How does the Partnership for Carbon Transparency (PACT) method share a warehouse's energy to my product: by floor area or by tonnes?
PACT shares storage energy by floor area: the share of the site's area your product covers, times the site's total energy use, times the emission factor for each energy type. It applies when storage is material and under your responsibility, meaning you own or pay for it. Without energy data, industry benchmarks per floor area may be used.
The formula
Storage emissions = (area covered by your product / total area of the storage site) x the site's energy use x the emission factor of each energy type. PACT asks you to collect the energy used by the storage facility and, for third-party storage, the area contracted to store your product.
When it applies
PACT applies it if storage emissions are material, meaning above the exemption rules, and under your responsibility, meaning you own or pay for the storage. If you have no figure for the facility's energy, PACT says you may use industry benchmarks based on the site's total floor area.
Which storage is inside the footprint (our reading)
Storage before your factory gate, such as a raw material store, sits inside the cradle-to-gate boundary. Storage after the gate is outbound and is reported separately, not added to the footprint.
How it sits with the other warehouse pages here
The third-party logistics (3PL) page on this site takes your share by tonnes handled and another uses cubic metres. PACT takes floor area. Each key gives a different answer from the same site total. Use the key your buyer's method names and keep it every year.
Rented store, one month, example numbers
- Your pallets cover 400 square metres (m2) of a 2,000 m2 site: 400 / 2,000 = 20%
- Site electricity that month: 30,000 kilowatt hours (kWh). Your share: 0.20 x 30,000 = 6,000 kWh
- Emissions: 6,000 x 0.675 = 4,050 kilograms (kg) of carbon dioxide (CO2), where 0.675 is the India grid average for financial year (FY) 2025-26, used here as an example factor
- Spread over 9,000 pieces stored that month: 4,050 / 9,000 = 0.45 kg CO2 per piece
Numbers are examples. This grid factor covers carbon dioxide only; PACT's electricity scope also includes upstream fuel and grid losses. The final division by pieces is our step; PACT's formula stops at the product's share of site emissions. For electricity PACT asks for the market-based method; see the electricity page.
What Senseible does here
Senseible reads fuel invoices and electricity bills into monthly records. The floor area share comes from your storage contract. Senseible builds figures in the PACT exchange format as a custom integration, on request.
- Shared warehouse emissions: your share by tonnes
- Warehouse share by cubic metres
- Delivery under PACT
- Electricity factor under PACT
Sources: PACT Methodology Version 3.0, World Business Council for Sustainable Development (WBCSD)
Last reviewed 2026-11-07. Formula is from PACT Methodology 3.0, section 3.3.2.1 part A. Which storage is inside the boundary is our reading of that section.