A fire broke out at the Tees Valley energy-from-waste plant on Sunday (31 August) morning damaging plant and electrical wiring.
Ten fire engines initially attended the fire, which started at around 1.10am. The fire was under control by 2am and two fire engines stayed at the plant until 9.30am.
The plant is owned and operated by Sita UK.
Sita UK regional manager Julie Craigie said: We are still investigating the cause of the fire, which shorted some electrical and hydraulic equipment in the backroom area of the facility.
The fire was not in an area where waste was stored and at no time was there any danger that the waste storage area would be affected.
No injuries were caused by the fire and Sita is currently awaiting engineers reports about the level of damage and its impact on operations.