The energy landscape in Southeast Europe (SEE) is undergoing a significant transformation as investment flows are projected to reach between €18 billion and €22 billion by 2025. This marks a notable increase from the estimated €11 billion to €13 billion per year seen prior to 2022. The shift reflects a growing recognition of the region’s strategic importance within the broader European energy transition, moving it from a high-risk perception to a more favorable investment destination.
Key drivers behind this surge include heightened security imperatives following recent crises, ambitious renewable energy targets, alignment with European Union regulatory frameworks, and a recalibration of geopolitical risks affecting supply chains. Investments are now being diversified across various segments of the energy system, including generation, grid enhancements, storage solutions, and industrial energy efficiency projects.
Renewable energy continues to dominate investment interest, accounting for approximately 45% to 50% of total capital deployment in SEE. Cumulative capital expenditures (CAPEX) for new renewable projects are expected to exceed €9 billion to €10 billion. Countries like Greece, Romania, Bulgaria, and Serbia are leading in this sector due to favorable auction frameworks and improved access to grids. The CAPEX for utility-scale solar projects has stabilized at around €550,000 to €700,000 per megawatt (MW), while onshore wind projects average between €1.2 million and €1.4 million per MW.
A significant trend in 2025 is the shift toward hybrid revenue models for renewable investments. Traditional merchant exposure is giving way to more secure financing structures that incorporate corporate power purchase agreements (PPAs), indexed floor-price contracts, and state-backed contracts for difference. This evolution has broadened the investor base beyond traditional infrastructure funds to include pension funds and insurance companies seeking stable returns linked to inflation.
Energy storage has emerged as one of the fastest-growing segments within the SEE investment landscape, attracting approximately €1.5 billion to €2 billion in committed capital in 2025. This growth is notable considering that prior investments were below €300 million annually before 2023. Utility-scale lithium-ion battery systems are primarily being developed in Greece, Romania, and Bulgaria, with installations typically ranging from 50 MW to 200 MW and durations of one to two hours. The decline in installed CAPEX for grid-scale batteries—now around €400 to €500 per kilowatt-hour—has enabled these projects to compete effectively in ancillary services without heavy reliance on subsidies.
Grid upgrades represent another critical area of investment, with estimates suggesting that around €5 billion to €6 billion will be allocated for transmission infrastructure improvements in 2025. This includes high-voltage transmission reinforcements and cross-border interconnectors aimed at enhancing regional connectivity with Central Europe and the Eastern Mediterranean. Projects often require significant capital outlays ranging from €200 million to €400 million per corridor and utilize blended financing structures that combine EU grants with private capital.
While public-sector financing remains important, it is no longer the primary source of funding for energy projects in SEE. Institutions like the European Investment Bank (EIB) and the European Bank for Reconstruction and Development (EBRD) continue to play a pivotal role by providing 20% to 40% of total project funding, thus reducing perceived political and regulatory risks for commercial lenders entering these markets.
Green bonds have transitioned into mainstream financing tools within the region, with issuance surpassing €4 billion in 2025 compared to less than €1 billion annually before 2021. These bonds are increasingly utilized not only for renewable projects but also for grid modernization and energy efficiency initiatives. Additionally, sustainability-linked loans have gained traction among corporate users aiming to align their financing strategies with environmental commitments.
Investment in industrial energy efficiency has also become prominent, with an estimated capital deployment of €1.2 billion to €1.6 billion targeted at sectors such as metals processing and food production. These projects typically involve CAPEX ranging from €5 million to €30 million per site and promise payback periods of three to six years through substantial reductions in energy consumption.
The sophistication of financing structures has notably improved as well; project finance now often combines senior debt from banks with equity from strategic investors or utilities. This layered approach allows capital costs to be assessed based on risk rather than geographical location, which is crucial for closing the investment gap between SEE and Western Europe.
Another emerging trend is the increased involvement of regional utilities and pension funds as equity investors in large-scale projects. This shift reflects stronger balance sheets among local institutions and a growing recognition that energy assets can provide long-term returns aligned with domestic liabilities.
The strategic focus of investments in 2025 highlights a preference for projects that contribute simultaneously to decarbonization efforts, supply security, and market integration. Stand-alone generation assets lacking grid access or revenue visibility face challenges securing financing compared to those enhancing system flexibility or cross-border resilience.
The overall robustness of investment flows indicates a re-evaluation of Southeast Europe’s role within the European energy landscape. The region is increasingly seen as a vital component capable of attracting significant capital while delivering competitive returns. Moving forward, ensuring regulatory effectiveness and grid readiness will be essential in maintaining this momentum and meeting investor demand.
