SA                              
|Energias Especiales del Noroeste SA   |  | Madrid (Spain)             |  | Electricity generation from renewable sources |  | Enel Uniòn Fenosa Renovables SA                              
|Energias Especiales de Pena Armada SA |  | Madrid (Spain)             |  | Electricity generation from renewable sources |  | Enel Uniòn Fenosa Renovables SA                              
|Energia Global SA de cv               |  | Massachusetts  USA        |  | Electricity generation from renewable sources |  | Enel Latin America LLC                                       
|Energia Global de Costa Rica SA       |  | Santa Ana (Costa Rica)     |  | Electricity generation from renewable sources |  | Enel Latin America LLC                                       
|Energia Global Operaciones SA         |  | Santa Ana (Costa Rica)     |  | Electricity generation from renewable sources |  | Energia Global de Costa Rica SA                              
|Essex Company                         |  | Massachusetts  USA        |  | Electricity generation from renewable sources |  | Enel North America Inc.                                      
|Eufer Renovables Iberica 2004 SA      |  | Madrid (Spain)             |  | Electricity generation from renewable sources |  | Enel Uniòn Fenosa Renovables SA                              
|Florence Hills LLC                    |  | Minnesota  USA            |  | Electricity generation from renewable sources |  | CHI Minnesota Wind LLC                                       
|Fulcrum Inc.                          |  | Idaho  USA                |  | Electricity generation from renewable sources |  | Consolidated Hydro Mountain States Inc.                      
|Gauley Hydro LLC                      |  | Delaware  USA             |  | Electricity generation from renewable sources |  | Essex Company                                                
|Gauley River Management Corporation   |  | Vermont  USA              |  | Electricity generation from renewable sources |  | CHI Finance Inc.                                             
|Generadora de Occidente Ltda          |  | Guatemala                  |  | Electricity generation from renewable sources |  | Enel Latin America LLC Conexion Energetica Centroamericana SA
|Generadora Montecristo SA             |  | Guatemala                  |  | Electricity generation from renewable sources |  | Enel Latin America LLC Conexion Energetica Centroamericana SA
|Gestion Cogeneration Inc.             |  | Quebec  Canada            |  | Electricity generation from renewable sources |  | Hydrodev Inc.                                                
|Grupo EGI SA de cv                    |  | San Salvador (El Salvador) |  | Electricity generation from renewable sources |  | Enel Latin America LLC Enel Green Power International SA     
|Hadley Ridge LLC                      |  | Minnesota  USA            |  | Electricity generation from renewable sources |  | CHI Minnesota Wind LLC                                       
|Highfalls Hydro Company Inc.          |  | Delaware  USA             |  | Electricity generation from renewable sources |  | CHI Finance Inc.                                             

