The Energy Saving Opportunity Scheme (ESOS)

Phase 3 Compliance Deadline








What is the Energy Saving Opportunity Scheme? 

The Energy Savings Opportunity Scheme (ESOS) is UK legislation (based on article 8 of the EU Energy Directive) which mandates  circa 10,000 organisations in the UK to audit their estates  and establish opportunities for saving energy.

If your business employs more than 250 employees, OR has a turnover and balance sheet exceeding €50 million and €43 million respectively, then you must comply with ESOS. Organisations who fail to comply with the legislation are at risk of receiving a hefty fine of £50,000 from enforcers.

To comply, you will need to submit an ESOS audit that details:

  • Your organisational structure (who the submission covers)
  • Your total energy consumption across a 12-month period that crosses the qualification date
  • Individual energy audits on your property portfolio, fleet & industrial processes
  • An extensive and robust evidence pack that allows the environment agency to audit your submission

ESOS submissions run in 4-year cycles:


Phase Qualification Date Four-Year Compliance Phase Compliance Date
Phase 1 31st December 2014 6th December 2011 to 5th December 2015 5th December 2015
Phase 2 31st December 2018 6th December 2015 to 5th December 2019 5th December 2019
Phase 3 31st December 2022 6th December 2019 to 5th December 2023 5th December 2023


We have compiled some useful tools to help you with your ESOS compliance:


In need of our expert advice?

Compliance365 have a team of expert Energy Consultants and ESOS Lead Assessors, who are on hand to help your organisation achieve compliance. We work with some of the UK’s largest organisations with complex property estates ensuring they meet the tight ESOS deadlines.

What can we do for you?

There is an enormous amount of effort that goes into demonstrating compliance for ESOS. We can help to alleviate the stress associated with the submission by providing a number of solutions which are tailored to meet your organisations requirements.


ESOS Audits

An ESOS audit involves an assessment of the energy used by a company’s buildings, industrial processes and transport. It will identify cost-effective energy saving measures. It also looks to see how an organisation is currently measuring and managing energy consumption along with any quality management systems or policies.

The government’s aim with the scheme is to cut carbon emissions and reduce energy consumption by requiring large businesses to identify energy reduction measures. It is projected that If audits led to an average 0.7% energy saving per enterprise then the potential net benefit of this policy for the UK is estimated at 1.9bn Net present Value between 2015 and 2030 through the implementation of energy efficient measures.

Fleet Assessment

A Fleet assessment reports on the current state of an organisations fleet. It reviews any policies in place surrounding engine sizes of cars, CO2 bands and behavioural training. Recommendations are tailored to mirror your fleet taking into account current good and bad practices.

Evidence Packs

Our Lead Assessor evidence packs provide you with an extensive breakdown of the processes and calculations used to complete an organisations ESOS submission. It can be issued to the Environment Agency should you be called up for audit after registering your compliance.

Property Audit

A property energy audit is an in-depth report which identifies areas energy can be saved within the property. It focuses on 4 key areas of energy and environmental efficiency including:

  • Building infrastructure and property energy consumers
  • Water reduction
  • Behavioural training
  • Waste

These reports detail the savings that can be achieved in £’s, kWh’s and CO2 emissions.

Lead Assessors

We employ a number of qualified ESOS Lead Assessor who have extensive experience working in both the private and public sector on numerous energy and property upgrade projects. They work hand in hand with all our customers, supporting them through the ESOS submission process.

ESOS Requirements:

  • Use 12 months of energy consumption data, from within a specific period;
  • Begin no earlier than 12 months before the commencement of the compliance period;
  • Begin no earlier than 24 months before the commencement of the first ESOS Energy Audit that the participant undertakes in the compliance period (e.g. for an ESOS Energy Audit undertaken on the 1 April 2015, data reported on must begin no earlier than 1 April 2013);
  • Use data not used to support ESOS compliance in a previous compliance period;
  • Produce cost-effective recommendations for the area being audited or confirm that there is no scope for cost-effective energy efficiency improvement;
  • Be overseen, conducted or reviewed by an ESOS Lead Assessor.

ESOS Participants Must:

  • Make an initial estimate of their total energy consumption (covering energy used in buildings, transport and industrial processes);
  • Identify areas of significant energy consumption (which equate to at least 90% of their total consumption), and carry out a more detailed audit of those areas to establish where energy savings could be made, and;
  • Submit a formal notification to the scheme administrator, the Environment Agency (EA)

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