South East Europe’s power transition is frequently framed around renewables, but the region also operates as a security-of-supply market. In that setting, gas is described as structurally important. The central operational requirement highlighted in the region is flexibility to manage variability in generation.
Solar and wind output are expanding, but they can be variable and may not align with periods of highest demand. Hydropower can provide balancing capacity, although it depends on hydrological conditions. Coal remains significant in parts of the Western Balkans, while batteries are scaling to cover short-duration needs.
Within this system, gas is identified as one of the few dispatchable options for balancing variability and supporting system reliability. The role of gas is therefore linked to its ability to respond when other resources are constrained.
Neptun Deep and regional gas supply diversification
Romania’s Neptun Deep project is presented as the largest regional example of new gas supply. The Black Sea development is being carried out by OMV Petrom and Romgaz on a 50/50 basis. Investment is described as up to €4 billion, with production expected to start around 2027.
The project’s estimated output is approximately 8 billion cubic meters per year, positioned as a major domestic supply source. The implications extend beyond Romania through increased regional diversification. Additional production is also described as reducing reliance on import routes exposed to geopolitical risk.
The source material links this to Romania’s potential role as a supplier within South East and Central Europe. It also frames domestic output as part of broader supply resilience in the region.
Alexandroupolis LNG terminal and Balkan entry capacity
The Alexandroupolis LNG terminal in Greece is identified as another strategic element for regional gas access. The floating storage and regasification unit has a capacity of up to 5.5 bcm per year. It is designed to supply not only Greece but also Bulgaria, Romania, Serbia, North Macedonia, Moldova, Ukraine, Hungary, and Slovakia.
The terminal is described as transforming Greece into a regional LNG entry point for the Balkans. The material also connects LNG infrastructure with interconnectors and reverse-flow capabilities. It further references the emerging Vertical Corridor concept in relation to changes in gas flows across South East Europe.
The investment framing in the source text emphasizes that gas infrastructure should be assessed as part of flexibility and security systems rather than only long-term fossil fuel exposure.
Flexibility-focused gas assets versus baseload exposure
The source material distinguishes between different types of gas assets when discussing risk profiles. Traditional baseload gas generation is described as facing increasing risk due to volatile fuel prices and tightening carbon constraints. By contrast, flexible gas assets, LNG infrastructure, storage capacity, and interconnectors are described as retaining strategic and financial relevance where they support reliability.
It lists characteristics associated with more resilient gas-related investments in the region. These include diversification through access to multiple supply sources and enabling coal displacement where older lignite capacity can be replaced alongside growing renewable generation.
The same set of characteristics also includes system flexibility from fast-ramping gas-fired generation supporting evening peaks and compensating for solar variability. It additionally includes regional optionality through cross-border infrastructure that can capture value from price differentials and supply imbalances across markets.
Policy, financing signals, and balancing with renewables
The source text notes structural risks affecting long-term gas economics, including EU climate policy direction, carbon pricing, methane regulations, utilisation uncertainty, and competition from storage technologies. It states that future-proof investments must be designed around flexibility rather than baseload dependency.
Financing markets are described as increasingly differentiating between types of gas exposure. Neptun Deep is characterised as strategic due to large-scale regional production with security implications, while Alexandroupolis is characterised as strategic due to import-route diversification and enhanced resilience.
The material adds that flexible gas-fired generation may remain financeable where it supports capacity adequacy and system stability, while speculative long-term demand growth is harder to underwrite.
The interaction between gas and renewables is presented as central to system design as solar penetration increases and evening or seasonal flexibility becomes more important. Batteries are described as addressing short-duration imbalances, hydro as providing regional balancing where available, and demand response as reducing peak stress.
During extended low-renewable periods, the source text says gas may still act as a critical backup role. It characterises the transition challenge in South East Europe as system optimisation focused on maintaining reliability while reducing emissions and coal dependence over time.
The material concludes that renewables expansion will continue while additional infrastructure will be required when renewable output is insufficient. It states that molecules and electrons will continue to coexist within the region’s energy architecture through at least the medium-term transition phase.
