In Week 18, electricity market dynamics across Southeast Europe have highlighted a significant transformation influenced by the interplay of renewable energy sources, fluctuating demand patterns, and varying national balancing conditions. While some markets experienced a reduction in wholesale prices, the underlying data indicated an increase in intraday volatility and a growing reliance on balancing flexibility over traditional baseload generation.
Regional electricity demand saw a week-on-week decline of -2.82%, totaling 14,558.6 GWh. This decrease was attributed to a combination of milder weather, reduced industrial activity, and lower heating needs. Italy reported the steepest drop at -5.06%, followed closely by Hungary with -6.21%. Other countries like Greece and Romania noted moderate reductions, while Türkiye’s demand remained relatively stable with only a -0.82% change. Serbia’s demand decreased by -3.57%, and Croatia saw a reduction of -4.72%.
The regional pricing landscape displayed notable fragmentation despite the overall decline in demand. Greece and Bulgaria experienced moderate price decreases of around -5%, while Hungary’s prices fell by -3.21%. In contrast, Italy’s prices remained largely unchanged at elevated levels, and Romania saw a slight increase of +0.60%. Serbia and Croatia diverged sharply from these trends, with price increases of +7.15% and +7.90%, respectively.
The pricing structure across the region remains uneven, with Italy leading as the most expensive major market in Southern Europe at an average wholesale price of €108.49/MWh. Romania follows at €87.51/MWh, while Serbia’s prices hover around €86/MWh. Croatia is near €79/MWh, and Greece stands at €74.75/MWh. Notably, Türkiye reported a drastic plunge to just €7.23/MWh.
A primary factor contributing to the regional easing was a resurgence in renewable generation, which increased by 11.1% week-on-week, reaching 3,459.6 GWh. This growth was largely driven by wind recovery, which surged by 24.7%, while solar output remained relatively stable with an increase of 1.1%.
Türkiye emerged as a key stabilizer within the region during this period; its wind generation nearly doubled with an increase of +98.3%, leading to an overall renewable production rise of 69.3%. Greece also recorded significant gains in renewable output, with solar generation climbing by 26.5% and wind production increasing by 17.1%.
The performance of renewables was not uniform across all countries; Serbia faced one of the sharpest declines in variable renewable generation at -40.4%, primarily due to unfavorable wind conditions. Bulgaria also saw a considerable drop at -22.3%, while Romania and Croatia experienced moderate decreases.
This divergence in renewable performance elucidates why certain markets deviated from broader regional pricing trends; those facing underperformance in renewables required more thermal dispatching and balancing imports, which exerted upward pressure on prices despite weaker overall demand.
The hourly price dynamics revealed critical signals for market participants: intraday price curves indicated significant midday drops followed by steep evening increases, with some regions briefly entering negative pricing during solar-heavy hours before surging past €200/MWh.
This expanding intraday spread reflects one of the defining shifts within the SEE electricity market as increased solar penetration coupled with inadequate storage solutions leads to unstable hourly pricing structures—lower prices during daylight hours due to abundant solar output contrasted sharply with evening spikes driven by thermal generation regaining control as solar production waned.
The evolving market environment increasingly favors flexible assets over traditional baseload generation models; thus, battery storage systems, pumped hydro resources, rapid-response gas units, ancillary services, balancing reserves, and cross-border trading capabilities are becoming essential for maintaining stability across Southeast Europe.
Total hydropower production showed relative stability overall but registered a slight decline of only -1.57%, totaling approximately 3,739.5 GWh. However, substantial regional differences were observed: Croatia experienced remarkable hydropower growth at +132.2% while Serbia’s hydro generation rose nearly 20%. In contrast, Bulgaria suffered significant declines at –33.4% .
The importance of hydrology for balancing remains paramount since hydro generation serves as a critical flexibility buffer against intermittent wind and solar outputs; nations with robust hydro systems demonstrated superior resilience against renewable intermittency this week.
A marked decrease in thermal generation was noted across the region as well; it declined by -9.66% week-on-week to reach approximately 3,527 .8 GWh . Coal/lignite output fell by –6 .5% , while gas-fired generation decreased significantly by –12 .6% . Türkiye recorded the largest contraction in thermal output at –19% , while Hungary also saw substantial reductions.
An interesting internal fuel-switching pattern emerged in Greece where lignite generation surged by +76 .8% while gas-fired generation dropped –22 .4% , indicating strategic displacement during peak periods to leverage cheaper domestic resources.
This week also witnessed shifts in cross-border electricity flows; net imports across Southeast Europe dropped by –12 .8% to approximately 1,079 .5 GWh due to enhanced domestic renewable production coupled with reduced demand levels.
The most notable transition occurred in Greece which moved from near-balance conditions into a net export position of about –109 .7 GWh . Serbia reduced its net imports significantly—by almost –69% —while Romania and Hungary also lowered their external dependencies.
Bulgaria maintained its status as a net exporter even though export volumes diminished considerably; Türkiye slightly adjusted its export position due to improved domestic renewable outputs alleviating local balancing requirements.
This week’s developments underscore an increasing strategic role for interconnectors within SEE operations as national systems become more interdependent rather than isolated entities; effective balancing will increasingly hinge on cross-border synchronization and congestion management strategies.
A critical observation from Week 18 is that despite temporary easing within SEE markets amid softer conditions, broader European electricity prices have risen significantly during this period—with France seeing an extraordinary weekly increase of +63 .39%
while Spain , Portugal , Slovakia , Slovenia , Poland , Germany , and Austria all reported substantial gains.
This divergence highlights Southeast Europe’s current reliance on temporary supports from renewables and hydro resources while remaining vulnerable to overarching European gas-linked pricing mechanisms; should TTF gas prices escalate further due to geopolitical tensions in the Middle East, upward pressures on SEE electricity markets may re-emerge despite advancements in renewable penetration.
The strategic outlook indicates that Southeast Europe is transitioning into an era focused on flexibility within electricity markets where future developments will hinge not solely on expanding wind or solar capacities but rather on accelerating the deployment of necessary balancing infrastructures alongside these resources.
The integration of battery energy storage systems , modernization efforts for pumped hydro facilities , digitalization initiatives for grid management , ancillary service market enhancements , dynamic balancing frameworks , and optimized cross-border congestion strategies are becoming pivotal economic drivers shaping the future landscape of regional electricity markets.
This week has underscored that Southeast Europe’s power system is evolving beyond mere energy scarcity concerns towards prioritizing effective volatility management strategies.
