South East Europe is seeing one of the fastest renewable-energy expansions in its history. Developers have announced new solar and wind projects across Greece, Romania, Bulgaria, Serbia, Montenegro, North Macedonia and Albania. Utilities are adjusting strategies, investors are deploying capital, and governments are promoting renewables as part of the region’s energy transition.
The pace of generation additions is outstripping the infrastructure required to support them. Grid networks, storage facilities, system flexibility and market mechanisms are struggling to keep up with the rapid increase in renewable output. This mismatch is affecting how power systems balance supply and demand.
Solar PV growth and flexibility constraints
Solar power is cited as the clearest example of the shift in the regional electricity mix. According to ACER, solar PV capacity in selected South East European EU markets reached approximately 29 GW in 2025. The same data indicates that this expansion has reshaped generation patterns.
While renewable capacity has grown quickly, dispatchable generation and flexibility resources have not expanded at the same rate. During sunny daytime hours, higher solar output can push wholesale electricity prices lower. As solar production falls in the evening while demand remains elevated, systems must rely on flexible generation, storage, imports or demand-side response.
Where those balancing resources are insufficient, price outcomes can become more volatile. The source links this to balancing challenges and periods of scarcity-driven pricing. These dynamics reflect constraints in flexibility and market operations as solar penetration rises.
Western Balkans pipeline versus operating capacity
The Western Balkans are used to illustrate both the scale of planned development and the operational challenges. Research by Global Energy Monitor, REScoop.eu and CEE Bankwatch found that prospective utility-scale solar and wind projects exceeded 23 GW in 2024. The figure is described as a sharp increase compared with the previous year.
Despite that pipeline, operational utility-scale solar and wind capacity remained around 1.5 GW. An additional 1.3 GW was reported as under construction. The gap between announced projects and operating assets points to delays between planning and commissioning.
The source attributes these delays to multiple hurdles faced by projects. Barriers include permitting procedures, land acquisition, financing requirements, grid-connection constraints, offtake agreements and curtailment risks. In several markets, grid access and profitable operation are described as key limitations rather than investor interest.
Serbia’s share of prospective projects
Serbia is highlighted within the Western Balkans pipeline figures. The same research found that Serbia accounted for nearly half of the region’s prospective utility-scale solar and wind pipeline. This indicates strong investor interest concentrated in a single market.
The source also connects Serbia’s large share to increased competition for connection capacity. It notes additional pressure on permitting institutions as well as a higher likelihood that some announced projects may not reach construction. These factors relate directly to grid availability and project delivery timelines.
Storage, demand response and wind diversification
The next stage of renewable development is framed around project characteristics rather than only installed megawatts. The source describes a project with reliable grid access, integrated storage, stable revenue structures and limited curtailment exposure as potentially more valuable than a larger standalone project facing operational constraints.
Energy storage is presented as increasingly important across the region. Battery systems can absorb excess solar production during oversupply periods and discharge during evening demand peaks. They can also reduce imbalance costs and participate in ancillary-service markets.
Pumped-storage hydropower is described as providing similar benefits at larger scale. Demand-response programmes are also referenced as a way for industrial consumers to shift consumption away from high-price periods . These measures address flexibility needs created by variable renewable output.
Wind power is also described as strategically relevant where solar dominates daytime production. Wind assets generating more consistently during evenings, nights or winter months may achieve stronger capture prices while adding diversification to portfolios . Over time, the source expects competitive portfolios to combine multiple technologies rather than rely on a single generation source.
What investors assess: grid access and monetising flexibility
For investors and lenders, the question is no longer whether South East Europe has sufficient solar or wind resources. The source states that the more important issue is whether projects can secure grid access and manage curtailment risks. It also lists requirements related to controlling imbalance costs and protecting revenues.
The ability to monetise flexibility is presented as part of project bankability considerations . The source concludes that Southeast Europe’s renewable expansion is real and likely to continue, while long-term outcomes depend on building commercially sustainable systems rather than only increasing project counts.
