Transmission System Description

The backbone of the Hellenic Electricity Transmission System consists of three, double-circuit 400 kV lines, which transmit electricity mainly from Western Macedonia where 70% of the country's generation capacity is located, to the major electricity demand centers of Central and Sourthern Greece where 65% of the country's electricity demand resides. The Hellenic Electricity Transmission System consists of additional 400 kV and 150 kV lines, as well as of 150 kV submarine cables, which interconnect Andros and the Western Greece islands, Corfu, Lefkada, Cephaloniia and Zakynthos and a 66kV submarine cable connecting Corfu to Igoumenitsa.

As of 30th June 2012, the Hellenic Electricity Transmission System was comprised of 11.303 km of Transmission lines as shown on the table below.

TRANSMISSION LINES (km)

400kV

D.C. 400kV

150 kV

66 kV

TOTAL

OVERHEAD

2.628

107

8.127

39

10.901

SUBMARINE

160

140

15

315

UNDERGROUND

4

82

1

87

TOTAL

2.632

267

8.349

55

11.303

As of 30th June 2012, at the 291 Substations of the Hellenic Electricity Transmission System, 619 Transformers with a total installed capacity of 50.749 MVA were installed.