wood
solid biomassDESNZ 2025 Wood Logs. Scope-1 CO2e (CH4+N2O only; biogenic CO2 netted to zero) is a separate factor from the biogenic combustion CO2 (reported 'outside of scopes'). IPCC 2006 Wood/Wood Waste NCV 15.6 MJ/kg (range 7.9–31.0), raw combustion CO2 112,000 kg/TJ (before biogenic accounting) — NOT directly comparable to the DESNZ split.
- Wood energy content depends strongly on species and MOISTURE content — a fresh/green log holds far less usable energy than seasoned wood. Treat the figure as a representative value.
- Biogenic CO2 from wood combustion is reported on a SEPARATE line ('outside of scopes'), not folded into the Scope-1 total — it is not silently zeroed.
Density
425 kg/m³
at stacked/bulk, as sold
Heating values
Emission factors
| Metric | Value | Scope | Region / year | Source |
|---|---|---|---|---|
| CO₂e | 0.04698508 kgCO2e/kg | Scope 1 (direct) | UK · 2025 | |
| biogenic CO₂ | 1.43623 kgCO2/kg | outside the scopes (biogenic, reported separately) | UK · 2025 |
CO₂ ≠ CO₂e — separate metrics, never converted into one another.Biogenic CO₂ is listed on its own line: the carbon still leaves the stack, but it is accounted for separately from fossil CO₂ rather than added to it. What these metrics mean →
Worked example
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Energy
Same energy expressed in other units.
Mass
Volume
Emissions
CO₂ and CO₂e are separate — never derived from each other.
Energy density
Energy per unit of mass or volume.
Assumptions
- density: assumed wood density 425 kg/m³ at stacked/bulk, as sold
- heating value basis: energy on LHV/NCV basis, 14.71 MJ/kg
- heating value basis: energy on HHV/GCV basis, 16.256 MJ/kg
Sources
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