With High Winds and Dry Conditions Expected in the Northern Sierra and North Valley, PG&E May Need to Proactively Turn Off Power for Safety in Portions of Butte, Plumas and Yuba Counties - Seite 2

State officials classify more than half of PG&E’s 70,000-square-mile service area in Northern and Central California as having a high fire threat, given dry grasses and the high volume of dead and dying trees. The state’s high-risk areas have tripled in size in seven years.

No single factor drives a PSPS, as each situation is unique. PG&E carefully reviews a combination of many criteria when determining if power should be turned off for safety. These factors generally include, but are not limited to:

• Low humidity levels, generally 20 percent and below
• Forecasted sustained winds generally above 25 mph and wind gusts in excess of approximately 45 mph, depending on location and site-specific conditions such as temperature, terrain and local climate
• A Red Flag Warning declared by the National Weather Service
• Condition of dry fuel on the ground and live vegetation (moisture content)
• On-the-ground, real-time observations from PG&E’s Wildfire Safety Operations Center and observations from PG&E field crews

New for 2020: Improved Watch and Warning Notifications

In response to customer feedback requesting more information as soon as possible to ensure they have time to prepare for and plan in advance of a potential PSPS event, PG&E will provide improved Watch and Warning notifications this year.

Whenever possible, an initial Watch notification will be sent two days in advance of a potential PSPS event. This is what is being sent to customers today. One day before the potential PSPS event, an additional Watch notification will go out, notifying customers of the possibility of a PSPS event in their area based on forecasted conditions.

A PSPS Watch will be upgraded to a Warning when forecasted conditions show that a safety shutoff will be needed. Whenever possible, Warning notifications will be sent approximately four to 12 hours in advance of the power being shut off.

Both Watch and Warning notifications are directly tied to the weather forecast, which can change rapidly.

As an example of how notifications have been improved for 2020, customers will see the date and time when power is estimated to be shut off as well as the estimated time when their power will be restored, all provided two days before the power goes out. Last year, the estimated time of restoration was not provided until the power had been turned off.