The operational landscape of Slovenia’s energy sector has been impacted by an early shutdown of Unit 6 at the Šoštanj Thermal Power Plant, which went offline on April 10. This unplanned interruption occurred just a day prior to its scheduled seasonal maintenance, highlighting the vulnerabilities within the country’s thermal generation capabilities. Data from the facility indicated a significant drop in output during the morning hours, a clear indication of an unexpected technical failure.
Initially, the unit was slated for a controlled shutdown on April 11, timed strategically after peak evening electricity demand, as heating requirements from the neighboring Velenje were anticipated to decrease. However, a technical fault necessitated an immediate response, prompting the operator to advance the shutdown timeline due to safety considerations.
The cause of this disruption was traced to a disturbance within the generator, which resulted in heightened vibrations in the turbine. This condition triggered an automatic shutdown of the turbo-generator unit. In response to this incident, while Unit 6 was taken out of service, heat production continued through gas turbines to maintain supply stability and meet ongoing demand.
Although this outage was unplanned, it aligns closely with Šoštanj’s pre-established maintenance schedule. The operator has projected that Unit 6 will likely be back online by mid-September, coinciding with an expected rise in seasonal demand for thermal energy as colder weather approaches.
