Energy Academy
Level 1/Carbon Accounting Fundamentals
Carbon, Scopes & Factors2 / 11

Scopes 1, 2 & 3 Explained

The GHG Protocol's three scopes with UK examples: what you burn, what you buy as energy, and everything else, and why the split prevents double counting.

10 min read · Jacob Willis, Net Zero Lead · Last reviewed July 2026

Ask "what are your emissions?" and the honest answer is another question: which ones? The fuel your boilers burn is clearly yours; the electricity you buy was generated by someone else; the emissions of your suppliers, your deliveries and your customers using your product belong, in some sense, to everyone involved. The GHG Protocol's answer, the three scopes, is the single most useful piece of vocabulary in carbon accounting: it organises every footprint, prevents double counting, and decides which emissions an organisation must own. This lesson gives you the three scopes with UK examples and the boundary logic underneath them.

Scope 1: what you burn

Direct emissions from sources the organisation owns or controls. The classic members:

  • Stationary combustion: gas boilers, furnaces, ovens, generators, the fired systems of Level 2.
  • Mobile combustion: company-owned vehicles and plant, from vans to forklifts.
  • Fugitive emissions: refrigerant leaks, priced in CO₂e through those high GWPs from the previous lesson, plus any process gas losses.
  • Process emissions: chemistry that releases greenhouse gases directly (cement calcination being the famous example).

Scope 1 is where the organisation's own machinery meets the atmosphere: if you stopped operating tomorrow, these emissions would stop with you.

Scope 2: what you buy as energy

Indirect emissions from purchased electricity, heat, steam or cooling. The generation happens elsewhere (a power station's scope 1), but the consumption is yours, so scope 2 assigns it to you. For most UK offices and many factories, purchased electricity is the largest single line in scopes 1+2 combined, and it carries a twist big enough to earn its own lesson: there are two legitimate ways to count it (grid-average versus contract-based), and they can give very different answers. Note the neat bookkeeping: your scope 2 is the generator's scope 1, counted once each from two perspectives that never add together into a global total. That is the double-counting discipline working as designed.

Scope 3: everything else

All other indirect emissions in the value chain, upstream and downstream: purchased goods and services, capital goods, fuel-and-energy-related emissions not in scopes 1 and 2, transport and distribution, waste, business travel, commuting, leased assets, use of sold products, end-of-life. The GHG Protocol organises these into fifteen categories, and for most organisations scope 3 dwarfs the other two: a manufacturer's materials, a retailer's products, a dairy's farms (as the dairy course's capstone noted, the cows dominate milk's footprint, and they are the processor's scope 3). Scope 3 is also where data gets hard, which is why the practice lesson teaches screening before precision: find the categories that matter for your organisation before chasing decimal places in ones that don't.

Worked example — sorting one company's emissions into scopes
Given
  • A food distribution company: gas heating in its warehouse, a diesel van fleet it owns, purchased electricity for its cold store, refrigerant top-ups on that store, subcontracted haulage, employee commuting, and the emissions of the food producers it buys from
Find
Which scope each belongs to.
Scopes allocate responsibility, not blame

The scopes are a bookkeeping convention that gives every emission exactly one scope-1 owner, with scopes 2 and 3 letting others acknowledge their share of demand. Their practical power is decision-making: scope 1 you fix with your own plant and fuel choices, scope 2 with efficiency and procurement, scope 3 with supplier engagement and design. An energy manager's home turf is scopes 1 and 2, which is why every kWh saved in the rest of this platform lands directly in the carbon account this course is teaching you to build.

What's next

Scopes organise the footprint; factors fill in the numbers. The next lesson covers the conversion that does most of the work in UK carbon accounting: activity data times emission factor, and the government factor set that makes it standard.

Sources and further reading