Are you Prepared for ESOS?


Assessing Opportunities For Energy Savings

The Energy Savings Opportunity Scheme (ESOS), requires ‘large undertakings’ in the UK to assess the energy use and potential for energy reduction of their organisation. It is UK government’s interpretation of article 8 of the EU Energy Efficiency Directive (EED) which requires energy audits and energy management systems to be put in place for large organisations. The Environment Agency (EA) will be the administrator of the scheme and all included organisations must notify the EA on a regular basis that they are compliant with ESOS. Furthermore, organisations will be required to carry out ESOS assessments every 4 years.



  • Determine inclusion in the scheme by 31 December 2014
  • ESOS assessments must be carried out across the organisation in each 4 year compliance period
  • First 4 year compliance phase December 2011-2015
  • 5 December 2015 is deadline for being ESOS compliant and reporting to the EA
  • EA will publish information about the process and system for ESOS compliance at the end of 2014



‘Large undertakings’. These are defined as organisations that;

  • Either employ more than 250 people
  • Or have an annual turnover in excess of 50 million euros and balance sheet assets exceeding 43million euros



Audits of the energy used by buildings, industrial processes and transport for UK operations must be carried out to identify cost effective energy saving measures. Energy used by assets held or activities carried out by organisation captured by the scheme must be included in the audits. ESOS compliant energy audits must include 12 months of verifiable data that has:

  • Been collected over a continuous period
  • Begun collection no earlier than 6 December 2010 for the first compliance period
  • Begun no more than 24 months before the start of the energy audit
  • Not been used as the basis for an energy audit in a previous compliance period The organisation will be required to appoint a lead assessor to carry out and review the energy audits and oversee the ESOS assessment



  • Energy consumption and energy efficiency must be analysed using energy profiling – breaking down the different ways energy is used to identify inefficiencies
  • Energy savings should be assessed based on calculating the cost of implementing and running a reduction measure against the energy reductions or energy spend achieved
  • There is no regulatory requirement for participants to implement the identified savings



  • If your organisation has an ISO 50001 certification you are already compliant with ESOS
  • If your organisation is not fully covered by ISO 50001 you will need to carry out ESOS assessments.
  • DECs and other ESOS compliant energy assessments (past or future) will also allow compliance. The details of these other schemes are to be published at a later date


START YOUR ESOS COMPLIANCE WITH ENERGY PERSPECTIVE. We will gladly guide you through the process of audit and work with you to realise savings identified within the process.