Santa Rosa police received word at 12:23 p.m. that a tree or part of a tree had fallen onto a home in the 2700 block of Brush Creek Road, Sgt. Lisa Banayat said.
There was also word that the tree had taken down power lines, causing an outage. Banayat said PG&E was responding.
No injuries have been reported, she said.
Brush Creek Road has been blocked off, and the damage to the home is being evaluated, Banayat said.
PG&E spokeswoman Jana Morris said the outage initially affected 1,739 customers. "Now we've been able to restore all but 188," Morris said.
One of those 188 customers is Wendy Tigner, who lives up the street from where the tree fell.
"I'm here without any power right now," Tigner said shortly before 2 p.m.
She said she could hear chainsaws in the distance and that she was about to walk down the street to see when she might get her electricity back.
Morris did not yet have an estimate of when power would be restored.