Here are developments on the PG&E shut-off, up to 10:39 p.m. Wednesday. The most recent updates can be seen by clicking here.

11:10 p.m. National Weather Service warns of strong winds: The weather service’s Bay Area office said winds at Mount St. Helena reached 60 mph with gusts of 70 mph, and winds at Mount Diablo reached 54 mph with gusts of 68 mph at 11 p.m. Wednesday.

10:39 p.m. Second phase of shutoffs begin: Shutoffs began hitting East Bay, South Bay and Santa Cruz counties shortly before 11 p.m., according to Karly Hernandez, a PG&E spokeswoman. Utility crews will “continue deenergizing through midnight tonight,” Hernandez said.

10: 36 p.m. Shutoffs expected to begin in Contra Costa County: Pacific Gas & Electric Co. officials said shutoffs will begin for portions of Contra Costa County “at around 10 p.m.,” according to the Contra Costa County Sheriff’s Office.

10:26 p.m. Shutoffs for Alameda County delayed until midnight: Pacific Gas & Electric Co. shutoffs for Alameda County have “been moved closer to midnight,” according to the Alameda County Sheriff’s Office. Sheriff’s officials said they were observing “wind increases at higher peaks and elevations.”

10:10 p.m. Law enforcement officials await the looming shutoffs: Officials with the Alameda County Sheriff’s Office tweeted an image of law enforcement officers and emergency personnel seated around a table in the Alameda County Emergency Operations Center soon after announcing a “shift change” ahead of the planned outages in the Bay Area. They said that they were, “waiting for the power to go out like many of you” residents, inviting impacted customers to tweet their experiences once shutoffs begin rolling through the region.

10:00 p.m. National Weather Service warns of strong winds: The weather service’s Bay Area office announced that winds at Mount Diablo reached 47 mph with gusts of 56 mph shortly before 10 p.m. Wednesday. “Winds will increase as the night continues,” weather service officials said.

8:59 p.m. PG&E announces delay in next round of shutoffs for Bay Area: Bay Area shutoffs were delayed for an unknown amount of time on Wednesday night, said Jeff Smith, a PG&E spokesman. Smith said the utility will likely begin Bay Area shutoffs “later this evening,” but did not specify a time. The utility expected to release an update on the changes Wednesday evening.

Smith also said that PG&E officials are aware of reports of technical issues on its newly-launched website, and said “we expect to have a new website for customers to access. We’ve been working on a fix.”

8:19 p.m. PG&E’s new website is having problems already: Many users attempted to connect say they can’t load the page and are expressing frustrations online.

#PSPS: PG&E has established an alternate website for customers to check their address for potential impact by a power shutoff. Best access to the website is via Google Chrome, Mozilla Firefox, Apple Safari and Microsoft Edge (not Internet Explorer 11). https://t.co/MxmlBQyV9t — PG&E (@PGE4Me) October 10, 2019

8:15 p.m. PG&E launches new website: PG&E launched an alternative website for customers to check their address for potential impacts by the planned outages. Utility officials advised customers to access the new website using Google Chrome, Mozilla Firefox, Apple Safari and Microsoft Edge — not Internet Explorer 11.

7:40 p.m. National Weather Service warns of strong winds: The weather service’s Bay Area office announced that PG&E’s station located at Mount St. Helena recorded winds of 43 mph with gusts of 51 mph. Officials said the region will be one of the “indicator sites to watch” as winds are expected to increase overnight into Thursday morning. The area will likely record some of the top winds related to the weather event, officials said.

7:34 p.m. UC Berkeley will resume classes on Thursday if there is no power outage by early morning: The school said all staff members were expected to report to work if there is no outage, but told managers to be flexible if employees were dealing with outages at home.

7:30 p.m. Next round of outages to hit between 7-10 p.m.: PG&E said Bay Area communities can expect to lose power between 7 p.m. and 10 p.m.

7:26 p.m. PG&E says a total of 750,000 customers will likely be without power: The total count was reduced by 40,000 households and businesses from an earlier estimate.

6:44 p.m. PG&E to post estimated times of power restoration: The utility said at a news conference that it will begin posting estimated times of power restoration in the next 24 hours on its new website, which it has not yet unveiled.

