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Energy Savings Opportunity Scheme (ESOS)

The date of December 14th 2014 marked the qualification date for the Government’s new mandatory Energy Savings Opportunity Scheme (ESOS). The scheme introduced the need for compulsory energy audits for all large enterprises, to encourage the uptake of cost effective energy efficiency measures.  However If you have ISO 50001 certification you will be considered to have met the obligations of the ESOS scheme.

ESOS Fact Sheets

ESOS Energy Compliance Services Energy Savings Opportunity Scheme (ESOS)ISO50001






All organisations must have complied with the legislation by 5th December 2015 if they are defined as a large enterprise.

  • If you have 250+ employees
  • If the organisations turnover is £42.5m+
  • Or you have a balance sheet of £36.5m+

The scope of the scheme includes energy use in buildings, transport and industrial processes. Under the proposed scheme, businesses will be required by law to engage at least every four years in performing:

  • A measurement of energy use
  • An on-site energy audit
  • Identification of cost effective energy efficiency recommendations
  • Report compliance to the Environmental Agency

There are multiple roots to compliance available to participants of the scheme:

  • Commissioning ESOS energy audits through approved ESOS assessors
  • Through ISO 50001 certification
  • Through Display Energy Certificates (DECs) and accompanying recommendation reports
  • Through Green Deal Assessments

To ensure your organisation is accurately informed and is legally compliant with the new legislation, we would encourage you to engage with us in an initial consultation. Through our understanding of the scheme and experience of energy auditing to the standard required, we are positioned to guide your business through the most straightforward route to compliance with the legislation.

If you would like further information on the scheme please contact us and or team will be happy to advise on how best to prepare and assist with simplifying compliance in 2015.

ESOS Compliance Services

The Energy Savings Opportunity Scheme (ESOS), set up by the Department of Energy and Climate Change (DECC), mandates large organisations to conduct audits of their energy use.

Qualifying organisations are required to measure the energy consumed in their buildings, transport and industrial processes, carry out energy audits and report their compliance. Compliance can be achieved by either implementing an ISO 50001 energy management system covering all energy use, or by appointing a Lead Assessor to carry out audits and/or review a variety of compliance routes. We provide a range of ESOS services, from guidance and oversight, to complete compliance support and ISO 50001 implementation. The deadline for compliance is 5 December 2015; penalties of up to £50,000 are applicable for noncompliance.

How do you comply with the scheme?

To comply with ESOS, you must:
1.    Measure the energy you consume in buildings, transport and industrial processes
2.    Audit areas of significant energy consumption through one of the methods in the table below

Most organisations will need to appoint a Lead Assessor, who is an energy professional listed on a register approved by the Environment Agency. The Lead Assessor can either carry out the audits of the participant’s energy use themselves, or review and sign off audits carried out by others. There are several routes that can be combined to cover all significant energy use, these are listed below. At least 90% of the total energy use must be audited.

ESOS Compliance Services Choice

We are able to support your ESOS compliance at whatever level is appropriate, whether that be reviewing existing audits to ensure compliance, or carrying out audits and acting as the Lead Assessor. Depending on your outlook we can provide either the fastest, most cost efficient route to compliance or use ESOS as an opportunity to provide strong business cases for implementing energy conservation measures and realising energy and carbon savings.

We have experienced and certified energy professionals and experience in all energy and carbon compliance areas, from the Carbon Reduction Commitment Energy Efficiency Scheme to ISO 50001.

ESOS Update October 2014

The Environment Agency announced on Friday 17th October the list of organisations which can run energy audits for businesses under the new mandatory ESOS scheme.  The Environment Agency confirmed that members of the Energy Institute’s Register of Professional Energy Consultants and the Energy Institute’s Chartered Energy Managers are eligible to conduct ESOS audits. It is estimated that up to 10,000 businesses in the UK have to get an energy audit under the new ESOS Scheme.

Companies have up to 31st December 2015 to get an approved audit or face fines of up to £90,000.

