East Sussex Fire and Rescue Service said it was called at 6pm to the fire and work was carried out to isolate utilities as gas was continuing to burn. No injuries were reported but nearby buildings were evacuated and a cordon was put in place.
A council spokesman said it had quickly established a rest centre nearby at the Brighton Centre where support was provided to the evacuated people.
The fire service handed the scene over to Sussex Police just after 1am this morning (January 26).
A fire service spokesman added: "The cause hasn't been confirmed however it's being treated an electrical fire.
"We would like to thank everyone for their patience and our partners, including Sussex Police, the local authority and power companies for working alongside us."
One lane of Kings Road remained closed today (Wednesday).