What is ESOS Compliance?

ESOS compliance (Energy Saving Opportunity Scheme) was launched by the Department of Energy and Climate Change (DECC). This scheme is a mandatory energy assessment and energy savings identification scheme for ‘Large Enterprises’ that was undertaken in December 2015. ESOS has now entered Phase 3 and qualifying companies have until December 5th 2023 to comply.

The ESOS Compliance scheme is estimated to lead to £1.6 billion net benefits to the UK, with the majority if these being felt directly by businesses as a result of energy savings. ESOS energy audits have the potential to increase business profitability and competitiveness by implementing energy efficiency measures identified through audits.  These can have wider benefits such as reducing other costs (e.g. maintenance costs) and also increasing employee engagement within your organisation.

Does your organisation qualify?

EU member states must introduce independent and cost-effective energy audits for all large enterprises.

Large enterprises are defined as:

  • Employing more than 250 employees
  • And /or has an annual turnover in excess of £44 million and an annual balance sheet total in excess of £38 million

Please note that the public sector is not required to participate

How do you comply with ESOS?

In simple terms, an ESOS Assessment requires you to do three things:

  • Measure your total energy consumption
  • Conduct energy audits to identify cost-effective energy efficiency recommendations
  • Report compliance to the Environment Agency (as the scheme administrator )

Organisations may not need to undertake an ESOS Assessment if they’re fully covered by ISO 50001.

The deadline for the 3rd Phase compliance period is 5 December 2023, by which time qualifying businesses will have to achieve compliance with the regulations and notify the Environment Agency.

The Energy Savings Opportunity Scheme (ESOS) carries with its reporting mandate some hefty penalties for non-compliance, so don’t delay in commencing your ESOS compliance activity.

How we can help

Blackmores specialise in helping you to implement and maintain your ESOS Assessment across London, Hertfordshire and Bedfordshire, and UK wide. We can also assist with International locations, having experience of working in 27 other countries.

  • Conduct a Gap Analysis – To help establish your strengths and weaknesses.
  • ESOS E-learning – Learn at your own pace with our online courses via the isologyhub and Carbonologyhub
  • ESOS isologists® – We have a skilled team of consultants to help you carry out Energy Audits. From London to the UAE, we have experience working internationally across many sectors.
  • Internal Audits – We can help you to plan and conduct Internal Audits to verify your ESOS compliance

We have a FREE ESOS guide available on request, simply Contact Us.

We also have two ESOS focused episodes available on The ISO Show:

An Introduction to ESOS

How to comply with ESOS


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Listen to our Podcast

We have also created a podcast series for ESOS, listen here:

Comply with ESOS
Introduction to ESOS

What our clients have to say

We engaged Blackmores to develop our ISO 9001, 14001, and 45001 management system from scratch. Throughout the creation and development stages of our ISO journey, Anju Punetha demonstrated remarkable patience, knowledge, and understanding as our dedicated consultant.

During our internal audit preparations, Ian Battersby’s meticulous attention to detail and thorough approach ensured we were well-prepared for our external audit, which we passed with flying colours. His guidance during the external audit was invaluable.

Based on our engagement and experience, I highly recommend the entire Blackmores team. If you’re considering pursuing ISO accreditations, Blackmores should be your first choice.

Graeme Adam

The support and advise I get from our assigned auditors is immense. Forward planning for the following year is great and they are flexible and always willing to help.

Kalil Vandi

“Blackmores have assisted us almost since the start of our adoption of the ISO 9001 quality standard. Their input has improved our processes since the start, and enabled our goal of continuous improvement to be achieved. The people are also extremely easy to get on with, and they really understand our business, giving us a great deal of confidence in their advice.”

David Gibson

Photon Lines Ltd

“Blackmores are the perfect bridge between working on your ISO as an individual or company, to being audited each year.  We find that any queries we have are covered and we feel sure that we have everything as needs be before going into an external audit.”

Mandy Welsby

Jaama Ltd

“We have been extremely impressed with the service and support provided by Blackmores.  There knowledge and assistance through out our ISO journey has been amazing!”

Philip Hannabuss

Dome Consulting

“Blackmores have really kept us on our toes with the broad scope and level of detail they apply to our internal audit schedule. They always stay abreast of ISO standard changes and help us to adapt our processes and documents to embrace these changes accordingly. Having Blackmores shadow our external audits provides invaluable confidence and peace of mind – would highly recommend their services!”

Phil Geens

Kingsley Napley

“Our ISO 27001 certification project has gone so well, that there was no doubt in who we were going to ask to help us with our aspirations of becoming ISO 14001 certified. It’s been an absolute pleasure working with Blackmores, and we are really looking forward to working with them for the foreseeable future.”


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The Blackmores ISO Roadmap is a proven path to go from idea to launching your ISO Management System.

Whether you choose to work with one of our isologist consultants or work your own way through the process on our isology Hub, we’re certain you’ll achieve certification in no time!