GHG Inventory Boundary for Automotive Suppliers
A practical guide to help your company determine minimum inventory scope per GHG Protocol
Scope 1 (Direct Emissions)
- Natural gas furnace/drying
- Paint shop VOC processes (if applicable)
- Forklift fuel
Scope 2 (Indirect Energy Emissions)
- Injection machine electricity
- Compressor
- Heating/cooling
Dual Reporting: Location-based uses regional grid emission factors; market-based uses contractual factors (I-RECs, PPAs). Both approaches must be reported.
Scope 3 (Value Chain Emissions)
- 1Forcing Cat1 into spend-based without recipe/BOM
- 2Missing compressor leaks from scope2
- 3Ignoring supply chain geography
- 4Using only invoice totals for Cat4/9 logistics
- 5Not separating waste metal/plastic
- 6Using product-based allocation key without documentation
- 7Not preparing 'product carbon footprint' output for customer demands
- 8Using Scope 2 market-based claim without documentation
- 9Ignoring business travel/commuting
- 10Completely overlooking CapEx
Priority Categories
9 categoriesPlastic injection parts
Relevant: Scope2 + Cat1 polymer
Data: kg polymer + kWh
Approach: average-data → top suppliers
polymer type and recycled content
Metal processing
Relevant: Cat1 metal + Cat5 scrap
Data: tonnes metal + tonnes scrap
Approach: average-data
alloy type
Cable production
Relevant: copper/aluminum supply
Data: kg conductor
Approach: supplier-specific target
source country
Paint shop
Relevant: chemical + energy
Data: kg paint/solvent + kWh
Approach: average-data
process emission separation
JIT logistics to OEM
Relevant: Cat4/9
Data: tonne-km
Approach: hybrid
delivery point
This content is for informational purposes. Your company's reporting scope may expand based on operational reality, reporting standards, assurance requirements, stakeholder expectations, and regulations.