Carbon footprint for manufacturing: an industry guide

Manufacturing carbon footprints follow a recognisable pattern: Scope 1 dominated by process heat and fuels, Scope 2 by grid electricity, and Scope 3 concentrated in categories 1 (purchased goods), 11 (use of sold products) and 4/9 (transport). This guide sets out how to build a manufacturing-grade footprint and where to focus reduction effort.

Scope 1 in manufacturing

Typical sources:

• Process heat — gas boilers, furnaces, kilns. Often the largest single line.
• On-site combustion for CHP.
• Forklift and internal transport — diesel or LPG.
• Refrigerants — cold stores, comfort HVAC.
• Fugitive emissions — solvent losses, welding gases.

Measurement is straightforward when metering is in place. Sub-metering by production line unlocks intensity KPIs (kgCO₂e per unit produced) which are more useful for management than absolute totals.

Scope 2

Grid electricity dominates. Best practice:

• Consumption from HH metering.
• Dual reporting (location- and market-based) per GHG Protocol.
• On-site solar and PPAs to reduce the market-based figure.
• Track by plant to enable comparison and benchmarking.

Scope 3

For most manufacturers, three categories dominate:

• Category 1 (purchased goods) — raw materials, components. Steel, aluminium, plastics, chemicals typically dominate. Move from spend-based to supplier-specific data.
• Category 11 (use of sold products) — for energy-consuming products (motors, appliances, vehicles), this often exceeds all other categories combined.
• Category 4 and 9 (upstream and downstream transport) — modal mix and route optimisation are the main levers.

Data infrastructure

Manufacturing carbon accounting benefits from direct ERP and MES integration:

• Bill-of-materials × material emission factors.
• Real-time energy from BMS / SCADA.
• Fuel and refrigerant records from maintenance systems.
• Supplier data through procurement.

Reduction levers

• Process heat electrification — heat pumps for low-temp; electric furnaces where feasible.
• Waste-heat recovery — pinch analysis on high-temperature processes.
• Renewable PPA + on-site solar for Scope 2.
• Design-for-environment — material substitution, lightweighting, circularity for Scope 3.1 and 3.11.
• Supplier engagement — cascade SBTi expectations to Tier 1 and 2.

Financing

• Green Loans for CapEx (heat pumps, solar, retrofits).
• Sustainability-Linked Loans with intensity KPIs (kgCO₂e per unit).

Related reading: Scope 3 emissions explained, Industrial energy savings.