While wind is a factor, it is not the only factor that is taken into consideration to de-energize. PSPS events happen when the weather forecast is so severe that people’s safety, lives, homes and businesses may be in danger of wildfires. We carefully review a combination of factors when deciding if power must be turned off. These factors include: A Red Flag Warning declared by the National Weather Service. Low humidity levels, generally 20% and below. A forecast of high winds, particularly sustained winds above 25 miles per hour and wind gusts above 45 miles per hour. Dry material on the ground and low moisture content in live vegetation. Real-time, on-the-ground observations from our Wildfire Safety Operations Center and from our crews.
For more information, visit our Why PSPS Events Occur page.