Great Sea Interconnector Powers Island Tourism Future With Energy Security and Sustainable Growth Across the Mediterranean

Written By: Shreya Saha

Shreya Saha

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August 22, 2026 13:18 GMT+5:30

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It seems that the Great Sea Interconnector is developing into an innovative energy project which may influence the future of Mediterranean island destinations due to its contribution to increased power security and sustainable growth of tourism industry. Island destinations, having always been vulnerable due to low energy sources and external dependencies on power supplies, have an opportunity to become more resilient because of improved connection to electricity grids. The importance of reliable electricity supply is increasing since tourism hubs continue growing and implementing new green technologies and facilities.

EXECUTIVE SUMMARY & THE EXPERT PERSPECTIVE

Poullikkas’ Energy Hub Vision for Islands

The traditional energy profile of island destinations across Southern and Insular Europe has long been defined by geographic isolation, heavy reliance on imported fossil fuels, and structural exposure to global market volatility. For decades, island power grids operated as closed, autonomous systems. To meet domestic demand, local utilities relied on localized thermal power plants fueled by heavy fuel oil (HFO) or diesel. This isolated operational model created a direct link between volatile global commodity prices and domestic retail electricity tariffs, imposing a heavy economic burden on commercial energy consumers, particularly within the hospitality and leisure sectors.

Energy systems authority and former Chairman of the Cyprus Energy Regulatory Authority (CERA), Dr. Andreas Poullikkas, has articulated a framework for overcoming this structural vulnerability. Dr. Poullikkas emphasizes that public and corporate evaluations of cross-border subsea energy infrastructure—most notably the Great Sea Interconnector—must move beyond narrow assessments of upfront capital expenditure to examine total socio-economic net surplus and long-term energy resilience.

Under the European Union energy market framework, specifically EU Regulation 2019/943, the financial architecture of cross-border high-voltage direct current (HVDC) interconnectors does not directly transfer total construction costs onto end-user utility bills. Instead, capital expenditure recovery is structured through Cross-Border Cost Allocation (CBCA) mechanisms, co-funding grants from the EU Connecting Europe Facility (CEF), and the collection of congestion rents generated by cross-border electricity trading.

By decoupling initial capital expenditure from end-user tariffs, subsea interconnectors operate as strategic economic infrastructure. They allow isolated island nations to shift from high-cost energy importers into interconnected, regional energy trading hubs. For coastal resort clusters and hospitality asset owners, this structural evolution delivers lower baseline tariffs, eliminates peak-season blackouts, and provides the transmission capacity required to absorb large-scale solar and wind generation without risking local grid collapse.

The economic vulnerability of energy-isolated island resorts.

The commercial performance of resort portfolios on non-interconnected islands is exposed to severe grid instability and elevated operational costs. Unlike mainland hospitality properties connected to broad, multi-national synchronous power systems, island resorts depend on small, isolated micro-grids. During peak summer months, these isolated grids experience extreme demand spikes driven by high visitor occupancy, continuous air conditioning (HVAC) cooling loads, energy-intensive seawater desalination operations, and commercial kitchen facilities.

When an island grid operates autonomously, sudden load fluctuations or localized generator trips can trigger rapid frequency deviations. To prevent widespread system blackouts, grid operators must maintain expensive fossil-fuel units running in continuous spinning reserve mode. Additionally, during periods of low off-peak demand, operators frequently curtail local solar photovoltaic generation to protect grid balance, throwing away clean power that the isolated system cannot safely absorb.

This operational environment places heavy financial burdens on hospitality operators. High hotel operational energy costs erode operating margins, while power quality fluctuations force luxury properties to invest heavily in back-up diesel generators and uninterruptible power supply (UPS) systems. Subsea interconnectors eliminate these operational vulnerabilities by linking island micro-grids directly to continental energy markets.

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THE GREAT SEA INTERCONNECTOR (GSI) & CYPRUS

Ending electrical isolation: What the Crete-Cyprus connection changes for resort operators.

Cyprus remains the last non-interconnected EU member state, operating its power grid in complete isolation from mainland Europe. This lack of grid connectivity leaves the island’s domestic economy reliant on local oil-fired generation, resulting in significantly higher power costs than those on the European mainland. The Great Sea Interconnector (GSI)—previously known as the EuroAsia Interconnector—is a priority European Project of Common Interest (PCI 2.6) designed to permanently bridge this infrastructure gap.

