Slovenia's Power Grid Strains Under Renewable Energy Surge, Funding Woes Loom

Slovenia's electricity distribution sector is grappling with significant challenges as it tries to integrate a growing number of renewable energy sources, particularly solar power. While the influx of clean, locally produced energy is positive for consumers and energy independence, it strains the existing technical infrastructure of the distribution network. Issues range from managing power flow to ensuring the stability of protective systems and electromagnetic compatibility.

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If I start with solar power plants, the basic finding is positive: we have more and more clean and locally produced energy in the system. This is good for users, for energy self-sufficiency and reducing emissions.

One pressing concern is the occurrence of negative electricity prices, indicating an oversupply of energy in the system that cannot be absorbed. This situation puts pressure on the transmission operator to maintain grid frequency and may necessitate curtailing production from renewable sources. Experts like Matjaž Osvald from the Association of Electricity Distribution Companies highlight the need for careful consideration of these new operational realities.

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We must be very careful with these comparisons. Comparing the Slovenian system with the Dutch system, which is almost entirely cabled, is like comparing apples and pears.

Comparisons of grid reliability with other countries require caution, as Slovenia's network differs significantly from those in more densely cabled nations like the Netherlands. Osvald points out that weather events remain the primary driver of power outages in Slovenia. While underground cabling is a solution, the sheer scale of the overhead network, approximately 13,000 kilometers, and limitations in funding, teams, permits, and land rights mean this transition will be a long-term endeavor.

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If we have a year without major disasters, the indicators are very good. If widespread weather events occur, the picture quickly changes.

Financially, electricity distribution companies have increased their investments in the network over the last decade, averaging around 153 million euros annually up to 2021. However, Romana Ocvirk notes that without changes in funding sources, maintaining this investment level will become impossible by 2027-2028, posing a future risk to the network's capacity and reliability.

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If we look at the last ten years, electricity distribution companies have invested an average of approximately 153 million euros per year in the network.