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Organisations that qualify for 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 one or both of the following criteria for two consecutive years on or before 31st December 2022.

  • More than 250 employees in the UK

  • A turnover exceeding £44.1m and a balance sheet exceeding £37.9m on 31st December 2022


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 have to report your compliance to the Environment Agency by the 5 June 2024.

Qualification date

31 December 2022

Compliance period

From 6 December 2019 to

5 June 2024

Compliance date

5 June 2024

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.  

What do the energy assessments involve?

The assessments are the energy audits of a company’s buildings, industrial processes and transport which identify cost-effective energy-saving plans.

To comply you must:

  • Measure 12-month energy consumption for buildings, industrial processes and transport

  • Identify the significant areas of energy consumption which account for >95% of your total energy consumption

  • Conduct energy audits to find energy efficiency solutions for any high-consumption areas

  • Appoint a ‘Lead Energy Assessor to review your ESOS Assessment

  • Report your compliance to the Environment Agency portal by the 5th June 2024

We can provide an ESOS Phase 3 cradle-to-grave service delivered by our in-house ESOS Lead Energy Assessor.

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

Compliance Services

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