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The Electra Fire in Amadaor County exploded to more than 3,000 acres overnight

The Electra Fire burning southeast of Jackson in Amador County grew to more than 3,000 acres overnight, Cal Fire officials said Tuesday morning.

The fast-growing wildfire that broke out on Monday near Box Beach was still 0% contained while threatening 450 buildings. The fire was measured at more than 900 acres Monday evening, with Cal Fire noting the blaze was growing “at a dangerous rate.”

Cal Fire said Wednesday there was an ongoing threat to critical energy infrastructure and added that steep, rugged terrain made it difficult for fire crews to access the South Fork of the Mokelumne River drainage.

Residents in Amador County and in the area of ​​Butte Mountain Road have been put under a mandatory evacuation, according to the Amador County Sheriff’s Office. A mandatory evacuation for all residents within a 2-mile radius around Lake Tabo was also issued by Cal Fire.

A firefighter battles flames from the Electra Fire in Mokelumne Hill, in Calaveras County, Calif., Monday, July 4, 2022.

Ethan Swope/The Chronicle

About 100 people were safely evacuated from a Pacific Gas and Electric Co. facility. on Monday after fleeing the fast-growing fire, according to Amador County Sheriff Gary Redman.

A PG&E spokesman said about 15,000 people were without power in Amador and Calaveras counties as a result of the fire. The company also has “a number of assets potentially at risk,” the spokesman said.

The Amador County Sheriff’s Office did not immediately respond to inquiries about how many people had been evacuated as of Tuesday morning.

Map showing areas of Amador County under mandatory evacuation orders due to the Electra Fire.

Amador County Sheriff’s Office

Caltrans said State Road 26 is closed both eastbound and westbound, from Buckeye Lane to Lower Dorray Road.

Firefighters battle the Electra Fire in Mokelumne Hill, in Calaveras County, California, on Monday, July 4, 2022.

Ethan Swope/The Chronicle

One first responder was injured fighting the fire. The cause of the fire remained under investigation Tuesday, according to Cal Fire.

Track fire size and movement with The Chronicle’s California Fire Map and Tracker.

Jordan Parker (he/him) is a staff writer for the San Francisco Chronicle. Email: jordan.parker@sfchronicle.com. Twitter: @jparkerwrites.