Developed by Independent Power Transmission Operator (IPTO/ADMIE) S.A. through the special purpose vehicle Great Sea Interconnector S.A., this subsea transmission line links the electricity networks of Greece (via Crete), Cyprus, and Israel. The project comprises an 898-kilometre subsea link between Crete and Cyprus, and a secondary 310-kilometre link connecting Cyprus to Israel, yielding a total length of 1,208 kilometres. Laid at sea depths reaching 3,000 metres in the Levantine Basin, the GSI represents one of the longest and deepest subsea high-voltage direct current projects in global energy history.

For resort operators across Paphos, Limassol, Larnaca, and Ayia Napa, ending electrical isolation provides a critical operational foundation. Direct grid connection to mainland Europe ensures access to reliable power, removing the risk of voltage sags or forced load shedding during peak tourist seasons.

Stabilising summer peak-load demand and lowering operational energy tariffs.

The seasonal tourism cycle in Cyprus generates severe swings in national energy consumption. During winter, electricity demand remains modest. However, the arrival of summer brings high ambient temperatures, full hotel occupancies, and maximum cooling loads, driving power demand to annual peaks that test local generation capacity.

To cover these summer load surges, domestic utilities must dispatch high-cost oil-fired peaking units. This reliance inflates wholesale market prices and subjects commercial hospitality businesses to high seasonal tariff surcharges. The Great Sea Interconnector addresses this seasonal challenge by enabling bidirectional power transfers between regional energy markets.

During peak summer afternoons when local air conditioning and desalination demand is highest, Cyprus can import competitively priced base-load power directly from mainland European energy markets. Conversely, during spring and autumn when local demand drops but solar generation remains high, Cyprus can export surplus solar power back to the European grid.

Former CERA Chairman Dr. Andreas Poullikkas notes that the total social benefit generated for Cyprus by lower electricity tariffs and reduced reserve costs is estimated at €8 billion over the project lifecycle. This structural reduction in energy expenditure provides direct operational relief to hotel profit and loss statements, converting utility overhead from a volatile variable cost into a stable, manageable expense.

Paving the way for green certifications and decarbonised luxury travel.

International tour operators, institutional travel buyers, and luxury guests increasingly prioritize documented environmental sustainability. Major hotel groups operating across Europe face strict corporate carbon reporting requirements under the EU Corporate Sustainability Reporting Directive (CSRD) and RE100 commitments. These frameworks require accurate tracking and reduction of indirect greenhouse gas emissions from purchased electricity, known as Scope 2 emissions.

On an isolated island grid, individual resort properties cannot easily reduce their Scope 2 carbon footprint. Even when resorts install on-site solar photovoltaic panels, local grid limits prevent complete off-grid self-sufficiency or full net-metering export. As a result, properties remain dependent on fossil-fuel generation for nighttime power and peak demand support.

The GSI resolves this constraint by integrating the island network into the broader European power system, enabling high levels of renewable energy penetration. With the subsea cable providing dynamic system balancing, local solar arrays no longer face severe grid curtailment. Hospitality businesses can enter into corporate Power Purchase Agreements (PPAs) supported by European Guarantees of Origin (GoOs). This connectivity enables resort portfolios in Cyprus to earn recognized green building certifications, improve corporate ESG scores, and meet growing demand for decarbonised luxury travel.

LESSONS FROM EUROPE: MALTA, CRETE, AND THE CYCLADES

Malta-Sicily Interconnector 2: Supporting high-density urban and coastal resort grids.

Malta provides a clear demonstration of how subsea power links can transform an island hospitality economy. As one of the most densely populated nations in Europe, Malta experiences heavy visitor concentration along its northern coastline, particularly around the urban resort districts of St. Julian’s, Sliema, and the capital, Valletta.

Historically, Malta depended entirely on localized oil-fired power plants located near urban waterfronts and commercial harbors. The commissioning of the first Malta-Sicily Interconnector (IC1)—a 200 MW HVDC link connecting Magħtab, Malta, to Ragusa, Sicily—marked the beginning of a fundamental energy transition. Access to Italian and European wholesale electricity markets allowed state utility Enemalta to permanently decommission and dismantle the heavy-fuel-oil Marsa Power Station along the Grand Harbour.

The removal of Marsa improved air quality across nearby resort zones and unlocked high-value waterfront land for urban regeneration and hospitality development.

