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Using bio-fuels efficiently
Bio-fuels are considered to be CO2-neutral in the Kyoto process. At many Stora Enso mills, bio-fuels account for high proportions of total energy consumption; notably at the integrated Varkaus Mill (82%), and Skutskär Pulp Mill (94%). Bio-fuels accounted for 60% of the Group's total annual fuel consumption for energy processes in 2001 – a reduction from the previous year (64%). One reason for this is the use of fossil fuels for intermittent energy production due to production curtailments.
Internal energy flows, especially from chemical pulp mills, can be exploited most efficiently where a sawmill, pulp mill and paper mill are located together. Bark and other bio-fuels from sawmills can also be directly utilised in power plants. The energy-efficiency of this type of integration means that less energy is needed to produce a tonne of paper or board.
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