For large organisations in the UK, the Energy Savings Opportunity Scheme (ESOS) is a mandatory energy assessment scheme.
Introduced by the ESOS Regulations 2014 Act and updated in 2022, the scheme requires qualifying organisations to assess their total energy use across buildings, transport, and industrial processes to identify opportunities for greater efficiency and cost savings.
Organisations that meet one or more of the following criteria must comply with ESOS:
Failure to meet ESOS requirements can lead to significant fines and reputational damage.
Our team of ESOS compliance experts support organisations in the planning, conducting and reporting on energy assessments. Our specialists are registered ESOS Lead Assessors, providing comprehensive energy assessments that can support your business to meet ESOS requirements and identify opportunities for energy and cost savings. We support a number of organisations that require ongoing support through the review and update of their ESOS Action Plan and energy savings.
Our registered ESOS Lead Assessors provide independent ESOS advice to in-house teams to help prepare and assess their energy use through to fully outsourced ESOS Assessments and sign-off.
If you plan to complete your ESOS assessment in-house (low energy users), our registered Lead Assessors can provide tailored, practical guidance to help you prepare and deliver a compliant assessment and report.
Our ESOS Advice Service includes:
This service is offered at a fixed cost, with no hidden extras. We also provide a free, no-obligation quotation and initial discussion to help determine your needs.
If your organisation lacks the resources or expertise to manage ESOS internally, our Outsourced ESOS Lead Assessor Service provides a complete solution.
Our consultants manage the entire process, including:
This service ensures your organisation meets ESOS requirements efficiently and on time, delivered at a fixed, transparent cost.
Organisations with ISO 50001 certification and an energy management system that covers 100% of your energy usage valid by the compliance deadline are exempt from ESOS assessment requirements. For some types of business, where significant reductions in energy costs are achievable, or where an ISO 14001 environmental management system is already in place, implementing a formal energy management system is a cost-effective route for ESOS compliance.
Our experienced ISO consultants can help you design and implement an energy management system that will deliver tangible business benefits and achieve ISO 50001 certification.
We offer fixed-price ISO consultation and implementation, with no hidden extras and guaranteed ISO certification.
Our professional ESOS compliance services provide peace of mind and ensure your organisation can meet ESOS requirements with our qualified and registered ESOS Assessors.
The UK Government has yet to ratify and confirm the legal changes for ESOS Phase 4. The information below is based on the latest published updates at the time of writing.
The UK Government has strengthened ESOS requirements for Phase 4 to align with its Net Zero 2050 commitments.
Organisations must now include:
Summary of the steps required to complete an ESOS assessment:
The Energy Savings Opportunity Scheme (ESOS) was introduced by the ESOS Regulations 2014. It is a mandatory energy assessment scheme that requires qualifying organisations to audit their energy use across premises, transport and industrial processes. The audit should identify energy usage and areas where more efficient usage can be implemented.
UK organisations responsible for regulating the ESOS scheme include the Environment Agency, Natural Resources Wales, the Northern Ireland Environment Agency, the Scottish Environment Protection Agency and the Secretary of State for Business, Energy and Industrial Strategy.
It is a legal requirement for qualifying organisations to conduct an ESOS assessment every four years.
ESOS compliance can help identify energy savings, leading to lower energy costs, less energy wastage and more effective operations, transport and industrial processes. Energy-efficient organisations can benefit from improved staff engagement and enhanced reputation.
Organisations known as ‘large undertakings’ qualify for ESOS assessments.
A large undertaking is defined as employing more than 250 people or having an annual turnover in excess of £44m and an annual balance sheet total in excess of £38m.
ESOS assessments should be carried out every four years, known as ESOS ‘phases’.
The next phase, Phase 4, is expected to have a compliance deadline of December 2027.
It is strongly advised to begin data collection, auditing, and compliance preparation early in the cycle to avoid last-minute risks.
A Lead Assessor must be appointed by law to oversee and sign off an ESOS assessment. All Lead Assessors must be a member of an approved professional body register. Our team of ESOS Lead Assessors are all registered.
Organisations with ISO 50001 certification do not need to carry out an ESOS assessment (subject to meeting the ESOS ISO 50,001criteria). The organisation will need to notify the Environment Agency of its ISO 50001 status and confirm compliance with ESOS. Our team can support the implementation of the ISO 50001 standard and building an energy management system.
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