The fire broke out around 3 a.m. Wednesday at Rancho Road and only burned about one acre before it was extinguished, according to the Ventura County Fire Department.
The man who was detained was not identified but was being questioned about the fire. Additional details about the circumstances surrounding the fire were not immediately available.
This comes as a heat wave continues to grip Southern California.
Some SoCal communities see record temperatures amid heat wave
The California Independent System Operator says it should have enough electricity to meet demand and avert outages. But disruptions such as wildfires that burn transmission lines or other unexpected problems could lead to the first "Flex Alert" of the year.
Officials say that if an alert is called, people would be asked to voluntarily cut electricity use from 4 to 9 p.m. Wednesday and Thursday.
The Associated Press contributed to this report.