Greece: The islands that can become capital

This article is part of In conversation about sustainable finance & emission reduction systems, a new series by Diego Balverde. You're reading volume 7 of the Europe country by country: the financial risk map series. Here is volume 6

Prologue

Greece is no longer the country Europe watches only through bailouts, sovereign spreads, damaged banks and debt that markets once considered impossible to refinance. After more than a decade of adjustment, reforms, declining non-performing exposures, fiscal discipline and recovering investment, the country has entered a different stage: stability can no longer be the final objective and must become a productive platform. The economy grew by 2.1% in 2025, public debt continues to decline from levels above 200% of GDP during the pandemic and the European Commission expects it to reach roughly 134.4% by 2027. Unemployment continues to fall and banks occupy a radically stronger position than the one that defined the previous crisis. Yet recovery still coexists with a large external deficit, insufficient productivity, demographic ageing, energy exposure, climate pressure, tourism concentration and an investment cycle that has benefited from extraordinary NextGenerationEU support that will progressively disappear. Greece has already proved it can survive collapse. It must now prove that it can build an economy capable of growing after the exceptional capital that helped reconstruct it begins to recede.

The opportunity I find is not simply further debt reduction. It is using Greek geography as a productive balance sheet. Greece possesses hundreds of inhabited islands, one of the world's most important shipping ecosystems, strategic Mediterranean corridors, ports connected with Asia, the Middle East, the Balkans and Central Europe, a tourism industry that generated €23.6268 billion of receipts in 2025, abundant wind and solar resources, future storage capacity, energy infrastructure, construction capabilities, cultural assets and a geopolitical position that becomes more valuable whenever traditional trade routes fragment. The problem is that too many of these assets still operate as separate sectors. Tourism on one side, shipping on another, energy elsewhere, water as a municipal problem, ports as infrastructure, hotels as real estate and islands as seasonal destinations. The next leap is to integrate them and turn them into assets capable of producing verifiable year-round yield.

Debt after the crisis

The decline in Greek public debt is one of the most important financial reversals in Europe since the euro crisis. The ratio fell to around 146% of GDP in 2025 and European projections place it near 134% in 2027, while the state continues to generate budget surpluses and the IMF highlights a strong primary fiscal position. This trajectory reduces sovereign risk, but it does not remove the need to transform the productive structure because Greece cannot depend indefinitely on fiscal surpluses, tourism and European disbursements to improve its financial position. The real test begins after 2027, when the extraordinary RRF contribution declines and growth becomes more directly dependent on domestic productivity, private investment and the ability to export higher-value goods and services. The Commission expects growth to moderate from 1.8% in 2026 to 1.6% in 2027, while the IMF sees medium-term growth settling near 1.5% if the working-age population declines and productivity remains sluggish.

That turns the current investment window into a race against time. Greece must use European resources not to extend the cycle artificially, but to leave behind assets capable of financing the next one. Tax administration reform has already improved revenue and fiscal discipline, but the next stage cannot rely only on collecting better. Greece must produce more. Debt reduction needs to be accompanied by a reduction in operating losses that still weigh on the economy: expensive electricity in island systems, fuel dependence, energy-intensive tourism buildings, water networks under seasonal stress, ports capable of capturing more logistics value, coastal infrastructure exposed to climate risk and regions that receive millions of visitors for a few months while losing productive population during the rest of the year.

Another signal should not be ignored. The current-account deficit remains large and the Commission expects it at approximately 7.1% of GDP in 2026. Greece generates enormous service revenues, particularly through tourism and shipping, but imports significant amounts of energy, equipment, industrial goods and investment-related components. This means that part of the growth financed by European capital leaves again through imports. The decisive improvement will come from increasing how much value remains inside Greece for every euro invested, every visitor received, every ship serviced, every megawatt generated and every infrastructure asset built. That is where the next stage of risk reduction begins.

The sea as a balance sheet

Tourism offers the clearest demonstration of both the strength and limitations of the model. Travel receipts reached €23.6268 billion in 2025, increased by 9.4% from 2024 and inbound traveller flows rose by 6.4%. Between January and May 2026, receipts increased another 25.8% while arrivals rose 20.9%. These are extraordinary numbers for an economy of Greece's size, but the next objective should not simply be receiving more people. Every additional visitor consumes airport capacity, ferries, roads, housing, energy, water, waste infrastructure, healthcare services and urban space. In destinations where infrastructure is already under pressure, higher volume can raise revenues while simultaneously reducing the future value of the asset. The more relevant indicator should become the net value generated by each visitor after water, energy, congestion, housing, waste, labour and infrastructure costs are considered.

