State investigators concluded that power lines owned by Pacific Gas & Electric played a significant role in sparking the monstrous Dixie Fire.
According to the Cal Fire, the state's fire protection agency, the Dixie Fire ignited after a tree made contact with PG&E electrical distribution lines.
The sprawling blaze raced through five counties, Butte, Plumas, Lassen, Shasta, and Tehama, burning 963,309 acres in Northern California.
More than 1,300 structures were destroyed as crews fought to contain the flames, investigators said.
Many consider Dixie the biggest single-source fire in state history because 2020's massive 1,032,648-acre August Complex was a "complex fire," made up of lightning-sparked blazes.