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ESOS - What is it?

The Energy Savings Opportunity Scheme (ESOS) is a mandatory energy assessment and energy saving identification scheme for large companies (and their corporate groups). The scheme applies throughout the UK. It was brought into law under ESOS Regulations 2014 to implement Article 8 (4-6) of the EU Energy Efficiency Directive (2012/27/EU).


ESOS is a mandatory energy assessment scheme for organisations in the UK that meet the qualification criteria - . The scheme is administered and policed by The Environment Agency.


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 must notify the Environment Agency by a set deadline that they have complied with their ESOS obligations.

Who qualifies?


You are likely to be in scope of ESOS if, on the qualification date (31 December 2014 for the first phase of ESOS), you are:


  1. A company or Group which has 250 or more employees

  2. A company or group which has fewer than 250 employees, but has an annual turnover exceeding €50m and a balance sheet exceeding €43m.

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

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