You can also call us on +44 (0)20 7170 7000, or select 'Live Chat' to chat with one of our advisors

ESOS: What next?

All large UK businesses are affected by the Energy Savings Opportunity Scheme (ESOS) regulations. Find out how your organisation can go beyond compliance, implement energy efficiency and cut costs now to take advantage of the real opportunities in ESOS.

As a mandatory program, all large UK businesses are affected by ESOS. The Carbon Trust provides a complete suite of services to help companies achieve compliance with the ESOS regulations in a cost-effective and efficient manner and turn energy-saving opportunities into real business advantage.

We bring a wealth of experience to bear and have worked with dozens of companies to help them comply with ESOS, while reaping the business benefits of energy efficiency.

Get in touch

Email us

Call us on +44 (0)20 7170 7000

Or fill in our contact form


Beyond compliance

Simply complying with the Regulations misses the point of ESOS: to identify opportunities to reduce energy use and to cut consumption, emissions and cost accordingly.

Whilst there is no statutory requirement to take action on these opportunities, not to do so is to reduce ESOS to a costly compliance exercise rather than a means to achieve real savings.

There are proven business benefits in addressing energy efficiency. Typically, 20% of a business' annual energy costs are wasted through the use of energy inefficient equipment. Our expert knowledge and tailored services are designed to make the implementation of energy reduction projects easy.

Since 2001 the Carbon Trust has

  • Delivered over 35,000 energy assessments
  • Introduced £1.6bn worth of energy efficient equipment
  • Helped organisations save over £5.5 billion and reduce CO2e emissions by 60 million tonnes


We know where energy savings can be made and how to get energy efficiency strategies up and running in businesses. 

Read more in our viewpoint: The ESOS deadline has passed: what next?

Guide to implementing Energy Savings Opportunities


This guide has been developed to support businesses in implementing the energy saving opportunities identified from ESOS assessments.  Produced in collaboration with the Department for Energy and Climate Change.

It provides an overview of the steps businesses can take to maximise the impact of their ESOS assessment. It will help organisations follow best practice around the implementation of energy saving opportunities. This guide is particularly aimed at smaller ESOS participants, including those who may have less experience in implementing energy savings and/or may not employ a dedicated energy manager. However, the information in this guide may also be helpful to organisations with previous experience of implementing energy saving opportunities. It may also be helpful to organisations that have identified energy saving opportunities independently of ESOS.

What is ESOS?

The ESOS Regulations 2014 bring into force Article 8 of the EU Energy Efficiency Directive and mandate that all large businesses in the UK undertake comprehensive assessments of energy use and energy efficiency opportunities at least once every four years.

The deadline for the first compliance period is 5 December 2015, by which time qualifying businesses will have to achieve compliance with the regulations and notify the Environment Agency.

The criteria for inclusion to ESOS is not entirely straightforward, but essentially it applies to any large undertaking that carries out a trade or a business (typically a Company), and any corporate group where at least one member of the UK group meets the ESOS criteria.

  • A large undertaking is one that employs at least 250 people or has an annual turnover in excess of €50 million and a balance sheet in excess of €43 million. Most public sector bodies are excluded, but some, such as many Universities may qualify.


To comply with the regulations, a ‘Lead Energy Assessor’ will need to conduct an ESOS Assessment to:

  • Measure your total energy consumption for buildings, industrial processes and transport
  • Identify areas of significant energy consumption, accounting for at least 90% of your total energy consumption
  • Identify cost-effective energy efficiency recommendations for areas of significant energy consumption
  • Report compliance to the Environment Agency

Organisations may not need to undertake the Assessment if are fully covered by ISO 50001.   

We are also working with organisations to help them achieve ISO 50001.  Call our advisors on +44 (0)20 7170 7000 to find out more about these services or see our ISO 50001 services.

The Carbon Trust approach to ESOS

The qualification criteria and requirements of ESOS are complex and many organisations will need to take substantive steps in order to comply.

We offer a modular set of ESOS services to help companies achieve compliance in a cost effective manner, whilst at the same time highlighting the options for reducing energy consumption and maximising the associated business benefits.

With qualified Lead Energy Assessors available to review and guide the approach, our ESOS services can provide support right the way through to full ESOS Compliance and are based on a modular approach that allows services to be selected depending on your individual circumstances:

  • Delivery of organisational footprint:
    • Template to facilitate compliance footprint
    • Analysis of current footprint with energy and carbon hot-spotting advice
  • Detailed ESOS audit strategy:
    • Audit methodology, Assessor strategy, Data readiness
    • Specification of compliance plan and detailed budget
    • Full ESOS compliance audit by qualified Lead Energy Assessor

An entry-point service is also available for organisations who want to ensure that they are prepared for audit and compliance, comprising the following:

  • Web-delivered questionnaire for input data
  • Half-day, facilitated workshop
  • Readiness review, detailing:
    • Approach for compliance (including disaggregation)
    • Boundary definition
    • Audit reference period
    • High level view of Data readiness, Assessor strategy, Audit Methodology

This service pack has been deliberately designed to allow organisations at all stages of energy maturity access to class-leading energy and carbon management expertise.

The Carbon Trust Guide to ESOS


We recognise that many companies will need advice on how to comply with ESOS so we have compiled the Carbon Trust Guide to ESOS that provides practical advice and a summary of how the Carbon Trust can help.

The guide (updated October 2015) covers:

  • ESOS Background and policy aims
  • How will it affect my business?
  • How do I comply with the regulations?
  • What are the benefits of ESOS to my business?
  • How can the Carbon Trust help me?
  • Achieving the real value of ESOS
  • Appendix - Approved registers of lead assessors

How the Carbon Trust can help


The Carbon Trust can help you comply with the ESOS regulations and go beyond to take advantage of the business opportunities to be gained from energy efficiency.

Our services include:

To find out more call us on +44 (0)20 7170 7000, email us on, or fill in our contact form.


Full guidance on ESOS can be found on the GOV.UK website.

Back to top