Scope 1, Scope 2 and Scope 3 emissions are used to organise greenhouse gas emissions into clear reporting categories. For UK businesses, understanding these scopes is often the first step towards producing a carbon footprint report, responding to supplier questionnaires, preparing SECR information or improving internal emissions visibility.
The scope structure is useful because it separates emissions that are directly controlled by a business from emissions linked to purchased energy and wider value-chain activity. Without that separation, a carbon report can become vague, difficult to review and hard to compare year to year.
Quick answer
Scope 1 covers direct emissions from owned or controlled sources. Scope 2 covers indirect emissions from purchased energy. Scope 3 covers other relevant indirect emissions from wider business activity and the value chain.
What are greenhouse gas emissions?
Greenhouse gas emissions are gases released into the atmosphere that contribute to climate change. In business carbon reporting, emissions are commonly expressed as carbon dioxide equivalent, often written as CO2e. This allows different greenhouse gases to be reported using a single comparable unit.
A business can create or influence emissions in many ways. It may burn fuel in company vehicles, use gas on site, purchase electricity, send employees on business travel, dispose of waste, operate logistics activity or buy goods and services from suppliers. The emissions scope framework helps organise those activities into reporting categories.
Why are emissions split into Scope 1, Scope 2 and Scope 3?
Emissions are split into scopes so organisations can understand where emissions arise and how much control they have over each source. Some emissions are directly produced by the business. Others are linked to energy purchased from suppliers. Others sit further along the value chain and may be harder to measure accurately.
This matters because the quality of evidence, the level of control and the reporting difficulty can be very different across the three scopes. A company may have excellent evidence for electricity use but very limited supplier-specific data for purchased goods. A good carbon report should reflect those differences clearly.
Scope 1 emissions explained
Scope 1 emissions are direct emissions from sources that are owned or controlled by the organisation. These are often the emissions sources most closely linked to day-to-day operations and internal records.
Common Scope 1 examples include fuel used in company vehicles, natural gas used at premises, fuel used in equipment, and refrigerant losses where those records are relevant and available. For some organisations, Scope 1 may be a major part of the carbon footprint. For others, especially office-based businesses, Scope 1 may be smaller or limited to a small number of sources.
Examples of Scope 1 emissions for UK businesses
- Diesel or petrol used by company-owned vehicles
- Natural gas used for heating at company-controlled premises
- Gas oil, LPG or other fuels used in equipment or operations
- Refrigerant leaks from air conditioning or refrigeration systems where applicable
- Direct process emissions for certain industrial activities
Evidence usually needed for Scope 1
- Fuel purchase records
- Company vehicle fuel card data
- Mileage records where fuel data is not available
- Gas invoices or meter records
- Refrigerant service records where relevant
- Site lists and operational boundary notes
Scope 2 emissions explained
Scope 2 emissions are indirect emissions from purchased energy. For many businesses, this mainly means purchased electricity. Depending on the organisation, it may also include purchased heat, steam or cooling.
Scope 2 is indirect because the emissions usually occur at the point where the electricity or energy is generated, not physically at the company site. However, because the organisation purchases and uses the energy, the associated emissions are included in its carbon reporting boundary.
Examples of Scope 2 emissions
- Purchased electricity used at offices, warehouses, factories or depots
- Purchased electricity used across multi-site operations
- Purchased heat, steam or cooling where applicable
- Electricity used for EV charging where it falls inside the agreed reporting boundary
Evidence usually needed for Scope 2
- Electricity invoices
- Meter readings or half-hourly data where available
- Supplier consumption statements
- Site lists and meter lists
- Reporting period dates
- Notes on estimated or missing periods
Scope 3 emissions explained
Scope 3 emissions are other indirect emissions connected to the organisation's wider business activity and value chain. They can sit upstream, such as purchased goods and supplier activity, or downstream, such as distribution, product use or end-of-life treatment depending on the organisation.
Scope 3 is usually the most complex area of carbon reporting. The data can be spread across suppliers, departments, travel systems, waste contractors, finance records and operational teams. Some data may be actual activity data. Some may be estimated. Some may not be available at all in the first reporting year.
