Grant Thornton

Greek power transmission operator IPTO (ADMIE) commissioned international advisory firm Grant Thornton to undertake the pre-feasibility cost-benefit analysis for the proposed Green Aegean Interconnector, a high-capacity HVDC corridor planned to transport surplus renewable electricity from Greece to southern Germany via the Adriatic, Slovenia and Austria. The engagement, publicly disclosed by IPTO chairman Manos Manousakis on 24 January 2024 at the 28th Energy + Development Conference, made Grant Thornton the canonical commercial-viability advisor underpinning IPTO's TYNDP 2024 submission. The study is structured around four evaluation criteria: the reduction of operational costs and electricity-price volatility with and without the interconnection; the percentage of CO2 emissions avoided through cross-border green-power transfer; the percentage reduction in renewables curtailment across the participating systems; and the impact on redistribution costs, with particular focus on enabling green electricity injection into southern Germany. Preliminary findings, presented at industry conferences in late 2024, indicated the project appears viable under specified conditions and assumptions. Initial results targeted a final report around mid-December 2024, after which discussions with the transmission operators of Austria (APG), Slovenia (ELES) and Germany (TenneT) were to resume in 2025 to refine route options and project structure. As of March 2025, Grant Thornton's work remained the primary commercial-viability input cited in IPTO's public communications around the project.