Accumulation systems


Italian Legislative Decree No. 28 of 3 March 2011 (Implementation of Directive 2009/28/CE on the promotion of the use of energy from renewable sources) provides that operations planned by Terna in the NTG Development Plan can include electrical energy accumulation systems aimed at “fostering the dispatching of non-programmable plants”.

On 02 October 2012 the Ministry of Economic Development approved the 2011 National Transmission Grid Development Plan (DP) with a recommendation to proceed with a trial programme for energy accumulation systems up to 35 MW, aimed at “fostering the input and withdrawal of energy produced from renewable plants”. At the same time, it also approved the Programme for the adaptation and improvement of defence systems for the security of the electricity system (Defence Plan) 2012-2015 which, among other things, envisages the implementation of an additional 40 MW of accumulation systems aimed at “strengthening the secure operation of the major islands”.

With regard to the actions provided for by the 2011 DP, during 2012 we identified the sites, under the critical guidelines indicated in the plan, suitable for housing the first accumulation systems, and the required documentation was prepared for the start up of the authorisation processes. The related Services Conferences were scheduled for February 2013.

On 19 October 2012 the AEEG published decision 08/12, indicating in detail the necessary elements in Terna's applications for admission to remuneration scheme I4 (a scheme intended specifically for investment in pilot projects for accumulation systems) as indicated in resolution 288/2012. Terna submitted these applications on 03 December 2012, in accordance with the terms indicated, and the AEEG approved the applications from Terna with Resolution 66/2013 of 21 February 2013.

By the end of 2013 we expect to obtain authorisation for the construction of the first accumulation systems and the start of related works.

With regard to interventions provided by the Defence Plan, the accumulation systems suited to this type of use (with performance mainly in power rather than energy) are now in the early stages of marketing, and so, in view of their eventual implementation in the NES, Terna has planned an initial phase of testing of key technologies on the market.

With this premise, in December 2012 the AEEG submitted a proposal for testing solutions based on Lithium and Zebra technologies, aimed at tackling the concerns raised in the 2012 Defence Plan and facilitating the integration of these innovative systems with the current management and dispatching of the electricity system. The AEEG approved the proposal with Resolution 43/2013 of 7 February 2013.

Additionally, sites suitable for the construction of the first accumulation systems were identified, and the technical documentation required for authorisation purposes is also being prepared.

Finally, several Research Institutes and Entities were identified with a view to their involvement in the trials, to assess the application potential of the various systems under analysis.