In terms of environmental impacts, Terna's most significant activities regard not so much the use of natural resources or the emission of pollutants, but rather the physical presence of power lines and power stations and their interaction with the surrounding natural and man-made environment.
Therefore, the most significant environmental aspects of Terna's activities, in addition to the occupancy of land, are the visual impact on the landscape, electric and magnetic fields, and the effect of power lines on biodiversity, especially birdlife. Greenhouse gas emissions and hazardous waste, however, are relevant within the context of operations.
The construction of new lines responds to the technical needs of the electricity system – such as removing congestion and eliminating risks of overload – and to increasing energy production and consumption, which accompanies the economic growth of specific areas or of the entire country. The environmental actions preceding the coming into operation of grid development investments are described below