Power grids face unexpected slow-burn threat from solar storms
New Zealand study says prolonged geomagnetically induced currents can stress power grids even without a dramatic current spike
- The study argues that long-duration geomagnetically induced currents can be more operationally important than brief current spikes in some storm events.
- The June 2015 severe storm over New Zealand sustained geomagnetically induced currents for an extended period and did not mainly present as a sharp current surge.
- The study used utility measurements from Transpower New Zealand alongside other datasets to interpret the storm event.
A study published in Space Weather argues that geomagnetic storms can threaten electricity networks through sustained geomagnetically induced currents, not only through brief current spikes. The finding matters for critical infrastructure resilience because prolonged current flow can heat transformers, saturate magnetic cores, and increase wear on grid equipment.
What happened
The study examined the June 2015 severe storm over New Zealand. The researchers report that the event did not mainly produce a sharp surge in grid currents. Instead, it sustained geomagnetically induced currents for about 90 minutes.
UPSC can connect solar storms, geomagnetically induced currents, and transformer vulnerability to questions on critical infrastructure resilience, disaster risk reduction, and science-and-technology applications in energy security. The topic also supports a mains answer on why grid protection depends on local ground conductivity, transmission-line layout, and space-weather monitoring, not only on peak current readings.
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