Scope 1, 2 and 3 emissions for manufacturers

Regulation & compliance · 8 min read · Updated 2026-05-30

What the three emission scopes mean for a manufacturer, how to draw boundaries, where the data comes from, and how to turn an inventory into action.

Why the scopes exist

To report, compare and reduce greenhouse-gas emissions, organisations need a consistent way to count them. The widely used framework divides emissions into three scopes according to where they occur relative to the reporting company. The split avoids double-counting when many companies report, and it clarifies how much of a footprint a company controls directly versus influences indirectly.

For a manufacturer, understanding the scopes is the starting point for any carbon reporting, target or regulatory submission. The boundaries decide what counts, and getting them right is the foundation everything else rests on.

Scope 1: direct emissions

Scope 1 covers direct emissions from sources the company owns or controls. For a manufacturer this typically includes fuel burned on site — in boilers, furnaces, kilns and direct-fired processes — combustion in owned vehicles, and any process emissions released by the chemistry of what the site makes. It also includes fugitive emissions such as refrigerant leaks.

Scope 1 is usually the most directly controllable footprint, because it comes from equipment the site operates. The data comes from metered fuel use, process records and refrigerant records, converted to emissions using published factors. Cutting scope 1 is largely a matter of burning less fuel and switching to cleaner fuels.

Scope 2: purchased energy

Scope 2 covers indirect emissions from the energy a company buys and uses — most commonly purchased electricity, but also purchased steam, heat and cooling. The emissions physically occur at the power station or supplier, but they are counted by the user because the user's demand caused them.

There are two ways to report scope 2. The location-based method uses the average emissions of the local grid. The market-based method uses the emissions of the specific electricity the company has contracted for, which can be lower if it buys verified low-carbon power. Manufacturers often report both. Scope 2 falls through using less electricity, buying cleaner electricity, or generating low-carbon power on site.

Scope 3: the value chain

Scope 3 covers all other indirect emissions across the value chain — both upstream and downstream of the company. For a manufacturer this includes the emissions embedded in purchased raw materials and components, transport and distribution, business travel, waste, and the use and end-of-life of the products sold.

Scope 3 is usually by far the largest part of a manufacturer's footprint and by far the hardest to measure, because the emissions sit with suppliers and customers rather than on the company's own meters. It relies on supplier data, industry-average factors and estimation. Because it is large and influential, it is increasingly the focus of customer requirements and regulation — but it is also where the data is weakest, so a manufacturer usually builds scope 3 up category by category, starting with the largest.

Drawing boundaries and gathering data

Before counting, a company sets its boundaries: which legal entities and sites are included (the organisational boundary) and which activities (the operational boundary). Consistent boundaries make year-on-year comparison meaningful and stop emissions falling through the gaps or being counted twice.

Data quality then determines the inventory's value. Scope 1 and 2 should come from actual metered fuel and energy use wherever possible, not estimates. This is where energy metering and management systems earn their place — the same meters that track energy cost provide the activity data for the carbon inventory. Scope 3 leans on supplier engagement and well-chosen factors. The aim is an inventory accurate enough to drive decisions and to withstand scrutiny.

From inventory to action

An emissions inventory is a means, not an end. Once a manufacturer knows where its emissions sit, the same hierarchy that governs decarbonisation applies: cut energy demand through efficiency, switch to cleaner energy and fuels, and address the residual. Because scope 1 and 2 are dominated by energy use, the efficiency measures that lower energy bills — better combustion, heat recovery, efficient motors and drives, and insulating hot surfaces — are precisely what move the reported numbers.

For scope 3, action means working with suppliers and rethinking materials and products, which is slower but where the largest emissions usually lie. Tracking the inventory year on year, with reliable data, turns reporting from a compliance chore into a management tool that shows whether the reductions are real.

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