User Guide
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09.2 · Carbon Emissions

Emission Factors

An EmissionFactor is a coefficient that says "this much kgCO₂e per unit of this thing".

Fields

FieldPurpose
ResourceTypeLabour / Material / Plant / Sub / Other.
MaterialNameE.g. "Concrete 25MPa", "Structural Steel".
CategoryFree-text bucket (e.g. "Cementitious", "Metals").
FactorkgCO₂e per unit.
UnitThe input unit (kg, m³, t, hr).
EmissionUnitkgCO₂e or tCO₂e.
DefaultScope1 / 2 / 3.
DataSource"DEFRA 2024", "ICE v3.0", "Supplier EPD".
DataYearThe vintage of the dataset.
RegionAU, NZ, UK, US — impacts factor validity.
IsSystemDefaultTrue for factors shipped with TX1 or owned by your organisation.

Creating a Custom Factor

  1. Open Carbon → Emission Factors.
  2. Click New Factor.
  3. Fill in the fields above.
  4. Optionally set IsSystemDefault = true if you have admin rights and want it organisation-wide.

System Defaults

TX1 ships with a seed of common factors (concrete, steel, timber, diesel, electricity by region). They are read-only unless you copy them to an override.

Linking Factors to Resources

A resource stores its own emission factor and scope. The most common setup:

  1. Create or select an EmissionFactor master record.
  2. On the resource, enter the same CarbonEmissionFactor value.
  3. Set the resource's EmissionScope.

When you use the resource on an item, TX1 populates the item's emission from the resource by default, then lets you override per-item.

Best Practices

  • Always cite a DataSource and DataYear so reports are auditable.
  • Prefer supplier-specific EPDs (Data Quality 5) where available.
  • Don't mix units — an item in tonnes needs a factor priced per tonne.
  • Keep regional factors separate (AU Electricity vs UK Electricity) — electricity grids vary widely.

Deleting Factors

Factors in use by at least one resource or emission record are protected — the delete button is disabled and a tooltip shows usage count. Reassign or archive first.