Data lineage
When a number is questioned, you should not have to reconstruct it.
Start at the whole estate and walk down to the single entry behind any figure, then trace how that entry was calculated. Not a description of the calculation. The calculation, with the factor that priced it, where that factor was published, and what it deliberately left out.
The descent
Five steps from a portfolio total to one meter reading. Each step shows what share of the level above it accounts for, so you can see where a number came from rather than guessing which building moved.
- PortfolioWhole estate9,290.31 tCO₂e
- CategoryUK electricity6,346.64 tCO₂e68%
- BuildingOne data centre4,111.16 tCO₂e65%
- PeriodDecember 2025102.34 tCO₂e2%
- EntryGrid electricity102.34 tCO₂e100%
What the trace carries
Five stages, recorded at the time the figure was produced rather than reconstructed when somebody asks.
Where the number arrived from, kept as evidence rather than as a note. A connector sync carries its own identifier, the moment it landed and the host it came from. A spreadsheet upload carries the file, the import batch and who uploaded it.
Connector sync · imported 25 Jul 2026, 19:17
The activity data exactly as recorded: the quantity, its unit, the building it belongs to and the dates it covers. Nothing is rounded on the way in, and nothing is aggregated before it is stored.
417,047.55 kWh · 1 to 31 December 2025
Every factor applied to that quantity, each shown as the arithmetic rather than as a result. The factor set is named, dated and linked to the publisher, and the publisher revision is recorded alongside the date we imported it, so a factor revised after your reporting period cannot silently rewrite it.
UK GHG Conversion Factors 2025 · publisher revision 10 June 2025
Where each part of the result lands under the GHG Protocol, and what sits outside the scopes entirely. Biogenic carbon is calculated and reported, and held out of the gross figure, because including it would overstate the footprint.
Scope 2: 73.82 · Scope 3: 28.53 · gross 102.34 tCO₂e
The reported figure, and every place it feeds. The same entry appears on the dashboard, in emissions analysis and in the SECR pack, and all three are reading this calculation rather than a copy of it.
Dashboard · Emissions Analysis · SECR pack
One entry, in full
Grid electricity, one building, 1 to 31 December 2025. Quantity 417,047.55 kWh. Every factor below is multiplied against that one quantity, and the in-scope rows sum to the reported total. Add them up.
| Scope | Basis | Factor / kWh | kgCO2e |
|---|---|---|---|
| Scope 2 | Location-based | 0.177 | 73,817.42 |
| Scope 3 | Transmission and distribution | 0.01853 | 7,727.89 |
| Scope 3 | Well-to-tank, generation | 0.0459 | 19,142.48 |
| Scope 3 | Well-to-tank, transmission and distribution | 0.00397 | 1,655.68 |
| Outside scopesnot in gross | Biogenic carbon dioxide | 0.11507 | 47,989.66 |
| Gross total, Scopes 1 + 2 + 3 | 102,343.47 | ||
Why the factor version is on the page
Conversion factors are revised. If a figure is priced with whatever set happens to be current when somebody opens a report, last year’s number quietly changes and nobody is told. Every calculation here records the factor set, the publisher’s revision date and the date we imported it, so a figure reported in one period keeps the factors that were in force in that period.
A year with no published factor set fails rather than borrowing another year’s, and an interim set carries a label that travels with it into every trace and every citation.
Bring us a number you cannot explain
We will open it in front of you, down to the meter reading and the factor that priced it.