Cyclades Interconnection Phase B : Andros - Tinos - Naxos
Island LinkOperationalGR200 MW150 kV4 km
Also known as:Andros–Tinos 150 kV submarine cable, Διασύνδεση Άνδρου – Τήνου 150 kV, Άνδρος–Τήνος υποβρύχια διασύνδεση
Status:Operational
Capacity:200 MW
Project Company:Independent Power Transmission Operator S.A. (IPTO/ADMIE)
Type:island link
Website:www.admie.gr
Cyclades Interconnection — Phase B (Andros–Tinos) is a 150 kV alternating-current (HVAC) submarine cable upgrade replacing older oil-filled single-core cables with modern three-core XLPE cables and higher-capacity armouring. The Andros–Tinos segment is a short subsea link (approximately 4 km) designed and installed to operate at about 200 MVA nominal capacity...
Supply Chain (1)
Project Timeline (10)
Sept 2020Onss Commissioned
Phase B of the Cyclades Interconnection Andros–Tinos–Naxos, which includes the substation works required to connect Naxos to the Hellenic high-voltage transmission system, was completed in September 2020 with the interconnection of Naxos to the High Voltage System.
2020Capacity Upgrade
Under Phase B of the Cyclades Interconnection, IPTO completed the upgrade of the existing 150 kV submarine cable link between Andros and Tinos (together with the Andros–Livadi/Evia section) in early 2020, replacing the older oil-filled cable with new 200 MVA XLPE AC cables and thereby reinforcing the Andros–Tinos corridor as part of the North Power Supply route to the interconnected Cyclades. This completed upgrade enables transmission of around 170 MW from Evia towards the Cyclades, significantly improving supply reliability and reducing reliance on local autonomous power stations under N-1 conditions.
2020Cable Installation Complete
In early 2020, the upgrade of the submarine interconnections between Andros and Livadi (southern Evia) and between Andros and Tinos was completed, replacing the existing oil-filled cables with new 150 kV XLPE AC submarine cables rated at 200 MVA over lengths of approximately 14.5 km and 4 km respectively, implemented in parallel with Phase B of the Cyclades interconnection.
30 Sept 2019Capital Support Awarded
By September 2019, the EU had awarded capital support to the Interconnection of Cyclades Islands project, which includes Phase B works such as the Andros–Tinos–Naxos reinforcement. The total investment for the multi-phase Cyclades interconnection is EUR 389.06 million, of which EUR 138.18 million is provided as grants from the European Regional Development Fund through Greece’s “Competitiveness, Entrepreneurship” and “Competitiveness, Entrepreneurship and Innovation” operational programmes. IPTO further reports that within this framework the Phase B works have a budget of EUR 47.3 million and the upgrade of the Andros–Livadi (South Evia) and Andros–Tinos cable connections has a budget of EUR 22.2 million, both co‑financed by the European Union and the NSRF 2014–2020, directly supporting the Andros–Tinos–Naxos Phase B segment.
€138.176M (grant)
Aug 2018Cable Supplier Selected
In 2018, IPTO completed the tender for upgrading the Euboea–Andros and Andros–Tinos interconnections and signed a contract with Prysmian to supply and install new 150 kV AC submarine cables with a nominal capacity of 200 MVA, replacing the existing oil-filled cables as part of Cyclades Interconnection Phase B and the reinforcement of the Andros–Tinos link.
1 Jan 2018Onshore Construction Start
In 2018, IPTO began construction works for Phase B of the Cyclades Interconnection, which includes the Cyclades Interconnection Phase B Andros - Tinos - Naxos project. The works comprise construction of the 150 kV GIS substation on Naxos, laying of submarine cables connecting Naxos with Paros and Mykonos, and installation of new higher-capacity 200 MVA transmission lines at the Evia–Andros and Andros–Tinos interconnections, under a €72 million programme scheduled for completion by the end of 2019.
Nov 2006Regulatory Other
Licence: Designation as project of greater general importance for the country’s economy
By a Greek ministerial decision in November 2006, the Cyclades Interconnection project – which includes the reinforcement of the Andros–Tinos link and thus the Phase B Andros–Tinos–Naxos works – was designated a project of "greater general importance for the country’s economy," formally recognizing its strategic significance for improving supply reliability and reducing generation costs on the interconnected islands.
2005Early Development Other
In 2005 a working group including representatives from DESMIE, PPC and RAE completed a study whose conclusions formed the basis for planning the Cyclades Interconnection project, which covers the interconnection of Syros, Mykonos, Paros and Naxos to HETS and the reinforcement of the Andros–Tinos link. This planning phase focused on minimising environmental impacts by siting new substations close to the coast and using submarine cable connections between the islands and the mainland system.
Date TBDCable Installation Start
The second phase of the Cyclades submarine interconnection entered its final stage, with Prysmian scheduled to begin installation of the upgraded high-voltage cable systems on the Evia–Andros and Andros–Tinos links the following week under a contract with Greek transmission operator IPTO, covering about €21 million of upgrade works to increase capacity on these segments.
Date TBDCommercial Operations Full Power
IPTO/ADMIE placed the submarine interconnection on the Andros–Tinos section into full operation, providing a double supply circuit for Andros and enhancing the security of its electricity supply. The operator notes that the subsea Andros–Tinos link entered full service a few days before the article, following earlier electrification of the cable between Andros and the mainland system (Evia).