Energy Savings Opportunity Scheme (ESOS) Services

Energy Savings Opportunity Scheme (ESOS) Services

Guarantee your ESOS compliance with TEAM

What is ESOS?

The Energy Savings Opportunity Scheme (ESOS) was introduced to incentivise large UK based businesses to implement energy saving measures and help reduce the UK’s carbon emissions as we work towards becoming net zero by 2050. The scheme requires affected businesses to carry out energy surveys accompanied by cost-effective recommendations to reduce energy demand and improve their energy efficiency. It is a mandatory requirement for organisations that must comply to produce an audit over a 12-month period once every four years.

New legislation from the UK Government included an extension to the ESOS Phase 3 deadline and additional guidance on new requirements for organisations to meet. 

Who needs to comply with ESOS? 

Companies need to comply if they are: 

  • Registered or based in the UK or a UK establishment 
  • Employ 250 people or more or
  • Have an annual turnover greater than £44m, and an annual balance sheet greater than £38m 

SMEs and public-sector bodies are generally exempt from the ESOS scheme. It is expected that with the introduction of Phase 4 to the ESOS scheme, the Government will change the ESOS balance sheet and turnover thresholds to align with SECR, requiring more organisations to report on their ESOS.

ESOS Energy Scheme Compulsory Phases 

We are currently in Phase 3 of the scheme. Audits must be completed and reported to the Environment Agency by 5 June 2024.

However, the Environment Agency will not take action against organisations that do not comply with this deadline, providing they register their account with the new IT system by 5 June 2024, and submit their notification of compliance by 6 August 2024. The regulatory enforcement extension period will end after 6 August 2024.

ESOS help is available from certified consultants if you need support with any of the phases.

The timings of each ESOS phase is shown here:

 Qualification Date4 Year Compliance PhaseCompliance Date
Phase 131 Dec 20146 Dec 2011 – 5 Dec 20155 Dec 2015
Phase 231 Dec 20186 Dec 2015 – 5 Dec 20195 Dec 2019
Phase 331 Dec 20226 Dec 2019 – 5 June 20245 June 2024
Phase 431 Dec 20266 Dec 2023 – 5 Dec 20275 Dec 2027

There has been some new requirements that have been introduced to ESOS Phase 3, to increase the carbon and cost savings made from the scheme.

In Phase 3 of your ESOS submission you will need to:

  • Ensure at least 95% of your total energy consumption is covered, which has increased from 90% that was required in Phase 2
  • Provide more detail on the calculation of your energy consumption
  • Share details of your ESOS report with all members of your organisation
  • Include specific information on how you plan to make energy saving opportunities throughout your business, this includes costs, benefits and how you plan to implement them
  • Explain how the site visits that were carried out is a representation of your organisation’s energy use
  • ESOS Phase 3 now requires all participants to produce an ESOS report, including those using alternative compliance routes such as the ISO 50001 energy management system
  • Submit a yearly Energy Action Plan following your ESOS Phase 3 submission
  • Submit a yearly Progress Update which will explore how successfully you are implementing your energy saving opportunities
  • The Environment Agency will publicly disclose your ESOS data, by publishing the information in your compliance notification, as well as publishing your Action Plan and Progress Reports

Learn more about ESOS Phase 3. 

Yes, the UK Government has confirmed an introduction of Phase 4. It is expected that with this, the Government will change the ESOS balance sheet and turnover threshold to align with Streamlined Energy and Carbon Reporting (SECR) and therefore bring more organisations into scope.

The new Phase will also have a focus on energy efficiency and net zero, as well as emissions reduction trajectories and information to help organisation put together a net zero plan or help them meet their existing plans. 

The deadline for Phase 4 of the ESOS scheme is 5 December 2027, with a compliance period of 6 December 2023 – 5 December 2027. However, it is never too early to get started, site energy audits can start from January 2024. If you need support with any of the ESOS Compliance Phases, our ESOS consultants will help guarantee your compliance.

Learn more about ESOS Phase 4. 

Our team of CIBSE Accredited Low Carbon Assessors, Low Carbon Consultants and ESOS Lead Assessors can help you make the most of the ESOS energy scheme. They gained valuable insights during ESOS Phase 1 and 2 in supporting clients through the Environment Agency audit, which will benefit businesses in the ESOS Phase 3 compliance process. 

Our team of ESOS consultants can support you in the following ways: 

  • Help you fully understand the ESOS scheme and what it means for your business 
  • Collate data for your building, transport and process energy use 
  • Analyse your data and energy consumption 
  • Review your portfolio to determine the number of energy surveys required within the site sampling requirements 
  • Carry out the building(s) energy surveys 
  • Produce the ESOS survey reports including cost-effective energy efficiency recommendations 
  • Maximise the ESOS scheme benefits 
  • Conduct the ESOS review, verification and sign-off 
  • Prepare the ESOS submission document, evidence pack and sign-off 
  • Review your ESOS audit results 
  • Respond to any queries or support on audits conducted by the Environment Agency. 

If a qualifying organisation doesn’t meet the deadline, they can expect to receive a basic fine of £50,000, plus an additional fine of £800 per day up to a maximum of 80 days. 

Infographic showing the stages of the ESOS delivery

Mandatory reporting for ISO 50001 Users

One of the biggest changes to ESOS Phase 3 will affect organisations that are certified under ISO 50001. Previously, these organisations have been exempt from ESOS reporting. 

However, following on from recent changes to ESOS, these organisations will need to submit detailed reporting that includes data on energy savings achieved by the business since the previous compliance period. 

Find out more about ISO 50001 Energy Management System.

ESOS Phase 3 Energy Action Plan Submissions

Organisations will be expected to submit Energy Action Plans to provide annual progress updates to track whether they have achieved the energy saving actions in their plan. Find out more about ESOS Action Plan reporting.

Below, we have included the submission dates for the ESOS Phase 3 Action Plan:

Submission Phase ESOS Phase Compliance and Action Plan Results New Action Plan Action Plan Annual Progress Update Action Plan Annual Progress Update
Phase 3 Action Plan
5 December 2024
5 December 2025
5 December 2026
Phase 4 Action Plan
5 December 2027
5 December 2028
5 December 2029
5 December 2030

Meet our ESOS Consultants

Our in-house, experienced, ESOS consultants will help you fully understand the ESOS scheme and what it means for your business. Each consultant has the breadth of skills, expertise and sector experience to help you make the most of the ESOS energy scheme.

BSc (hons), Approved EnCO Practitioner, ESOS Lead Assessor

BSc (Hons), EnCO Consultant, ESOS Lead Assessor

BSc (Hons), MSc, ESOS Lead Assessor

What our customers say

"A very friendly and professional service, the team were able to support us in meeting a very tight deadline."
Iain Bruce
Director, Retail Marketing Group Ltd

Speak to one of our ESOS consultants

Call 01908 690018 and find out how our consultants can help you make the most of the ESOS energy scheme  


Streamlined Energy and Carbon Reporting

Read all our blogs and insights on ESOS

Power to make change

We believe that people power can change the world. We are here to help you have a positive impact on the planet. Together we can make a difference.

Take the next step

Becoming Net Zero

Leading by example, we became carbon neutral in 2023 and are committed to achieving net zero business emissions by 2030.

Read our strategy

Employee Ownership

As an Employee Ownership Trust we embrace the three pillars of good communication, governance and leadership, putting our people first.

Learn more about us

We will be by your side

Staying at the forefront of industry, we embrace and drive change, delivering solutions at pace and scale to meet the modern challenges of energy and sustainability.

Meet our people