Skiathos interconnection
OperationalIsland LinkGR160 MW20 kV30 km2022
Basic information
7 fieldsAlso Known As
Pilio-Skiathos interconnection · Skiathos electrical interconnection · Skiathos–Pelion 150 kV line · Πηλιο-Σκιάθος διασύνδεση · Πήλιο-Σκιάθος ηλεκτρική διασύνδεση · Skiathos interconnection · Skiathos electrical interconnection (Northern Sporades) · IPTO Skiathos interconnection · Skiathos–Euboea interconnection · Interconnection of Skiathos Island · Mantoudi–Skiathos project
Status
operational
Capacity
160 MW
Owners
Project Company
Type
island link
Website
Supply Chain (3)
Project Timeline (13)
29 Aug 2022Operations Other
On 29 August 2022, the Skiathos–Euboea electrical interconnection was officially inaugurated at the Skiathos High Voltage Substation. The ceremony, held after the link had already been in full operation since 11 July 2022, highlighted that the 150 kV submarine and land cable system supplied by and installed by Hellenic Cables was successfully delivering reliable power to Skiathos and the Northern Sporades and recognised the project as a major milestone for Greece’s transmission system.
Jul 2022Construction Other
By July 2022, IPTO had completed construction of the Skiathos–Evia interconnection, a technically complex project implemented during the pandemic that enhanced the energy security of the Northern Sporades islands by establishing a 150 kV link between Skiathos and the mainland system via Evia.
11 Jul 2022Onss Commissioned
On 11 July 2022, IPTO (ADMIE) commissioned the new 150 kV closed-type GIS onshore substation on Skiathos as part of the Skiathos–Evia electrical interconnection. The substation, together with the new Mantoudi Evia–Skiathos transmission line and a buried 29 km subsea high-voltage cable, began successfully transmitting the first electrical loads to Skiathos, providing stable and reliable supply from the Greek national transmission system. The project, implemented under a €57 million joint ADMIE–HEDNO investment, is reported as completed with the Skiathos substation in operation.
11 Jul 2022Commercial Operations Full Power
The Skiathos–Evia 150 kV electrical interconnection entered full operation on 11 July 2022, following completion of construction and testing, and since then has been providing reliable electricity from the mainland transmission system to Skiathos and the Northern Sporades, enhancing the islands’ energy security during peak tourist demand.
11 Jul 2022First Power
On 11 July 2022, IPTO put into operation the new Mantoudi Evia–Skiathos 150 kV transmission line and the Skiathos GIS substation, with the interconnection starting to transport the first electric loads from the Greek National Transmission System to Skiathos and the wider Northern Sporades island group via Evia.
28 Jan 2021System Testing
On 28 January 2021, Cenergy Holdings announced that its subsidiary Hellenic Cables had successfully completed the electrical tests of the 150 kV high-voltage submarine cable connecting Skiathos to the Greek National Transmission System at Mantoudi, Evia, marking a key system testing milestone for the Skiathos interconnection and confirming that the cable system met the required performance and quality specifications ahead of full project completion.
Dec 2020Cable Landfall Complete
IPTO’s project timeline for the Mantoudi–Skiathos interconnection records that the submarine cable landing was completed in December 2020, marking completion of the shore landing operations for the 150 kV cable between Evia and Skiathos.
24 Dec 2020Cable Installation Complete
First Subsea reports that Greek contractor Asso.subsea, working for developer IPTO and main contractor Hellenic Cables/Fulgor on the Mantoudi–Skiathos interconnection, finished laying the 30 km subsea cable and installing the cable protection system, with cable laying operations successfully wrapped up on Christmas Eve 2020.
1 Dec 2020Cable Installation Start
Submarine cable installation for the Mantoudi–Skiathos 150 kV AC interconnection began in December 2020, after Fulgor subcontracted Asso.subsea to execute the laying, landing and protection of approximately 29–35 km of HV submarine cable between Mantoudi (Evia) and Skiathos. According to ADMIE-related reporting and a subsequent reference letter, the accelerated installation campaign was carried out over about one week in the last quarter of 2020 and concluded with the landfall of the high-voltage cable at Xanemos beach on Skiathos.
21 Feb 2020Cable Supplier Selected
IPTO/ADMIE selected Hellenic Cables and its subsidiary Fulgor as the cable contractor for the Mantoudi–Skiathos interconnection, awarding a contract of about EUR 42.8–43 million covering the design, supply and installation of approximately 30 km of 150 kV submarine and underground cable between Skiathos and Evia, including subsea protection and connection to the mainland 150 kV transmission system at Mantoudi. The award was publicly announced in January 2020 and the contract for the cable parts was formally signed on 21 February 2020 at the operator’s headquarters, marking the transition of the project into the implementation phase.