For this reason, Scope 3 should be included carefully. It is better to explain the evidence basis and limitations clearly than to present estimated figures as though they are complete or independently verified.
The 15 Scope 3 categories explained
The GHG Protocol Corporate Value Chain approach identifies 15 Scope 3 categories. Not every category is relevant to every organisation. A practical carbon report should consider which categories are material, useful, and supported by suitable data.
1. Purchased goods and services
Emissions linked to products and services purchased by the organisation. This can be difficult to measure precisely unless supplier-specific emissions data or reliable activity data is available.
2. Capital goods
Emissions linked to larger capital purchases, such as equipment, machinery, vehicles, buildings or major assets. Data quality can vary significantly depending on supplier information and available records.
3. Fuel and energy-related activities not included in Scope 1 or Scope 2
Emissions associated with the production, transmission or distribution of fuels and energy that are not already included in Scope 1 or Scope 2 calculations.
4. Upstream transportation and distribution
Emissions from transporting goods before they reach the organisation, where the transport is not owned or controlled by the reporting company.
5. Waste generated in operations
Emissions linked to waste produced by the organisation and handled by third parties. Evidence may include waste contractor reports, waste transfer notes or waste weight estimates.
6. Business travel
Emissions from travel for business purposes, such as flights, rail travel, hotel stays, taxis, hire cars or employee-owned vehicles used for business journeys.
7. Employee commuting
Emissions from employees travelling between home and work. This usually requires employee survey data, HR location information or reasonable assumptions, so limitations should be documented clearly.
8. Upstream leased assets
Emissions from leased assets used by the organisation but not already included in Scope 1 or Scope 2. Relevance depends on lease arrangements and operational control.
9. Downstream transportation and distribution
Emissions from transporting and distributing sold products after they leave the organisation, where relevant to the business model.
10. Processing of sold products
Emissions from third-party processing of intermediate products sold by the organisation. This is more relevant to manufacturing and product-based businesses than many service businesses.
11. Use of sold products
Emissions generated when customers use products sold by the organisation. This can be significant for products that consume energy or fuel during use.
12. End-of-life treatment of sold products
Emissions associated with disposal, recycling or treatment of products at the end of their life.
13. Downstream leased assets
Emissions from assets owned by the organisation and leased to other entities, where relevant.
14. Franchises
Emissions from franchise operations where the reporting organisation is the franchisor and the category is relevant.
15. Investments
Emissions associated with investments. This category is mainly relevant to financial institutions, investors and organisations with material investment portfolios.
Important Scope 3 point
A good Scope 3 section does not have to include every possible category in the first year. It should explain which categories have been included, which have been excluded, why, and what evidence or assumptions support the figures.
Which scope matters most?
There is no single answer. The most important scope depends on the business model. A logistics-heavy company may have significant fuel and transport emissions. A manufacturer may have material energy and process emissions. An office-based service company may have lower Scope 1 emissions but relevant Scope 2, business travel and purchased services emissions.
The correct approach is to start with the reporting purpose, then assess which emissions sources are relevant, measurable and useful to include. The aim is not to make the report look bigger. The aim is to make it accurate, clear and defensible.
How emissions scopes connect to carbon footprint reporting
A business carbon footprint report usually uses the scope structure to organise emissions into clear sections. The report may include an executive summary, scope-level totals, category-level schedules, methodology notes, conversion factor references, assumptions and evidence mapping.
Scope 1 and Scope 2 are often the foundation. Relevant Scope 3 categories can then be added where the data supports a useful reporting output. This is especially important for SMEs and organisations beginning carbon reporting for the first time.
How emissions scopes connect to SECR
SECR reporting has a specific UK statutory context for qualifying organisations. Emissions scopes are relevant because SECR disclosures commonly involve energy consumption and associated emissions, including Scope 1 and Scope 2 sources and certain Scope 3 elements where applicable.
