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Critical Infrastructure Protection: Protecting the Electric Grid from Geomagnetic Disturbances

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Report Type Reports and Testimonies
Report Date Dec. 19, 2018
Release Date Dec. 19, 2018
Report No. GAO-19-98
Summary:

Under some circumstances, a severe solar storm could create disturbances in Earth's magnetic field that lead to extensive power outages.

We looked at some technologies intended to protect the U.S. electrical grid from possible effects of these disturbances. Technologies being tested include:

systems that block currents from geomagnetic disturbances

power transformers designed to be more resistant to such currents

The government has taken some steps to mitigate risks, but questions remain regarding the likelihood and intensity of damage from geomagnetic disturbances.

 

Space weather (coronal mass ejection) can cause geomagnetic disturbances on Earth

Depiction of the sun, space, and Earth, with a geomagnetic disturbance approaching Earth's magnetic field.

Depiction of the sun, space, and Earth, with a geomagnetic disturbance approaching Earth's magnetic field.

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