To support growing demand from tourism and transport electrification, Enemalta is advancing the Second Malta-Sicily Interconnector (IC2) project. Backed by a €100 million loan facility from the European Investment Bank (EIB), IC2 will deploy a second 180 MW subsea cable alongside IC1. This investment doubles Malta’s cross-border transmission capacity, delivering the grid stability needed to power expanding urban hotel clusters, luxury marinas, and commercial infrastructure without re-commissioning thermal power plants.

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The Cyclades Subsea Grid: Eliminating diesel generator dependence in Santorini & Mykonos.

Greece’s Aegean islands, particularly the Cyclades archipelago, demonstrate the operational benefits of replacing local island generators with subsea transmission cables. Major luxury tourism destinations like Mykonos, Santorini (Thira), Paros, and Syros historically relied on autonomous diesel power stations located directly on the islands.

During peak summer months, visitor populations on Santorini and Mykonos increase dramatically compared to baseline winter levels. In the past, these summer surges regularly overwhelmed local diesel power plants. Resorts experienced frequent voltage drops, brownouts, and rolling blackouts during peak evening hours. To protect guest operations, luxury hotels were forced to run large backup diesel generators. This setup created local air and noise pollution while consuming land that could otherwise be used for guest amenities or leisure space.

To resolve these systemic challenges, Greek transmission operator IPTO (ADMIE) executed the multi-phase Cyclades Interconnection project. This project uses high-voltage subsea cables to connect the island grids in a closed loop linked directly to the mainland Greek transmission system via substations in Lavrio and Naxos.

The expansion across the Cyclades was rolled out in four distinct phases:

• Phases A & B: Interconnected Syros, Paros, and Mykonos using subsea cables and compact Gas-Insulated Switchgear (GIS) substations, replacing local base-load diesel plants.
• Phase C: Integrated Naxos into the grid, reinforcing inter-island energy transfers and improving overall network stability.
• Phase D: Completed the subsea loop by connecting the southern Cyclades—including Santorini, Folegandros, Milos, and Serifos—via approximately 350 kilometres of subsea and underground cables.

Completing this subsea network enabled the full retirement of expensive diesel power plants across the Cyclades. Resorts now draw quiet, stable electricity from the mainland grid. This transition eliminated localized exhaust fumes and generator noise, lowered regional power tariffs, and freed up prime coastal land previously required for fuel storage tanks and power stations.

The Celtic Interconnector: Broadening energy resilience across Atlantic island corridors.

While Mediterranean islands experience extreme summer heatwaves and high cooling demand, Atlantic island destinations face winter heating demand, maritime weather exposure, and grid isolation. Ireland represents an island energy market working to manage growth in commercial power demand while expanding its renewable generation capacity.

To enhance energy security and align with European climate targets, Irish transmission operator EirGrid partnered with France’s Réseau de Transport d’Électricité (RTE) to construct the Celtic Interconnector. The Celtic Interconnector is a 700 MW VSC-HVDC subsea link spanning 575 kilometres (including 500 kilometres under the Celtic Sea) between Knockraha in County Cork, Ireland, and La Martyre in Brittany, France. Supported by €530.7 million in grant funding from the EU Connecting Europe Facility (CEF), the €1.6 billion project creates Ireland’s first direct energy transmission link to continental Europe.

For coastal tourism corridors across Ireland, particularly eco-resorts and hospitality businesses along the Wild Atlantic Way and southern coast, the Celtic Interconnector delivers substantial long-term benefits. Ireland generates significant wind power, but during periods of low wind, the island grid historically experienced tight capacity margins and high marginal power prices. Direct interconnection with France allows Ireland to import clean, reliable base-load power during low-wind periods and export excess wind energy during high-wind events. This bidirectional flow stabilizes power prices for commercial consumers and secures grid reliability across the hospitality sector.

THE COMMERCIAL REASONING FOR HOSPITALITY INVESTORS

Impact on hotel EBITDA: Reducing utility price volatility.

From an asset management perspective, energy overhead represents one of the largest controllable operational expenses on a hotel income statement. On non-interconnected islands, volatile fuel surcharges can rapidly erode gross operating profit (GOP) and earnings before interest, taxes, depreciation, and amortization (EBITDA).

Connecting an island grid to a continental transmission network shifts commercial utility pricing from a high, volatile structure to a lower, predictable cost model. Access to broad wholesale electricity markets dampens sudden price spikes, allowing resort operators to budget utility expenses accurately.

