On Wednesday, Police officers guarded a cordon around the scene and Northern Powergrid staff were also on site.
Cleveland Fire Brigade said it had sent six fire engines and the Incident Command Unit.
At 13:30 BST it confirmed the fire had been extinguished, but one engine remained on “proactive standby”.
A spokesperson said road closures were in place and asked members of the public to avoid the area where possible.
They also said the “tragic incident” was being jointly investigated by the fire service and Cleveland Police.
Cleveland Police said it was “keeping an open mind and cannot rule out any links to wider organised crime at this time”.
The fire happened about two miles from the A66 crash that killed five young men and two police officers on Saturday morning.
Redcar and Cleveland Local Policing Commander Supt Emily Harrison said the force was working to “establish the circumstances of exactly what has happened”.
“We will have a high visibility presence in the Grangetown area and encourage anyone who has concerns, or who may have information, to approach our officers.”
Patrols had been increased in the local area to “reassure the local community”, the force said earlier.
Grangetown councillor Adam Brook urged people not to speculate or share unconfirmed information.
Redcar MP Anna Turley said the community had faced a “profound amount of heartbreak over the past few weeks” and expressed her condolences to the loved ones of those who died and were injured.
The families of the people involved have been informed and are being supported by specialist officers.
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