Energy consumption




The transmission of electricity only requires the direct consumption of energy for a few activities that support the service:

  • fuel for the company’s vehicles (used for line inspections, repairs, and other activities mainly connected with the maintenance of lines and stations);
  • diesel for emergency generators, which are used only in cases where electricity – the normal energy source for equipment - is lacking, specifically to ensure that the electricity system is controlled and normal service restored;
  • oil and natural gas for heating, particularly in offices.

Indirect consumption of energy involves the electricity used to run stations and operating plants (87% of the total) and in offices and workshops.

The table below show Terna's direct and indirect consumption. In some cases (oil for heating), purchases are monitored, with the consequence that the changes from one year to another may reflect procurement cycles rather than a trend of rising or falling consumption. As regards indirect consumption of electricity (offices and stations), the published value for 2012 is based on precise measurements taken from meter readings at 91% of stations and 70% of offices; an estimate of the missing measurements enables us to present figures covering 100% of plants and offices6.

In detail, in 2012:

  • fuel (petrol and diesel) consumption fell by 6%. The reduction in consumption was mainly due to modernization of the vehicle fleet. Compared with 2011, Euro 5 vehicles (better performing from a consumption point of view) increased, while there was a sharp drop in vehicles classified as Euro 4 or lower categories. In addition, vehicles running on petrol were almost completely eliminated;
  • consumption of natural gas and diesel remained in line with 2011, with a slight drop (approximately 2%). In particular, the reduced consumption of natural gas must also be seen in the light of the complete transfer of the Milan offices to the new Pero site, which is connected to a district heating plant;
  • there was a 2% increase in electricity consumption due to the increase in stations in 2012 (3% compared with 2011).


(6) The change from an estimated figure to one based on measurement took place in 2011. The 2011 figure was based on precise measurements taken from meter readings at 79% of stations. The 2010 figure is the result of an estimate that also incorporates corrective factors which emerged thanks to the 2011 measurements.




2012 2011 2010
Direct consumption      
Petrol for vehicles (2) 408 7,504 7,113
Diesel for vehicles (2) 77,570 75,731 74,588
Natural gas for heating  9,241 9,468 7,277
Diesel for generators and oil for heating 11,058 11,289 12,890
Total direct consumption 98,277 103,993 101,869
Indirect consumption      
Electricity for power to stations and offices (3) 638,050 627,480 591,840
1)The direct consumption data in tonnes and thousands of m3 are shown in detail in the indicator tables. To convert the volumes of primary resources into gigajoules the parameters indicated in the GRI – Global Reporting Initiative – G3 protocols were used. . (2) Only the consumption of operating vehicles is considered. (3) The reference for the division of the production mix is the “Monthly Report on the Electricity System” with the results for December 2012, available on the website