6:39 p.m. Spotty cell service in Sonoma County: Sonoma County residents reported spotty cell phone service. AT&T said it would provide unlimited calls, texts and data and waive overage charges in the 758 ZIP code.

6:36 pm PG&E said next round of shut-offs is still planned for 8 p.m.: The utility said it will continue monitoring weather conditions in the Bay Area but those plans are not likely to change.

6:35 p.m. Marin water officials advise customers to reduce outdoor water usage immediately: Marin Municipal Water District said it’s “experiencing high water demands” and is “asking all customers to turn off irrigation and reduce indoor water usage immediately.”

6:15 p.m. PG&E creates new website after repeated crashes: Officials said at a news conference that they created a new website with updated maps that will allow customers to search by address to see if they are affected by outages. The move comes after numerous customers complained of repeated crashes and maps that were hard to read. PG&E said it will soon share the website address on social media.

6:13 p.m. PG&E reminds customers that restoration of power may be delayed: PG&E said after dangerous weather conditions end, inspections of power lines may take additional days, delaying power restoration.

6:08 p.m. Power restorations have begun for some. PG&E said that 44,000 customers out of the approximately 500,000 customers that lost power have had energy restored. Also, power could be restored to an additional 60,000 to 80,000 customers in the Humboldt area following inspections of a power line, an official said at a PG&E news conference.

6:07 p.m. PG&E said weather conditions are expected to calm by Friday, leading to possible power restorations: “We’re seeing some of the same conditions” on Wednesday that led to previous catastrophic wildfires, a PG&E official said at a news conference in San Francisco. Those conditions include wind speeds up to 50 miles per hour in Redding and red-flag fire warnings throughout Northern Califronia. But things should calm by Friday.

5:27 p.m. Kamala Harris says outages are “simply unacceptable”: The California senator and presidential candidate said that PG&E officials “need to be held responsible for the maintenance of their power lines” and told residents to heed warnings and be cautious.

4:08 p.m. Total homes and businesses affected by outages so far is 489,329: PG&E data shows this is how many customers are out — and each customer accounts for a home or business.

4:08 p.m. Officials confirm that someone shot at a PG&E vehicle: California Highway Patrol confirmed that a bullet hit a PG&E vehicle in Colusa County on Wednesday morning.

4:08 p.m. Oroville police increase security at a local PG&E office: Security was increased after an angry customer threw eggs at the window, a police dispatcher said. “The safety of our customers and employees is PG&E’s primary responsibility. We know that turning off the power for safety is not popular with some, but it is needed for public safety,” said Tamar Sarkissian, a PG&E spokeswoman. “We remind our customers that our employees are your neighbors and they are out in our service area doing their jobs”

4:08 p.m. Outages could cost billions: Economists estimate that the power outages could cost Northern California millions or even billions of dollars. Michael Wara of Stanford University said residential customers could be hit with $65 million in costs, and commercial customers could raise that total to $2.5 billion. Jesse Jenkins of Princeton said a five-day blackout could cost around $960 million.

3:46 p.m. San Jose city officials say outage could last 7 days, offer advice: City leaders said at a press conference that the outage will mostly affect east San Jose along the foothills and Almaden Valley. Officials urged people to commute home before 8 p.m. when power will shut off, avoid driving during the shut-off and stop at intersections without power. Police do not have enough staff to direct traffic at all major intersections. A city leader also instructed people to be “compassionate and kind” to PG&E employees.

3:15 p.m. NWS reports ‘bone-dry’ humidity levels: Much of Napa County had relative humidity levels that dipped below 10%. Check the map for more details. Red flag warning conditions — low humitidy and strong winds — continue and are expanding in the North Bay mountains, according to the weather service.

Bone-dry relative humidity (RH) values as of 2:45 pm PDT across areas in the Red Flag Warning. Much of Napa County is observing RH values at 10 percent or less. #CAwx #CAFire



View the RH map here ➡️ https://t.co/Tij84DAsJS pic.twitter.com/DtEnCCsoyX — NWS Bay Area (@NWSBayArea) October 9, 2019

2:56 p.m. San Jose declares state of emergency: San Jose officials declared a local state of emergency. Officials from the city’s Fire Department and Parks, Recreation and Neighborhood Services were dispatched to medical care facilities and medical baseline customers who PG&E had not been able to contact. City officials plan to brief the news media at 3:15 p.m.

