The Sunbank solar farm in Summerside, P.E.I., has faced a persistent battery fire for nearly a week. While local officials report that air quality remains safe, the blaze continues to emit smoke that may affect nearby residents.
The volatile physics of lithium-ion thermal runaway
Lithium-ion battery fires present unique challenges due to a phenomenon known as thermal runaway. According to a 2023 report from the U.S.-based Fire Protection Research Foundation, these fires occur when battery cells increase in temperature in an uncontrollable way, often due to water exposure or physical impact.
The chemical reaction inside a damaged battery can create flammable gases that are self-sustaining and highly resistant to traditional firefighting techniques. As reported by The Canadian Press,water and clean agents often fail to reach or cool the internal reaction, meaning enormous volumes of water may be required to manage the heat. This creates a high risk of reignition and toxic gas release even after the fire appears to be extinguished.
A $69-million pillar of Prince Edward Island’s energy grid
The Sunbank solar farm represents a massive $69-million investment in Prince Edward Island’s renewable infrastructure. When the facility was officially energized in January 2024,it helped the city increase its reliance on renewable energy sources to 62 per cent.
The facility includes 48,000 solar panels capable of producing 21.6 megawatts of solar energy, supported by a battery capacity rated at 20-megawatt hours. This infrastructure is designed to supply enough energy to power more than 2,500 homes. Funding for the project was a collaborative effort involving federal, provincial, and municipal governments, alongside a $3.1 million contribution from Samsun Technical Investment.
Dr. Heather Morrison’s safety guidance for Summerside
Health officials in Prince Edward Island have issued specific precautions for residents living near the Sunbank site. while air-quality monitoring has confirmed that gases from the burning batteries do not pose a direct threat, officials warn that smoke flare-ups may continue until the fire is officially declared out .
Dr. Heather Morrison,the province's chief medical officer of health, has advised those with underlying respiratory conditions or sensitivities to smoke to reduce their outdoor activities. She noted that toxicology experts at the Atlantic Poison Control Centre in Halifax have reviewed the situation, confirming that while the gases dissipate quickly, residents should still seek medical advice if they experience persistent symptoms.
The unknown trigger for the 20 MWh battery failure
Investigators have yet to determine the exact cause of the Sunbank battery failure. While the Fire Protection Research Foundation notes that impacts or water exposure can trigger thermal runaway,it remains unverified whether these factors played a role in this specific incident.
The lack of a confirmed ignition source leaves several questions regarding the maintenance and safety protocols at the Sunbank site.. Until the smouldering is complete and a formal investigation is conducted, the community remains in a state of heightened vigilance, waiting to see if the $69-million asset can be recovered or if the damage is permanent.
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