Much of Terna’s waste is recycled for production. Only a small part is delivered to dumps and therefore entails an environmental impact. The waste recycled in 2010 amounted to 89% of the total (83% in 2009, 91% in 2008).


  2010 2009 2008 (2)
Waste produced 5,515.9 7,053.3 8,023.7
  Hazardous 3,013.3 3,995.7 4,011.4
  Non-hazardous 2,502.6  3,057.5 4,012.3
Recycled waste 4,912.8 5,856.3 7,272.6
  Hazardous 2,849.5 3,322.0 3,618.6
  Non hazardous 2,063.3 2,534.4 3.654,0
Waste delivered to dump (3) 626.4 1,043.1 751.1
  Hazardous 191.5 630.9 392.8
  Non hazardous 435.0 768.7 358.3

(1) Only waste stemming from the production process is included. Waste produced by service activities (urban waste) is excluded. Also excluded is waste belonging to the “excavated earth and rocks” and “sewage” categories, because – especially in the case of significant quantities – it has an exceptional aspect connected with the construction of particular work in stations and would make the data series non-homogeneous. The figures for the excavated earth and rocks and for the sewage amounted to 1,541 tons in 2010, 16,053 tons in 2009, and 69,023 tons in 2008.

(2) The 2008 values include the waste of Ternai Partecipações. For the Italy boundary alone, the total waste for 2008 amounted to 8,010.7 tons.

(3) Since 2009 the values regarding waste delivered to dumps are the result of a precise collection of data and may differ from the simple difference between waste produced and waste recycled (a calculation criterion that was used in 2008 as well) because of the temporary storage of waste straddling two years (part of the waste recycled or delivered to dumps in 2010 may have been produced in 2009). 

The reduction of about 20% of the waste produced is due mainly to the closing of large construction sites after the plants had been completed (SA.PE.I.).

Alike the resources used, waste is connected mainly with the modernization and maintenance of the electric infrastructure.  

The main non-hazardous special waste produced by Terna’s operating activities consists of:

  • metal (about 65% of the total) from discarded transformers, electrical equipment, and machinery (for example, generating sets), more than 90% of which is recycled;
  • glass and ceramic (about 14% of the total) from discarded insulators (materials used to insulate conductor cables from support towers), more than 90% of which is recycled;
  • wood (about 10% of the total), mainly from the packaging of the materials purchased, more than 80% of which is recycled.

The main hazardous special waste produced by Terna’s operating activities consists of:

  • metal (about 68% of total hazardous waste) from discarded transformers, electrical equipment, and machinery, contaminated by hazardous substances, of which – after treatment by other companies – more than 90% is recycled;
  • batteries (lead and nickel, about 5% of the total), which in the event of blackouts enable emergency generating sets to be turned on to keep the service of electricity transformation and transportation operating during emergencies and 100% of which is recycled;   
  • dielectric oils for insulating transformers (about 34% of the total) replaced after the periodical checks performed for transformer maintenance, which constitute hazardous waste and of which about 60% is recycled (a lower percentage than in the other cases, because it also includes the non-recyclable oils present in the collection tanks mixed with rainwater).    

Waste delivered to dumps consists mainly of materials used in the maintenance and cleaning of plants (mud, oily emulsions, and rags containing oils and solvents) and insulating materials containing asbestos for which no kind of recycling is provided. All these items together weigh about 75% of the total delivered to dumps.        
For further details regarding the quantities and kinds, see the indicator tables.