2:36 p.m. Santa Clara County calls for state, federal emergency declaration. In a news conference Wednesday afternoon, David Flamm, deputy director of the Office of Emergency Management, called on “the state to also proclaim a state emergency and the federal government to declare a federal emergency, as well.”

More from Santa Clara County presser: Officials said the state of emergency proclamation in light of the shutoffs is one that, "asks the state to also proclaim a state emergency and the federal govt to declare a federal emergency as well.” — Tatiana Sanchez (@TatianaYSanchez) October 9, 2019

2:33 p.m.: Shut-offs in San Mateo County delayed until 8 p.m: Following an update from PG&E, San Mateo County officials said in an alert that blackouts won’t begin until 8 p.m. The outages are expected to last until noon Thursday.

2:33 p.m.: Shut-offs in San Jose delayed until 8 p.m.: Power shut-offs in San Jose have been delayed until 8 p.m., city officials said. They asked residents to try to return home before that time.

1:35 p.m. San Jose International Airport takes precautions: The airport isn’t affected right now, but it has an emergency plan in case the blackout extends. Staff have prepared with generators and they have a communication plan in place, an airport spokesperson told The Chronicle.

1:25 p.m. Possible shots fired at PG&E employee: California Highway Patrol officers are investigating possible shots fired at an PG&E vehicle as the employee was driving a marked truck Wednesday morning, authorities said. Just after 7:45 a.m., the worker reported he was traveling southbound on Interstate 5 just north of Maxwell in Colusa County when a possible white, Chevy-style pickup truck pulled up beside him, said Officer J. Sherwood, a California Highway Patrol spokesman. The employee thought he heard the sound of a gunshot just before a right-side window shattered, Sherwood said. No other witnesses were in the vehicle, and the case has been forwarded to CHP’s investigative unit.

1:17 p.m. PG&E sets up barricade at SF office: Company officials set up an L-shaped barricade in front of its San Francisco headquarters on Beale Street. Company spokeswoman Ari Vanrenen said the barricade is a precaution for “the safety of our employees.” She added, “We have received feedback from frustrated customers.”

1:13 p.m. Alameda County outages delayed until 8 p.m.: The Sheriff’s Office said the blackout was delayed because strong winds are expected to begin at about 10pm.

Important #PSPS update for Alameda County. The power shut off for our county has been delayed for several hours. It will now begin at 8pm. Strong winds are expected to begin about 10pm. Power restoration for Alameda County will begin on 10/10 about 12pm. Info subject to change. pic.twitter.com/VyLNx5YUzz — Alameda County Sheriff (@ACSOSheriffs) October 9, 2019

1:06 p.m. Morgan City declares curfew: Morgan City officials said there will be a curfew from 7 p.m. Wednesday to 6:30 a.m. Thursday. “The curfew is intended for pedestrians loitering in areas impacted by the power shutoff. This curfew is for the safety of the community to reduce the opportunity for crime. Travel by vehicle and presence on one’s own residential property is fine. Please note that checking on neighbors is not considered loitering,” authorities said in a statement.

1:06 p.m. Contra Costa County officials say shutoff delayed until 8 p.m.: County officials said in a tweet the shut-offs had been delayed for unspecified reasons.

Power Shut Off Update -- Planned shut offs for Contra Costa County have been delayed to begin at 8 pm tonight. Fire danger remains high, please be ultra cautious in ALL outdoor activities & report any fires to 911 immediately. For more: https://t.co/jyPQ2XETQm — Con Fire PIO (@ContraCostaFire) October 9, 2019

12:54 p.m. Shut-offs delayed by change in weather: PG&E said power shut-offs will begin this afternoon and into the early evening in the following counties: Alameda, Alpine, Contra Costa, Mariposa, San Joaquin, San Mateo, Santa Clara, Santa Cruz, Stanislaus, and Tuolumne. PG&E originally said these counties would lose power around noon.

