Firefighters were called when smoke was seen coming from a drain in York.
It happened at 10.57pm last night (Wednesday).
A North Yorkshire Fire & Rescue Service spokesperson said: “A crew from York responded to reports of smoke issuing from a drain in the street.
“This was smoke issuing from an electrical installation, under the pavement.
“Crews cordoned off and made the scene safe, before handing the incident over to Northern Power Grid, who isolated the power.”