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Hydroelectric power plants harness the potential gravitational energy of a large mass of water to transform it into kinetic energy and, through turbines and alternators, into electrical energy.

Energy from

renewable sources reduces

environmental impact 

The Iren Group’s hydroelectric plants are located in Turin and in Piedmont in the Orco and Susa Valleys. In Campania, however, there is the Tusciano core.

Specifically, these are reservoir plants, which use water from a natural or artificial reservoir, and run-of-river plants, which use the flow of a watercourse, with a total installed capacity of around 604 MW.

Orco Valley

Susa Valley

Turin

Tusciano

Orco Valley

Agnel - Serrù - Villa plant

The plant uses water stored in the two seasonally regulated reservoirs of Agnel and Serrù (700 m drop). The Agnel and Serrù reservoirs, located at 2,296 and 2,275.5 m a.s.l., respectively, hold 2.14 and 14.49 million m³ of water. In the Villa power plant, a generating unit with a capacity of 40 MW and a production capacity of about 80 GWh/year is installed.

Ceresole - Rosone plant

The run-of-river plant uses water stored in the seasonally regulated Ceresole reservoir, located at 1,572 m a.s.l. and characterised by a reservoir of 34 million m³ (813 m drop). Two generating units are installed at the Rosone power plant, each with a capacity of 49.3 MW and a production capacity of about 250 GWh/year. 

Rosone - Bardonetto plant

The run-of-river plant, with an hourly regulated loading tank with a capacity of 10,000 m³, uses water from the Orco stream and water returned from the Rosone power plant (127 m drop). Two generating units with a capacity of 9.0 MW each and a production capacity of about 70 GWh/year are installed at the Bardonetto power plant.

Bardonetto ‐ Pont plant

The run-of-river plant, with an hourly regulated loading tank with a capacity of 8,000 m³, uses water from the Orco stream and water returned from the Bardonetto power plant (111 m drop). Two generating units with a capacity of 7.3 MW each and a production capacity of about 70 GWh/year are installed at the Pont power plant.

Valsoera ‐ Telessio plant

The pumped storage plant with seasonally regulated reservoirs (555 m drop) uses water from the Piantonetto, Valsoera and Balma streams, stored in the Valsoera reservoir located at 2,412 m a.s.l. and characterised by a reservoir of 7.7 million m³ of water. In the (cavernous) power plant of Telessio, a generation and pumping unit is installed with a capacity of 38 MW in generation and 34 MW in pumping and a production capacity of approximately 40 GWh/year (of which 13 GWh/year from natural outflows and the remainder from pumping). Downstream of the power plant, water is returned to the Telessio reservoir, thanks to which, at night, water can be pumped back into the Valsoera reservoir, so that it can be used for the production of valuable energy during the day, when demand is greatest.

Telessio ‐ Eugio ‐ Rosone plant

The plant with seasonally regulated reservoirs (1,217 m drop), uses water from the Piantonetto and Eugio streams, stored in the two reservoirs of Telessio and Eugio located at 1,917 and 1,900 m a.s.l., respectively, with reservoirs of 23 and 4.95 million m³. Two generating units are installed at the Rosone power plant, each with a capacity of 41.2 MW and a production capacity of about 200 GWh/year.

San Lorenzo - Rosone plant 

The run-of-river plant uses water from the Piantonetto stream (254 m drop). The Rosone power plant has a generation unit installed with a capacity of 4.3 MW and a production capacity of about 8 GWh/year.

Susa Valley

Pont Ventoux ‐ Susa plant

The plant utilises the water of the Dora Riparia and partially that of its left tributary Clarea, which is conveyed via a shunt canal to the Clarea reservoir (515 m drop). In the (cavernous) power plant in Venaus, there are two production units with a capacity of 78.5 MW each (one binary turbine-alternator and one ternary turbine-alternator-pump) and a production capacity of about 350 GWh/year. Downstream of the power plant, the water is returned to the Susa Gorge reservoir (0.44 million m³), thanks to which, at night, the water can be pumped back into the Clarea reservoir (0.56 million m³), so that it can be used for the production of valuable energy during the day, when demand is greatest.

Salbertrand - Chiomonte plant

The run-of-river plant uses water from the Dora Riparia and the three minor streams Pontetto, Galambra and Clarea (326 m drop). Three generating units with a capacity of 4.5, 4.5 and 6.0 MW are installed at the Chiomonte power plant.

Chiomonte - Susa plant

Valle Dora Energia S.r.l., a subsidiary of the Municipalities of Chiomonte, Salbertrand, Exilles and Susa and an investee of Iren Energia (49%), was established to develop the redevelopment projects for the hydroelectric plants at Chiomonte and Susa which, in 2016, were admitted to the rankings by the GSE (Gestore dei Servizi Energetici - Electricity Services Provider) for incentives on the energy produced.

 

Keeping these plants in operation also ensures important functions of public utility for the local area (protecting irrigation easements, hydro-geological protection and fire prevention service). The total output of the plants is 16.8 MWe (7.6 MWe for the Susa plant and 9.2 MWe for the Chiomonte plant). In 2021, following a period of redevelopment, the two facilities operated at full capacity.

Turin

La Loggia - Moncalieri plant

The run-of-river plant uses water from the Po River derived in the municipality of La Loggia (flow rate of 70 m³/s and 6.0 m drop). The Moncalieri power plant has a generation unit installed with a capacity of 3.2 MW and a production capacity of about 20 GWh/year.

Po Stura ‐ San Mauro plant

The run-of-river plant uses water from the Po River derived immediately downstream of the confluence of the Stura stream (flow rate of 120 m³/s and 8.0 m drop). The San Mauro power plant has a generation unit with a capacity of 8.0 MW and a production capacity of about 40 GWh/year.

Tusciano

There are seven plants that make up the Tusciano core. Distributed in the Salerno and Avellino provinces, these plants have a total installed capacity of more than 100 MW, with a production capacity of around 250 GWh per year.

 

EMAS environmental registration

 

The Tusciano hydroelectric plants have an environmental management system in accordance with the EMAS Regulation, with the aim of implementing continuous improvement in environmental performance and publishing an environmental declaration. EMAS registration, according to Regulation (EC) no. 1221/2009, is one of the most sought-after and selective achievements in the environmental management of a production site. The plants, which already have a UNI EN ISO 14001:2004 certified environmental management system, obtained EMAS registration number IT-000618 and validation of the Environmental Declaration.

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  • Dichiarazione ambientale 2005

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  • Dichiarazione ambientale 2003