Siemens to help connect Crete with mainland Greece
A consortium led by Siemens
Gas and Power (Siemens Energy) has been awarded a turnkey contract for
two converter stations for a Greek high-voltage direct-current (HVDC) link
that will connect Crete, Greece’s largest and most populous island, with
the mainland of Greece. The project will support an exchange of electricity
of up to 1,000 MW.
Ariadne Interconnection S.P.S.A., a wholly owned entity of the Greek independent
power transmission operator IPTO, issued the award with the total order
value of €370 million. Commissioning of the interconnector is scheduled
Siemens will cooperate in a consortium with TERNA S.A. (Member of GEK TERNA
Group). The EPC (Engineering, Procurement and Construction) turnkey contract
comprises of design, supply and installation of a 1,000 MW converter system
at a direct-current voltage of ± 500 kilovolts, a gas-insulated switchgear
(GIS) substation on Crete including 10-year service contracts for the GIS
and Control and Protection systems of both the HVDC stations.
The two converter stations – one located in the Attica region near Athens
and the other near Damasta in the north of Crete – will be linked by a
330 kilometre long direct-current (DC) power cable. Terna will be responsible
for the HV distribution systems, the entire civil works and the erection
of all equipment of the HVDC project.
“The Attica-Crete interconnector is another example of the added-value
that Siemens Energy can offer customers to advance the global energy transition.
I’m very proud that our proven state-of-the-art HVDC technology will enable
an increased integration of renewable energy, reduce reliance on fossil
fuel, and enhance grid security," said Beatrix Natter, CEO of
the Transmission Division at Siemens Energy.
Both converter stations will use HVDC Plus voltage-sourced converters in
a modular multilevel converter arrangement (VSC-MMC) that converts alternating
current (AC) to direct current and DC back to AC on the other side of the
link. Siemens stated that the system combines the advantages of HVDC transmission
with benefits like AC voltage control, black-start capability, minimised
power transmission losses, grid stabilisation and high availability.
Currently, Crete’s energy supply mainly relies on outdated fossil-fueled
power plants, that will be shut down by the end of 2022. The interconnector
will facilitate the transmission of energy from renewable resources generated
on the Greek mainland to the island. Thus, the interconnector will reduce
carbon emissions by 500,000 tons in its first full year of operation.
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