Tesla Semi fire on Interstate 880 highlights the challenge of electric truck battery blazes
A Tesla Semi caught fire on Interstate 880 in Hayward on Tuesday evening, forcing the California Highway Patrol to shut down traffic in both directions as crews dealt with smoke and the risks tied to a large lithium-ion battery fire.
The closure began around 5:45 p.m. due to concerns over hazardous fumes coming from the electric truck’s battery pack. Northbound lanes reopened by about 8:40 p.m., but southbound drivers were warned that delays could last 15 to 18 hours while firefighters waited for the battery fire to burn down safely.
The driver escaped without injury and reportedly told officers the truck simply caught fire, with no crash involved. Investigators have not yet determined what caused the blaze, so it remains too early to say whether the battery, the vehicle, charging hardware, road conditions, or another factor played a role.
The incident is drawing attention because it appears to be one of the rare Tesla Semi battery fires not linked to a collision. It also brings back memories of a 2024 Tesla Semi crash near Emigrant Gap on Interstate 80, where the resulting battery fire shut down the road for roughly 15 hours. That incident required around 50,000 gallons of water, and aircraft were used to drop fire retardant near the scene.
Electric vehicle fires remain uncommon compared with gasoline vehicle fires, according to Tesla’s own safety data. The company has previously stated that EVs catch fire far less frequently per mile driven, estimating roughly seven fires per billion miles compared with nearly 60 fires per billion miles for the broader U.S. vehicle average.
Still, when a large EV battery does ignite, fighting the fire can be extremely difficult.
Tesla’s emergency response guidance calls for large amounts of water applied directly to the battery enclosure and warns that reignition is possible. For a typical electric vehicle battery fire, Tesla has said thousands of gallons of water may be needed. The Semi, however, carries a much larger battery pack, reportedly around 822 kWh, making the firefighting challenge far greater than with a passenger car.
The core problem is thermal runaway, a chain reaction inside lithium-ion battery cells that can continue even when flames on the outside appear controlled. Spraying the exterior of a sealed battery pack may not cool the cells deep inside fast enough. In some cases, damaged EV batteries can reignite hours or even days later, which is why burned electric vehicles are often monitored long after the visible fire is out.
Firefighters also have to deal with toxic fumes, extreme heat, and high-voltage components. A small handheld extinguisher, the kind many drivers keep in a car, is not designed for this type of incident.
New tools are being developed to help emergency crews handle EV battery fires more effectively. Some firefighting systems can slide beneath an electric vehicle and direct water toward the battery cells from below, improving cooling and reducing the amount of water required. Certain systems can also remain attached during towing in case the battery flares up again.
However, most of today’s EV firefighting equipment is built with passenger cars in mind, not 80,000-pound electric trucks. A Tesla Semi fire presents a very different scale of risk because the battery is far larger and the vehicle itself is much heavier and harder to move.
Other EV fire incidents have shown how resource-intensive these situations can become. In South Korea, a fire involving an electric Mercedes reportedly required 19 fire trucks and 57 firefighters to bring under control. That kind of response illustrates why parking garages, highways, fleet depots, and charging stations are all being reconsidered as more electric vehicles enter daily use.
For now, the Hayward Tesla Semi fire serves as another reminder that while electric trucks may reduce fuel use and tailpipe emissions, emergency response planning must evolve alongside the technology. As battery-powered freight vehicles become more common on major highways, fire departments will need specialized training, better tools, and updated procedures for handling large lithium-ion battery fires safely.
