Number of plants

The number of plants belonging to the entire Group at 31 December 2012, and at 31 December 2011, is shown in the following table:

31.12.2012 TERNA 31.12.2012 TERNA RETE ITALIA S.r.l. 31.12.2012 TOTAL 31.12.2011 TOTAL VARIATION 01 ÷ 12.2012
Stations 449 19 468 454 14
Transformers 648 2 650 638 12
136,489 MVA 320 MVA 136,809 MVA 126,623 MVA 10,187 MVA
Bays 4,964 83 5,047 4,927 120
Lines 40,931 km 16,507 km 57,438 km 57,649 km - 211 km
3-phase power lines 2,347 1,730 4,077 4,040 37
45,904 km 17,543 km 63,448 km 63,625 km - 178 km
Km and MVA are calculated to 3 decimal places and rounded off to the unit.
 

A further detail of the number of Terna S.p.A. and Terna Rete Italia S.r.l. plants at 31 December 2012 is shown in the following two tables:

Electrical stations Units 2011 2012 Variation %
380 kV
Stations No. 147 150 3 2.04
Power transformed MVA 93,448 103,648 10,200 10.92
220 kV
Stations No. 153 154 1 0.65
Power transformed MVA 30,084 30,227 143 0.48
Lower voltages (≤150 kV)
Stations No. 154 164 10 6.49
Power transformed MVA 3,092 2,935 -157 -5.08
Total
Stations No. 454 468 14 3.08
Power transformed MVA 126,623 136,810 10,187 8.04
MVA calculated to 3 decimal places and rounded to the unit.
Long-distance power lines Units 2011 2012 Variation %
380 kV
Length 3-phase power lines km 11,808 11,810 2 0.01
Length lines km 10,893 10,894 1 0.01
220 kV
Length 3-phase power lines km 12,058 11,987 -71 -0.59
Length lines km 9,710 9,638 -72 -0.75
Lower voltages (≤150 kV)
Length 3-phase power lines km 39,759 39,651 - 108 - 0.27
Length lines km 37,046 36,907 - 140 - 0.38
Total
Length 3-phase power lines km 63,626 63,488 - 178 - 0.28
Underground cable km 1,327 1,368 41 3.09
Submarine cable km 1,348 1,348 - -
Direct current (200 - 400 - 500 kV) km 2,066 2,066 - -
Length lines km 57,651 57,440 - 211 - 0.37
Underground cable km 1,327 1,368 41 3.09
Submarine cable km 1,348 1,348 - -
Direct current (200 - 400 - 500 kV) km 1,746 1,746 - -
Incidence of direct current connections
3-phase power lines % 3.25 3.26 0.01 0.28
Lines % 3.03 3.04 0.01 0.37
MVA calculated to 3 decimal places and rounded off to the unit. Percentages calculated to 5 decimal places and rounded off to 2 decimal places.