New Study Finds More than Half the Loss Occurs Outside the Blackout Zone
By Lauren Lipuma (American Geophysical Union), Charles Goldsmith (University of Cambridge), and Athena Dinar (British Antarctic Survey)
The daily United States economic cost from solar storm-induced electricity blackouts could be in the tens of billions of dollars, with more than half the loss from indirect costs outside the blackout zone, according to a new study.
Previous studies have focused on direct economic costs within the blackout zone, failing to take into account indirect domestic and international supply chain loss from extreme space weather.
“On average the direct economic cost incurred from disruption to electricity represents only 49 percent of the total potential macroeconomic cost,” says the paper published in Space Weather, a journal of the American Geophysical Union. The paper was co-authored by researchers from the Cambridge Centre for Risk Studies at University of Cambridge Judge Business School; British Antarctic Survey; British Geological Survey and University of Cape Town.
Under the study’s most extreme blackout scenario, affecting 66 percent of the US population, the daily domestic economic loss could total $41.5 billion plus an additional $7 billion loss through the international supply chain.
Electrical engineering experts are divided on the possible severity of blackouts caused by “Coronal Mass Ejections,” or magnetic solar fields ejected during solar flares and other eruptions. Some believe that outages would last only hours or a few days because electrical collapse of the transmission system would protect electricity generating facilities, while others fear blackouts could last weeks or months because those transmission networks could in fact be knocked out and need replacement.
Extreme space weather events occur often, but only sometimes affecting Earth. The best-known geomagnetic storm affected Quebec in 1989, sparking the electrical collapse of the Hydro-Quebec power grid and causing a widespread blackout for about nine hours.
There was a very severe solar storm in 1859 known as the “Carrington event” (after the name of a British astronomer). A widely cited 2012 paper by Pete Riley of Predictive Sciences Inc. said that the probability of another Carrington event occurring within the next decade is around 12 percent; a 2013 report by insurer Lloyd’s, produced in collaboration with Atmospheric and Environmental Research, said that while the probability of an extreme solar storm is “relatively low at any given time, it is almost inevitable that one will occur eventually.”
Said study co-author Edward Oughton of the Cambridge Centre for Risk Studies at Cambridge Judge Business School:
“We felt it was important to look at how extreme space weather may affect domestic US production in various economic sectors, including manufacturing, government and finance, as well as the potential economic loss in other nations owing to supply chain linkages. It was surprising that there had been a lack of transparent research into these direct and indirect costs, given the uncertainty surrounding the vulnerability of electrical infrastructure to solar incidents.”
The study’s scope was guided by a July 2015 conference held at Cambridge Judge.
The study looks at three geographical scenarios for blackouts caused by extreme space weather, depending on the latitudes affected by different types of incidents.
If only extreme northern states are affected, with 8 percent of the US population, the economic loss per day could reach $6.2 billion supplemented by an international supply chain loss of $0.8 billion. A scenario affecting 23 percent of the population could have a daily cost of $16.5 billion plus $2.2 billion internationally, while a scenario affecting 44 percent of the population could have a daily cost of $37.7 billion in the US plus $4.8 billion globally. (The study is calculated using 2011 US dollars.)
Manufacturing is the US economic sector most affected by those solar-induced blackouts, followed by government, finance and insurance, and property. Outside of the US, China would be most affected by the indirect cost of such US blackouts, followed by Canada and Mexico — as “these countries provide a greater proportion of raw materials, and intermediate goods and services, used in production by US firms.”
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