"Crews in a remote area with risky terrain were performing restoration work when a crew member suffered an accident and a fatal injury in western Shasta County", PG&E spokesman J.D. Guidi said Sunday morning.
"Tragedies bring people together", he added.
Two firefighters have been killed there since a fire erupted just west of Yosemite in the Sierra National Forest. It has destroyed 1,567 homes and other structures and blackened 133,924 acres (54,197 hectares), making it the sixth most destructive California wildfire on record.
The Mendocino Complex is two fires, the Ranch and River, which have burned in separate directions for days. "We're dealing with it humanly, financially and governmentally", said Governor Brown earlier today during a media briefing at the Carr Fire Incident Command Post in Anderson, California.
Forecasters said the highest threat areas included the so-called Carr Fire near the city of Redding and the Mendocino Complex of two fires north of San Francisco.
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The so-called Carr Fire was 41 percent contained after killing six people and incinerating 1,067 homes.
The fire has reached into remote areas of the country's third-oldest national park.
Yosemite Valley residents must leave the valley by noon Friday, National Park Service officials said.
Both areas remained under a "red flag warning" issued by the National Weather Service for strong winds, low relative humidity and temperatures topping 90 degrees Fahrenheit (32 degrees Celsius), all conditions that can drive the growth of wildfires.
Two firefighters and four other people have been killed since the blaze, which ignited July 23, raced with extraordinary fury toward the region's largest city.
"It looks like there's dicey weather on the way", LaBoa said. They have grown to a combined 300 square miles (648 kilometers). The fire rapidly swept down the hillside, as the 747 bomber, DC10 and the C-130 planes doused the area with retardant, followed up by continuous water by helicopters. Fire officials said another 8,000 homes and other buildings were threatened - down from about 12,000 homes initially threatened as firefighters made progress in some areas even as the blaze expanded in others. The twirling tower of flame reached speeds of 143 miles per hour (230 kph), which rivaled some of the most destructive Midwest tornados, National Weather Service meteorologist Duane Dykema said. The whirl uprooted trees and tore roofs from homes, Dykema said.
Brown, who inspected neighborhoods wiped out by a wildfire in the Northern California city of Redding, said Saturday that he was confident the president he has clashed with over immigration and pollution policies would send aid, which Trump did past year when California's wine country was hit hard.