Woodchips are small- to medium-sized pieces of wood formed by cutting or chipping larger pieces of wood such as trees, branches, logging residues, stumps, roots, and wood waste. Woodchips may be used as a biomass solid fuel for power generation and cements, and are raw material for producing wood pulp. They may also be used as mulch in gardening, landscaping, and ecosystem restoration.
Woodchip varieties include: ag chips (from agricultural source) forest chips (from forest cleanup), wood residue chips (from untreated wood residues, recycled wood and off-cuts), sawing residue chips (from sawmill residues), nut shells (pistachio shells, walnut shells, almond shells), Pits residue (olive pits, prune pits).
Pellet fuels are a type of solid fuel made from compressed organic material. Pellets can be made from various source of biomass: industrial waste, agricultural residues, energy crops, and untreated lumber. Pellets are categorized by their heating value, moisture content, ash content, durability and dimensions.
Bio-Char or Char Pellets is the lightweight black residue, made via pyrolysis of woodchips or wood pellets. It can be blended with conventional solid fuels for power generation and cement industry.