Main grid development activities currently underway


Main works of the Development Plan authorized and in the authorization proces

Main works of the Development Plan authorized and in the authorization proces


Main works completed

In 2012, Terna increased its transformation capacity by about 10,500 MVA4 of power and put more than 30 km of new High and Very High Voltage lines into operation.

The main works completed during 2012 were the following:

  • installation of PST (Phase Shifting Transformers) in the 380 kV electricity stations of Foggia and Villanova, to optimize energy flows on the H&VHV grid of the Centre - South;
  • the new 220 kV underground cable power lines “Pellerina – Levanna”, “Pellerina - Turin West”, “Pellerina – Martinetto” and electricity station in SF6 of Pellerina (Rat. 220 kV city of Turin);
  • installation of 285 MVAr, 380 kV reactances at the 380 kV electricity stations of Scandale, Aurelia, Montalto, Santa Sofia and Feroleto;
  • expansion of the 150 kV section of the 380 kV electricity station of Brindisi Sud;
  • construction of the 380/150 kV electricity station of Castellaneta, inserted in input-output on the “Matera – Taranto” 380 kV line;
  • construction of the 380/150 kV electricity station of Aliano and the associated connections to the H&VHV grid (150 kV in underground cable connections are being installed);
  • as regards the Sorgente – Rizziconi 380 kV connection, the first stage of the work was completed in the 380 kV electricity station of Scilla, in Calabria, with the commissioning of the 150 kV section and of the HV cable connections to the NTG;
  • in relation to plants designed to collect and use energy production from renewable sources in the South, important 380 kV and 150 kV electricity stations were built, numerous limitations of long stretches of the 150 kV grid were removed and numerous minor projects were carried out.

Main works authorized

During 2012, Terna obtained authorization for a number of important development works, including:

  • in the context of rationalizing the Turin grid: 220 kV Polytechnic electricity station and 220 kV cable lines “Stura – Turin Centre”, “Polytechnic - Turin South”, “Martinetto – Levanna” and “Pianezza - Pellerina”;
  • Musocco 220/132 kV station and related connections to the NTG, needed for the Expo 2015 in Milan;
  • as part of the work of doubling the primary Adriatic backbone, the 380 kV “Villanova – Gissi” stretch of power line was authorized in January 2013;
  • 380 kV “Feroleto – Maida” Trans-Calabria power line;
  • connections at 150 kV in submarine cable “Capri - Torre Annunziata” and underground cable “Cuma – Patria” for interconnection of the Campanian Islands to the continental grid;
  • rearrangement of the 150 kV grid in the Sorrentine Peninsula.

Main works at the authorization stage

During 2012, Terna began the authorization procedures for various important development projects, including:

  • 380 kV power line “Foggia – Larino – Gissi”, as part of the doubling of the primary Adriatic backbone;
  • connections at 150 kV to feed in the wind power production east of the Troia 380/150 kV electricity station;
  • electricity stations of S.Teresa, Nuraminis and Selegas for the mesh of the 150 kV grid in Sardinia. 

In addition the main projects with authorization procedures begun in previous years and still in progress are listed below:

  • 380 kV “Redipuglia - Udine Ovest” power line;
  • 132 kV “Elba - Continent” power line;
  • 380 kV “Deliceto - Bisaccia” power line to facilitate the energy production of plants using renewable sources in the South;
  • Rearrangement of the North Calabrian grid;
  • the “Avellino North - Montecorvino” stretch; part of the 380 kV “Montecorvino – Avellino North – Benevento II” power line, to increase the exchange limits on the Centre-South, South section;
  • 380 kV power line “Paternò - Pantano – Priolo” in Sicily;
  • 380 kV power line “Chiaramonte Gulfi - Ciminna” in Sicily.

Main construction sites open

The most important work still in progress being carried out during 2012 involved activities to reduce network congestion, connect new generating plants (especially those using renewable energy sources), and increase the reliability of the national transmission grid with ever-greater attention to environmental and security issues.

The main construction sites open in 2012 are summarized below, together with the related projects:

  • 380 kV power line “Foggia - Benevento II”, length approximately 85 km;
  • 380 kV power line “Feroleto - Maida”, length approximately 13 km;
  • creation of several 150 kV cable connectionsat the 380 kV electricity stations of Aliano (Basilicata), Lacchiarella (Lombardy) and Villafranca (Sicily);
  • expansion of the existing 380 kV electricity stations of Foggia (Puglia) and Scandale (Calabria) with a further 150 kV section, and installation of a new ATR to connect new plants;
  • installation of a 285MVAr 380 kV reactor at the Teramo electricity station;
  • construction of a new 380/150 kV electricity station in Manfredonia (Puglia).

