Nuclear power continues to play a crucial role in shaping the energy landscape of South-East Europe, particularly in countries like Bulgaria and Romania. As these nations grapple with fluctuating energy prices and an increasing reliance on various energy sources, nuclear generation emerges as a key stabilizing force. However, recent market behaviors highlight the limitations of nuclear flexibility during peak demand periods, raising important considerations for energy policymakers and market participants.
In Bulgaria, nuclear energy accounts for approximately one-third of total electricity generation, providing a steady and low-cost baseload that helps stabilize average pricing. This reliability has proven essential, especially during times of regional price surges. For instance, in January 2026, Bulgaria’s nuclear output was instrumental in maintaining supply adequacy amidst escalating prices across the market.
Despite its stabilizing effects on average prices, the value of nuclear power is not without its complexities. Nuclear plants are designed for constant output and lack the flexibility to adjust production in response to sudden demand spikes or changes in renewable energy generation. This inflexibility can exacerbate market volatility during critical hours, as evidenced by January’s price spikes where daily peaks reached €282.33/MWh. During these instances, it was not a shortage of nuclear generation that drove prices higher but rather the inability of nuclear units to ramp up production when needed.
Romania exhibits a similar trend, though with slightly less intensity. While its nuclear fleet contributes to overall baseload stability, the limited share of nuclear capacity relative to the entire system size means it cannot singularly dictate marginal pricing during periods of stress. In January 2026, reduced hydroelectric output led to gas and imports taking over as marginal price setters, pushing electricity prices above €150/MWh.
The structural paradox of nuclear energy in South-East Europe becomes apparent: while it reduces overall dependence on gas for energy generation, it does not mitigate gas’s role during peak demand situations. By maintaining a large share of inflexible baseload capacity, nuclear power inadvertently increases reliance on more flexible resources to manage variability within the system.
The interaction between nuclear and renewable energy sources also presents challenges. High levels of wind or solar generation can lead to increased curtailment risks due to nuclear’s inability to adjust output accordingly. Conversely, during periods of low renewable production, nuclear cannot fill the gaps left by insufficient renewable generation, further widening flexibility gaps within the grid.
Looking ahead, discussions around modernization and life-extension initiatives for existing nuclear facilities may help sustain their baseload contributions. However, such efforts are unlikely to alter the fundamental operational characteristics of these plants in the near term. The potential for small modular reactors remains largely speculative within the current market context.
In conclusion, while nuclear power serves as an average-price stabilizer in South-East Europe’s electricity markets, it should not be viewed as a solution for volatility management. Energy trading strategies and regulatory frameworks that assume nuclear will mitigate peak risks may misinterpret its structural role. As the region continues to evolve its energy mix, understanding the limitations and strengths of nuclear power will be vital for effective system planning and market stability.
