Greece has secured approval for a €2.3 billion programme to decarbonise its islands, directing more than €2 billion towards electricity interconnections, renewable generation and storage as Athens accelerates the replacement of oil-fired power.
The programme, approved with the European Commission and European Investment Bank, allocates about €1.1 billion to electricity interconnections and related infrastructure across the Dodecanese, Cyclades and North Aegean.
A further €977 million is earmarked for renewable-energy projects combined with storage, while €200 million will support multipurpose dams and reservoirs and €56 million will fund electric-vehicle charging infrastructure.
The scale of the grid component makes the programme more significant than a conventional renewable-support package.
Many Greek islands have historically relied on isolated electricity systems supplied largely by expensive oil-fired generation. Connecting them to the mainland network allows cheaper generation to reach the islands while creating new outlets for local wind and solar production.
It can also reduce the need to maintain thermal generation solely for security of supply.
The investment programme therefore addresses two of the main constraints on Greek island decarbonisation: insufficient transmission capacity and the inability of small isolated systems to absorb large volumes of intermittent renewable generation.
Storage will become increasingly important as more solar and wind capacity is connected.
Batteries and other flexible assets can absorb surplus production during high-renewable periods and release electricity when generation falls, reducing curtailment and limiting dependence on fossil backup.
The strategy also strengthens Greece’s broader role in Southeast Europe’s electricity transition.
The country is rapidly expanding solar and wind generation while investing in domestic transmission and cross-border links. Island interconnections extend that process into systems that have traditionally operated at the edge of the continental market.
Projects across the Cyclades have already demonstrated how interconnection can reduce reliance on local oil generation. Extending the model towards the Dodecanese and North Aegean would bring a larger share of island demand into the interconnected market.
For renewable developers, the programme could open areas where generation potential has previously been constrained by weak networks.
But the value of future projects will depend increasingly on the combination of generation, storage and connection capacity rather than installed renewable megawatts alone.
The programme also includes investment in water infrastructure, creating potential links between energy management, water supply and climate resilience on islands where both electricity and water demand rise sharply during the tourism season.
Available funding is currently estimated at around €2 billion, with the final amount partly dependent on the value of EU carbon allowances.
That introduces some funding-price exposure but does not change the programme’s strategic direction.
Greece is moving from subsidising isolated renewable assets towards financing the infrastructure needed to operate a much more integrated island power system.
The €2.3 billion programme puts transmission and storage at the centre of that shift.
