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Greek ADMIE awards major HVDC cable contracts for Crete–Attica link [free access]

May 28, 2020

The Greek Independent Power Transmission Operator (IPTO), Anexartitos Diacheiristis MetaforasIlektrikis Energeias’ (ADMIE) subsidiary—Ariadne Interconnection—has awarded three separate contracts to the Italian cable company Prysmian Group, French copper optical fibre cable manufacturer Nexans, and the Danish NKT. The contracts have been awarded for the 1,000 MW Crete–Attica high voltage direct current (HVDC) interconnector project in Greece. 


The EUR270 million contract awarded to Prysmian comprises two lots—wherein the first lot, worth EUR250 million, involves the design, supply, installation (including civil works) and commissioning of 500 kV HVDC undersea cable (USC) systems. The 335-km-long, 500 kV cable with mass impregnated nondraining (MIND) design will form half of the total 1,000 MW bipole interconnection. The second lot, worth EUR20 million, involves the design, supply, installation and commissioning of two submarine telecommunication links for a total length of 670 km between Crete Island and the Attica region. The delivery and commissioning for both lots are scheduled for completion by 2023.


Nexans’ scope of the contract, worth nearly EUR220 million, includes the design, manufacturing and installation of a 335 km HVDC USC system. Over the course of the 35-month project, Nexans will provide one 500 MW HVDC subsea cable system which will form the other half of the total 1,000 MW bipole subea interconnection. 


NKT received a EUR115 million contract to deliver and install the onshore power cable system for the interconnector project. The latter cable system will consist of 2x33 km, 500 kV mass impregnated, HVDC power cables, and 33 km of medium-voltage direct current (MVDC), cross-linked polyethylene (XLPE) cables for connecting sea electrodes. In addition, the order covers 2x11 km of 500 kV mass impregnated HVDC power cables and 11 km of MVDC XLPE cables for onshore installation on Crete.


The approximately EUR1 billion interconnector project is deemed as urgent to avert electricity shortages on Greek Crete island. It includes the construction of two alternating current (AC)/DC converter stations with a rated power of 1,000 MW (2x500 MW) of voltage up to 500 kV (operated as symmetrical bipole convertor stations); two 335-km long, HVDC USC system with a rated power of 1,000 MW in bipolar operation, stretching from the Megara beach (Attica) to the Korakia beach (Crete); and two electrode stations at both ends. It also involves the construction of a Korakia (Crete) terminal transition station, a new 150 kV coupling gas insulated switchgear (GIS) substation for the connection of the AC/DC converter station to the 150 kV AC Crete system, and construction/upgradation of 150 kV lines in Crete.