For luxury resort properties operating at high occupancies, reducing energy overhead from 18% down to 9% of total OPEX flows directly to bottom-line profitability. This reduction expands EBITDA margins, increases net operating income (NOI), and enhances property valuations for institutional real estate investors.

ESG compliance: How clean imported/exported power helps hotel groups meet EU sustainability standards.

Institutional capital flows in European commercial real estate are increasingly governed by Environmental, Social, and Governance (ESG) criteria. Under frameworks such as the EU Taxonomy for Sustainable Activities, the Sustainable Finance Disclosure Regulation (SFDR), and GRESB real estate benchmarks, institutional investors must report verified operational emissions data across their portfolios.

For hotel assets located on non-interconnected islands, achieving high ESG compliance scores is difficult due to the high carbon intensity of localized fossil-fuel grids. Even properties with modern efficiency upgrades remain penalized by the high Scope 2 emissions factor of the surrounding municipal grid.

Subsea interconnectors solve this structural ESG challenge. By linking island networks to continental transmission grids, interconnectors lower the overall carbon intensity of the municipal electricity supply. Furthermore, they allow resort owners to purchase certified green energy via corporate PPAs and Guarantees of Origin (GoOs). This access helps properties secure recognized international green building certifications (such as LEED, BREEAM, or EarthCheck), satisfy institutional investment mandates, and access low-cost sustainability-linked credit facilities.

Infrastructure resilience: Protecting destination reputation against peak-season blackouts.

In luxury hospitality, operational continuity is fundamental to brand value. A single power outage during peak season can disrupt essential guest services, shutting down air conditioning systems, fine dining kitchens, and water treatment facilities. Beyond immediate operational headaches, blackouts lead to compensation claims, negative online reviews, and long-term reputation damage for the destination.

Subsea interconnectors provide the high-capacity, multi-directional transmission links required to backstop island power systems. By giving local TSOs access to continental spinning reserves, subsea cables absorb sudden load spikes and maintain stable grid frequency. This reliability protects resort infrastructure, guarantees guest comfort, and preserves the premium reputation of European island destinations.

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STRATEGIC OUTLOOK

Transforming isolated Mediterranean islands into net-exporter energy hubs.

The expansion of Europe’s subsea energy network is driving a structural shift in how island economies function. Historically forced to import fossil fuels, Mediterranean islands are positioning themselves to become major net exporters of clean energy.

Islands like Cyprus and Crete possess abundant solar radiation and offshore wind potential. Without subsea links, these clean energy resources remain constrained by local demand limits, leading to frequent curtailment. High-capacity HVDC interconnectors remove these bottlenecks, unlocking large-scale renewable development.

With high-capacity subsea cables operational, islands can generate clean power locally, supply their domestic hospitality sectors, and export excess electricity to continental European demand centers. This transition creates a sustainable economic model that turns regional energy security into a long-term economic driver.

How regional energy security drives long-term capital investment in European hospitality.

The integration of Europe’s island power grids marks a fundamental shift in how institutional investors evaluate offshore hospitality assets. As subsea transmission links come online across the Mediterranean and Atlantic corridors, they remove a key operational risk factor: energy isolation.

Securing reliable access to continental energy networks lowers utility price volatility, cuts property-level carbon footprints, and ensures operational continuity for luxury resorts. In turn, these infrastructure improvements drive long-term capital investment into island hospitality markets. Modern subsea energy interconnectors provide the physical foundation required to build resilient, sustainable, and profitable luxury tourism destinations across Europe.

Subsea interconnectors are fundamentally redefining the economic and environmental future of island tourism destinations across Europe. By linking previously isolated power systems to continental transmission networks, projects like the Great Sea Interconnector, Celtic Interconnector, and Cyclades subsea grid replace expensive fossil generation with reliable, clean electricity. For resort operators and hospitality investors, subsea interconnectors island tourism infrastructure integration stabilizes operational expenditure, mitigates summer peak load risks, and guarantees compliance with European sustainability standards. Ultimately, transforming island grids into interconnected energy hubs ensures long term destination competitiveness while securing a low carbon horizon for European luxury resort hospitality market growth.

Conclusion

However, The Great Sea Interconnector is not just about energy; it is a representation of a strategic plan for making island destinations even more prosperous in the future. The improvements in energy management and distribution that this project will bring will give the tourism centers a chance to deal with their growth in the sustainable way. When competing for foreign tourists, the island destinations will have reliable energy systems, which will be crucial for development, transportation, and hospitality of the place.