Use operational data already needed by the project
Invoices, interval metering, PV production, exported electricity and fuel data form a stronger starting point than narrative claims. Define boundaries and units once so that finance, operations and sustainability teams use the same numbers.
Separate measured results from estimates
Record whether a figure comes from a meter, invoice, engineering model or supplier declaration. For solar and BESS projects, preserve the baseline, assumptions and calculation version used for the investment decision.
Keep the process proportionate
A smaller company rarely needs a complex data platform at the beginning. It needs named owners, a repeatable annual dataset, controlled calculations and evidence that can answer customer or lender questions without rebuilding the story each time.
Primary sources and further reading
Information reviewed on 1 September 2026. Regulatory information is not legal advice.