Washington: Solar, or geomagnetic, storms arise when the Sun releases plasma and magnetic fields from its corona during coronal mass ejections. Upon reaching Earth, these energies interact with conducting materials like the crust or ocean, inducing geoelectric fields. This interaction causes currents that destabilize electrical transmission systems, particularly affecting the extra high-voltage transformers that regulate voltage within the grid.
According to Iraqi News Agency, despite their potential to cause significant disruption, geomagnetic storms remain an under-quantified threat. Current socioeconomic assessments of space weather often isolate disciplines, failing to fully consider the interplay between geophysical drivers and the power grid’s functionality. To bridge this gap, a study by Oughton et al. introduced a novel framework aimed at estimating the economic consequences of a 1-in-250-year geomagnetic storm in the United States. This model integrates physics, engineering, and economics to evaluate hazards, grid vulnerabilities, and potential socioeconomic impacts across different storm severities.
The validation of this model involved comparing simulated effects at electric substations to real-world measurements from the Tennessee Valley Authority during the 2024 Gannon storm. Findings suggest that a 100-year geomagnetic storm could leave 3.5 million people and 91,000 businesses without power, leading to daily economic losses of $1.22 billion. In the event of a 250-year storm, the most severe scenario studied, the impact would extend to 5 million Americans and over 135,000 businesses, with direct daily losses of approximately $980 million and total losses reaching $1.81 billion.
The study offers a rigorous evaluation of the socioeconomic risks posed by space weather and suggests pathways for investment in the power grid to mitigate future storm impacts. The authors recommend further research into cascading power grid dynamics and multi-hazard interactions, such as the compounded effects of a geomagnetic storm during concurrent events like a heat wave or hurricane.