A Northern California wildfire that killed four people and destroyed more than 200 buildings last year was sparked when tree branches came into contact with Pacific Gas & Electric power lines, officials said in a report.

Investigators with the California Department of Forestry and Fire Protection seized equipment belonging to PG&E in the weeks after the Zogg Fire tore through rural communities in Shasta and Tehama counties last September and October.

Sonoma County officials say they will add artificial intelligence technology to help fight wildfires with a 24-7 monitor to track fire outbreaks.

The technology will be added to the county’s network of wildfire detection cameras that monitor California’s backcountry to spot the first outbreak of flames. Many of the cameras are affixed to existing radio communication towers.

“This early detection technology will provide emergency managers and first responders with round-the-clock monitoring, a sophisticated addition we are excited to add to our alert and warning toolkit,” Sonoma County Board of Supervisors Chair Lynda Hopkins said.

California Insurance Commissioner Ricardo Lara on Monday announced a new partnership between the California Department of Insurance and Gov. Gavin Newsom’s Administration to establish statewide standards for home and community hardening aimed at reducing wildfire risk, protecting lives and property and making insurance available and affordable to residents and businesses.

California Insurance Commissioner Ricardo Lara is alerting residents to review their current insurance policies in the midst of a forecast of winter weather bringing the possibility of floods, mudslides, debris flows, and other disasters to recent wildfire burn areas throughout the state.

Lara issued a formal notice to insurance companies reminding them of their duty to cover damage from any future mudslide or similar disaster that is caused by recent wildfires that weakened hillsides.

Predictive modelers told California regulators on Thursday that the state’s antiquated rules for calculating wildfire risk when setting property insurance rates discourage innovative mitigation measures that could ultimately reduce losses.

Nancy P. Watkins, a principal and consulting actuary for Milliman, said during a webcast on “home hardening” hosted by the state Department of Insurance that California is one of only three states that doesn’t allow insurers to use catastrophe modeling to determine wildfire risk. Rates must be based on historical losses.

Watkins said that is a “very simple” method of ratemaking. “It’s kind of like expecting the Rocky Mountains to be flat because we just drove through Kansas and Missouri,” she said.

The California Public Utilities Commission has raised concerns over certain deficiencies that it says could affect PG&E Corp.’s ability to provide safe and reliable service, the power provider disclosed in a regulatory filing on Wednesday.

The regulator, in a letter dated Tuesday, said it will require remediation on specific issues identified in the San Francisco-based utility’s wildfire mitigation plan progress reports.

Harvest season in Northern California’s wine country is what dream weddings are made of: ripe grapevines and golden sunsets provide ceremonies an alluring backdrop that every year draws millions of visitors.

But harvest season now overlaps with fire season as wildfires, too, have become a yearly reality in the region.

In three of the past four years, major wildfires driven by a changing climate have devastated parts of the world-famous region, leaving little doubt that it’s vulnerable to smoke, flames and blackouts in the fall.

Crews tried to beat back two out-of-control wildfires in Southern California on Tuesday that have kept tens of thousands of people out of their homes.

Fierce winds that drove twin fires through brushy hills near cities in Orange County a day earlier were expected to pick back up, although not to the earlier extremes, according to the National Weather Service.

Southern California Edison reported to regulators that it was investigating whether its equipment might have sparked the Silverado Fire near the city of Irvine. The utility said a wire that lashed a telecommunications line to a supporting cable may have struck a 12,000-volt conducting line above it.

Large swaths of California had no electricity Monday as utilities tried to prevent the chance of their equipment sparking wildfires while the fire-weary state was buffeted by powerful winds and dangerously dry weather conditions.

About 300,000 power customers, more than 1 million people, were in the dark as officials issued warnings for what could be the strongest winds for California this year.

North of San Francisco, a Mount St. Helena weather station recorded a hurricane-force gust of 89 mph late Sunday and sustained winds of 76 mph.

PG&E Corp. prioritized meeting inspection targets over meaningful reduction of wildfire risk, according to a monitor overseeing the utility’s program of trimming trees and vegetation that pose a threat of igniting devastating blazes in California.

Among the court-appointed compliance monitor’s findings: The company failed to conduct detailed climbing inspections of 967 transmission structures located in high-fire risk areas before the start of peak wildfire season. Wind damage to one such tower was the cause of the state’s deadliest fire, which killed 85 people and destroyed the town of Paradise.