Slovenia's Power Grid Faces Strain from Modern Energy Demands

Slovenia's electrical grid, a system built over the last century, faces mounting challenges as it struggles to accommodate the evolving landscape of energy consumption and production. The traditional model, where power flowed predictably from large power plants to consumers, is no longer sufficient for today's demands.

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The electricity grid, which we have gradually built over the past century, was designed for a different use of electricity than what we are witnessing today. The flow of electricity was predictable and always in the same direction; from large power plants through the transmission to the distribution network and from there to consumers. People and factories were only consumers, electricity production and consumption were unambiguous and unequivocal.

Aleksander Mervar, director of Eles, explained that citizens, now equipped with numerous rooftop solar power plants, have become significant energy producers. This decentralized generation, coupled with the rise of electric mobility, battery storage systems, heat pumps, and data centers, is creating unprecedented disruptions. "The grid, without additional equipment, reinforcements, new transmission lines, and extensive software upgrades, simply will not withstand this," Mervar stated, emphasizing the need for a radical transformation, particularly of the distribution network.

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Today, citizens with an increasing number of solar power plants on their roofs are major electricity producers. Disruptions are also caused by increasing electric mobility with a network of charging stations, battery storage, heat pumps, and data centers.

The strain is most evident in the distribution network, leading to restrictions on new connections, the necessity for line reinforcements, transformer replacements, and more complex voltage management and planning. Ivan Šmon, president of the assembly of GIZ distribution of electricity and chairman of Elektra Gorenjska, detailed these consequences.

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The grid, without additional equipment, reinforcements, new transmission lines, and extensive software upgrades, simply will not withstand this. These changes require a radical transformation, especially of the distribution network.

Mervar sees a critical solution in establishing a unified data platform. This platform would enable real-time data acquisition from the entire electro-energy system, integrating data from Eles and all five electricity distribution companies. "Another necessary measure is related to the control of an increasing number of renewable energy sources, especially solar power plants," Mervar added, highlighting concerns about their automatic responses and the operator's ability to influence their production to regulate the system. He pointed to the collapse of the Spanish power system as a serious warning of the potential for worst-case scenarios.

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The biggest pressures are appearing on the distribution network. The consequences are seen in restrictions on connections, the need for line reinforcements, transformer replacements, voltage management, and increased planning complexity.