12:49 p.m. Santa Clara County proclaims state of emergency: Officials announced they are filing a local state of emergency declaration because of the power shut-offs. A news conference is scheduled for 1:30 p.m.

The PG&E power shutoff event is starting now and will affect large areas of the County, including Bay Point, Canyon, El Sobrante, Kensington, Lafayette, Moraga, North Concord, Orinda, Pleasant Hill, Pinole, Pittsburg, Richmond, San Ramon and Walnut Creek. — Contra Costa County (@CCCounty) October 9, 2019

12:37 p.m. San Mateo County anticipates 15,000 customers outages. San Mateo County officials said they expect 15,000 customers and 262 medical baseline customers to be affected by power cuts in the southern and coastal areas of the county. The shut-off will likely last until noon Thursday, officials said.

12:32 p.m. Alameda County expects shut-offs to start later than planned: Sgt. Ray Kelly, of the Alameda County Sheriff’s Office, told The Chronicle that blackouts will likely now start at 1 p.m. — instead of noon — and continue across the county for another four to five hours.

12:30 p.m. Sen. Bill Dodd slams PG&E: The state assemblyman from Napa called the blackouts “beyond frustrating” in a statement on his website. “Public safety power shutoffs have a role to play when they’re needed to prevent massive wildfires and the huge human and economic costs we’ve seen in recent years. However, many of my constituents are disturbed that the power was shut down before the winds started to pick up in the North Bay. For years PG&E has done a poor job on maintenance and tree clearing, and they’re still not even close to where they need to be. That fact, along with breakdowns in communication, are unacceptable. Sadly, poor performance by PG&E is par for the course, so it’s not surprising.”

12:22 p.m. Several injured in Santa Rosa car crashes: Authorities in Santa Rosa said they have responded to multiple car crashes, including five that injured people, at intersections without power. Authorities have asked drivers to slow down and treat intersections without power like four-way stop signs.

12:05 p.m. National Weather Service records increasing wind speeds: Winds were gusting 32 mph at 2,400 feet in the hills east of Healdsburg. A peak gust of 47 mph was recorded at Mount Diablo. Wind speeds are expected to increase throughout the day.

WIND UPDATE:

Winds beginning to ramp up in the North bay mountains. At 2400 feet in the hills east of Healdsburg winds gusting to 32 mph. Winds will continue to increase through the day and peak overnight tonight. #CAwind — NWS Bay Area (@NWSBayArea) October 9, 2019

12 p.m. The Chronicle’s power outage map: PG&E officials anticipate the second wave of power outages to begin at noon. This phase will impact service to approximately 234,000 customers in the following counties: Alameda, Alpine, Contra Costa, Mariposa, San Joaquin, San Mateo and Santa Clara. Here is a map built by Chronicle staff, which uses the same data PG&E relies on for their official maps.

11:54 a.m. Muir Woods National Monument, other parks closed: Restrooms, services, parking and facilities are closed, according to Muir Woods’ website. Reservations will be refunded in full. Marin Headlands Visitor Center, Muir Beach and Overlook, and Stinson Beach are also closed. Redwood National and State Parks will have limited service and closed facilities in some parts.

11:45 a.m. South Bay blackouts coming soon. San Jose expects shut-offs between noon and 5 p.m., city officials said. Areas of East San Jose along the foothills and South San Jose around Almaden Valley are expected to be primarily affected.

11:21 a.m. Caldecott Tunnel will get a permanent generator — in 2020: Caltrans officials said they purchased a $6 million generator in June, but it won’t be online until the spring.

Caltrans ordered permanent generator for $6M in June, but not online until next spring; tunnel needs certain features to be operational to remain open pic.twitter.com/ViRkmv12tp — Matthias Gafni (@mgafni) October 9, 2019

11:18 a.m. PG&E is sorry: The company issued an apology on Twitter for its website issues.

We are experiencing a high volume of traffic to our website & understand your frustration w/ the delay of accessing #PSPS related web pages. We apologize for the inconvenience and thank you for your patience. Our team is working as quickly as possible to restore access. pic.twitter.com/GWHF5VVvHZ — PG&E (@PGE4Me) October 9, 2019

11:13 a.m. California governor’s office releases statement: The office’s twitter account sent out a thread quoting Gov. Gavin Newsom on the reasons for the PG&E power outages.