This creates an opportunity much larger than conventional tourism expansion. Greece can turn its islands into laboratories of financial self-sufficiency. A tourism island can integrate solar and wind generation, BESS, efficient desalination, water reuse, waste treatment, port electrification, next-generation ferries, efficient hotels, electric mobility and digital capacity management. The result stops being an environmental policy and becomes cost reduction. If an island imports less fuel, loses less water, reduces electricity peaks, improves hotel occupancy outside summer and uses its ports more efficiently, the system produces more cash flow from the same geography. That improvement can be measured and structured.

Shipping expands this opportunity. Greece does not need to create a maritime industry from nothing. It already possesses capital, shipowners, professionals, ports, shipyards and deep commercial knowledge linked to the sea. The global transition toward different marine fuels, energy efficiency, route optimisation, port electrification, digital systems, new propulsion technologies and emissions management opens another investment cycle that can retain more activity around the Greek ecosystem. The risk is that the Greek-linked fleet transforms technologically using almost entirely equipment, software, fuels and finance developed elsewhere. The opportunity is for a growing share of that transition to be produced around Piraeus, Elefsina, Syros, Thessaloniki and other industrial and port nodes through maintenance, engineering, software, batteries, components, retrofits and specialised financial services.

Productive islands

The situation can improve in a way few European economies can replicate: Greece can stop treating its islands primarily as expensive territories to supply and begin treating them as productive units capable of generating data, savings, technology and yield. Every island has a different combination of tourism, water, energy, transport, housing and waste. That fragmentation historically increased costs, but it can now become an advantage because projects can be bounded, measured precisely and replicated across dozens of territories. A microgrid on one island, a storage system, a water-reuse plant or a portfolio of retrofitted hotels can demonstrate results quickly. Once those projects are aggregated, they stop being small experiments and become portfolios.

The first market I see is the integration of energy and water. Desalination, pumping, hotel cooling and island transport consume large amounts of energy precisely during the months of highest tourism demand. Combining renewables, storage, intelligent demand management and reuse can weaken that correlation. The second market is hotel and tourism-building retrofits. Greece can create portfolios containing hundreds of assets where financing is partly repaid through energy savings, water savings, improved occupancy and stronger property values. The third is ferries and ports. Island connectivity will inevitably move toward more efficient engines, alternative fuels, partial electrification and digital optimisation. The fourth is extending the tourism season through health, sport, sailing, culture, gastronomy, remote work and higher-value travel, reducing dependence on a few weeks of maximum occupancy.

There is also a capital market Greece can develop much further: turning maritime and tourism assets into investment instruments linked to operating performance. Instead of financing one hotel, one port or one energy plant separately, Greece can aggregate savings and improvements across multiple assets. A portfolio of twenty hotels can generate a verifiable stream of energy savings. Ten islands can share a water and storage platform. Several ports can operate under common efficiency standards. Shipping companies can combine retrofit, fuel and finance. Island municipalities can place public buildings, lighting, water, waste and energy inside the same package. This creates sufficient scale for institutional investors that would normally ignore small individual projects.

Blue capital

The practical proposition is to turn the Greek archipelago and its maritime corridors into a platform of verifiable assets. DOIX can begin by measuring losses that are currently dispersed: kWh consumed per hotel room, litres of water per visitor, grid losses, desalination costs, ferry fuel consumption, port waiting hours, berth utilisation, seasonal occupancy, inefficient public buildings, waste per tourist, island transport costs, curtailed energy and the value of assets exposed to heat, wildfire or coastal erosion. These data allow Greece to move beyond the generic category of sustainability and work directly on money being lost.

BalGreen can then structure differentiated packages without forcing one universal model. An Aegean Island Performance Package can integrate energy, storage, water, hotels and mobility; a Maritime Retrofit Package can combine vessel efficiency, software, maintenance, batteries, new fuels and financing; a Port Revenue Package can address throughput, electrification, cruises, ferries, logistics and rail connectivity; a Tourism Asset Upgrade Package can aggregate hotels and buildings requiring retrofits; and a Coastal Resilience Package can protect real estate, marinas, ports and municipalities from heat, wildfire, flooding and water pressure. The objective is not to create more projects carrying green labels. It is to demonstrate that each intervention creates savings, raises revenue, reduces risk or protects collateral.

