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Organisations that qualify for Energy Savings Opportunity Scheme (ESOS) must carry out mandatory assessments every four years.

These assessments are audits of the energy used by their buildings, industrial processes, and transport to identify cost-effective energy saving measures.

Who needs to comply?


Large companies as defined by the Companies Act 2006 are legally obligated to report on at least 90% of their energy usage if they meet at least one of the following criteria:

  • Turnover of £44 million;

  • Balance sheet assets of £38 million or more;

  • 250 employees or more.

Energy efficiency rating

When is the next ESOS submission date?

If your organisation qualifies, you will need to survey your sites and analyse 12 months data to find energy saving recommendations. You then need to report your compliance to the Environment Agency by the 5 December 2023.

Qualification date

31 December 2022

Compliance period

From 6 December 2019 to

5 December 2023

Compliance date

5 December 2023

Many of the organisations in scope of ESOS will also have SECR obligations and with some smart planning can transition easily from ESOS data reporting to SECR reporting.


If you have a certified ISO 50001 energy management system that covers all your energy use you don’t need to carry out an ESOS assessment - just submit a notification to the regulator.

Speak to one of our Energy Managers today to find out how we can help you comply to achieve full legislative compliance.

Compliance Services


What our customers say...

Linda and the team have helped us manage our energy efficiency for many years through their first-rate procurement service. They always go the extra mile to help us with any day-to-day issues that arise which is invaluable to us. This recent solar panel installation is a good example of the wider energy support they provide to clients which has been excellent from start to finish.


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