As the energy landscape in South-East Europe (SEE) evolves, the rapid growth of utility-scale solar power is transitioning from mere expansion to a phase of structural integration. Countries like Hungary, Romania, and Greece have significantly increased their installed photovoltaic capacity, which now plays a crucial role in shaping intraday electricity prices. However, recent performance data from January to February 2026 indicates that solar energy alone cannot replace gas as the marginal source during peak demand periods.
The current solar cycle in SEE is characterized by its interaction with existing energy systems rather than sheer growth. Hungary has emerged as a leader in solar intensity within the region. During clear midday conditions, solar production pushes spot prices down, compressing price spreads between base and peak demand periods. Nevertheless, the winter months reveal a critical limitation: lower irradiance restricts generation precisely when evening demand peaks, leading to increased ramp risk for gas-fired units.
Romania’s solar market is experiencing a notable financial transformation. The previous reliance on merchant exposure is shifting towards hybrid revenue models that incorporate contract-for-difference mechanisms alongside corporate power purchase agreements. This evolution reflects a growing sophistication among developers as they seek to mitigate volatility risks by layering fixed-price agreements onto their market exposure. Such strategies are essential as market forecasts increasingly reflect uncertainties driven by gas prices.
In Greece, the challenges of solar integration are particularly pronounced due to issues of congestion and curtailment. The pace of transmission infrastructure development has not kept up with the rapid deployment of photovoltaic systems, especially in areas constrained for export. Consequently, curtailment risks are becoming a significant factor in pricing rather than an isolated operational challenge. The integration of battery storage solutions is now seen as a necessity for financial viability rather than merely an enhancement.
The systemic implications of solar energy in January 2026 can be distilled into three key observations. First, the reshaping of intraday price curves due to midday compression leads to reduced revenue capture for merchant plants while widening evening peak spreads. This scenario heightens volatility during trading hours from noon to 8 PM. Second, the sensitivity of ramping increases as daytime output diminishes rapidly during winter months, necessitating aggressive responses from gas-fired units to meet evening demand—a situation that reinforces gas’s role as the marginal source rather than diminishing it. Third, the likelihood of curtailment rises in saturated systems; without enhancements to grid infrastructure or scaling up storage capabilities, additional photovoltaic capacity tends to exert diminishing effects on price suppression.
Modeling indicates that for solar energy to significantly impact regional price ceilings, one or more structural changes must occur: large-scale battery deployment, expansion of cross-border transmission capacities, or an increase in demand-side flexibility. In the absence of these developments, solar power remains primarily a daytime price influencer rather than a disruptive force against established pricing structures.
Looking forward, hybridization emerges as a pivotal factor. Projects currently under development are increasingly integrating photovoltaic arrays with battery storage systems capable of 2-4 hours of output. These configurations enable developers to shift generation into peak demand periods, enhancing revenue capture and mitigating curtailment risks. However, the overall operational storage capacity across SEE remains inadequate to substantially reduce gas-driven peaks.
The trajectory of solar energy across South-East Europe presents a complex paradox: while capacity continues to grow and capital structures mature alongside rising awareness of curtailment issues, gas remains dominant during periods of stress in pricing dynamics.
The structural influence of solar energy will increasingly depend on how effectively flexibility is integrated into the system rather than merely focusing on the addition of megawatts.
