Fire engine
A Cal Fire engine. Photo credit: OnScene.TV

Firefighters continued their efforts Sunday to put out a commercial structure fire that broke out four days ago at one of the largest battery and energy storage facilities in the world in the Otay Mesa area.

Units were originally dispatched early Wednesday afternoon to the massive energy storage facility, Gateway Energy Storage, in the 600 block of Camino De La Fuente.

Progress has been slowed by the fire re-igniting over the course of the week. However, firefighters appeared to be at the tail end of the blaze Sunday, according to Cal Fire San Diego.

“Firefighters continue to mitigate the fire, with only minimum heat remaining,” Cal Fire officials said in an incident update.

A road closure was in effect at Camino De La Fuente at Paseo De La Fuente, according to fire officials.

A total of 40 personnel were assigned to the fire, including one truck, five engines and equipment for hazardous materials.

Personnel from San Diego Fire-Rescue, the San Diego County Sheriff’s Department, and the San Diego County Department of Environmental Health’s Hazardous Materials Division were assisting in the effort.

No injuries were reported, and the cause of the fire is under investigation.

City News Service contributed to this report.