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Energy Saving Opportunities Scheme (ESOS)

The Energy Savings Opportunity Scheme (ESOS) is a mandatory energy assessment and energy saving identification scheme for large undertakings (and their corporate groups). The scheme applies throughout the UK.

You are likely to be in scope of ESOS if, on the qualification date (31 December 2022 for the third phase of ESOS), you are:


1. An undertaking which has 250 or more employees


2. An undertaking which has fewer than 250 employees, but has:

o an annual turnover exceeding £38m and

o a balance sheet exceeding £33m


3. Part of a corporate group which includes an undertaking which meets criteria (1) or (2) above

Energy Savings Opportunity Scheme

Complying with

What if I am an SME or public body?

Although SMEs or public sector bodies are not required to participate in ESOS, they could still benefit from voluntarily meeting the ESOS requirements. ESOS provides a framework you may wish to use to help you identify energy efficiency opportunities, e.g. you may wish to use a qualified ESOS Lead Assessor to undertake energy audits of your operations. 

Measure  >  Conduct  >  Report


1. Measure your total energy consumption

Companies must measure their total energy consumption across their buildings, transport and industrial activities.


2. Conduct energy audits to identify cost-effective energy efficiency recommendations

Companies must ensure that at least 90% of total energy consumption is subject to an ESOS compliant energy audit, a Display Energy Certificate, a Green Deal Assessment or a certified ISO 50001 Energy Management System during each phase of the scheme reporting.


3. Report compliance to the Environment Agency (as the scheme administrator)

By 5 December 2023, Companies must notify the Environment Agency (as the scheme administrator) that they have complied with the scheme.

Prior to notifying the Environment Agency, Companies must ensure that ESOS Assessments have been reviewed by a Board-level Director and approved by an ESOS Lead Assessor.

Participants are not required to implement energy efficiency recommendations identified by their ESOS Assessments. However, they will only achieve the financial benefits that arise from avoiding energy waste if they do implement cost-effective recommendations identified.

Frequently Asked Questions

How often do I have to renew my DEC?

I already have an EPC for my building. Do I still need a DEC?

Im new in post. Is there a way I can find out if my building already has a DEC?

How can I improve my DEC rating?

My site has multiple buildings. Can a single DEC cover the whole site?

You may have questions beyond those listed above. Since our founding in 2014, we are proud to have produced over 30,000 (and counting!) Display Energy Certificates, and would be happy to share our expert advice with you. Feel free to drop us a line, either using our contact form below, or by phone on 01179 309689.

Get in touch

If you would like a quote, further information on any of our products or services, or would like to offer feedback on your experience with us, we want to hear from you! Use our contact form here, and one of our team will review and respond to your message within 24 hours. 

Alternatively, give us a call on 01179 309689

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