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Separate a unit match from a coverage match
A generation-only factor and a life-cycle factor can both be expressed per kWh. Their numerators may cover different upstream or other stages. Matching kWh alone does not justify treating the products as the same inventory quantity.
Read the source documentation
| Field | Example question |
|---|---|
| Gases | CO2 only or a stated multi-gas metric? |
| Stages | Generation, upstream fuel or a broader life cycle? |
| Losses | Which transmission or distribution treatment? |
| Method | Which inventory or project-accounting use? |
Check for overlaps when aggregating
If a broad factor already contains an upstream component, adding a separately calculated version of the same component can duplicate it. Identify the boundaries before summing calculated amounts.
Keep a sourced factor from becoming universal
A factor can be credible for its intended scope and still be inappropriate for another geography, year or method. Record the specific row and purpose rather than treating the publisher’s name as sufficient evidence of every use.