Governor @GavinNewsom's statement on the utility #poweroutage:



(1/4) "My office is actively working with @Cal_OES and across the administration to provide support to local communities affected by these Public Safety Power Shutoffs." — Office of the Governor of California (@CAgovernor) October 9, 2019

10:45 a.m. PG&E website still having issues: PG&E tried to prepare for heavy online traffic Wednesday by doubling its server capacity before the shut-offs took effect, but the website still buckled under the weight of seven to eight times its normal traffic on Tuesday, company officials said. PG&E spokesman Matt Nauman told The Chronicle the company’s website is “still having issues.”

10:40 a.m. Caldecott Tunnel to remain open: Officials made the announcement at a press conference while generators were being set up.

10:15 a.m. Oakland zoo closes; museum offers WiFi, phone charges: The Oakland zoo has announced that it closed to the public ahead of an expected power shut-off. The animals are being cared for by staff. However, the Oakland Museum of California will remain open and is offering public WiFi and phone charging stations.

Due to power outage Oakland Zoo is *closed* today, Wednesday October 9th.



Our animals are being cared for by our Animal Care staff :) pic.twitter.com/CutbPCifsE — Oakland Zoo (@oakzoo) October 9, 2019

We have the following free amenities: public WiFi throughout campus, restrooms and drinking fountains on all levels, water bottle refilling station, and mobile phone-charging stations near the café. The café will also be open. — Oakland Museum of California (@oaklandmuseumca) October 9, 2019

10:13 a.m. Crews working to maintain power at Caldecott Tunnel: Signs leading up to the tunnel say it might shutdown at noon, which is when the shut-off starts in the East Bay.

You can see crews working on the generators; signs leading up to tunnel say the Caldecott MAY shutdown at noon which is when the #PGEpowershutdown starts in East Bay@rachelswan @Josh_Koehn @sfchronicle pic.twitter.com/DWqFJjh3KY — Matthias Gafni (@mgafni) October 9, 2019

10:10 a.m. Power rerouted to keep Devil’s Slide tunnel open: Caltrans and PG&E officials rerouted power to keep the Devil’s Slide tunnel on Highway 1 open when power is expected to go down between noon and 1 p.m, officials said.

9:50 a.m. Customers with medical conditions affected in Bay Area tops 8,000: PG&E shut-off reports for Bay Area counties currently note 8,424 medical baseline customers in the region who will be affected by the outages. These customers have special energy needs due to qualifying medical conditions such as multiple sclerosis, sleep apnea or a life-threatening illness. These customers are supposed to receive extra notification ahead of planned outages.

9:35 a.m. Alameda County announces power shut-off plans: The county expects 32,680 customers to lose power starting around noon as part of the second round of the PG&E shut-off, according to the Sheriff’s Office. The process will likely take until 5 p.m. to complete. No word was given on when power might be restored.

#PSPS update for Alameda County. Power Shutoff for affected Alameda County Cities to begin about 12pm. This shut down process will take several hours and likely be completed about 5pm when high winds will begin. Stay tuned for updates as we approach the noon hour. pic.twitter.com/DBMX8pShGI — Alameda County Sheriff (@ACSOSheriffs) October 9, 2019

8:45 a.m. Contra Costa County residents stock up on gas: A gas station in Moraga ran out of gas and propane after people flocked to the station in preparation for the outage.

Stars Gas in Moraga ran out of gas at 8 pm Tuesday night; also out of propane; Jose, the cashier has spent the morning alerting drivers they’re out of luck pic.twitter.com/57NP3EImqv — Matthias Gafni (@mgafni) October 9, 2019

8:42 a.m. Sen. Wiener says 2.5 million people affected by shut-off: “It’s hard to overstate the impact of this massive rolling blackout, affecting 2.5 million people,” Sen. Scott Wiener said in a statement Wednesday morning. “People rely on electricity for their medicine, their food, and their livelihood. This is a completely unacceptable state of affairs. While targeted blackouts can help prevent wildfires, we can’t let PG&E normalize these blackouts.”

