Wood fuels account for 40-60% of the combustion. UPM's Pietarsaari Factories supply bark from pulpwood and sawlogs and is the largest single provider.
Most of the rest of the wood-based fuel consists of logging residues from the region's forests. Rice, tops and branches are made into bales of springs in the forest and crushed by a slow-speed crusher at the power plant. Stumps are crushed either at the power plant or at an earlier stage in the supply chain. Wood that is not good for mass production is also included in the fuel mix.
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