Firefighters on Wednesday afternoon contained a grass fire in Wilton that stretched approximately 520 acres, Metro Fire of Sacramento said in a tweet.
The blaze was burning between Dillard Road and the Cosumnes River, according to Sacramento Metropolitan Fire District spokesman Chris Vestal.
As the fire began in a relatively rural area, Vestal said he didn't expect evacuations would be necessary. Firefighters were working to prevent flames from reaching the Sacramento Municipal Utility District's solar panel plant in Dillard, he said.
The fire began around 1:45 p.m, Vestal said. Its cause has not yet been determined.
The Wilton Fire Department, Herald Fire Department, Cosumnes Fire Department and Sacramento County Sheriff's Department were assisting the operation.
SMUD initially referred to the blaze as the Tessie Fire, but it was renamed the Simpson Fire.
This is a breaking news story. Please check sacbee.com for updates.