Which organisation members are qualified ESOS lead assessors, whom have the ability to sign off energy audits carried out under the Energy Savings Opportunity Scheme (ESOS).

  • Association of Energy Engineers – Certified Energy Auditor-International (CEA-I)
  • Association of Energy Engineers – Certified Energy Manager International (CEM-I)
  • Elmhurst Energy Systems – Elmhurst Approved ESOS Lead Assessor
  • Energy Institute (EI) – Chartered Energy Manager
  • Energy Institute (EI) – Register of Professional Energy Consultants (RPEC)
  • Institution of Chemical Engineers – Register of Chartered Chemical Engineers (MIChemE/FIChemE) ESOS LEA
  • Inteb – Inteb ESOS Register
  • Quidos – ESOS Register.com
  • Stroma Certification Ltd – ESOS Lead Energy Assessor Certification
  • The Chartered Institution of Building Services Engineers (CIBSE) – The CIBSE Low Carbon Consultant (LCC) Register, ESOS Lead Assessor Subset
  • The Energy Managers Association – EMA Energy Saving Opportunity Scheme Lead Assessor Register
  • The Institute of Environmental Management and Assessment – Environmental Auditor & Full membership of IEMA (ESOS Lead Assessor Subset)
  • The Institute of Environmental Management and Assessment – Principal Environmental Auditor (ESOS Lead Assessor Subset)

ESOS Lead Assessor

A Lead Assessor can be an external energy consultant or an in-house staff member, but they must be affiliated with one of the bodies listed above to the specified level.

ESOS requires organisations to have a Lead Assessor verify any audits undertaken as part of ESOS, except when a participant has a company wide certification to ISO50001 (Energy Management System Certification) that meets the ESOS criteria.

For details of our ESOS Lead Assessor service please contact us.

ISO 50001 Certification


ISO 50001 is the world’s leading international standard outlining best practice energy management to achieve energy efficiency. It provides a structure to measure, monitor and audit energy usage.

We provide third party certification to prove that your business is managing energy use effectively; that you’re reducing your greenhouse gas emissions; and you’re working to meet environmental targets.

Some companies will decide to implement the standard solely for the process and operating benefits it provides.

Others companies decide to get certified to demonstrate to the supply chain and external parties that they have implemented an energy management system.

Life After ESOS - From Report to Implementation

Catalyst can take your ESOS recommendations off the pages of the submission and make them into implemented realties. Combining expert survey and specification, and with access to established sources of funding where needed, we can provide savings based, transparent and simple routes to making ESOS work.

ESOS – Typical Recommendations Include:

  • Lighting: With double-digit % annual savings possible, Catalyst can survey and complete quotations for full, partial or rolling programmes of upgrade.
  • Building Energy Management Systems: Take control of energy costs.
  • Consumption Reporting: Measure, manage and reduce your costs by understanding what you’re using, when, where and what it’s costing.
  • Power Factor Correction and Voltage Optimisation: Eliminate the costs on the bill that you don’t have to be paying.
  • Strategy: Catalyst can join practice to process to implement a rolling programme of efficiency and cost reduction
  • Heat Recovery: Working off detailed thermal surveys, Catalyst can formulate a recovery strategy to recover and re use this valuable commodity

ESOS – Funding Implementation within Savings

Catalyst recognises that organisations want to review the reality of the costs of implementing ESOS and have established routes to finance to cover this need. Following survey and specification, Catalyst can arrange for finance quotations to be included as a key part of project planning. On many occasions, it will be possible to fund schemes entirely inside their own savings.

Case Study – Current Catalyst ESOS Client: Automotive Manufacture

Our initial desktop analyst and subsequent survey identified an annual spend of £450k and potential savings of 23%, with immediate measures included;

  • Metering and monitoring
  • BMS optimisation
  • LED Lighting feasibility and funding
  • Solar power feasibility and funding
  • Gas CHP plant feasibility and funding

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