Regional electricity consumption rose 3.1% to 16.34 TWh in Week 25, before the peak summer period had fully developed. The data indicates that July and August demand could move materially higher if temperatures rise across Italy, Greece, Serbia, Hungary, Romania, Croatia and Bulgaria at the same time.
Non-linear power price response during coincident heat and solar decline
The price effect would not be linear as demand increases. A moderate rise in load can be absorbed when hydro, wind and imports are available. A heatwave becomes dangerous when cooling demand peaks in the same hours that solar output begins to fall. This is where the evening block becomes exposed, particularly in markets with limited storage and high import dependency.
Italy and Croatia highlighted by import exposure
Italy would remain the first stress point under the scenario. In Week 25, Italy averaged €127.69/MWh and imported 1.12 TWh net. A heatwave combined with lower hydro and weak wind would reinforce Italy’s import pull and push pressure into the Adriatic and Central European-linked corridors.
Croatia would also face exposure as its demand rose 9.7% in Week 25. Net imports increased by 26.0%, adding to sensitivity during periods when evening flexibility is constrained.
Central European pricing sensitivity and Serbia’s export-linked risk
Hungary and Romania would face a different stress profile because their prices were already above €100/MWh. Hungary averaged €109.16/MWh, while Romania averaged €104.84/MWh. During a heatwave, these markets could reprice sharply if Central European conditions tighten at the same time.
Serbia has a more nuanced risk balance. Hydro recovery and coal availability can soften domestic stress, but SEEPEX can still rise if neighbouring markets pull exports. A hot week with weak regional wind could lift Serbian prices even without a domestic supply shock.
Sensitivity depends on evening flexibility rather than demand alone
The summer stress case is not simply that higher demand leads directly to higher prices. The scenario instead emphasizes that heat matters most when it coincides with weak evening flexibility across the region.