Once DOIX verifies that difference, the financial asset appears. If a hotel portfolio reduces energy use by 25%, there is a measurable saving. If an island reduces water losses and desalination costs, there is a measurable saving. If a port reduces dwell time, increases throughput or improves electrification, there is operating yield. If a ferry reduces consumption per passenger-mile, margins improve. If a municipality reduces energy expenditure, fiscal capacity increases. These flows can be structured through tourism efficiency facilities, island resilience notes, port performance vehicles, maritime retrofit funds, municipal credit pools or asset-backed structures linked to identifiable assets. Investors do not buy a declaration about Greece's sustainable future. They buy an improvement DOIX can prove.

The potential capital pool is wide. The EIB and EBRD can participate in infrastructure, energy and early-stage risk; institutions such as Brookfield, Macquarie, BlackRock, KKR, Allianz Global Investors, GIC, ADIA, CPP Investments and major insurers can evaluate portfolios once sufficient scale, verifiable cash flow and governance exist. Greek banks can also perform a role fundamentally different from the one they played in the previous crisis: instead of being the main transmission channel of fragility, they can originate portfolios of improved assets, finance tourism SMEs, hotels, shipping and municipalities and later distribute part of that risk into capital markets. Greece's opportunity is precisely to connect renewed banking stability with modernisation of the physical assets that support the economy.

Analysis

Greece is approaching the end of an exceptional stage. It restored fiscal credibility, reduced public debt, repaired much of its banking system and absorbed extraordinary European capital. Tourism continues to set records, maritime services retain global importance and the economy is still expanding faster than many thought possible a decade ago. The next phase will be more demanding because the RRF will fade, the working-age population will continue to decline, energy will remain exposed to geopolitical shocks and tourism cannot expand indefinitely using the same infrastructure. The risk is not an automatic return to 2010. The risk is becoming a stable but low-growth economy where debt and unemployment decline while productivity and value added advance too slowly.

The opportunities I find point in another direction. Greece possesses something many countries would spend decades trying to build: a global tourism brand, an island network, maritime culture, strategic ports, functioning banks, euro access and a territorial laboratory where energy, water, mobility, tourism and shipping can be integrated. If it uses this combination correctly, Greece can move from selling hotel nights, maritime transport and scenery toward selling complete systems of island efficiency, destination management, maritime technology and financeable blue assets. The knowledge developed to make one Aegean island efficient can later be exported to islands across the Mediterranean, Caribbean, Pacific or Indian Ocean. Greece can begin by solving a domestic limitation and end by creating an international specialisation.

Conclusion

The next Greek transformation will not be determined only by how far public debt continues to decline. Between 2026 and the end of the decade, it will become clear whether the extraordinary resources deployed after the pandemic left behind a structurally more productive economy or simply accelerated a recovery that later returns to slower growth. My reading is that the decisive inflection point will be found in the sea and the islands. Tourism will continue producing record numbers, but markets will increasingly reward value per visitor rather than pure volume; island systems will require storage, water, electrification and efficiency; ships will need technological transformation; ports will acquire greater geopolitical and energy value; and banks will be able to finance assets much stronger than those that defined the previous crisis.

If Greece connects those movements, markets will gradually stop reading the country primarily as Europe's great debt-recovery case and begin valuing it as a Mediterranean blue-capital platform. Islands can become portfolios of energy, water, mobility and tourism; ports can become logistics and energy assets; shipping can create permanent demand for technology and retrofit; and hotels can become portfolios of verifiable savings. That is the possibility I leave to the reader: watch the moment when Greece stops monetising geography alone and begins financing the efficiency of that geography. If it happens, the most interesting Greek asset of the next cycle will not be another sovereign issuance. It will be the measurable yield generated by systems the country already owns.

illuminem Voices is a democratic space presenting the opinions of leading Sustainability Thought Leaders, their views do not necessarily represent those of illuminem.

The world needs sustainability knowledge. At illuminem, no interest group or shareholder can influence our work. Thank you for supporting our mission to make high-quality and independent sustainability information free for all. Every contribution helps. Thank you for donating today.