Investigators are zeroing in on their goal to determine exactly what caused molten aluminum and metal to drop from a 115,000-volt PG&E power line tower at about 6:15 a.m. on November 8 near Poe Dam seven miles east of Paradise, California. A few hours later most of the town had been reduced to ashes as 50 mph winds pushed the wildfire through the community, killing at least 85 people and making thousands homeless.

As reported by an article in the Mercury News, something failed on the tower, causing a power line to get loose and whip around, striking metal which instantly heated, melted, and dropped to the ground igniting the vegetation. It could have been “a tiny O-ring that holds up rows of disc-shaped insulators, or possibly fatigued steel from one of the tower’s arms”, the article explains. The tower was built in 1919 which raises the possibility of worn out parts and metal fatigue. CAL FIRE has removed some pieces from the tower to examine further.

The newspaper also reports that CAL FIRE is investigating a possible second point of ignition below a PG&E lower voltage distribution line that occurred about half an hour after the first failure.

The Camp Fire started 13 months after the disastrous fires that burned in the Napa Valley in October of 2017. There are reports that at least 12 of them were caused by Pacific Gas & Electric power lines.