8:37 a.m. Napa residents stock up during shutoff:

Residents in Napa stocking up on ice & water at Nob Hill foods near Silverado Trail. Many without power are frustrated over the PG&E shutoff. 2 years ago, this area was ravaged by the Atlas Fire pic.twitter.com/jTjs1M0yZH — Evan Sernoffsky (@EvanSernoffsky) October 9, 2019

8:30 a.m. Contra Costa County to lose power before noon: Officials said parts of the county are expected to lose power between 10 a.m. and noon Wednesday, earlier than previously planned like other parts of the Bay Area. The outage is expected to last through Thursday at noon, officials said.

PG&E Public Safety Power Shut Offs now expected to take place between 10 am and noon TODAY. See map below for locations. More at https://t.co/oizyHjUUFX & https://t.co/aT5ERhpnNG. Red Flag fire weather continues into evening with dangerous winds, low humidity -- high fire risk! pic.twitter.com/5P7hykXBDv — Con Fire PIO (@ContraCostaFire) October 9, 2019

8:29 a.m. BART power problems, delays not related to shut-off, agency says: A power problem on a BART track caused 20-minute delays on the Antioch Line in the Antioch, SFO, Montgomery and Pleasant Hill directions. Transit officials said the power problem was a track-side issue and not related to the planned power outages.

8:15 a.m. Blackout creates traffic crunch in Napa: Severe backups have snarled traffic in Napa as traffic lights at major intersections are out, including intersections Highways 29 and 12 near the Napa airport.

Severe backups around Napa county as traffic lights at major intersections are down. Here’s the hwy 29 & 12 intersection near the Napa airport pic.twitter.com/5reEBa965h — Evan Sernoffsky (@EvanSernoffsky) October 9, 2019

7:49 a.m.: Caltrans optimistic about Caldecott Tunnel: Crews worked through the night to install generators at the Caldecott Tunnel that will be needed to keep the four bores open when power shuts down around noon Wednesday. Caltrans said it was optimistic the work would be done in time. “It’s a fluid situation,” a spokesman said.

7:30 a.m. Weather service issues ‘extreme’ fire outlook: Parts of Northern California are under an extreme fire outlook through Wednesday, according to the National Weather Service. More than 6,000 acres and 280,000 people are included in the area. Vacaville, Clearlake and Red Bluff are the largest cities in the risk area.

Storm Prediction Center has portions of the North Bay and Northern California in it's rare "Extreme" Fire Wx Outlook for later today. #CAwx #OneLessSpark #FireWeather #RedFlagWarning pic.twitter.com/e20yAzGdP3 — NWS Bay Area (@NWSBayArea) October 9, 2019

7:13 a.m. San Jose expects noon blackouts: PG&E officials expect to shut off power in San Jose around noon, city officials said at a news conference. Officials have set up three resource centers for residents, at the Camden, Mayfair and Southside community centers.

6:49 a.m. Map shows power shut-offs across the region. The Chronicle created a power outage map to help residents across the region access up-to-date information.

6:18 a.m. Winds starting to turn offshore, pick up: Winds in the North Bay and East Bay hills are increasing slightly and beginning to turn toward the coast, according to the National Weather Service. Winds are expected to ramp up through Wednesday night with gusts up to 55 mph, and up to 65 mph at the highest peaks like Mount Saint Helena and Mount Diablo.

5:45 a.m. Blackouts hit Sonoma County hardest: A PG&E spokeswoman told The Chronicle that 67,000 residences and businesses in Sonoma County lost power between midnight and 4 a.m. as the company preemptively cuts power across the region. Napa County had 32,750 customers lose power, while Solano County cuts totaled 31,630. Marin County outages stood at 10,183.

5:37 a.m. More than 140,000 without power in North Bay: PG&E completed the first phase of power outages at 4 a.m., leaving 141,563 customers without power in Marin, Napa, Sonoma and Solano counties, according to PG&E. A total of 513,000 customers, the rest in Northern California and the Sierra, have been shut off.

4:45 a.m. Shut-offs taking place in three phases: PG&E began shutoffs at midnight in Northern California and the North Bay counties, while the rest of the Bay Area is scheduled to begin losing power in waves at noon. A possible third phase will occur later in the day in the southernmost parts of the PG&E service area in the San Joaquin Valley and Central Coast.

