The Idaho Department of Lands found that Boise-based Idaho Power was responsible for the nearly 10,000-acre Valley Fire after a downed pole sparked a fire in the dry grassland of the Boise Foothills, according to a news release from Idaho Power. The fire threatened homes in Southeast Boise’s Barber Valley, but did not reach them.

The department said on X, formerly Twitter, that crews were conducting “proactive fire operations” so they could protect the containment lines that had been set up around the growing Valley Fire. Boise Fire said it appreciated the “concerned calls” but wanted to assure residents they weren’t seeing a change in the fire’s behavior toward the city.