TILBURY, ENGLAND - A massive fire shut down what is billed as the largest wood biomass power station in Europe on Monday morning.

Investigators were continuing to determine what triggered the blaze that they believe started on a conveyor belt and spread to two huge biomass storage hoppers, according to the Southend Standard.

More than 120 firefighters battled the blaze with a special foam and also helped thousands of tons of wood pellets used as fuel to generate power. Firefighters were expected to remain on the scene for days to come to prevent the smoldering ruins from reigniting.

The plant, which was converted from coal to 100 percent biomass, reportedly employs 230 people. It was scheduled to be decommissioned in 2015.

A spokesman for RWE power, owner of the power plant, told the Standard that it was uncertain when the plant would be operational but that customers did not have to worry about power stoppages.