At the same time, during 2012 work begun in previous years continued on the following projects:

  • new HVDC cable connection “Grand’Ile – Piossasco” to increase the transport capacity on the northern border with France;
  • rearrangement of the grid between Venice and Padua including the 380 kV power lines “Dolo - Camin - Fusina”;
  • new HVDC connection Italy – Montenegro (“Villanova – Lastva”) for energy exchanges with the Balkan region;
  • new 380 kV double three-phase power line joining the 380 kV stations of Trino, in the province of Vercelli, and Lacchiarella in the province of Milan, measuring more than 100 km in length, work on which is at an advanced stage;
  • new 380 kV submarine cable connection “Sorgente-Rizziconi”: the work at the 380 kV electricity station of Sorgente (Sicily) is nearing completion; the site of the 380 kV electricity station of Villafranca (Sicily) is being prepared; the first line of submarine cables between Villafranca and Favazzina has been laid, including the first optical fibre cable; the tunnel and the sub-horizontal gallery at Favazzina are currently being dug. In addition, work on the 380 kV overhead line in Calabria is 70% complete, and on the Sicilian side, work on the power line between Villafranca and Sorgente is in progress;
  • 380 kV electricity stations for connecting renewable source systems: work has begun on the electricity station of Erchie, and a bay for temporary connection of the wind power producer has been in operation since 20 December.

Following an approach based on the utmost transparency towards its stakeholders, the Company has developed a new web platform, which since March 2011 has made it possible to visualize up-to-date online information on the progress made on the works included in the Development Plan. See:

Projects set out in the Development Plan for the use of energy produced by renewable source systems

Implementing Directive 2009/28/EC and the National Action Plan (NAP) prepared by the Ministry of Economic Development, Terna inserted a specific section in the National Development Plan which defines the actions necessary for full use of the energy deriving from the production of renewable source systems.

The grid analyses carried out in order to facilitate the use and development of production from renewable sources have enabled us to identify actions for both the primary 380–220 kV transmission grid and the 150–132 kV high voltage grid.

The figure below shows a summary of the main development projects that involve the Very High Voltage grid.

main development projects that involve the Very High Voltage grid

The development projects on the 150 kV transmission grid regard many Italian regions in the South and mainly provide for new 380/150kV collection and transformation electricity stations, new 150–132kV switching stations, removal of limitations and expansions of portions of HV grid and local rearrangements often related to insertion on the primary grid of the new VHV/HV collection stations.

TERNA's commitment in ENTSO-E in 2012

TERNA's commitment in ENTSO-E in 2012


Terna is a member of the ENTSO-E, the European Network of Transmission System Operators, which represents 41 TSOs belonging to 34 countries, including the countries of South-Eastern Europe (excluding Albania and Kosovo).

Since March 3, 2011, under the terms of the EU's so-called “Third Energy Package”, the ENTSO-E, which is based in Brussels, has been the official organization for cooperation of all grid operators at the community level. The activities of the ENTSO-E are carried out in close coordination with the European Commission and the Agency for the Cooperation of national Energy Regulators (ACER).

European Network Codes

The ENTSO-E has the task of preparing European Network Codes, on the basis of the annual priorities defined by the European Commission and in conformity with the ACER guidelines. The European Network Codes refer to connection to the grid (generators, distributors and end users), to the market and to operation of the electricity system: once they have been finalized, including a process of consultation with the reference stakeholder, they will be adopted by the European Commission through the Comitology process, becoming supra-national and binding legislative acts which will prevail over the national codes as regards cross-border questions.

In 2011, the European Commission, the ENTSO-E and the ACER established a three-year work programme which provides for the composition of twelve European Network Codes for the electricity industry and which takes into account the political conclusions of the European Council of February 4, 2011, which fixed 2014 as the term for completing integration of the national and regional electricity markets.

In order to achieve this 2014 objective, the ENTSO-E is already working on composing nine Network Codes. Two of the codes on the subject of connection, and one on the subject of the market, were already submitted for ACER's opinion in 2012, while the remaining six will be assessed by ACER during 2013. All the codes, however, must be approved by the European institutions to then become binding by 2014. 

Transparency of the markets

The ENTSO-E contributes to energy market transparency, through the establishment of a centralized platform for the publication of privileged data and information. During 2013, the European Commission will adopt community guidelines on the subject of transparency, prepared with intense involvement of the ENTSO-E. In order to respond better and more rapidly to the requirements of the Commission's Regulations, the European grid operators are already updating the centralized platform.

Ten-Year European Network Development Plan

The ENTSO-E prepares the Ten-Year European Network Development Plan (TYNDP), starting from the national investment plans, and taking into account the community guidelines regarding the trans-European energy network. In addition, the TYNDP identifies the need to develop cross-border capacity and any possible obstacles, such as those deriving from authorization procedures.

The Plan is published every two years: the 2012 edition was published in June of last year. Together with the other TSOs, Terna is already working on the next edition which will come out in 2014. The new Plan will be made up of six regional investment plans, the Development Plan for the European grid, and the report on the forecast scenarios and adequacy of the European electricity system. In addition, this edition will, for the first time, feature forecasts on the state of the grid in 2030. This vision for 2030 represents an intermediate step in the modular development of the “Electricity Highways” of 2050, inserted among the objectives of the European Commission “Energy Roadmap 2050”, in order to complete decarbonisation of the European electricity system by that date.

Among the numerous mandates assigned to the ENTSO-E by the Third Energy Package, there is also publication of European Research and Development Plans regarding the electricity transmission industry. For this reason, in 2012, the ENTSO-E published a Ten-Year 2013-2022 Roadmap, which identifies technological gaps which need to be closed in order to achieve the 20-20-20 community objectives set in 2009, and a 2014-2016 Implementation Plan, which defines the priority R&D themes which the European transmission system operators must launch in the next three years.


(4) Of which about 7,200 MVA related to the PST -Phase Shifting Transformers –installed in  the Villanova and Foggia plants.