SEE power markets split further as Hungary premium widens on renewable surge and regional bottlenecks

South East Europe’s 24 April trading session offered a clear lesson in how a physically connected power system can still behave like separate markets. While interconnectors keep headline prices broadly converging, real pricing power increasingly hinges on intraday generation mix, cross-border constraints and—crucially—scarcity of flexibility.

Hungary anchors the region as spreads widen

Hungary again set the pace at €98.21/MWh, up €5.1/MWh day on day. Romania followed at €89.66/MWh (+€1.3), Slovenia at €80.44/MWh (+€5.8) and Croatia at €83.04/MWh (+€5.7), reinforcing the effect of Central European coupling.

Elsewhere, prices fell sharply: Bulgaria at €77.63/MWh (-€10.1), Greece at €76.59/MWh (-€11.5), Serbia at €65.39/MWh (-€0.6), Montenegro at €64.77/MWh (-€9.0), Albania at €61.28/MWh (-€9.7) and North Macedonia at €65.19/MWh (-€4.4). The downward correction widened spreads to Hungary into the €30–35/MWh range.

The driver is supply balance, not demand

This divergence was not demand-led. Regional consumption rose only modestly to 29,828 MW (+334 MW), which was not enough to explain the scale of the price gap.

Instead, the supply stack shifted in a way that matters for flexibility and balancing needs across borders: wind jumped to 3,127 MW (+1,217 MW) and solar stayed elevated at 3,776 MW (down just 151 MW). By contrast, hydro output dropped to 6,291 MW (-839 MW) and gas-fired generation fell to 2,829 MW (-710 MW). Coal held around ~4,940 MW and nuclear remained steady near ~5,724 MW.

A spring pattern: intermittent generation depresses periphery prices

The market’s behavior fits a typical spring profile—strong intermittent renewables suppress prices where they dominate supply, while reduced hydro and gas tighten flexibility in more central systems. That combination helps explain why Hungary maintained a premium: it is balancing imported power while dispatchable flexibility is less available elsewhere and residual demand remains relatively firm.

Cross-border flows support Hungary—but internal bottlenecks limit alignment

Cross-border flows reinforced this picture externally: total net imports into the region reached 1,423 MW (+54 MW), while “core” imports (Austria + Slovakia toward Hungary/SEE) stood at 2,575 MW (+20 MW). The HU-DE spread narrowed to €22.1/MWh but remained wide enough to keep flows directed into Hungary.

Within SEE, however, commercial flow patterns still point to persistent isolation of surplus renewable zones by structural bottlenecks—particularly on Serbia–Bosnia, Montenegro–Albania and Bulgaria–Greece corridors (as referenced in the commercial flow matrix). That separation helps explain localized price depression even when parts of the region are import-dependent.

Intraday volatility shifts value toward flexibility

Hourly curves show how quickly conditions change within the day (with references to page 4 and page 14). Deep midday compression appeared across all SEE markets as solar peaked; negative or near-zero prices showed up in several hubs during daylight hours—Hungary’s minimum reached -€36.4/MWh, Slovenia -€30/MWh and Greece -€14.5/MWh.

Evening hours then reversed sharply: peak-hour prices climbed to €277–280/MWh in Hungary and roughly €180–200/MWh across SEE. Baseload averages therefore obscure where value is moving—toward products that can capture intraday swings rather than simply arbitraging average spreads.

Forwards remain constructive even as spot softens

Despite renewable-driven softness in spot pricing, energy commodities were supportive on the forward side: gas at CEGH traded at €46.33/MWh (+€1.4), coal around €105.5/t for May-26 (+€2.0) and EUA carbon moved along an approximately €70–80/t equivalent trajectory trending upward.

Power forwards for Hungary also pointed to continued tightness expectations, moving to €101.5/MWh (WK19) and €103.5/MWh (May-26). That suggests market participants are pricing resilience beyond the immediate renewable-heavy session.

A layered market structure is emerging

The session’s structural takeaway is that SEE is evolving from a single coupled price zone with minor deviations into a layered system: Hungary functions as a pricing hub linked to Central Europe; Romania behaves more like a semi-core balancing market; and much of the Western Balkans—Serbia, Montenegro, Albania and North Macedonia—operates as a structurally discounted zone where high renewable penetration meets weaker interconnection capacity and limited storage.

For traders and asset owners, this raises the bar for capturing value through flexibility rather than relying on baseload strategies alone. Battery storage, pumped hydro projects such as Bistrica in Serbia, and flexible gas or hybrid RES assets become increasingly important; without them, producers face exposure to midday price collapses driven by intermittent generation.

The persistence of €30+/MWh spreads within a coupled region also signals that transmission infrastructure remains decisive for unlocking value—especially major corridors such as the Trans-Balkan 400 kV route mentioned in the source analysis. Until those constraints ease, SEE is likely to continue trading as two markets: a premium core connected physically but not yet economically aligned with a discounted periphery.