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ESOS Compliance

kW Energy Consultants are here to help you achieve ESOS compliance. Our expert team of ESOS lead assessors will work alongside your business to complete your ESOS audit and help implement energy efficiency and money saving solutions to save you money in the future, and reduce the damaging environmental impact of your organisation.
For more information and to find out how we can help your business get in touch today.

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ESOS Compliance: Welcome

ESOS Phase 3

The Energy Savings Opportunity Scheme (ESOS) is a mandatory scheme introduced by the UK government for organisations meeting the qualification criteria. The participating businesses and enterprises must undertake regular energy audits to seek opportunities to save on energy and carbon emissions. The scheme is administered by the Environment Agency in the UK.
Mandatory ESOS audits occur in four-year cycles, so qualifying organisations must carry out an ESOS audit every four years. These assessments are to audit the energy efficiency of their buildings, transport and industrial processes to identify cost-effective energy-saving measures.
During each phase of ESOS, organisations must notify the Environment Agency by a set deadline that they have complied with their ESOS obligations. The deadline for notification of compliance for ESOS Phase 3 is December 2023; this sounds like a long way off, but will come around quickly, so the time to act is NOW.

ESOS Compliance: Text

Do you qualify for an ESOS Audit?

ESOS applies to large UK undertakings and their corporate groups. It mainly affects businesses but can also apply to not-for-profit bodies and any other non-public sector undertakings that are large enough to meet the qualification criteria. Public sector organisations do not usually need to comply with ESOS.


An organisation qualifies if it meets the ESOS definition of a large undertaking, and corporate groups qualify if at least one UK group member meets the ESOS definition of a large undertaking.


A large undertaking is defined as:

  • any UK company that;

    • employs 250+ people, or;

    • has an annual turnover exceeding €50,000,000 and an annual balance sheet exceeding €43,000,000

  • any overseas organisation with a UK registered establishment which has 250+ UK employees that are paying income tax in the United Kingdom.


For more information on whether your company meets the requirements for taking part in ESOS, view the government ESOS advice page. Alternatively, get in touch and one of our qualified assessors can advise you.

ESOS Compliance: Text
ESOS Compliance: Text

Completing your ESOS Audit

There are several steps you must take to complete your ESOS assessment:

1 - Calculate total energy consumption


You must calculate the total energy used by your company or group’s assets and activities. This total includes energy consumed by buildings, transport and industrial processes.

2 - Identify areas of significant consumption

This is the energy used by your company that accounts for at least 90% of your total energy consumption. You need to identify whether ESOS compliant energy audits have been, or need to be, carried out for the areas of significant energy consumption not covered by ISO 50001 or DECs. Our skilled assessors at kW Energy Consultants can advise you on areas where you may be exempt from ESOS assessments.

A change in regulations for Phase 3 is currently underway and it is likely that 95% of total energy consumption will have to be covered; this vastly increases the likelihood that areas such as transport will need to be audited as well.

3 - Appoint an ESOS lead assessor


An ESOS lead assessor is needed to carry out and review your ESOS audits and assessments. That’s where we come in. Our team of experienced energy assessors will work with you to achieve ESOS compliance and find cost-effective energy solutions, and advise you on areas for improvement along with an indication of the energy and cost savings that could be achieved.

4 - Notify the Environment Agency


Once we have completed your ESOS audit and confirmed that you have achieved compliance with your obligations as an organisation you must notify the Environment Agency of your ESOS compliance.

5 - Keep records


Throughout the whole ESOS audit process, you must keep records showing how you have achieved compliance. This will include the reports and analysis provided by our lead energy assessors.

ESOS Compliance: Text

Achieving Compliance from your ESOS Assessment

There are three key criteria that must be met in order to achieve compliance from your ESOS energy audit:

1 - The audit must be based on 12 months’ verifiable data

This data must be for a continuous 12 month period and must not have already been used for an energy audit from a previous ESOS phase. The data cannot be taken from more than 24 months before the start of the ESOS assessment.

For Phase 3, the assessment period must include 31st December 2022; so the assessment period can start on any date between 1st January 2022 and 6th December 2022 (deadline is 5th December 2023). As a result, the ESOS process can start now by gathering data and conducting site audits.

2 - The audit has to analyse your energy consumption and efficiency

Our ESOS lead assessors will analyse and profile your organisation’s energy consumption to identify the ways in which energy is used and where inefficiencies lie.

3 - Your ESOS assessment must identify energy-saving opportunities for your organisation

ESOS stands for Energy Savings Opportunity Scheme, so it makes sense that this plays a vital role in the audit. At kW Energy Consultants our qualified ESOS lead assessors will work with you and analyse the data from your assessment to identify cost-effective, practical opportunities to reduce your organisation’s energy consumption. Our recommendations will include estimated costs and benefits of implementing the measures so that you have a full understanding of the suggestions made. This will enable you to calculate the cost-effectiveness of implementing the energy-saving opportunities for your business.

ESOS Compliance: Text


What is the deadline for Phase 3 of ESOS?

The ESOS Phase 3 deadline is 5th December 2023. The Environment Agency must be notified of your compliance by this date.

What is the qualification date for ESOS Phase 3?

31st December 2022 is the qualification date for Phase 3 of ESOS. If your organisation meets the definition of a large undertaking on 31st December 2022, then it is mandatory for you to comply with ESOS Phase 3.

What are the penalties for non-compliance?

The environmental regulator responsible for enforcing compliance of ESOS in your part of the UK could take action against you if you fail to demonstrate compliance. This action could include civil sanctions and significant fines.

Just as important, even if your company does not qualify, can you really afford to ignore your energy consumption?

ESOS Compliance: FAQ

Choose kW Energy Consultants to be your ESOS Lead Assessor

If your organisation qualifies for ESOS, or you think it might, get in touch with us today to find out more about how kW Energy Consultants can help you through the process. Our experienced lead assessors always go the extra mile to provide innovative solutions to your energy problems and will work with you every step of the way, from the initial assessment through to the implementation of the resulting suggestions. It can be a complicated and time-consuming affair, but it can have a lasting beneficial impact on your organisation, and we are here to help. Call us on 07837 941220, email us at or fill out the contact form below to discuss your needs with a member of the kW team. You can also check out our business energy consulting page to see the other services we offer. We look forward to working with you.

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ESOS Compliance: Get a Quote
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