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Recycled wood

Mangled hinge in ash

There is a complex set of regulatory rules associated with the use of waste wood as the feedstock for wood chips used in commercial scale biomass boilers. The key issue is that you must use a fuel that makes it compliant with the RHI emission limits. In practice this means only grade A waste wood can used. Waste wood is defined into Grades A to D under BSI PAS 111:2012.

Grade A wood will be sourced from packaging, pallets and secondary manufacturing. It will contain nails, metal fixings, paints and surface coatings before clean up and processing into wood chips. If using biomass fuel is sourced from Grade A waste wood compliance with the Environmental Permitting Regulations is required. This means a Part B permit must be obtained from the Local Authority.

It is worth working out if Grade A waste wood (after processing) will be lower in cost than chips produced local forestry; as often the cost of cleaning waste wood can push up costs. There is also a reputational concern that using waste wood fuel might be seen as problem compared to locally sourced forestry. In summary Grade A waste wood cannot be ruled out, but may not save money and comes with regulatory and reputational challenges.