Several refrigerating gases affect the environment because they damage the ozone layer, because of their greenhouse effect, or because they entail both of these effects. In the period 2008-2010, Ternai gradually extended its monitoring of the refrigerating gases contained in its equipment. The extension of the recording boundary included equipment that is in operation without pause for the security of the electricity service and requires a larger number of cooling systems to maintain the temperature constant. In 2010, the monitoring of the refrigerating gases contained in Terna’s equipment was extended to the corporate headquarters in Rome.


  2010 2009 2008 (1)
R22 4,716 4,380 2,592
R407C 1,647 817 784
R410A 494 334 349
Other refrigerating gases (2) 210 6 2

(1) The 2008 values were calculated only for the Italian offices.
(2) The quantity of “Other refrigerating gases” for 2010 regards the Rr134a gas, which is present in the headquarters in Rome.

Among the gases contained in Terna’s equipment only R22 has harmful effects on both the ozone layer and the greenhouse effect. The other kinds of gas present do not have any effect on ozone, but only a potential greenhouse effect. In 2009 Terna started monitoring its consumption of R22, which constitutes 67% of total refrigerating gases present in Terna’s plants. The figure reflects 100% of the plants in which the gas is present and regards consumption, thus involving an overestimate of the gas actually dispersed in the air. In effect, consumption includes the quantity of new gas injected in equipment during maintenance work, which consist initially in the controlled emptying of the aforesaid equipment. These consumption quantities, which can constitute 40% of the total, do not reflect actual atmospheric emissions with effects on the environment.


  2010 2009
 R22 221 1,017

The 2010 figure shows a substantial decrease in R22 consumption with respect to 2009, reflecting the program for eliminating the gas in keeping with the restrictions introduced by the European regulations on the use of substances that reduce the ozone layer (EC Regulation n. 1005/2009 of the European Parliament and the Council). For 2011 the plants with R22 that need an injection of the gas will be replaced with plants that use substances that are not harmful to ozone.