What Are Scope 1, 2 and 3 Emissions? A Guide for UK Businesses

Quick Answer: What are Scope 1, 2 and 3 emissions? They are the three categories used to measure greenhouse gas emissions generated directly by a business, indirectly through purchased energy, and throughout its wider value chain, helping organisations understand and reduce their overall carbon footprint.

What are Scope 1, 2 and 3 emissions?

As sustainability becomes increasingly important across the UK business landscape, understanding carbon emissions is no longer just a concern for large corporations. Organisations of all sizes are being asked by customers, regulators, investors and suppliers to demonstrate their environmental performance and reduce their impact on climate change.

To create consistency in carbon reporting, emissions are commonly divided into three categories known as Scope 1, Scope 2 and Scope 3 emissions. These classifications, established by the Greenhouse Gas Protocol, are now widely used throughout the UK and internationally.

Each scope represents a different source of greenhouse gas emissions connected to a business. Together, they provide a complete picture of an organisation’s carbon footprint and help identify opportunities for improvement.

Scope 1 covers emissions produced directly by a business. Scope 2 relates to emissions generated from purchased energy. Scope 3 includes all other indirect emissions associated with the organisation’s activities, suppliers, products and services.

Understanding these categories is the first step towards effective carbon management, accurate reporting and meaningful emissions reduction.

Why emissions scopes matter for UK businesses

Carbon reporting has evolved significantly over recent years. Businesses are increasingly expected to measure, monitor and reduce emissions throughout their operations. Understanding emissions scopes helps organisations comply with reporting requirements, improve efficiency and strengthen their competitive position.

Reporting requirements

Many UK organisations are already subject to environmental reporting obligations. Schemes such as Streamlined Energy and Carbon Reporting (SECR), Energy Savings Opportunity Scheme (ESOS) and various sustainability frameworks require businesses to understand and disclose their emissions.

While reporting obligations vary depending on company size and structure, having accurate emissions data is becoming increasingly important. Investors, lenders and stakeholders are also requesting more detailed carbon information when assessing business performance and risk.

Understanding Scope 1, 2 and 3 emissions creates the foundation for accurate reporting and regulatory compliance.

Supply chain pressure

Large organisations are increasingly examining the environmental impact of their supply chains. As a result, suppliers are often asked to provide carbon emissions data as part of procurement processes.

Businesses that can demonstrate a clear understanding of their emissions are often better positioned when bidding for contracts or maintaining supplier relationships. As net zero commitments become more widespread, supply chain carbon transparency is becoming a standard business expectation rather than an optional extra.

Cost reduction opportunities

Measuring emissions often highlights areas of waste and inefficiency. Businesses frequently discover opportunities to reduce energy consumption, fuel use and operational costs through carbon assessments. Lower emissions often go hand in hand with lower expenditure on electricity, gas and transport.

By identifying significant emission sources, organisations can prioritise initiatives that deliver both environmental and financial benefits.

What is Scope 1?

Scope 1 emissions are direct greenhouse gas emissions generated from sources that a business owns or controls. These emissions occur as a direct result of everyday business operations and are generally the easiest emissions to identify and measure.

Business gas use

Natural gas consumption is one of the most common Scope 1 emission sources for UK businesses. It is used for heating offices, warehouses, factories, retail premises and other facilities, creating direct carbon emissions when burned. Boilers, furnaces and heating systems contribute to a company’s Scope 1 footprint whenever they consume fossil fuels.

For many organisations, gas heating represents a substantial proportion of direct emissions, particularly in energy-intensive industries.

Company vehicles

Vehicles owned or operated by a business also generate Scope 1 emissions.

Examples include:

• Company cars
• Delivery vans
• HGV fleets
• Maintenance vehicles
• Forklifts powered by fossil fuels

Every litre of petrol or diesel consumed creates greenhouse gas emissions that fall under Scope 1 reporting. Businesses with large transport operations often identify fleet emissions as one of their most significant carbon sources.

On-site fuels

Many organisations use fuels directly on-site for operational processes.

Examples include:

• Diesel generators
• Industrial equipment
• Manufacturing processes
• Backup power systems
• LPG-powered machinery

Because these fuels are burned directly by equipment under the organisation’s control, the resulting emissions are classified as Scope 1.

What is Scope 2?

