San Francisco Chronicle

Key info: Where PG& E’s shut- offs may occur, and what you need to know about them.

- By Michael Cabanatuan, J. D. Morris and Joaquin Palomino Michael Cabanatuan, J. D. Morris and Joaquin Palomino are San Francisco Chronicle staff writers. Email: mcabanatua­n@ sfchronicl­e. com, jd. morris@ sfchronicl­e. com, jpalomino@ sfchronicl­e. com Twitt

Pacific Gas and Electric Co. is preparing for more potential power shutoffs this week that are intended to reduce the risk of an electrical line or another piece of equipment sparking lifethreat­ening blazes amid high winds that raise the risk of fires.

Here’s what you need to know about the potential shutoffs:

How long do power shutoffs last?

Power is restored in stages, by location. During shutoffs last year, PG& E said workers might need up to five days to restore power, but most homes and businesses were back up and running in two days. The company must inspect lines for damage before restoring power.

Why did PG& E start doing preemptive power shutoffs?

PG& E instituted the precaution­ary outages to prevent its equipment from starting wildfires in October 2018, a year after some of its power lines were blamed for the devastatin­g Wine Country wildfires. The company’s thenCEO, Bill Johnson, told state regulators last year that PG& E is working to make forced power shutoffs unnecessar­y, but the goal could take a decade to accomplish.

How does PG& E decide whether to issue a shutoff?

PG& E considers whether red flag fire danger warnings have been issued. Humidity levels must generally be below 20% and high winds above 25 mph, with gusts in excess of 45 mph. Officials also consider the amount of dry vegetation and use observatio­ns from PG& E field crews and meteorolog­ists.

Will these be as bad as the 2019 shutoffs?

Hopefully not. PG& E has added equipment to cordon off the impact of power shutoffs to smaller areas. It has also installed small, selfsuffic­ient powergener­ation or battery facilities in some communitie­s to keep key areas — typically the downtown stretch of smaller towns — powered during a shutoff. These are known as microgrids.

How should I prepare for a power outage?

Public safety and PG& E officials advise residents to prepare for life without electricit­y by:

 Keeping phones and other electronic­s charged while also having backup charging methods available.

 Building or replenishi­ng emergency kits that include flashlight­s, spare batteries, a firstaid kit, emergency food and water, and cash.

 Learning how to manually open your garage door.

 Unplugging electrical appliances to avoid overloadin­g circuits and preventing fire hazards when power is restored.

 Storing drinking water — 2 gallons per day per person and more for pets.

Can solar panels spare me from a power shutoff?

Customers with solar systems are still connected to the PG& E power grid, so if PG& E cuts off the power for safety, their power gets shut off automatica­lly. People who have a home battery paired with their solar system can avoid full outages.

Should I buy a generator?

Generators can be a helpful but expensive solution to a temporary problem. They can run anywhere from a couple of hundred dollars to as much as $ 14,000. Don’t try to install your own generator if you aren’t an expert. The doityourse­lf dangers outweigh the savings benefit.

Why doesn’t PG& E have undergroun­d power lines?

Putting power lines undergroun­d is expensive — $ 3 million per mile, according to a 2017 estimate from PG& E, versus up to $ 800,000 for overhead lines. That’s just for smaller, lowervolta­ge distributi­on lines; longdistan­ce transmissi­on lines are even costlier. Undergroun­d lines would also be harder to fix in an earthquake. But PG& E has put some lines undergroun­d; last year, the utility said it would put lines undergroun­d in Paradise, the Butte County town destroyed by the 2018 Camp Fire, and it has conducted more undergroun­ding in areas vulnerable to fire.

It’s not windy in my area.

Why is my power still cut?

A longdistan­ce power line that delivers electricit­y to you may pass through a location where it’s very windy, or forecast to become windy, according to PG& E, which has previously turned off some of these highvoltag­e lines, known as transmissi­on lines. The company has taken steps to prevent communitie­s from losing power if they don’t have extremely windy weather, including by installing generators at certain substation­s.

Will my cell phone still work?

Cell phone carriers said service should still work during shutoffs. Most cell phone towers have backup generators. Under pressure from regulators, some carriers have moved to add more backup capacity, either with generators or batteries.

What should I do with food in my refrigerat­or?

Meat, poultry, fish and eggs should always be stored at temperatur­es 40 degrees Fahrenheit or colder, and frozen goods should be zero degrees or colder. Officials advise people to keep refrigerat­or and freezer doors closed as much as possible during outages. Refrigerat­ors can safely store food

— and keep items cold — for about four hours. Freezers can keep their temperatur­e for about two days if unopened. Dry ice or blocks of regular ice can help store food.

How can I get updates if I’m not a PG& E account holder?

PG& E has an alert system that notifies nonaccount holders of power outages in a specific area. Company officials said they will try to alert people 48 hours, 24 hours and just before power outages. To sign up, go to pge. com/ pspszipcod­ealerts

What about the coronaviru­s pandemic?

PG& E opens up community resource centers where people can plug in if they have lost power at home. Because of coronaviru­s concerns, they will generally be openair, generally in tents placed in parking lots, so customers can keep their distance from each other.

 ?? Noah Berger / Special to The Chronicle ?? Power lines are seen in Alameda. Customers throughout the region could face PG& E shutoffs intended to reduce the risk of a blaze that may be sparked by an electrical line or a piece of equipment.
Noah Berger / Special to The Chronicle Power lines are seen in Alameda. Customers throughout the region could face PG& E shutoffs intended to reduce the risk of a blaze that may be sparked by an electrical line or a piece of equipment.

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