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Long-distance transportation of stump and root wood is done by so-called energy wood trucks.
These trucks are also used for the road transportation of loose logging residues and whole trees.
The frame volume of energy wood trucks is commonly 130–150 m 3 . The frame volume of the
biggest energy wood trucks is currently 160 m 3 in Finland. According to the machinery survey of
Kärhä in 2007, there were 60 energy wood trucks in use in Finland. Typically, the stump load size
in road transportation is more than 20 tonnes.
Heavy mobile or fixed stationary crushers are used for the comminution of stumps. Nearly 70% of
all stump wood chips used for energy generation in 2009 were produced at power plants. In 2009,
28% of all the stump wood comminution was performed at terminals. Small stump wood batches
were also comminuted at the roadside landings by mobile crushers.
When stump wood has a long storage period, it is an excellent source of fuel in winter when other
wood fuels tend to be moist. The moisture content of stump wood chips is usually below 40% also
during the winter months. Nowadays, impurities such as soil and stones are still the greatest
problem in stump wood chip production. However, the quality of stump wood chips can be
improved by developing extraction technology and techniques, carefully selecting extraction sites,
and correct timing of the extraction operations.
Keywords: Energy wood, Finland, Forest biomass, Stumps.
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