An estimated 37,300 customers were without power as of 2:39 a.m. local time (5:39 a.m. ET) on Tuesday across the state, according to Poweroutage.US.

Pacific Gas and Electric Company saw the largest number of customers without power. An estimated 17,910 of its 5.5 million customers were without power.

Southern California Edison had nearly 6,800 of its 3.4 million customers also cut off.

The PowerOutage.US map shows that over 10 percent of customers in the county of Siskiyou were without power early Tuesday morning.

Other counties most notably impacted included Santa Clara, San Benito, Alameda, Solano, Nevada, Contra Costa, Los Angeles and Riverside.

The Pacific Gas and Electric Company website has also provided its own map regarding outages for its customers.

The map shows how multiple areas in the Santa Clara, Alameda and Contra Costa counties were impacted by the outages as well as other areas.

The website also said that the provider could conduct Public Safety Power Shutoffs (PSPS) in response to severe weather.

“For public safety, we may turn off electricity when gusty winds and dry conditions, combined with a heightened fire risk, are forecasted. When possible, we will email, phone or text customers who will be impacted before we turn off the power,” the website read.

At the time of writing there are no PSPS scheduled.

The Southern California Edison website has also provided its own map regarding impacted customers. It indicated that more customers were actually impacted by power cuts than in PowerOutage.US’s estimates.

The website said that there were an estimated 101 outages and over 10,955 customers impacted.

The Independent System Operator (ISO), which runs the electricity grid in California, declared a Stage 2 emergency alert effective 6:30 p.m. Monday, according to a Sacramento Bee report.

The ISO also declared a “transmission emergency” for northern California Monday evening. It added that it needed to “relieve overloads in the Palermo area” of Butte County.

“We have now entered the most intense phase of this heat wave. The potential for rotating outages has increased significantly.” Elliot Mainzer, president and CEO of the ISO, said according to the report.

By 6 p.m. Monday evening, power consumption had surpassed the expected peak of 48,961 megawatts, according to the Sacramento Bee. The paper added that Tuesday could see a peak demand of 51,144 megawatts, which would break a 16-year-old record for energy use in California of 50,270 megawatts.

We are on razor thin margins," the vice chairman of the California Energy Commission, Siva Gunda, told the Sacramento Bee.

Newsweek has contacted Pacific Gas and Electric Company and Southern California Edison for comment.

Update 09/06/2022, 1.30 p.m. ET: This article was updated with a figure for the record for power consumption.