19



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|                                     |  |                     |  |                                               |  |                                            
|------------------------------------ |  | ------------------- |  | --------------------------------------------- |  | -------------------------------------------
|Company Name                         |  | Registered Office   |  | Activity                                      |  | Held by                                    
|                                     |  |                     |  |                                               |  |                                            
|Hope Creek LLC                       |  | Minnesota  USA     |  | Electricity generation from renewable sources |  | CHI Minnesota Wind LLC                     
|Hosiery Mill Hydro Company Inc.      |  | Delaware  USA      |  | Electricity generation from renewable sources |  | CHI Acquisitions Inc.                      
|Hydrodev Inc.                        |  | Québec  Canada     |  | Electricity generation from renewable sources |  | CHI Canada Inc.                            
|Hydro Development Group Inc.         |  | New York  USA      |  | Electricity generation from renewable sources |  | CHI Acquisitions II Inc.                   
|Hydro Energies Corporation           |  | Vermont  USA       |  | Electricity generation from renewable sources |  | CHI Finance Inc.                           
|Iridea S.r.l.                        |  | Milan (Italy)       |  | Consultancy services                          |  | Enel Gas S.p.A.                            
|Italgestioni S.r.l.                  |  | Bologna (Italy)     |  | Gas distribution                              |  | Enel Rete Gas S.p.A.                       
|Italgestioni Gas S.r.l.              |  | Bologna (Italy)     |  | Sale of gas                                   |  | Enel Gas S.p.A.                            
|Italia On Line S.r.l.                |  | Milan (Italy)       |  | Internet services                             |  | WIND S.p.A.                                
|IT-net S.r.l.                        |  | Rome (Italy)        |  | Network information systems                   |  | WIND S.p.A. Mondo WIND S.r.l.              
|Jack River LLC                       |  | Minnesota  USA     |  | Electricity generation from renewable sources |  | CHI Minnesota Wind LLC                     
|Jessica Mills LLC                    |  | Minnesota  USA     |  | Electricity generation from renewable sources |  | CHI Minnesota Wind LLC                     
|Julia Hills LLC                      |  | Minnesota  USA     |  | Electricity generation from renewable sources |  | CHI Minnesota Wind LLC                     
|Kings River Hydro Company Inc.       |  | Delaware  USA      |  | Electricity generation from renewable sources |  | CHI Finance Inc.                           
|Kinneytown Hydro Company Inc.        |  | Delaware  USA      |  | Electricity generation from renewable sources |  | Enel North America Inc.                    
|LaChute Hydro Company Inc.           |  | Delaware  USA      |  | Electricity generation from renewable sources |  | Enel North America Inc.                    
|Lawrence Hydroelectric Associates LP |  | Massachusetts  USA |  | Electricity generation from renewable sources |  | Essex Company Crosby Drive Investments Inc.
|Littleville Power Company Inc.       |  | Massachusetts  USA |  | Electricity generation from renewable sources |  | Hydro Development Group Inc.               
|Lower Saranac Corporation            |  | New York  USA      |  | Electricity generation from renewable sources |  | CHI Acquisitions Inc.                      
|Maritza East III Power Company AD    |  | Sofia (Bulgaria)    |  | Electricity generation                        |  | Maritza East III Power Holding BV          
|Maritza East III Power Holding BV    |  | Amsterdam (Holland) |  | Holding company                               |  | Enel Generation Holding BV                 
|Mascoma Hydro Corporation            |  | New Hampshire  USA |  | Electricity generation from renewable sources |  | CHI Acquisitions II Inc.                   

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|                                             |  |                         |  |                                                               |  |                                  
|-------------------------------------------- |  | ----------------------- |  | ------------------------------------------------------------- |  | ---------------------------------
|Company Name                                 |  | Registered Office       |  | Activity                                                      |  | Held by                          
|                                             |  |                         |  |                                                               |  |                                  
|Metan Gas Sicilia S.r.l.                     |  | Rome (Italy)            |  | Gas distribution                                              |  | Enel Rete Gas S.p.A.             
|Metro Wind LLC                               |  | Minnesota  USA         |  | Electricity generation from renewable sources                 |  | CHI Minnesota Wind LLC           
|Mill Shoals Hydro Company Inc.               |  | Delaware  USA          |  | Electricity generation from renewable sources                 |  | CHI Finance Inc.                 
|Minnewawa Hydro Company Inc.                 |  | Delaware  USA          |  | Electricity generation from renewable sources                 |  | Enel North America Inc.          
|Mobilmat S.p.A.                              |  | Milan (Italy)           |  | Finance                                                       |  | WIND S.p.A.                      
|Molinos de Viento del Arenal SA              |  | Santa Ana (Costa Rica)  |  | Electricity generation from renewable sources                 |  | Electrificadora Ecologica SA     
|Mondo WIND S.r.l.                            |  | Rome (Italy)            |  | Sale of telecommunication products and services               |  | WIND S.p.A. IT-net S.r.l.        
|Motherlode Hydro Inc.                        |  | California  USA        |  | Electricity generation from renewable sources                 |  | CHI West Inc.                    
|Newind Group Inc.                            |  | Newfoundland  Canada   |  | Electricity generation from renewable sources                 |  | CHI Canada Inc.                  
|North Canal Waterworks                       |  | Massachusetts  USA     |  | Electricity generation from renewable sources                 |  | Essex Company                    
|Northwest Hydro Inc.                         |  | Delaware  USA          |  | Electricity generation from renewable sources                 |  | CHI West Inc.                    
|Notch Butte Hydro Company Inc.               |  | Delaware  USA          |  | Electricity generation from renewable sources                 |  | CHI Finance Inc.                 
|Novatrans Energia SA                         |  | Rio De Janeiro (Brazil) |  | Creation and maintenance of electricity transmission networks |  | Terna S.p.A.                     
|Olympe Inc.                                  |  | California  USA        |  | Electricity generation from renewable sources                 |  | CHI West Inc.                    
|Operacion Y Mantenimiento Tierras Morenas SA |  | Santa Ana (Costa Rica)  |  | Electricity generation from renewable sources                 |  | Electrificadora Ecologica SA     
|Optigaz Inc.                                 |  | Québec  Canada         |  | Electricity generation from renewable sources                 |  | CHI Canada Inc.                  
|Ottauquechee Hydro Company Inc.              |  | Delaware  USA          |  | Electricity generation from renewable sources                 |  | CHI Finance Inc.                 
|Ottogas Rete S.r.l.                          |  | Milan (Italy)           |  | Gas distribution                                              |  | Enel Rete Gas S.p.A.             
|Ottogas Vendita S.r.l.                       |  | Milan (Italy)           |  | Sale of gas                                                   |  | Enel Gas S.p.A.                  
|Parque Eolico de Coucepenido SA              |  | La Coruna (Spain)       |  | Electricity generation from renewable sources                 |  | Enel Uniòn Fenosa Renovables SA  
|Parque Eolico de Os Corvos SA                |  | La Coruna (Spain)       |  | Electricity generation from renewable sources                 |  | Enel Uniòn Fenosa Renovables SA  
|Pelzer Hydro Company Inc.                    |  | Delaware  USA          |  | Electricity generation from renewable sources                 |  | Consolidated Hydro Southeast Inc.

