Human Error, Not Weather, Caused Major Power Outages in Estonia's Grid

Human error, rather than severe weather or malicious acts, was the leading cause of significant power outages within Estonia's high-voltage grid during 2025. Elering, the national electricity transmission system operator, reported that ordinary human mistakes were responsible for disruptions affecting customers. Out of 29 recorded incidents involving personnel errors, five led to actual power interruptions for clients. These specific events highlight the vulnerability of the power infrastructure to mistakes made by human operators.

Two of these five interruptions were substantial, with the amount of energy not supplied to customers exceeding 1 megawatt-hour (MWh). While the total duration of all interruptions caused by these human errors was nearly one hour, the impact of each event varied. The findings underscore the critical need for rigorous training, robust safety protocols, and meticulous operational procedures to minimize the risk of human error in managing essential infrastructure like the power grid.