Supporting Greater Integration of Renewable Energy & Cross Border Trade in the Mediterranean Region

About TuNur Italy

TuNur Italy is a 2,000MW transmission line purposefully built to deliver low-cost baseload solar power from TuNur’s hybrid solar facility in Southern Tunisia, to the heart of the European network from 2032.

TuNur’s hybrid renewable energy facility will be situated in the Tunisian desert where solar and wind resources are extremely high enabling the most efficient integration of renewable technologies with storage. The combination of these technologies enables the plant to produce low-cost solar power up to 24 hours a day 365 days a year.

To deliver the power to private buyers in Europe the TuNur Italy dedicated transmission line will connect the power plant to the European network via Terna’s HV network in Italy.

The transmission line is based on High Voltage Direct Current technology combining +/-525kV DC architecture and VSC (Voltage Source Control) HVDC converter technology. The project will consist of two independent 1,000MW bipolar systems providing a high reliability and efficiency of the transmission system.

HVDC technology is a key driver for increased cross border electricity transfer and renewable energy deployment. There is growing demand from Europe to enhance transmission and integration with neighbouring regions including North Africa.


Project in Numbers


Submarine Transmission Line


HVDC Transmission Capacity


of new Renewable Capacity


Maximum Water Depth

> 3.9M Tonnes

of Carbon Dioxide Reduction per year

> 800M€

per year of Social Economic Welfare increase

> 13TWh

per year of Clean Power

> 2million

homes supplied

> 20000

Direct & Indirect Jobs

The Route

The HVDC transmission line starts with the connection point to the power plant in Southern Tunisia and then runs North to a landfall point in Northern Tunisia before moving via submarine line to a landing point at Montalto di Castro, just north of Rome, in Italy. The transmission architecture is based on two independent VSC bipolar HVDC systems whereby each system has two transmission cables.


From the power plant in Southern Tunisia the transmission project will consist of +/-  525 kV AC and DC overhead lines spanning 660km to the landfall point in Northern Tunisia.

Submarine Route

From the Tunisian landfall point +/- 525 kV DC submarine cables will run for 661km to the shoring point at Montalto di Castro, in Lazio, Italy.


Once landed in Italy a 5km +/- 525kv DC underground cable will connect to the converter station in Montalto di Castro before connecting to the existing HV substation in Italy via 2km of 400kv AC underground cables.


The Benefits

The TuNur Italy project will facilitate many benefits to Tunisia, Italy and Europe by enabling the investment in significant amounts of new renewable energy capacity capable of producing low-cost baseload zero carbon power. The project will also generate significant investment, job creation and socio-economic development in Tunisia and the region.

New Infrastructure

  • Infrastructure to reduce price differentials between EU and non-EU countries.
  • Infrastructure to address system adequacy deficiencies and mitigate the risk of power failures.

Increased Renewable Energy

  • Infrasructure to directly connect more than 4,000MW of new solar energy capacity to the European network supporting regional decarbonization objectives.
  • Due to the use of strorage the project produces baseload or controllable power  to help the balancing of the network and mitigate the need for new fossil fuel capacity.

Regional Integration

  • Large scale investment into the region, further enabling EU and Tunisia trade and  technology transfer.
  • Boost economic development and local regions creating variety of job opportunities.

Security of Supply

  • Increase in renewable energy deployment providing further energy security and decarbonization to the European electrical network.
  • Infrastructure to improve system flexibility and stability while balancing supply/demand variance to both Tunisian and Italian sides.


HVDC technology is used to transfer a large amount of energy over long distances facilitating the transfer of electricity from high-capacity generation plants to the local networks where the energy is consumed.

HVDC transmission system presents many advantages for transiting large capacities over long distances including low losses, system reliability and flexibility. HVDC provides an economic solution for long distances with minimal low losses, suitability for underwater applications and ability to manage instabilities.

For this reason, HVDC technology is a key driver for increased cross border electricity interconnection and renewable energy deployment.

As of today, there are a large number of cross border HVDC projects ongoing in Europe and globally, for both on land and subsea applications.


TYNDP 2022

TuNur Italy has been included in the European Network of Transmission System Operators for Electricity (“ENTSO-E”) Ten Year Network Development Plan for 2022 (“TYNDP 2022”) under Project No.283






Design & Engineering


Permitting & Authorization




Construction Phase