4:35 a.m. Devil’s Slide tunnel to stay open: The Devil’s Slide tunnel on Highway 1 in San Mateo County will be unaffected by the power outage, Caltrans officials said.

4:30 a.m. Caltrans installing generators at Caldecott: Caltrans officials said they’re installing generators at the Caldecott Tunnel to make sure all four bores can remain open when power shuts down at noon. They expect to have the generators installed by noon.

4:27 a.m. More outages expected by noon: Power is out in parts of Marin, Sonoma, Napa and Solano counties, and more outages are still planned for the rest of the Bay Area, excluding San Francisco County.

4:14 a.m. Caldecott and Lantos tunnels to remain open: Caltrans officials announced that the Caldecott Tunnel on Highway 24 in Contra Costa and Alameda counties, as well as the Tom Lantos Tunnel along Highway 1 in Pacifica, will not be affected by the power shut-off.

2:55 a.m. Blackout hits Napa County: More than 6,000 customers in Napa County lost power, including in Cuttings Wharf and just north of the Napa County Airport.

2:11 a.m. Blackout hits Sonoma County: More than 10,000 customers in the Sonoma County area lost power, including the areas of Schellville, Boyes Hot Springs and the Jack London State Historic Park. In Rohnert Park, more than 2,000 customers were without power.

1:12 a.m. Blackout hits Marin County: Nearly 600 customers in the Golden Gate National Recreation Area and Tamalpais-Homestead Valley areas lost power.

12:52 a.m. Blackout hits Solano County: More than 5,000 customers north of Fairfield lost power due to the planned shut-off just after midnight despite PG&E’s assurance that the outage would not hit the Bay Area until noon.

9:43 p.m. Caldecott tunnel, Devil’s Slide to stay open: Caltrans said in a tweet that both tunnels would remain open during the shut-offs.

9:24 p.m. Bay Area blackout won’t begin until noon: PG&E says the power shut-offs will not happen all at once on Wednesday. The company will implement one round of shut-offs, starting in the northern part of the state, from midnight until 4 a.m. Another round will black out neighborhoods starting at noon as the weather shifts toward the Bay Area.

7:09 p.m. Water districts want customers to store water: East Bay Municipal Utilities District, which delivers water to 1.4 million customers in Alameda and Contra Costa counties, and other water providers, including Marin Municipal Water District, are asking customers in affected areas to store a minimum of two gallons of water per person per day — enough to last three to seven days — and to store extra for pets. Although the districts have back-up generators for water pumping and distribution, services could be affected.

6:02 p.m. Caltrans plans to fully close the Caldecott Tunnel: All four bores of the tunnel running on Highway 24 will be closed due to the outage. The tunnels cannot operate without power, Caltrans said. “The tunnel closures can begin as soon as this evening and continue for as long as five days,” officials said.

5:58 p.m. BART escalators may be affected: BART officials said the agency anticipates no train service disruption due to the power shut-offs, although some stations may have escalator outages.

5:54 p.m. Golden Gate Bridge District officials say bridge, services won’t be affected: The district says it has backup generators at its service locations so that the Golden Gate Ferry, Golden Gate Transit and the Golden Gate Bridge should not be affected by any power outage.

5:27 p.m. Mills College cancels Wednesday and Thursday classes: Mills College officials canceled classes scheduled for Wednesday and Thursday because of the power outages.

5:21 p.m. UC Berkeley cancels Wednesday classes: UC Berkeley officials said all classes will be canceled on Wednesday because PG&E officials informed them “most of the core campus will be without power starting at approximately 8 a.m.” Campus officials are monitoring information and conditions as they decide whether to have classes on Thursday and Friday. Students can sign up for text alert updates or check for updates on the school’s information web page.

Michael Cabanatuan, Alejandro Serrano, Anna Bauman and Roland Li are San Francisco Chronicle staff writers. Email: mcabanatuan@sfchronicle.com, alejandro.serrano@sfchronicle.com, anna.bauman@sfchronicle.com, roland.li@sfchronicle.com Twitter: @ctuan @serrano_alej @abauman2 @rolandlisf