# Statistical Analysis of the Correlation between Anomalies in the Czech Electric Power Grid and Geomagnetic Activity

## TL;DR

This study analyzes 12 years of data to find a significant correlation between geomagnetic activity peaks and increased anomalies in the Czech electric power grid, suggesting geomagnetically induced currents impact grid stability.

## Contribution

It provides the first statistical evidence linking geomagnetic activity with power grid anomalies in a mid-latitude European country.

## Key findings

- Anomaly rates increase around geomagnetic activity maxima
- Disturbances are more pronounced shortly after maxima
- Evidence suggests geomagnetic effects influence mid-latitude power grids

## Abstract

Eruptive events on the Sun have an impact on the immediate surroundings of the Earth. Through induction of electric currents, they also affect Earth-bound structures such as the electric power transmission networks. Inspired by recent studies we investigate the correlation between the disturbances recorded in 12 years in the maintenance logs of the Czech electric-power distributors with the geomagnetic activity represented by the K index. We find that in case of the datasets recording the disturbances on power lines at the high and very high voltage levels and disturbances on electrical substations, there is a statistically significant increase of anomaly rates in the periods of tens of days around maxima of geomagnetic activity compared to the adjacent minima of activity. There are hints that the disturbances are more pronounced shortly after the maxima than shortly before the maxima of activity. Our results provide indirect evidence that the geomagnetically induced currents may affect the occurrence rate of anomalies registered on power-grid equipment even in the mid-latitude country in the middle of Europe. A follow-up study that includes the modelling of geomagnetically induced currents is needed to confirm our findings.