Energy Savings Opportunity Scheme


Want to save energy and meet compliance obligations?
Our experienced ESOS consultants can help.

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What is The Energy Savings Opportunity Scheme?

The Energy Saving Opportunity Scheme (ESOS) is a mandatory energy assessment scheme for large undertakings and groups containing large undertakings in the UK, designed to encourage businesses to take a proactive approach to energy efficiency and reduce greenhouse gas emissions. Qualifying organisations must carry out ESOS assessments every 4 years through the scheme which is administered by The Environment Agency. These assessments are audits of the energy used by their buildings, industrial processes and transport to identify cost-effective energy-saving measures.

ESOS is separate from the streamlined energy and carbon reporting (SECR) and many organisations in scope of ESOS will also have SECR obligations. Teamwork can help you to ensure the most effective way to meet both ESOS & SECR requirements, through aligned collation of data and auditing of your energy use.

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How it can make a difference to your organisation

Improved energy management

ESOS can help your organisation identify energy-saving opportunities to reduce energy consumption and costs, improving environmental performance

Reassure customers & stakeholders

Customer confidence

Enhance your reputation by demonstrating your responsibility for combating climate change by saving energy and reducing emissions

Carbon footprint

Reduce your carbon footprint through energy efficiency on your pathway to Net Zero

Reduce operating costs

Reduce costs

ESOS Assessments will identify cost-effective energy-saving measures to help to improve your organisation’s bottom line

Measurable results

Compliance obligations

ESOS assessments, approved by an ESOS Lead assessor, will ensure you are compliant with current ESOS regulations and can support other sustainability obligations (e.g. SECR)

Complete framework

Provides a framework for organisations to achieve their energy goals, which in turn improves efficiency, reduces costs and helps mitigate climate change.

Our ESOS Compliance Lifecycle



We will help you understand your obligations and the extent of information that needs to be reported

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Energy Audits & Data Gathering

We will conduct site energy audits and advise you on what energy data needs to be gathered before completing our Energy review and analysis

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ESOS Report & Energy Saving Opportunities

We will provide full site energy survey reports detailing all energy efficiency improvements, energy saving opportunities and report on potential savings in terms of energy and cost with suggested priorities

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Environment Agency submission

Finally, we will provide an ESOS Registered Lead Assessor to complete and sign off on the overall ESOS assessment and support submission of a notification to the Environment Agency

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Why choose Teamwork IMS?

Experienced Professionals

Experienced Professionals

Since 2007, Teamwork has been solving compliance challenges for a huge range of organisations, from SMEs to large international corporates. Our team of professionals includes CISSP, PCI Security Standards Council QSA, MBCI, GDPR, IEMA, ESOS Lead Assessors, NEBOSH and CMIOSH qualified consultants.

Multi-disciplinary team

Multi-disciplinary team

Our knowledge and experience across a broad base of management and technical Standards make us uniquely equipped to help organisations to comply with sustainability requirements and integrate with existing management systems to achieve significant savings and efficiencies.

Part of your business

Part of your business

Our success has been firmly based on two key principles: the ability of Teamwork consultants to look beyond the regulation in question and identify, define and align with the real business drivers of our customers, and our innate ability to become one with our customer’s own management teams.

Global credentials

Global credentials

We have developed and led UKAS-accredited ISO as well as other standard and compliance-based service improvement programmes for private and public-sector organisations across an international client base.

Have you considered multiple standards?

  • Save time and money by completing projects in parallel, for example SECR & ESOS
  • Create an effective framework for reporting and avoid duplication
  • Become globally recognised for best practices
  • Gain a long-term compliance partner with our passionate consultants
  • Add value to your business and strengthen your sales proposition
  • Protect your business from threats by complying with all relevant standards

See all standards…

Related Standards

ISO 50001

ISO 50001

Improve energy efficiency and reduce greenhouse gas emissions.

ISO 14001

ISO 14001

Reduce waste, show your organisation's commitment to the environment.



Streamline your energy & carbon reporting.


Other Sustainability Services

See how we can support you with other sustainability initiatives

Frequently asked questions

Does ESOS apply to my organisation?

ESOS applies if your organisation, or any UK undertakings in your organisations group, qualifies as a large undertaking on the Phase 3 qualification date, 31 December 2022. The criteria below apply to the individual undertakings in your group, so if you report using consolidated accounts you will need to ensure you consider whether any of the individual undertakings is a large undertaking in its own right. You must also take part in ESOS if your undertaking is part of a worldwide corporate group which includes another UK undertaking that meets either of the below conditions.

  • A large undertaking is any UK undertaking that meets either one or both of the conditions below:
  • it employs 250 or more people
  • it has an annual turnover in excess of £44 million and an annual balance sheet total in excess of £38 million

The current compliance period is 6 December 2019 to 5 December 2023, and if your organisation qualifies, you must participate in ESOS and notify compliance to the Environment Agency by the last date of the compliance period, this was 5 December 2023 and has now been extended to 5 June 2024 . If your status changes after the qualification date for a compliance period, this will not affect your eligibility for ESOS. You will still need to comply by the compliance date for the period if you qualified for the scheme on the qualification date of Phase 3 qualification date, 31 December 2022.

We can help you review your compliance obligations and corporate structures to ensure compliance with the applicable schemes.

Do we need to comply with ESOS if we are ISO 50001 certified?

If you have a certified ISO 50001 energy management system that covers all your energy usage, you do not need to do an assessment or use a lead assessor to review your compliance. To be compliant, the certification must remain valid at the compliance date

If you are using ISO 50001 as one of your routes to compliance, then the energy management system must be certified by one of the following:

  • a United Kingdom Accreditation Service (UKAS) accredited certification body
  • a body accredited by another EU member state’s national accreditation body
  • a body accredited by a body which is a member of the International Accreditation Forum

We can review your certification to ensure the organisations scope is compliant and the information being entered in the notification is correct.

You can also consider implementing ISO 50001 as a route to compliance for the future and to demonstrate your ongoing energy management beyond regulatory compliance with ongoing review of improvements and cost savings. Teamwork can support you with this.

What is involved in the process?

To achieve ESOS (Energy Savings Opportunity Scheme) compliance you must carry out an ESOS Assessment. This involves:

  • measuring your total energy consumption
  • identifying areas of significant energy consumption
  • ensuring areas of significant energy consumption are covered by a route to compliance
  • appointing a lead assessor
  • getting one or more board level directors to review the findings of the assessment
  • making a notification of ESOS compliance online
Do we need external verification or assurance?

If you qualify for ESOS and your organisation is fully covered by ISO 50001, you do not need to carry out an ESOS assessment. You do need to notify the Environment Agency that you’re compliant with ESOS.

For an ESOS Assessment you need to appoint a lead assessor to carry out and oversee or review your energy audits and overall ESOS assessment. Lead assessors must be members of an approved professional body register. The report must be signed off by a director.

How should companies report?

All companies qualifying must use the online notification system to notify the Environment Agency that you are ESOS compliant. The Environment Agency collates the notifications from all participants on behalf of all the other regulators.

In your online notification, you will be asked for details about:

  • the participant, contact details for the responsible undertaking, individuals who can be contacted about your ESOS compliance and directors who reviewed the ESOS assessment findings.
  • any aggregation or disaggregation of group members
  • the lead assessor
  • what proportion of your total energy consumption is covered by each compliance route
We practice what we preach

For a consultancy team who routinely manage compliance programs for other organisations, progressing through our own certification process is always a valuable reminder of how the experience feels and we think that this contributes towards our efficient but sympathetic approach to consulting for others.

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