BlueScope asks you for the emissions behind what you supply, or the freight you move for them. They want supplier-specific data, not an industry average. Two questions follow: why does it matter so much to them, and how do you give them a number that holds up?
About this guide
CO2 Lab is not affiliated with, endorsed by, or partnered with BlueScope. This guide explains their publicly reported Scope 3 approach, as at October 2026, to help suppliers respond, and is based on the sources linked below. All trademarks are the property of their respective owners.
Why BlueScope needs your number
Scope 3 is about 54% of BlueScope's total emissions, mainly purchased iron and steel, the extraction and processing of raw materials, and the use of the products it sells. BlueScope has been open that getting supplier-specific data is a challenge, because its suppliers are at different stages of their own reporting, so it is engaging them with education and tailored support. The practical consequence for you: a real figure from your business replaces the estimate it would otherwise apply, and that makes your number genuinely wanted.
Where BlueScope's Scope 3 sits
| Measure | Detail |
|---|---|
| Share of total | Scope 3 is about 54% of BlueScope's emissions |
| Main sources | Purchased iron and steel, raw material extraction and processing, and use of sold products |
| The data gap | Limited supplier-specific data, so estimates are used today |
| What your number does | A real figure replaces the estimate applied to your contribution |
Supplier-specific beats the estimate
Without your data, BlueScope falls back on a spend-based or industry-average estimate for your contribution. A real Scope 1 and 2 footprint, with the method shown, is more accurate and is what it is asking for. For a carrier that is fuel per tonne-kilometre; for a materials or manufacturing supplier it is energy and process emissions per unit. It is the same discipline behind any customer's data request, and a named steelmaker reporting under the ASRS is exactly the kind of customer driving it. A major miner like BHP is making the same request further up the chain.
“When a customer is actively hunting for supplier-specific data, your real number is worth more than a perfect one. It replaces an estimate they would rather not use.”
Why your figure is wantedHow to respond
A first response to BlueScope
- Build Scope 1 and 2 from your energy, fuel and activity records
- For freight, express it per tonne-kilometre; for materials, per unit
- Apply the current NGA Factors, method shown behind each figure
- Flag what is measured and what is estimated
- Allocate to the BlueScope relationship, and keep the evidence together
Turn the BlueScope request into supplier-specific data. What our AI Sustainability Analyst gives you:
Give BlueScope the supplier-specific number it's asking for
Our AI Sustainability Analyst builds your Scope 1 and 2 from your own records, with the method and evidence behind every figure, ready to share.
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