Fossil solid fuels | Biomass solid fuels | Waste-derived solid fuels |
Non-coking (thermal) coal — bituminous/sub-bituminous grades used in boilers, kilns, sponge-iron DRI units, captive power. | Firewood/wood logs & wood chips — small boilers, kilns, dryers. | Refuse-Derived Fuel (RDF) / Solid Recovered Fuel (SRF) — cement kilns, waste-to-energy boilers. |
Lignite — widely used in boilers and small power plants (e.g., ceramics, textiles, food processing). | Charcoal (wood/coconut-shell) — foundries, metallurgy, small industrial heating. | Tyre-Derived Fuel (TDF) — shredded tyres in cement/lime kilns. |
Metallurgical coke (met coke / hard coke, incl. LAM coke & foundry coke) — high-carbon fuel/reductant for iron & steel, foundries. | Agricultural-residue briquettes — rice husk, sawdust, groundnut/coconut shells, mustard/soy stalks, corn cobs, etc.; common in textiles, food, bricks. | Processed industrial solid wastes (e.g., dried paint sludge, packaging residues) — co-processing in cement kilns per permits. |
Coke breeze — fine coke fractions for sintering and smaller furnaces. | Biomass pellets (non-torrefied) — industrial boilers and co-firing. | —- |
Petroleum coke (petcoke; green/raw for fuel; calcined mostly non-fuel/anodes) — cement kilns, lime/calcination; subject to local emission rules. | Torrefied biomass pellets (“bio-coal”) — higher energy density; boilers and co-firing applications. | —- |
Coal/lignite briquettes — densified low-grade coal or fines for small and medium boilers. | Bagasse — sugar mills’ cogeneration and process steam; also sold to nearby industries when surplus. | —- |
—- | Palm kernel shells / imported biomass residues — used by some cement/textile units where available. | —- |

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