Hurricane Ian’s aftermath has created an unusual and serious problem for Florida’s cleanup crews: electric vehicles that were submerged in saltwater during the storm surge are now catching fire days and weeks later as their corroded battery cells begin failing. Florida’s State Fire Marshal raised the alarm publicly, and the concern is legitimate.
Saltwater immersion is particularly damaging to lithium-ion battery packs. The salt acts as an electrolyte, accelerating the corrosion of internal battery components and creating conditions that can trigger thermal runaway — the self-reinforcing heat reaction that causes battery fires — without any external ignition source. Unlike a gasoline fire that requires fuel, oxygen, and an ignition event, a corroded battery cell can begin the process entirely on its own, which makes prediction and prevention difficult.
The timing is especially challenging. Many of these vehicles appeared to be intact after the immediate storm event. They were towed, stored, or left in place while owners dealt with other hurricane damage. Days later, they started catching fire — in storage lots, on flatbed trucks, in driveways. Several incidents of this type occurred across the affected counties, creating additional hazard during a period when emergency services were already stretched.
The situation has prompted updated guidance from manufacturers and fire authorities about handling flood-damaged EVs. Insurers are being advised to treat saltwater-submerged EVs as total losses even if they appear driveable, and storage facilities are being warned about segregating flood-damaged EVs from conventional vehicles. The protocols are being developed in real time, driven by the scale of what Ian produced.
This doesn’t change the overall safety calculus for EVs in normal operation. But it does add an important footnote to the climate resilience argument for electric vehicles: in flood-prone regions, the risk profile for storm-damaged EVs is meaningfully different from storm-damaged conventional vehicles, and that’s a practical consideration that residents, insurers, and planners in vulnerable areas need to account for.
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