Solid Bio Fuels :

Stem wood chips

Whole tree chips

Sawdust

Bark (birch)

Bark (coniferous)

Wood pellets

Briquettes

Energy grasses

Peat (sod)

Peat (pellets)

Straw (chopped)

Corn residues

Coal

Heavy fuel oil

MSW from households

Black liquor

Lignin powder/ pellets