The Green Aegean Interconnector is a proposed long-distance electricity corridor promoted by Greece’s transmission system operator (IPTO/ADMIE) to export renewable energy from Greece and the Eastern Mediterranean to major consumption centers in Central Europe, notably southern Germany. Strategica...
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By early March 2025, reports on the Green Aegean Interconnector, a planned HVDC link from Greece to southern Germany via the Adriatic Sea, indicated an updated project budget of about EUR 8.1 billion based on a subsea route from Greece to Slovenia and an overland extension through Austria to Munich. Earlier pre-feasibility work led by Grant Thornton for Greek TSO IPTO had cited a budget of at least EUR 8 billion potentially rising to roughly EUR 12–14 billion depending on design, while preliminary multinational studies submitted to ENTSO-E had placed the cost in the EUR 7–8 billion range; the 8.1‑billion‑euro figure reflects more refined cost estimation as the project’s configuration and route are clarified.
On 7 March 2025, To Vima reported a significant revival of the Green Aegean Interconnector following the German elections, with the project re‑entering Germany’s investment agenda and Austrian construction group Strabag emerging as leader on the German side. The article noted that, alongside Greek TSO IPTO, major Greek business groups were in preliminary discussions to participate, while a feasibility study led by Grant Thornton on behalf of IPTO was under way; the interconnector, budgeted at about EUR 8.1 billion, was targeting completion in late 2035.
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Green Aegean, GAI, Greece–Germany interconnection, Greece-Germany electrical interconnection
In February 2024, the Green Aegean Interconnector was included by ENTSO-E (the European Network of Transmission System Operators for Electricity) in its 2024 Development Procedural Plan. This designation, recorded after Greece proposed the project as a major north–south green power corridor, confirms ENTSO-E’s formal recognition of the interconnector in its planning framework and sets out a preferred offshore corridor through the Adriatic and the exclusive economic zones of Albania, Montenegro, Croatia and Slovenia before reaching Austria and southern Germany. The inclusion marks a key step in the project’s maturation at European level, supporting subsequent technical and cost-benefit studies by the participating TSOs.
By 24 January 2024, Greek power grid operator IPTO had commissioned Grant Thornton to conduct a pre‑feasibility study for the Green Aegean Interconnector, and initial findings presented at the 28th Energy + Development Conference indicated the project appears viable under certain conditions and assumptions. Grant Thornton’s Nikos Frydas said the ongoing study, undertaken on behalf of IPTO, would deliver final results around mid‑December, providing detailed figures on the project’s viability, technical specifications and potential advantages for Greece and Germany.
On 4 November 2022, Greek media reported that Greece, through transmission operator IPTO, had proposed the Green Aegean Interconnector, a new high‑capacity cable corridor to carry renewable electricity from Greece to Austria and southern Germany. Greek officials indicated an initial transmission capacity of 3 GW, upgradable to 9 GW, with route options running via Albania, then through Montenegro, Croatia and Slovenia to Austria and southern Germany, or alternatively via a subsea link from Albania to Slovenia before continuing north, positioning the scheme as a major north–south green power corridor in Europe.
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