ESOS Energy Savings Opportunity Scheme


What Is It?

The ESOS Energy Savings Opportunity Scheme is a brand new mandatory energy assessment and energy saving identification scheme for businesses in the UK.

The ESOS Energy Savings Opportunity Scheme aims to save the UK at least £1.6bn in energy costs by the year 2030.

How do I become a Lead Assessor & how can I register?

To be able to become a registered Lead Assessor with The ESOS Register, you will need to meet the following criteria:

  1. 1. Have at least 2 years of relevant experience in the industry
  2. 2. Be a DEC and/or NDGDA and/or Commercial L3/L4 Energy Assessor
  3. 3. Attend an approved ESOS Lead Assessor training course *
  4. 4. Pass a time limited test
  5. 5. Submit your  application along with your documents by following the ‘Apply now’ section


As Display Energy Certificates are not applicable in Scotland, assessors based there would only be required to have commercial qualification to enroll on the ESOS training course and the register (as long as they have 2 years of relevant experience).

*Please note that this course will not give you a qualification. Working as a Lead Assessor will require assessors to meet the competencies set out in the PAS 51215:2014 document which can be purchased here


The ESOS Energy Savings Opportunity Scheme mandates energy audits for around 9,000 UK businesses.

You are likely to be in the ESOS Energy Savings Opportunity Scheme if, on the qualification date of 31st December 2018 for the second phase of ESOS) you are:

-An Undertaking which has 250 or more employees in the UK.
-An Undertaking which has fewer than 250 employees, but has:
-An Annual turnover exceeding €50m and,
A balance sheet exceeding €43m

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


ESOS Opportunities Include

-Lead assessors will manage teams which could include Non Domestic Energy Assessors.

-An ESOS Report will measure the energy consumption for buildings, transport or processes.

-Only a registered lead assessor can sign off on an ESOS audit.

-Over 10,000 UK companies will require an ESOS report before December 2018

-A great opportunity for DEC Assessors to take advantage of this new industry.


How do I benefit from ESOS as an energy assessor?

Large companies have to comply with ESOS until 5th December 2015. As every ESOS report has to be signed off by a Lead Assessor, there will be a big demand for experienced commercial assessors who meet the competencies set out in the PAS 51215:2014 document.

Please note that you have to meet the above mentioned competencies and become part of an Approved Register to be able to work as a Lead Assessor. However that does not mean that DEC and Commercial assessors cannot be involved in the ESOS scheme. Lead Assessors can work with as many assessors as necessary to be able to gather the required data for an ESOS report.

Whether you are an energy assessor looking to work for a Lead Assessor or a company looking for a Lead Assessor for an ESOS report, you can get in touch with our Approved Lead Assessors whose details will be listed on our website shortly under ‘Approved Lead Assessors’.


ESOS Compliance Periods and Deadlines



The Critical Dates for Phase 2

Qualification Date: 31 December 2018. This is the date used to define an organisation’s structure to decide if it qualifies for ESOS. If the group, based on the highest worldwide parent on the 31 December 2018, has a UK undertaking which meets the criteria of a large organisation then the whole group is required to participate in ESOS.

Compliance Date: 5th December 2019. This is the date by which all participants must have completed their ESOS commitments and submitted a notification to the EA.

Please note that an organisation who knows they will qualify for ESOS can be carrying out audits now as we are already effectively in Phase 2.

Find Out More

Please take a look at the full ESOS guide issued by the government for full details on the scheme including requirements and deadline dates.

Participants of The ESOS Energy Savings Opportunity Scheme will require a ‘lead assessor’ (please take a look at paragraph 5.1 in the guide link above) to undertake various roles in relation to their ESOS assessment.