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☀️ '''Solar storm''' refers to a disturbance originating from the sun — typically a coronal mass ejection (CME) or severe solar flare — that can interact with Earth's magnetosphere and induce geomagnetic effects capable of disrupting electrical grids, satellite communications, GPS navigation, and electronic systems. For the insurance industry, solar storms represent a low-frequency but potentially catastrophic [[Definition:Emerging risk | emerging risk]] with the capacity to trigger widespread, correlated [[Definition:Loss | losses]] across multiple lines of business — including [[Definition:Property insurance | property]], [[Definition:Business interruption insurance | business interruption]], [[Definition:Aviation insurance | aviation]], [[Definition:Satellite insurance | satellite]], [[Definition:Cyber insurance | cyber]], and [[Definition:Power generation insurance | power generation]] coverage. The 1859 Carrington Event, which caused telegraph systems to fail globally, remains the benchmark scenario for severe space weather, and a comparable event in today's technology-dependent world would produce insured losses on a scale that challenges the limits of industry capacity.

🔬 Modeling the insurance impact of solar storms requires bridging astrophysics and financial risk analysis — a challenge that [[Definition:Catastrophe modeling | catastrophe modeling]] firms and [[Definition:Reinsurance | reinsurers]] have increasingly taken on. Unlike hurricanes or earthquakes, for which decades of historical loss data exist, severe geomagnetic storms lack a robust actuarial loss history, forcing modelers to rely on physical simulations, engineering vulnerability assessments, and scenario-based approaches. A major geomagnetic event could damage high-voltage transformers — which take months or years to replace — leading to prolonged regional blackouts. The resulting cascade would trigger [[Definition:Business interruption insurance | business interruption]] claims, spoilage losses, supply chain disruptions, and potentially [[Definition:Contingent business interruption insurance | contingent business interruption]] exposures far from the physically affected area. [[Definition:Satellite insurance | Satellite insurers]] face direct exposure, as charged particles can degrade solar panels, damage electronics, and alter orbits. [[Definition:Lloyd's of London | Lloyd's of London]] has published scenario studies estimating that a Carrington-level event could produce economic losses in the trillions of dollars, with insured losses representing a significant fraction depending on policy terms and [[Definition:Exclusion | exclusions]] in force.

⚡ The insurance industry's response to solar storm risk is still maturing. Many commercial [[Definition:Insurance policy | policies]] do not explicitly address geomagnetic events, creating ambiguity about whether resulting losses would fall under existing [[Definition:Peril | perils]] like fire, electrical damage, or equipment breakdown — or be excluded as force majeure. Some [[Definition:Underwriting | underwriters]] have begun introducing specific space weather [[Definition:Exclusion | exclusions]] or sub-limits, while others see an opportunity to develop affirmative coverage for clients with high exposure, such as power utilities and satellite operators. Regulatory bodies, including the [[Definition:National Association of Insurance Commissioners (NAIC) | NAIC]] in the United States and the [[Definition:Prudential Regulation Authority (PRA) | PRA]] in the United Kingdom, have flagged space weather as a systemic risk warranting attention in [[Definition:Own Risk and Solvency Assessment (ORSA) | ORSA]] and stress-testing exercises. For [[Definition:Reinsurance | reinsurers]] and [[Definition:Insurance-linked securities (ILS) | ILS]] investors, solar storms present a diversification characteristic — they are uncorrelated with traditional natural catastrophe and financial market risks — but the uncertainty around loss magnitude makes pricing and structuring coverage exceptionally difficult. As society's dependence on electronic infrastructure deepens, the potential insurance relevance of solar storms only grows.

'''Related concepts:'''
{{Div col|colwidth=20em}}
* [[Definition:Catastrophe modeling]]
* [[Definition:Emerging risk]]
* [[Definition:Business interruption insurance]]
* [[Definition:Satellite insurance]]
* [[Definition:Systemic risk]]
* [[Definition:Cyber insurance]]
{{Div col end}}

Definition:Solar storm - Revision history

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