Much of Terna’s waste is recovered for productive recycling. Only a small part is delivered for dumping, and thus entails an environmental impact. In effect, 83.0% of all waste is recycled.

WASTE BY CATEGORY (1) 

Tons


200920082007
Waste produced
7,053.38,010.74,562.9
hazardous3,995.74,009.61,793.0
non hazardous3,057.54,001.22,769.9
Waste delivered for recycling
5,856.37,270.63,960.8
hazardous3,322.03,616.81,560.6
non hazardous2,534.43,653.82,400.2
Waste delivered for dumping(2)1,043.1740.2602.1
hazardous630.9392.8232.4
non hazardous412.3347.4369.7

(1) Only waste that is part of the production process is included. Waste produced by service activities (urban waste) is not included. Also excluded is waste belonging to the “excavated earth and rocks” and “liquid sewage” categories deriving from the same, because they have – especially in large quantities – exceptional characteristics connected with particular civil works carried out in stations and would make the data series non-homogenous. The inclusion of these two items would have led to the following results in 2009: total waste produced: 23,106 tons, of which 4,041 tons were hazardous waste and 19,065 tons were non-hazardous waste.
(2)
The figures on the waste delivered for dumping in 2009 are the result of an accurate collection of the data and may differ from the simple difference between waste produced and waste recycled – the calculation criterion adopted in 2007 and 2008 – because of the temporary storage of waste straddling the two years (i.e. part of the waste recycled or delivered for dumping in 2009 may have been produced in 2008).

Like the resources used, the waste concerns mainly from the upgrading and maintenance of the electric infrastructure.

The main non-hazardous special waste produced by Terna’s operations consists of:
  • metallic waste (about 65% of the total) from the dismantling of transformers, electrical equipment, and machinery (for example, generating units) no longer used, of which more than 90% is recycled;
  • glass and ceramic (about 14% of the total) from the dismantling of insulators (materials used to insulate conductor cables from pylons) no longer used, of which more than 90% is recycled;
  • wood (about 10% of the total), mostly from the packaging of the materials purchased, of which more than 80% is recycled.
The main hazardous special waste produced by Terna’s operations consists of:
  • metallic waste (about 68% of the total), contaminated by hazardous substances, from the dismantling of transformers, electrical equipment, and machinery no longer used, of which more than 90% is recycled after outsourced treatment;
  • batteries (lead and nickel, about 5% of the total), which enable generating units to be turned on to keep the service of transforming and transporting electricity in operation during black-outs and 100% of which are recycled;
  • dielectric oils for insulating transformers (about 34% of the total) replaced following periodical maintenance checks, of which about 60% is recycled. This percentage is lower than in the other cases because it also includes the oils mixed with rain water in the collection vats, which cannot be recycled.

The waste delivered for dumping mainly consists of materials stemming from the maintenance and cleaning of plants (slush, oily emulsions, and rags containing oils and solvents) and insulation materials containing asbestos, which cannot be recycled. These items account for about 75% of the total delivered for dumping.