Scope 2 emissions are indirect emissions associated with purchased energy consumed by a business. Although these emissions occur at the energy generation source rather than on-site, they are still attributed to the organisation using the energy.

Purchased electricity

Electricity consumption is the most common Scope 2 emission source. Whenever a business purchases electricity from the national grid, greenhouse gas emissions are generated during electricity production. Even though the emissions occur at power stations rather than company premises, they remain connected to business operations.

Office buildings, retail stores, factories, warehouses and hospitality venues all generate Scope 2 emissions through electricity use.

Heat and steam

Some organisations purchase heating, cooling or steam from external providers. Where energy is generated elsewhere and supplied to business premises, the associated emissions fall within Scope 2 reporting requirements.

This category is particularly relevant in industrial facilities, district heating networks and specialised manufacturing environments.

Renewable tariffs

Many organisations choose renewable electricity tariffs as part of their sustainability strategy. Renewable energy contracts can help reduce reported Scope 2 emissions, depending on the structure of the tariff and associated certification. Businesses may also invest in Power Purchase Agreements (PPAs) or on-site renewable generation to further reduce their carbon footprint.

Reviewing electricity procurement strategies can therefore play an important role in emissions reduction programmes.

What is Scope 3?

Scope 3 emissions include all other indirect emissions generated throughout a company’s value chain. These emissions are often the largest component of an organisation’s carbon footprint, along with generally being the most challenging to measure.

Purchased goods

Everything a business buys carries an associated carbon footprint.

This includes:

• Raw materials
• Equipment
• Office supplies
• Packaging
• IT hardware
• Professional services

The emissions generated during the extraction, manufacturing and transportation of these goods contribute to Scope 3 emissions. For many organisations, such as larger retail operations, purchased goods are among the largest emission categories.

Employee commuting

Employee travel to and from work is generally classified as Scope 3.

Factors that influence commuting emissions include:

• Distance travelled
• Mode of transport
• Vehicle type
• Public transport usage
• Remote working arrangements

Businesses increasingly examine commuting patterns as part of broader sustainability initiatives.

Waste and distribution

Waste management activities create indirect emissions throughout the disposal process. Similarly, transporting products between suppliers, warehouses and customers generates emissions that often fall within Scope 3 reporting.

These sources may include:

• Third-party logistics providers
• Courier services
• Waste collection companies
• Recycling operations
• Distribution networks

Although businesses do not directly control these activities, they remain linked to organisational operations.

Product use

For some industries, emissions generated when customers use products can represent a major Scope 3 category.

Examples include:

• Electrical equipment consuming energy
• Fuel-powered products
• Heating systems
• Industrial machinery

Product lifecycle emissions can extend far beyond the point of sale and often contribute significantly to overall environmental impact.

Scope 1 vs Scope 2 vs Scope 3 emissions

Understanding the differences between the three emissions categories is essential for accurate carbon reporting and reduction planning.

Comparing Scope 1, 2 and 3 emissions

How to identify your business emissions

Building an emissions inventory requires a structured approach. Businesses should focus on gathering reliable data, with techniques like energy audits, reviewing energy bills and more to identify the most significant emission sources first.

Review energy bills

Energy bills provide a valuable starting point for emissions measurement. Electricity invoices support Scope 2 calculations, while gas bills help quantify Scope 1 emissions. Reviewing consumption trends can also identify opportunities for efficiency improvements and cost savings. 

Many businesses already possess much of the data required for initial carbon assessments.

List Fuel Sources

Create an inventory of all fuels used throughout operations.

This should include:

• Natural gas
• Diesel
• Petrol
• LPG
• Heating oil
• Backup generators
• Fleet vehicles

Documenting fuel consumption allows organisations to build an accurate picture of direct emissions.

Map supplier activity

Scope 3 emissions often require businesses to examine their supply chains. Identify key suppliers, contractors and service providers that contribute significantly to operations. Understanding procurement patterns helps prioritise the largest sources of indirect emissions.

Supplier engagement is often critical for obtaining reliable carbon data.

Prioritise large sources

Not all emissions sources contribute equally.

Businesses should focus first on areas with the greatest environmental impact and reduction potential. This approach delivers more meaningful results while making carbon management programmes more practical and cost-effective.

How to reduce scope 1, 2 and 3 emissions

Once emissions sources have been identified, businesses can begin implementing reduction strategies.

Reduce gas consumption

Reducing gas use can significantly lower Scope 1 emissions.

