Grid Development Activities in 2011


Summary of the main works that have been completed or authorized or that are still being implemented

Summary of works

Main works implemented

In 2011, an increase in processing capacity of nearly 1,500 MVA was reported and more than 70 km of new high and extra-high voltage lines entered into operation.

During 2011 and in early 2012, in addition to the two 380 kV Chignolo Po-Maleo power stations, the new 380 kV d.t power line connecting Chignolo to Maleo was also completed, as part of the “380 kV Upgrading Plan in the Province of Lodi”.

During the year the following works were also completed:

  • 220 kV Camporosso station and installation of a PST on the 220 kV “Camporosso-Trinitè Victor” power line;
  • 220 kV cable power lines and overhead lines included in the 220 and 132 kV upgrading in the province of Turin;
  • new 220 kV station in Torino Nord and relative connections;
  • 220 kV Gadio-Porta Volta buried cable power line, as part of the upgrading of the electricity grid in Milan;
  • installing a condenser battery in the Cislago and Cremona stations;
  • new 220 kV power station in Cardano, Trentino Alto Adige;
  • 150 kV “Portocannone-S.Martino in Pensilis” power line;
  • 220 kV Frattamaggiore-Secondigliano buried cable power line, as part of the upgrading of the electricity grid in Naples;
  • new 380/150 kV station in Deliceto, bypass connection for the 380 kV “Candela – Foggia” lines and 380 and 150 kV connectors: “Agip Deliceto-Ascoli S.” power line, functional for connecting renewable source plants being built;
  • new 380/150 kV station in Troia, bypass connection for the 380 kV “Foggia-Benevento II” line and 380 kV connectors, functional for connecting renewable source plants being built;
  • new 150 kV SE 380/150 kV Bisaccia connectors: 150 kV “Bisaccia-Calitri” power line, functional for connecting renewable source plants being built;
  • significant measures for strengthening the 150 kV main lines for wind power production in Campania, Basilicata and Puglia;
  • 380 kV station in Brindisi Pignicelle with finishing and adapting the 150 kV section;
  • installing a new reactor in the 380 kV stations in Scandale and Rossano;
  • strengthening the HV grid in Gallura.


Main works authorized

During 2011, Terna obtained authorization for a number of important development works, including:

  • new HVDC “Piemonte-Savoia” cable interconnection and related works;
  • 220 kV Baggio-Ric. Ovest cable power line as part of the upgrading of the electricity grid in Milan;
  • new 380 kV “Dolo-Camin” power line and related works as part of the upgrading of the HV grid in Venice and Padova;
  • new 150 kV switching station in S. Salvo and related connectors;
  • new “Italy-Montenegro” HVDC submarine cable interconnection;
  • installing a PST at the 380 kV station in Villanova;
  • 380 kV “Foggia-Benevento” power line between Puglia and Campania;
  • installing a PST in the 380 kV station in Foggia;
  • 380 kV buried cable connectors between the 380 kV power stations in Priolo Gargallo and Melilli and related works as part of the new 380 kV “Paternò-Pantano-Priolo” power line.


Main works being authorized

During 2011 Terna began the authorization process for a number of important development works, including:

  • new 220 kV “Torino Sud-Politecnico” buried cable power line linked to the 220 kV upgrading of Turin;
  • 220 kV Ponte-Verampio bypass (upgrading of HV grid in Val Formazza), in concomitance with the new 380 kV Trino-Lacchiarella power line;
  • a new part of measures linked to the 220 kV upgrading of Milan;
  • new 380/132 kV station in the Southeastern area in Brescia and related works;
  • new 220/132 kV station in Agnosine, as part of the upgrading of Val Sabbia;
  • first upgrading phase of the HV grid in the province of Lodi;
  • new 220 kV Polpet station involved in the upgrading and development of the NTG in Media valle del Piave;
  • new 380/132 kV station north of Bologna and related connectors to the HV and EHV grid with burial of existing 132 kV line segments;
  • new 150 kV switching station in Celano and related connectors to the NTG;
  • other measures linked to the upgrading of Rome’s metropolitan area;
  • new 150 kV Sorrento station, new 150 kV marine cable connection “CP Castellammare-Sorrento-Capri” and new 220/150 station in Scafati and connectors, as part of the restructuring of the HV voltage in the Sorrentina peninsula;
  • significant measures linked to the 220 kV upgrading of Naples;
  • other measures on the HV grid for collecting wind power production in Campania and Calabria;
  • new 380 kV power line between the power station in Deliceto and the 380 kV power station in Bisaccia and the new d.t. connectors of the power station in Deliceto to the existing 150 kV “Accadia-Vallesaccarda” line and the new 150 kV d.t. PS Troia-SE Roseto power line, functional for connecting renewable source plants being built in the area between Foggia and Benevento;
  • upgrading the HV grid in the municipality of Castrovillari, functional for restructuring the Nord Calabria grid;
  • initial restructuring of Palermo’s metropolitan area;
  • new 380 kV “Chiaramonte Gulfi-Ciminna” power line.


Main building sites open

In 2011, upon receipt of the approvals, Terna opened several sites for important development works, including the following:

  • construction for the new 380 kV “Trino-Lacchiarella” connection which will allow for greater transfer capacity between Piedmont and the load area of Milan and greater benefit for the electricity system between segments of the NTG in Piedmont and Lombardy, by improving the flexibility and operational safety of the grid on the territory, thereby reducing the risk of grid congestion;
  • measures for strengthening the 380 kV “Foggia-Benevento II” power line which will help increase the production from small generation centers and power exchange between the two regions, improve the dispatchability of high-efficiency renewable and thermal energy sources, improve the reliability and quality of the electricity transmission service, thereby reducing the probability of energy not supplied;
  • works for installing a power flow controlling device (PST - Phase Shifting Transformer) on the “Foggia-Benevento II” line, to optimize the use of transmission assets and reduce the risk of congestion and any subsequent production limitation regarding the new plants in Southern Italy, specifically the renewable power plants that are being built between Foggia and Benevento.

Terna has also opened sites for installing a flow controlling device (PST) at the 380/150 kV Villanova power station; this will regulate power flows on the extra-high voltage grid and will be functional for connecting renewable power plants which are being built in the area.

Also in 2011, Terna started work on the new 380 kV “Dolo-Camin” connection which will improve the security of power loads and facilitate power exchange between eastern and western areas, thereby achieving a reduction in transmission losses.

Of significant importance are the many sites that Terna has opened during the year for the construction of new 380/150 kV power stations which will be used for collecting renewable power produced in central and southern Italy.

In keeping with its fully transparent approach to stakeholders, Terna has developed a new web platform which as of March 2011 has enabled users to view online updates on the progress status of the works indicated in the Development Plan. Available at:


Measures for the use of renewable energy sources as provided in the Development Plan

By implementing Directive 2009/28/EC, the National Action Plan (NAP) drawn up by the Ministry for Economic Development, Terna has added a special section to the National Development Plan that contains the measures needed to fully utilize electricity produced by renewable energy plants.

The analysis of the power grid aimed at promoting the use and development of electricity produced from renewable sources has identified a number of measures to be implemented on the primary 380-220 kV transmission grid as well as on the 150-132 kV high voltage grid. The schematic diagram below shows the main development measures affecting the extra-high voltage grid.

Measures needed to make full use of the electricity produced by renewable energy plants


Development measures on the 150 kV transmission grid are taking place in several Italian regions, especially in the South, and include the construction of new 380/150 kV collecting and transforming stations, new switching stations, strengthening existing lines and the installation of energy storage devices on the 150 kV grid segments which are more likely to experience problems over the short to medium term.