21



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|                                                                    |  |                         |  |                                               |  |                                        
|------------------------------------------------------------------- |  | ----------------------- |  | --------------------------------------------- |  | ---------------------------------------
|Company Name                                                        |  | Registered Office       |  | Activity                                      |  | Held by                                
|                                                                    |  |                         |  |                                               |  |                                        
|P.H. Don Pedro SA                                                   |  | Santa Ana (Costa Rica)  |  | Electricity generation from renewable sources |  | Energia Global de Costa Rica SA        
|P.H. Guacimo SA                                                     |  | Santa Ana (Costa Rica)  |  | Electricity generation from renewable sources |  | EGI LLC Energia Global de Costa Rica SA
|P.H. Rio Volcan SA                                                  |  | Santa Ana (Costa Rica)  |  | Electricity generation from renewable sources |  | Energia Global de Costa Rica SA        
|Pragma Energy SA                                                    |  | Lugano (Switzerland)    |  | Coal trading                                  |  | Enel Investment Holding BV             
|Pragma Energy Services Ltd                                          |  | London (United Kingdom) |  | Administrative services                       |  | Pragma Energy SA                       
|Reti Gas S.c.r.l.                                                   |  | Bologna (Italy)         |  | Network construction in the gas sector        |  | Italgestioni S.r.l.                    
|Ruthton Ridge LLC                                                   |  | Minnesota  USA         |  | Electricity generation from renewable sources |  | CHI Minnesota Wind LLC                 
|S.A.M.I.G. S.r.l.                                                   |  | LAquila (Italy)        |  | Services                                      |  | Enel Rete Gas S.p.A.                   
|Sfera  Società per la formazione e le risorse
    aziendali S.r.l. |  | Rome (Italy)            |  | Human resources                               |  | Enel S.p.A.                            
|Sheldon Vermont Hydro Company Inc.                                  |  | Delaware  USA          |  | Electricity generation from renewable sources |  | CHI Acquisitions Inc.                  
|Sistemas Energeticos Manon Ortigueira SA                            |  | Ortigueira (Spain)      |  | Electricity generation from renewable sources |  | Enel Union Fenosa Renovables SA        
|Slate Creek Hydro Company Inc.                                      |  | Delaware  USA          |  | Electricity generation renewable sources      |  | CHI Acquisitions II Inc.               
|So.l.e. Milano H Scrl                                               |  | Rome (Italy)            |  | Construction of public lighting systems       |  | Enel Sole S.r.l.                       
|Soliloquoy Ridge LLC                                                |  | Minnesota  USA         |  | Electricity generation from renewable sources |  | CHI Minnesota Wind LLC                 
|Somersworth Hydro Company Inc.                                      |  | Delaware  USA          |  | Electricity generation from renewable sources |  | CHI Universal Inc.                     
|Southwest Transmission LLC                                          |  | Minnesota  USA         |  | Electricity generation from renewable sources |  | CHI Minnesota Wind LLC                 
|Spartan Hills LLC                                                   |  | Minnesota  USA         |  | Electricity generation from renewable sources |  | CHI Minnesota Wind LLC                 
|Summit Energy Storage Inc.                                          |  | Delaware  USA          |  | Electricity generation from renewable sources |  | Enel North America Inc.                
|Sun River LLC                                                       |  | Minnesota  USA         |  | Electricity generation from renewable sources |  | CHI Minnesota Wind LLC                 
|Sweetwater Hydroelectric Inc.                                       |  | New Hampshire  USA     |  | Electricity generation from renewable sources |  | CHI Acquisitions II Inc.               
|Tecnoguat SA                                                        |  | Guatemala               |  | Electricity generation from renewable sources |  | Enel Latin America LLC                 
|Tellas Telecommunications SA                                        |  | Athens (Greece)         |  | Telecommunications                            |  | WIND-PPC Holding NV                    

