In 2026, if you manage an industrial facility in China, carbon accounting stopped being optional. The national ETS expansion to steel, cement, and aluminum — with chemicals and petrochemicals entering by 2027 — means carbon is now a direct operating cost. And the EU’s CBAM means exporters need verified carbon data to avoid paying European carbon prices at the border.
But most plant managers I talk to have never done a rigorous carbon inventory. They have energy bills and production records, but not a systematic accounting of Scope 1, 2, and 3 emissions that would survive an audit.
Here’s how to build one.
Scope 1: What You Burn and Emit Directly
Scope 1 covers direct emissions from sources you own or control. For a typical manufacturing plant, this means:
Stationary combustion. Boilers, furnaces, heaters, generators that burn natural gas, coal, diesel, or biomass. For each fuel source, you need annual consumption (in physical units — cubic meters of gas, tons of coal) and the emission factor (kg CO2 per unit of fuel). China’s NDRC publishes default emission factors, but using fuel supplier-specific factors (if available) is more accurate.
The calculation: Fuel consumed × Net calorific value × Emission factor × Oxidation factor = CO2 emissions.
Mobile combustion. Company-owned vehicles — forklifts, delivery trucks, on-site heavy equipment. This is usually a small fraction of total Scope 1, but it needs to be tracked.
Process emissions. This is where industrial carbon accounting gets harder than commercial building accounting. If your process chemically converts carbonates (limestone in cement, dolomite in steel, soda ash in glass), CO2 is released from the chemical reaction itself — not from fuel combustion. Process emissions come from your mass balance: how much raw material went in, how much carbon it contained, and how much was converted to CO2 versus remaining in the product.
Fugitive emissions. Refrigerant leaks, methane from anaerobic wastewater treatment, SF6 from electrical equipment. These are typically estimated using emission factors rather than direct measurement, but they count.
Scope 2: The Electricity You Buy
Scope 2 is purchased electricity, steam, heat, or cooling. For most manufacturing plants, electricity dominates Scope 2.
The calculation uses two methods in parallel:
Location-based: Use the average grid emission factor for your regional grid. China has six regional grids with different emission factors — the North China grid (0.9419 kg CO2/kWh in 2023) is nearly twice as carbon-intensive as the Southwest grid (0.5010 kg CO2/kWh). Know which grid you’re on.
Market-based: If you purchase green power through PPAs, renewable energy certificates, or other contractual instruments, you can use the emission factor associated with that specific purchase. This requires documentation that survives audit — a certificate isn’t enough; you need the full contractual chain.
The gap between location-based and market-based Scope 2 is where renewable energy procurement shows its value. A factory with 100% green power procurement can report near-zero market-based Scope 2 even if the physical grid they’re connected to is coal-heavy.
Scope 3: The Supply Chain That’s Coming
Scope 3 is everything else — upstream and downstream emissions in your value chain. For a manufacturing plant, the big categories are:
Purchased goods and services (Category 1). The embodied carbon in your raw materials. For a battery factory, this is the cathode precursor, anode graphite, electrolyte, separator. This is typically the largest Scope 3 category for manufacturers, and the hardest to quantify accurately.
Upstream transportation (Category 4). Moving raw materials to your factory. This is manageable with logistics data: distance, mode (truck/rail/ship), and fuel type.
Waste generated in operations (Category 5). Disposal and treatment of solid waste, wastewater, and hazardous waste from your operations.
Most companies start with Scope 1 and 2 and add Scope 3 categories gradually. The GHG Protocol allows this — you don’t need all 15 Scope 3 categories on day one. But your major customers and regulators will eventually expect Categories 1 and 4 at minimum.
The Data Infrastructure You Actually Need
Carbon accounting requires data that most plants don’t routinely collect in one place:
– Fuel purchase records (invoice-level, not budget-level)
– Electricity bills by meter (not just a single facility total)
– Production output by product line (for intensity metrics — kg CO2 per unit of product)
– Raw material purchase records with supplier information
– Waste disposal manifests and quantities
If this data lives in different departments — purchasing, production, maintenance, environmental — and nobody has pulled it together, your first carbon inventory will take 3-6 months. The second one will take weeks, because the data collection process is established.
The plants that handle this well appoint a carbon data owner — not necessarily a full-time role, but a specific person responsible for maintaining the data streams that feed the carbon inventory. Without clear ownership, carbon accounting becomes someone’s additional duty that never quite gets done.
Verification: When Someone Checks Your Numbers
If you’re subject to ETS compliance or CBAM reporting, your carbon data will be verified by a third party. The verification process looks a lot like a financial audit — the verifier checks that your methodology follows the standard, your data is supported by documentary evidence, and your calculations are accurate.
The plants that struggle with verification are the ones that can’t produce the underlying data. The verifier asks for natural gas invoices and the plant produces a spreadsheet summary with no source documents. The verifier asks for the emission factor source and the plant says “we found it online.”
Build your carbon inventory as if it will be audited — because it will be.
Carbon accounting isn’t complicated math. Most Scope 1 and 2 calculations are multiplication. The difficulty is organizational: getting the right data from the right sources, maintaining it over time, and documenting everything well enough to survive verification. Start now, even if your first inventory is imperfect. A rough baseline you can improve is better than no baseline at all.