South East Europe is experiencing one of the fastest renewable-energy expansions in its history. Across Greece, Romania, Bulgaria, Serbia, Montenegro, North Macedonia and Albania, developers are announcing new solar and wind projects at an unprecedented pace. Utilities are adjusting their strategies, investors are deploying capital and governments are promoting renewable growth as a cornerstone of the region’s energy transition.
Yet the renewable boom is exposing a growing challenge. Generation capacity is expanding much faster than the infrastructure needed to support it. Grid networks, storage facilities, system flexibility and market mechanisms are struggling to keep pace with the rapid increase in renewable generation.
Solar power provides the clearest example of this transformation. According to ACER, solar PV capacity in selected South East European EU markets reached approximately 29 GW in 2025, significantly reshaping the region’s electricity mix. However, while renewable capacity has expanded rapidly, dispatchable generation and flexibility resources have not grown at the same rate.
This imbalance is increasingly visible in market prices. During sunny daytime hours, abundant solar generation can push wholesale electricity prices lower. But as solar output declines in the evening and electricity demand remains elevated, the system must rely on flexible generation, storage, imports or demand-side response. Where those resources are insufficient, the result is often higher price volatility, balancing challenges and periods of scarcity-driven pricing.
The Western Balkans illustrate both the scale of the opportunity and the challenges ahead. Research by Global Energy Monitor, REScoop.eu and CEE Bankwatch found that prospective utility-scale solar and wind projects in the region exceeded 23 GW in 2024, representing a dramatic increase compared with the previous year. Yet operational utility-scale solar and wind capacity remained only around 1.5 GW, with an additional 1.3 GW under construction.
The gap between announced projects and operating assets highlights a critical reality of the energy transition. A large development pipeline does not automatically translate into a functioning renewable-energy market. Many projects still face significant hurdles, including permitting procedures, land acquisition, financing requirements, grid-connection constraints, offtake agreements and curtailment risks. In several South East European markets, the key limitation is no longer investor interest but the ability of projects to secure grid access and operate profitably.
Serbia provides a particularly notable example. The same study found that Serbia accounted for nearly half of the Western Balkans’ prospective utility-scale solar and wind pipeline. While this demonstrates strong investor interest, it also increases competition for connection capacity, places additional pressure on permitting institutions and raises the likelihood that a portion of announced projects may never reach construction.
As a result, the next stage of renewable development will be defined not only by the number of megawatts installed but by the quality and flexibility of those megawatts. A project with reliable grid access, integrated storage, stable revenue structures and limited curtailment exposure may ultimately prove more valuable than a larger standalone project facing operational constraints.
This is why energy storage is becoming increasingly important across the region. Battery systems can absorb excess solar production during periods of oversupply and discharge electricity during evening demand peaks. They can also reduce imbalance costs and participate in ancillary-service markets. Pumped-storage hydropower can provide similar benefits on a larger scale, while demand-response programmes can help industrial consumers shift consumption away from high-price periods.
Wind power also has an increasingly strategic role to play. In markets where solar generation dominates daytime production, wind assets that generate more consistently during evenings, nights or winter months may achieve stronger capture prices and provide valuable diversification. Over time, the most competitive portfolios are likely to combine multiple technologies rather than rely on a single generation source.
For investors and lenders, the renewable-energy equation in South East Europe is changing. The fundamental question is no longer whether the region has sufficient solar or wind resources. The answer is already clear. The more important question is whether projects can secure grid access, manage curtailment risks, control imbalance costs, protect revenues and monetise flexibility.
South East Europe’s renewable expansion is real and likely to continue. However, the long-term winners will not necessarily be those that develop the largest number of projects. They will be those that understand the difference between a renewable-energy boom and a bankable, flexible and commercially sustainable renewable-energy system.
