Planning and development of accumulation systems

The exponential growth of widespread generation is profoundly changing the national electricity system. Alongside large production plants which use traditional sources such as coal, fuel oil and gas, there are now hundreds of small and very small plants mainly supplied by renewable sources.

This rapid growth is due in particular to the incentive system of the last few years which, even though it is gradually being reduced, is still higher than that of many other European countries. Compared to the benefits in terms of reduction of CO2 emissions, the integration in the electricity system of a large quantity of production from renewable sources (especially solar and photovoltaic) entails two principal problems:

  • excess production compared to consumption at the local level under specific operating conditions;
  • need for a higher (and flexible) level of reserve to balance the rapid variability in production levels, with adequate response times.

In this regard, Terna provided for the development of accumulation systems in the Development Plan of the NTG for the 2011 year and in the Safety Plan relative to 2012. In the first case, for more efficient management of the NTG to maximize the production of renewable sources. On the other hand, for the Safety Plan, the proposal to introduce accumulation systems, with technical characteristics different than those of the Development Plan, meets the requirements for greater safety in management of the network.

After careful verification, both with the Electricity and Gas Authority and the Ministry of Economic Development, Terna received approval to experiment with 35 MW energy intensive batteries (experimental implementation within the Development Plan) and to create 40 MW power intensive batteries (within the context of the Safety Plan).