On 28 April, wholesale electricity prices in Slovenia dropped below zero between 11 AM and 4 PM, marking a rare weekday occurrence of negative pricing. While such dips have become increasingly common on spring weekends, they are still unusual during regular working days.
The trend of negative electricity prices is gaining traction across Europe, driven by the rising share of renewable energy sources like solar and wind. These conditions often lead to an electricity surplus in the grid, particularly when generation is high but consumption is low—most often seen during sunny weekends in warmer months. However, such pricing anomalies are now beginning to appear on weekdays as well.
For 28 April, day-ahead electricity prices on Slovenia’s BSP Southpool exchange were negative during a five-hour window, reaching a low of -6.18 euros/MWh between 2 and 3 PM. This pattern coincided with the lead-up to the 1 May holidays, a period marked by reduced economic activity, closed schools, and many people taking vacations—further lowering electricity demand.
As renewable energy production continues to grow, such market dynamics are expected to become more frequent, posing both challenges and opportunities for energy system management across the region.