Organisations should confirm their legal reporting obligations with appropriate professional advisers. Switch Neutral can support the reporting preparation process, but does not provide legal, audit, assurance or statutory filing advice. For more detail, see our SECR reporting support page.
Common mistakes when reporting Scope 1, Scope 2 and Scope 3
- Mixing scopes together: reporting all emissions as one total without explaining the categories.
- Overstating Scope 3 certainty: presenting estimated data as though it is complete or verified.
- Ignoring boundaries: failing to define which sites, entities or activities are included.
- Using inconsistent assumptions: changing calculation methods year to year without explanation.
- Missing evidence trails: reporting figures without clear source records or calculation schedules.
- Confusing reporting with certification: assuming a carbon report means carbon neutral or net zero certification.
- Including irrelevant categories: adding Scope 3 categories that are not useful, material or supported by evidence.
What evidence should businesses collect?
Evidence requirements depend on the reporting boundary and the emissions sources included. Most organisations should start by gathering the records that are already available, then identify gaps and improve data capture over time.
- Electricity, gas and fuel invoices
- Meter data or supplier consumption statements
- Fuel card records and vehicle mileage information
- Refrigerant service records where applicable
- Business travel records
- Waste and recycling data
- Logistics, freight or courier records where relevant
- Supplier emissions data or activity data where available
- Site, entity and department lists
- Notes explaining estimates, exclusions and assumptions
A practical reporting approach for UK businesses
A practical approach is usually better than trying to produce a perfect report immediately. Businesses should define the purpose of the report, agree the boundary, gather core evidence, calculate Scope 1 and Scope 2 where relevant, and then assess which Scope 3 categories are useful and supportable.
Over time, the reporting process can become more mature. Data requests can be standardised. Evidence naming can be improved. Supplier data can be requested earlier. Assumptions can be reduced. Reporting quality can improve year by year.
How Switch Neutral can help
Switch Neutral produces evidence-led carbon reporting outputs for UK organisations, including Scope 1, Scope 2 and relevant Scope 3 emissions reporting, carbon footprint reports, audit-ready evidence packs and methodology notes.
Our position is deliberately careful. Scope 3 is included where relevant and where suitable data is available. We do not imply that every organisation can report every Scope 3 category completely in year one. We also do not provide assurance, verification or certification.
Scope 1, Scope 2 and Scope 3 FAQs
What are Scope 1, Scope 2 and Scope 3 emissions?
Scope 1 emissions are direct emissions from owned or controlled sources. Scope 2 emissions are indirect emissions from purchased energy. Scope 3 emissions are other relevant indirect emissions from wider business activity and the value chain.
Are Scope 3 emissions required for every carbon report?
No. Scope 3 emissions should be included where they are relevant to the reporting purpose and where suitable evidence is available. Many organisations start with Scope 1 and Scope 2 before expanding into relevant Scope 3 categories.
Which scope usually matters most for a business?
It depends on the business. A manufacturer may have significant Scope 1 and Scope 2 emissions, while a service business may have lower direct emissions but relevant Scope 3 emissions from travel, purchased goods, commuting or suppliers.
Can Scope 1 and Scope 2 be reported before Scope 3?
Yes. Many organisations build a reliable Scope 1 and Scope 2 baseline first, then expand into relevant Scope 3 categories as data quality and reporting maturity improve.
How do emissions scopes relate to SECR reporting?
SECR reporting commonly involves Scope 1 and Scope 2 energy and emissions data, with certain Scope 3 elements where relevant. Organisations should confirm their statutory reporting requirements with appropriate professional advisers.
Does Switch Neutral verify Scope 1, Scope 2 or Scope 3 reports?
No. Switch Neutral does not provide assurance, verification or certification. The service focuses on producing evidence-led carbon reporting outputs, methodology notes, calculation schedules and evidence packs.
Related pages
Continue with our Scope 1, Scope 2 and Scope 3 reporting service, carbon footprint reporting, carbon reporting evidence guide, SECR reporting support, and methodology pages.
Need help with emissions reporting?
Contact Switch Neutral to discuss your reporting boundary, evidence quality, emissions sources and next steps.