ENTSO-E: European Network of Transmission System Operators for ElectricityEU23


Terna belongs to the ENTSO-E, the European Network of Transmission System Operators for Electricity that represents 41 Network Operators belonging to 34 European countries including the South-East European ones (excluding Albania and Kosovo).

As of March 3, 2011, the date on which the EU Third Energy Package was applied, ENTSO-E, with its head office in Brussels, is the EU cooperation body for all Network Operators. ENTSO-E's activities are conducted in close coordination with the European Commission and the Agency for the Cooperation of Energy Regulators (ACER).

European Grid Codes

ENTSO-E has the task of drafting European Grid codes, on the basis of annual priorities established by the European Commission in line with the framework guidelines adopted by ACER, following consulting with stakeholders. European grid codes, adopted by the Commission, will become supranational and binding legislative deeds that will prevail over the national ones regarding cross-border issues.

In 2011, the European Commission, ENTSO-E and ACER established a three-year work plan that includes twelve European grid code projects in the electricity sector, pursuant to the political conclusions of the European Council of February 4, 2011, which set 2014 as the target date by which the integration of electricity markets should be completed.

Terna is working within the ENTSO-E on the establishment of European grid codes for network connection (generators, distributors and end users), with regard to the market and operation of the electricity system.

The first European grid codes will be adopted in 2012. Among them, the code on generation connection is at the most advanced level and will be approved by ENTSO-E by mid-2012, after an extensive consultation process. Upon approval of this code, the market grid codes will follow. Lastly, in 2012, the adoption process of codes for the connection of distributors and the operation of the electricity system and cross-border balancing will begin.

Market transparency

Among its activities, ENTSO-E is also responsible for increasing electricity market transparency, also through the use of a centralized management platform for publishing data and sensitive information. These activities are instrumental in adopting future European Commission guidelines on transparency.

Ten-year Development plan of the European Network

Pursuant to EC Regulation no. 714/2009, ENTSO-E has the task of adopting every two years and publishing a non-binding EU-wide ten-year network development plan that includes integrated market and network models as well as new scenarios and forecasts on the adequacy of supply and demand in Europe. The development plan of the European network is based on national investment plans and takes into account Community guidelines for the development of trans-European energy networks.

The plan also identifies the development needs of cross border transmission capacity and any obstacles, such as those due to authorization procedures.

Although it is not binding by its nature at the national level, the ENTSO-E Development Plan enables national Regulatory Authorities to verify the compliance of national development plans with the European plan. ACER also issues its opinion on this matter.

Terna is working within the ENTSO-E to define the ten-year network development plan which will be published at the end of June 2012, following an extensive consultation process started in March 2011. The 2012 Community development plan consists of six regional investment plans, of the development plan of the European network and of the report on forecast scenarios and adequacy of the European electricity system. Overall, the plan provides for development investments amounting to nearly 104 billion euro for the 34 countries belonging to ENTSO-E to be made over the next 10 years.

According to the Regulation, ENTSO-E ensures coordination of the European Electricity network operations through common tools in ordinary and emergency conditions, adoption of European research plans and security and adequacy assessments of the electricity system during the summer and winter periods.

In addition to performing activities and tasks under the third energy package, ENTSO-E carries out advisory activities and makes proposals to the European Commission and ACER on several aspects related to the regulation of the electricity transmission sector. For example, it carries out activities aimed at promoting the development of smart grids or defining a modular development plan of “Electricity Highways” by 2050 that is in line with the '“Energy Roadmap 2050” objectives of the European Commission.

Within ENTSO-E’s current Governance structure, Terna is present, for the second consecutive term, in the Board, a body limited to the participation of 10 grid operators, with coordination tasks and decision-making powers on the issues assigned by the General Assembly. Terna also supervises the activities of various working groups established in the System Development Committee and participates in the Legal and Regulatory Group, in the “System Operation”, “System Development”, “Market” and “Research & Development” Committees and in the respective working groups, with the commitment of over 60 employees.