Connecting new plants

Terna is obliged to connect to the Grid all potential users that so request and identify connection solutions based on criteria that allow continuity and security in operating the grid where the new plant will be connected. In particular, Terna is entrusted with the task of connecting to the National Transmission Grid plants with 10 MW of power or more, and of coordinating the interconnection among grids belonging to other operators, if the requests they receive determine the need of strengthening also the NTG.

Access to grid infrastructure is regulated by the Electricity and Gas Authority (AEEG).

Current regulations govern many stages of the process of accessing the grid, establishing timeframes and costs.

During 2011, Terna received more than 550 new connection requests, of which 64% regarded renewable-energy plants, which together with those received previously, raised the total to over 3,400 dossiers being processed at the beginning of 2012. Among these there were:

  • nearly 2,700 requests with an accepted estimate (not yet authorized), of which nearly 2,400 regarding renewable-energy production plants;
  • nearly 70 dossiers regarding authorized initiatives, of which 64 for renewable-energy plants.

Connections request

In compliance with AEEG resolutions, Terna has also created an IT system to manage connection requests, which makes the process transparent and traceable, as well as making more information available to the counterparty.

During 2011, Terna completed the main grid works to connect 4 renewable energy plants and 1 production plant from conventional sources.

Provision of service connection

Pursuant to the preliminary inquiry established by the Electricity and Gas Authority (Resolution VIS 42/11), with regard to grid connections of electricity production plants by grid operators, all grid operators, including Terna, as the national electricity transmission grid operator, as well as the main category associations, were requested to provide information on the grid connection of electricity production plants and to differentiate the data provided in relation to the reference resolutions.

The inquiry results contained in Resolution VIS 99/11, show that Terna's activities are substantially in line with the requirements set forth in the Regulation.

The table below shows the level of compliance with the maximum estimated time – set forth in the various resolutions adopted by the Authority on the matter – for activities carried out by Terna to fulfill connection requests received between 2005 and 2011. These activities include the preparation of a Minimum General Technical Solution (STMG), a document that is created in response to a connection request, and of a Minimum Detailed Technical Solution (STMD), a document that is needed to carry out the final planning of a grid apparatus by the producer upon receipt of the proper authorization.


Overview of the inquiry results related to the average response time

  Response time by TERNA
  Connection estimate (STMG) (days) STMD (days) Building the connection
  As per resolution Actual As per resolution Actual Average time
Reference Resolution for Connection Requests     
Resolution 281/05- AEEG 90 Between 59 and 88 90 Between 39 and 59 13 Months
Integrated text of active connections AEEG 90 Between 68 and 89 90 Between 30 and 77 14 Months
Integrated text of active connections modified AEEG 90 Between 43 and 93 90 15 -