How grid carbon intensity affects product emissions

What Grid Carbon Intensity Means

Every unit of electricity delivered to a factory or home is generated somewhere. It might come from burning coal, burning natural gas, splitting uranium atoms, capturing sunlight with photovoltaics, or converting the kinetic energy of wind or falling water. Each generation technology releases a different quantity of CO₂e per kilowatt-hour of electricity produced. The grid carbon intensity of an electricity system is the weighted average of those individual intensities across all the generators currently supplying the grid, expressed in grams of CO₂-equivalent per kilowatt-hour (gCO₂e/kWh).

A coal-heavy grid — where most electricity comes from burning bituminous coal — might have a carbon intensity above 800 gCO₂e/kWh. A gas-dominated grid typically sits between 400 and 500 gCO₂e/kWh. A system with a large share of nuclear, hydro, and renewables can fall below 100 gCO₂e/kWh. An almost entirely renewable grid — as found in Iceland (largely geothermal and hydro) or Norway (predominantly hydro) — can reach single-digit intensities.

The IEA publishes annual emissions factors for national electricity systems. The 2024 edition gives China’s national average at 565 gCO₂e/kWh, the United States at approximately 390 gCO₂e/kWh, the EU average at roughly 300 gCO₂e/kWh, and the Nordic countries (Sweden and Norway combined) at around 30 gCO₂e/kWh. India’s grid, still dominated by coal, runs above 700 gCO₂e/kWh.

Why Manufacturing Location Matters

A factory’s Scope 2 emissions — the carbon cost of the electricity it consumes — are calculated by multiplying electricity use by the local grid intensity:

Scope 2 (kgCO₂e) = electricity consumed (kWh) × grid intensity (kgCO₂e/kWh)

A semiconductor fabrication plant drawing 1 million kWh per month in Taiwan (grid intensity ~500 gCO₂e/kWh) emits approximately 500 tCO₂e/month from electricity alone. The same plant relocated to Norway would emit roughly 30 tCO₂e/month — a 94% reduction — from exactly the same physical process, consuming exactly the same amount of electricity.

This is not a theoretical edge case. The global geography of manufacturing is not carbon-neutral. The dominant manufacturing region for consumer electronics — China — runs one of the largest and most carbon-intensive grids in the world. The CCI uses 565 gCO₂e/kWh as the default electricity factor for products assembled in China, consistent with IEA 2024 data. Products assembled in Europe or sourced from factories with documented renewable energy procurement may carry significantly lower Scope 2 footprints.

Regional Comparison

The table below shows how grid intensity varies across major manufacturing regions and what that implies for factory electricity emissions, using a hypothetical product requiring 100 kWh of factory electricity per unit:

Region	Grid Intensity (gCO₂e/kWh)	Scope 2 per 100 kWh	vs. China baseline
China	565	56.5 kgCO₂e	baseline
India	710	71.0 kgCO₂e	+26%
USA average	390	39.0 kgCO₂e	−31%
South Korea	450	45.0 kgCO₂e	−20%
EU average	300	30.0 kgCO₂e	−47%
Germany	350	35.0 kgCO₂e	−38%
France	60	6.0 kgCO₂e	−89%
Nordic (SE/NO)	30	3.0 kgCO₂e	−95%
Iceland	~8	0.8 kgCO₂e	−99%

France’s low intensity reflects its large nuclear fleet. The Nordic figure reflects abundant hydropower. India’s high figure reflects continued heavy reliance on coal for baseload generation.

Grid intensity is not static. China’s grid intensity has been falling as large-scale wind and solar installations come online; the IEA’s 2024 figure is lower than the 2020 figure of approximately 610 gCO₂e/kWh. The CCI updates grid intensity values when new IEA Emissions Factors editions are published.

The IEA Emissions Factors Dataset

The IEA Emissions Factors publication (updated annually) is the authoritative source used by the CCI for national grid intensities. It provides:

• National average emission factors for over 100 countries, covering CO₂ and CO₂e (including methane from gas supply chains)
• Subcategory factors distinguishing between coal, gas, oil, nuclear, hydro, and other renewables where available
• Temporal data allowing year-on-year comparison and trend analysis

The CCI uses the national average factor rather than a marginal factor (the intensity of the last unit of generation dispatched), because average factors better represent the actual carbon cost of electricity consumed in a facility over a year. Marginal factors are more appropriate for assessing the impact of load changes and demand-response programmes.

How Grid Intensity Affects CCI Scores

For most manufactured consumer goods, Scope 2 electricity is a meaningful but not dominant share of total embodied carbon. The breakdown for a typical smartphone is instructive: Scope 2 accounts for approximately 12 out of 75 kgCO₂e (16%), while Scope 3 upstream materials account for 62 kgCO₂e (83%).

The implication is that switching manufacturing location — holding everything else constant — can reduce total product footprint by up to 16% for electronics categories. That is significant but less dramatic than, for example, switching from virgin to recycled aluminium (which cuts material-stage emissions by roughly 95% for that specific component) or redesigning a chip to reduce die area.

For products with higher electricity intensity in manufacturing — certain battery cathode materials, electrochemical processes, aluminium smelting — the Scope 2 share of total embodied carbon is larger, and grid intensity therefore has greater leverage. Lithium-ion battery cell manufacturing, for instance, is electricity-intensive at the cell formation and finishing stages, making grid intensity a more significant variable than it is for mechanical assembly operations.

Renewable Energy Certificates (RECs) and PPAs

Manufacturers can reduce their Scope 2 emissions through two primary mechanisms:

Renewable Energy Certificates (RECs) — also called Guarantees of Origin (GOs) in Europe — are tradeable instruments representing the attributes of one megawatt-hour of renewable electricity generation. A factory can purchase RECs equivalent to its annual electricity consumption to claim “100% renewable” electricity under a market-based accounting approach. The GHG Protocol permits this methodology under its Scope 2 guidance, using a “market-based” factor (often zero for a REC-matched facility) rather than the grid average (“location-based”) factor.

Power Purchase Agreements (PPAs) are direct contracts between a manufacturer and a renewable energy generator. They provide longer-term certainty and typically correspond more directly to actual renewable generation than REC purchases.

The CCI’s default scoring uses location-based Scope 2 factors — the actual grid average — because this represents the physical reality of the electricity system. Manufacturers who submit documented market-based evidence (REC retirement certificates, PPA contracts) as part of a provenance override may qualify for a lower Scope 2 factor in their adjusted CCI score. Apple’s supply chain clean energy programme, which has enrolled numerous Tier 1 and Tier 2 suppliers in renewable energy procurement, is an example of the type of documentation that qualifies for this adjustment.

What Buyers Can Do

For individual consumers, direct control over manufacturing grid intensity is limited. The most actionable insight is to favour products from manufacturers who publish transparent supply chain energy data and who have documented renewable energy procurement in their factories — since these directly lower the Scope 2 component of the product’s embodied carbon.

For institutional procurement teams, specifying grid carbon intensity requirements — for example, requiring that manufacturing facilities operate on grids below 300 gCO₂e/kWh or have REC documentation — is a practical lever. Several large technology companies now include supply chain electricity requirements in their supplier codes of conduct. As CCI scores incorporate these manufacturer-submitted data points when verified, this kind of upstream pressure creates a direct pathway to lower CCI scores across product categories.