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Energy Savings Opportunity Scheme (ESOS)

What is ESOS?

The Energy Savings Opportunity Scheme (ESOS) is a mandatory energy assessment scheme for organisations in the UK that meet the qualification criteria. The Environment Agency is the UK scheme administrator.

Organisations that qualify for ESOS must carry out ESOS assessments every 4 years. These assessments are audits of the energy used by their buildings, industrial processes and transport to identify cost-effective energy saving measures.

Organisations do not need to pre-register with the Environment Agency but must notify the Environment Agency by the set deadline that they have complied with their ESOS obligations.

How can Energy Saving Trust help?

Energy Saving Trust has a strong track record in assessing transport energy and emissions and we have launched a Transport Energy Assessor training and approval scheme.

By working with ESOS Lead Assessor approval bodies we can reach as many energy assessors as possible and improve the level of knowledge around transport energy, how to reduce energy consumption, improve efficiency and minimise emissions.

Read more about our Transport Energy Assessor Training and Approval Scheme in our ESOS Guide.

For your assessment, you need to:

1. Calculate your total energy consumption

This is the energy used by assets held or activities carried out by your organisation or group. This includes the energy consumed by buildings, industrial processes and transport. To find out how to calculate your total energy consumption read the full ESOS guidance from

2. Identify your areas of significant energy consumption

This is the energy used by assets held, or activities carried out, by your organisation that account for at least 90% of your total energy consumption. You then need to:

a.) find out whether ISO 50001, DECs or GDAs cover any of your areas of significant energy consumption

b.) 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, DECs or GDAs

As long as 90% of your total energy consumption is covered, you can use a mix of approaches with some of your energy consumption covered by ISO 50001; some by DECS or GDAs and some by ESOS energy audits.

3. Appoint a lead assessor

You need to appoint a lead assessor to carry out and oversee or review your energy audits and overall ESOS assessment.

4. Notify the Environment Agency

You need to submit your ESOS notification of compliance to the Environment Agency when you have undertaken an ESOS assessment and are compliant with your obligations.

5. Keep records

You need to keep records of how you have complied with ESOS in an evidence pack. There is no set format for this.

Enquire now

Contact Energy Saving Trust for information on where to find a Transport Energy Assessor.

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