A customer asked us to share product carbon footprints through SiGREEN, now Mattermaps. What is it, and what do we enter?

SiGREEN, the product carbon footprint exchange Siemens launched in 2021, was sold to Makersite and renamed Mattermaps on 4 June 2026. The request is the same: your customer wants the CO2e of one unit of the part you sell, built from your own measured data. Prepare materials per unit, energy per unit and the factor behind each.

What SiGREEN is, and who runs it now

• Makersite bought SiGREEN from Siemens and renamed it Mattermaps on 4 June 2026. Makersite says the service and your data carry on as before, so a request may arrive under either name.
• Siemens launched it in November 2021 to query, calculate and pass on the actual carbon footprint of a product.
• Built to use real data from where emissions happen in the supply chain, rather than industry average values.
• Your footprint is combined with your customer's own production emissions to give their product's footprint.
• At launch, Siemens said data moved directly between customer and supplier, not through a central store, so you did not have to reveal your own suppliers or other sensitive details. Check the current terms in the request before you share.

What one footprint needs

1. The declared unit: one piece, one kg or one metre, exactly as the customer buys it. Confirm it and the boundary in the request before you calculate.
2. Materials bought per unit, including the scrap you cut off, with the emission factor for each: your material supplier's own footprint if they gave one, otherwise a published factor you name.
3. Energy per unit: electricity and fuel for the line that makes this part, divided by the units it made in the same period.
4. Freight to your gate if the request includes it.
5. The period, the sources of every factor, and what you left out.

Why your own numbers matter here

SiGREEN is built around measured supplier data. A spend-based estimate is a fair start when nothing else exists, but it moves with price, not with what you burn, so it cannot show the improvement when you switch to lower-carbon steel or add solar. A sub-meter on the line, a year of fuel invoices and your steel mill's declared footprint are what make your number yours.

Before you press submit

• The unit in your answer matches the unit on the purchase order.
• Material weights match the bill of materials and your purchase invoices, scrap included.
• Keep the workings and the bills. A customer can ask how you got the figure, and next year's number should use the same method.
• Do not send a revenue-based split of your plant total as a product footprint.

Worked example: one powder-coated steel enclosure

• Steel bought per unit: 3.2 kg (2.8 kg in the part, 0.4 kg scrap)
• Steel factor from the mill's declaration: 2.0 kg CO2e per kg (use your mill's own figure)
• Material: 3.2 x 2.0 = 6.40 kg CO2e
• Line sub-meter: 18,000 kWh for 6,000 enclosures = 3 kWh each; 3 x 0.675 = 2.03 kg CO2e
• Coating oven LPG: 1,200 kg x 2.98 = 3,576 kg CO2 for 6,000 enclosures = 0.60 kg CO2e each
• Footprint to your gate: 6.40 + 2.03 + 0.60 = 9.02 kg CO2e per enclosure (unrounded parts), of which material is 71%

Example figures, including the steel factor. Grid electricity from the CEA CO2 Baseline Database version 22.0 for FY 2025-26; LPG from IPCC 2006 defaults.

What Senseible does here

Senseible's product carbon footprint calculator takes your materials, energy and units made and gives a cradle-to-gate figure per unit, by stage, ready to enter in your customer's request. You submit it in Mattermaps yourself.

• Product carbon footprint calculator
• What to send for a footprint request
• Splitting factory electricity by product
• Why buyers reject footprints

Sources: Siemens press release, SiGreen and the Estainium network (22 November 2021), Siemens, SiGREEN and supply chain carbon footprints (Siemens Xcelerator insight), ISO 14067:2018 Carbon footprint of products (iso.org), CEA CO2 Baseline Database for the Indian power sector, version 22.0

Last reviewed 2026-10-30. SiGREEN was renamed Mattermaps after Makersite completed its purchase from Siemens (Makersite press release, 4 June 2026). Add the Makersite release as a source once approved, and re-check how Mattermaps handles supplier data.