Common measures include:

• Upgrading heating systems
• Improving insulation
• Installing smart controls (lighting, heating, etc.)
• Optimising building management systems
• Electrifying heating where appropriate

Even small efficiency improvements can generate substantial savings over time.

Improve energy efficiency

Energy efficiency remains one of the most effective emissions reduction strategies.

Businesses can reduce electricity demand through:

• LED lighting upgrades
• Efficient HVAC systems
• Equipment optimisation
• Automated controls
• Energy monitoring technologies

Lower consumption reduces both emissions and operating costs.

Review electricity supply

Switching to a new electricity tariff, such as a renewable option, could reduce Scope 2 emissions and support broader sustainability objectives.

Businesses may also consider:

• Solar PV installations
• Battery storage systems
• Corporate PPAs
• Renewable energy procurement strategies

These solutions help reduce reliance on fossil fuel-generated electricity.

Engage suppliers

Reducing Scope 3 emissions often requires collaboration.

Businesses should encourage suppliers to:

• Measure emissions
• Improve efficiency
• Use renewable energy
• Provide carbon data
• Support sustainability initiatives

Strong supplier relationships can drive meaningful improvements across the value chain.

Track progress

Regular monitoring is essential. Tracking emissions over time helps organisations evaluate performance, demonstrate progress and identify new opportunities for improvement. Clear reporting also supports stakeholder communication and compliance requirements.

Scope 1, 2 and 3 emissions examples by business type

Different industries generate emissions in different ways.

Hospitality

Hotels, restaurants and other leisure venues often generate Scope 1 emissions from gas-fired heating and cooking equipment. Electricity consumption contributes to Scope 2 emissions, while food procurement and laundry services frequently create substantial Scope 3 impacts.

Care homes

Care homes typically consume significant amounts of gas and electricity to maintain comfortable environments for residents. Food purchasing, waste management, outsourced services and staff commuting often represent important Scope 3 categories.

Manufacturing

Manufacturers generally produce emissions across all three scopes. Direct fuel use, industrial processes and vehicle fleets contribute to Scope 1. Electricity consumption drives Scope 2 emissions, while raw materials, transportation and product distribution frequently dominate Scope 3.

Offices

Office-based businesses often have relatively low Scope 1 emissions but substantial Scope 2 electricity consumption. Scope 3 emissions may arise from employee commuting, business travel, IT equipment procurement and professional services.

How D-ENERGi supports business carbon management

Managing carbon emissions can be complex, particularly for organisations operating across multiple sites or managing large energy portfolios.

D-ENERGi supports businesses by helping them understand energy consumption through our comprehensive energy services, improving efficiency and identifying opportunities to reduce carbon emissions. Through energy procurement expertise, renewable energy solutions and consumption analysis, businesses can gain greater visibility into the factors driving their carbon footprint.

By understanding where energy is used and where emissions are generated, organisations can make informed decisions that support both sustainability goals and operational performance.

For more actionable insights into the world of business energy consumption and management, check out our extensive blog today. There’s a large archive of pieces just like this for all sorts of curious parties. 

Frequently Asked Questions (FAQs)

What is the difference between Scope 1 and Scope 2 emissions?

Scope 1 emissions are generated directly from sources owned or controlled by a business, such as gas boilers and company vehicles. Scope 2 emissions are indirect emissions associated with purchased electricity, heat or steam consumed by the organisation.

Why are Scope 3 emissions difficult to measure?

Scope 3 emissions involve activities outside a company’s direct control, including suppliers, logistics providers, employee commuting and product use. Gathering accurate data from multiple sources can be challenging and time-consuming.

Are Scope 3 emissions mandatory to report in the UK?

Requirements vary depending on reporting frameworks, regulations and customer expectations. While Scope 3 reporting is not universally mandatory, it is increasingly requested by stakeholders, investors and large supply chain partners.

Which emission scope is usually the largest?

For many organisations, Scope 3 emissions represent the largest share of their total carbon footprint because they encompass a wide range of supply chain and value chain activities beyond direct operations.

How can businesses reduce Scope 1, 2 and 3 emissions?

Businesses can reduce emissions by improving energy efficiency, switching to renewable electricity, reducing fuel consumption, engaging suppliers, optimising transport activities and continuously monitoring performance. A combination of operational improvements and strategic planning typically delivers the strongest results.