Following the Witch Creek, Guejito, and Rice Canyon fires that destroyed more than 1,300 homes and killed two people in Southern California in 2007, state officials began attempting to force the utility companies to produce maps designating areas where their power lines present the highest risk for starting wildfires. The three large fires in 2007 were sparked by issues with lines operated by San Diego Gas and Electric.
CAL FIRE has not released the causes of the huge fires that started in Northern California October 8 during very strong winds, but at about the same time firefighters were first responding to numerous fires, they also received multiple calls about fallen power lines and electrical transformers exploding. In the next week, the stock price of the company that provides electrical service for large areas of Northern California, Pacific Gas and Electric, dropped 22 percent.
According to the Mercury News, PG&E has been fighting the efforts to map powerline risk areas since 2007. Below is an excerpt from their article:
A review of the mapping project by the Bay Area News Group shows that utilities have repeatedly asked to slow down the effort and argued as recently as July that, as PG&E put it, certain proposed regulations would “add unnecessary costs to construction and maintenance projects in rural areas.”
On Oct. 6, two days before the start of the deadliest outbreak of wildfires in California history, two administrative law judges assigned to oversee the project granted yet another delay at the request of PG&E and other utilities.
[PG&E] claimed there was no evidence that wildfires had been caused by poles not being able to withstand high winds.
The Northern California fires killed at least 43 people and destroyed about 8,900 structures.
Dr. Janice Coen, a Project Scientist at the National Center for Atmospheric Research in Boulder, Colorado ran fine-scale simulations (horizontal grid spacing of 370 meters) analyzing the wind during the time the fires started. Her research showed significantly higher surface wind speeds than previously thought — 75 to 90 mph just upwind of the major fires.
California law dictates that power lines are supposed to be able to withstand 56 mph.