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##### 



|                                                               |  |                         |  |                                                                   |  |                                       
|-------------------------------------------------------------- |  | ----------------------- |  | ----------------------------------------------------------------- |  | --------------------------------------
|Company Name                                                   |  | Registered Office       |  | Activity                                                          |  | Held by                               
|                                                               |  |                         |  |                                                                   |  |                                       
|T.E.R.NA.  Trasmissione Elettricità Rete
    Nazionale S.p.A. |  | Rome (Italy)            |  | Ownership and maintenance of the electricity transmission network |  | Enel S.p.A.                           
|The Great Dam Corporation                                      |  | Massachusetts  USA     |  | Electricity generation from renewable sources                     |  | Lawrence Hydroelectric Associates LP  
|TKO Power Inc.                                                 |  | California  USA        |  | Electricity generation from renewable sources                     |  | CHI West Inc.                         
|Tsar Nicholas LLC                                              |  | Minnesota  USA         |  | Electricity generation from renewable sources                     |  | CHI Minnesota Wind LLC                
|T.S.N.  Transmissora Sudeste Nordeste SA                      |  | Rio De Janeiro (Brazil) |  | Construction, ownership and maintenance of transmission network   |  | Terna S.p.A.                          
|Twin Falls Hydro Company Inc.                                  |  | Delaware  USA          |  | Electricity generation from renewable sources                     |  | CHI Acquisitions Inc.                 
|Twin Lake Hills LLC                                            |  | Minnesota  USA         |  | Electricity generation from renewable sources                     |  | CHI Minnesota Wind LLC                
|Twin Saranac Holdings LLC                                      |  | Delaware  USA          |  | Electricity generation from renewable sources                     |  | Enel North America Inc.               
|Viesgo Energia SL                                              |  | Santander (Spain)       |  | Sale of electricity and natural gas                               |  | Electra de Viesgo Distribucion SL     
|Viesgo Generaciòn SL                                           |  | Santander (Spain)       |  | Generation and sale of electricity                                |  | Enel Produzione S.p.A.                
|Water & Industrial Services Company S.p.A.                     |  | Rome (Italy)            |  | Water depuration                                                  |  | Enel. NewHydro S.r.l.                 
|WEBiz Holding BV                                               |  | Amsterdam (Holland)     |  | Venture capital                                                   |  | Enel Investment Holding BV            
|Western New York Wind Corporation                              |  | New York  USA          |  | Electricity generation from renewable sources                     |  | Enel North America Inc.               
|Willimantic Power Corporation                                  |  | Connecticut  USA       |  | Electricity generation from renewable sources                     |  | CHI Acquisitions Inc.                 
|WIND-PPC Holding NV                                            |  | Amsterdam (Holland)     |  | Holding company in the Telecommunications sector                  |  | WIND S.p.A.                           
|WIND Telecomunicazioni S.p.A.                                  |  | Rome (Italy)            |  | Telecommunications                                                |  | Enel S.p.A. Enel Investment Holding BV
|Winters Spawn LLC                                             |  | Minnesota  USA         |  | Electricity generation from renewable sources                     |  | CHI Minnesota Wind LLC                
|ZMZ General SA                                                 |  | Santa Ana (Costa Rica)  |  | Electricity generation from renewable sources                     |  | EGI Costa Rica Viento SA              

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