Overloaded Power Line Caused May 19 Outage in Eastern Latvia

Latvia experienced a significant power outage on May 19, affecting numerous substations across the eastern part of the country. The incident, which disrupted electricity supply to areas including Gulbene, Balvi, Alūksne, Rēzekne, and Ludza, has been analyzed by the transmission system operator, AST.

Initial findings indicate that the outage stemmed from a technological fault on the Cesvaine-Gulbene 110 kV power line. A previously made repair connection within the line's conductor failed, causing the line to automatically disconnect. This event triggered a cascade effect, as the entire electrical load was diverted to other 110 kV lines, which subsequently became overloaded and shut down.

AST's operational personnel responded swiftly to restore power. Within about 27 minutes, by 12:33 PM, electricity supply was re-established to all affected substations. The damaged power line itself was repaired and brought back into operation by 8:12 PM on the same day, minimizing the duration of the disruption.

While the incident was resolved efficiently, it highlights the fragility of critical infrastructure, particularly in border regions. The rerouting of power due to a single line failure underscores the importance of robust network management and maintenance. For residents and businesses in the affected areas, such disruptions can have immediate economic and social consequences, emphasizing the need for resilient energy systems.