Iren is a holding company headquartered in Reggio Emilia. The Parent company is responsible for strategic, administrative, development, coordination and control activities. The four companies Iren Energia, Iren Mercato, IRETI and Iren Ambiente are responsible for activities by business sector.

IREN was created on 1 July 2010 from the merger of Enìa into Iride and is at the top of national multi-utility companies with a prominent position in the different business areas, a balanced mix of regulated and quasi-regulated activities and unregulated activities, and a strong integration between upstream and downstream activities.

Thanks to its production assets, the investments made and underway, its positioning in all business areas, in all stages of the energy chain, and its territorial roots, IREN is today one of the leading multi-utility Groups on the Italian scene.

Iren Energia, parent company of the "Energy" Business Unit, is the company of the Iren Group that produces, distributes and sells electricity, gas, products and services for public entities, companies and individuals.

Iren Mercato, parent company of the "Market" Business Unit, is the Iren Group company operating in the electricity, gas and district heating marketing sector.

• Salerno Energia Vendite
  
• Alegas
• ATENA Trading s.r.l.

Iren Ambiente, parent company of the "Environment" Business Unit, is the Iren Group company that, in the Piedmont and Emilia Romagna regions, carries out the coordination and management of urban sanitation, the integrated waste cycle and the renewable energy sector.

• Amiat Veicolo SpA 93,06% (detiene l'80% di Amiat SpA)
• Bonifica Autocisterne s.r.l.
• Iren Ambiente Parma s.r.l.
• Iren Ambiente Piacenza s.r.l.
• TRM S.p.A.
• ACAM Ambiente S.p.A.
• ReCos S.p.A.
• San Germano S.p.A.
• Territorio e Risorse s.r.l.
• Rigenera Materiali s.r.l.
• I.Blu S.p.A.
• Uniproject s.r.l.
• Manduriambiente S.p.A.
  
• Bonifiche Servizi Ambientali (BSA)
• Iren Ambiente Toscana S.p.A.
• Scarlino Energia S.p.A.
  
• Valdarno Ambiente
• TB S.p.A.
• CRCM S.r.l.
• Sei Toscana
• Ekovision
• Valdisieve
• Futura S.p.A.

IRETI, parent company of the "Networks" Business Unit, is the Iren Group company that manages the distribution of electricity, gas and water in an integrated and widespread manner throughout the country.