miscellaneous
The project will enable an exchange of electricity of up to 1,000 megawatts (MW) to enhance
reliability of the power supply and facilitate integration of renewable energy sources in the
power grid. The customer is Ariadne Interconnection S.P.S.A., a wholly owned entity of the
Greek independent power transmission operator IPTO. Commissioning of the interconnector
is scheduled for mid-2023. Total order volume for the consortium is 370 million euros.
Siemens will cooperate in a consortium with one of the leading construction companies in
Greece, 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-kilometer-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.
Currently, Crete’s energy supply mainly relies on outdated fossil-fuelled power plants, that will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.
“The Attica-Crete interconnector is another example of the added-value that Siemens Energy
can offer customers to advance the global energy transition” said Beatrix Natter, CEO of the
Transmission Division at Siemens Energy. “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”.
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. 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.
For additional information:
Siemens HVDC
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