Energy Saving Opportunity Scheme

Further information

ESOS is a new UK scheme which mandates large organisations to save energy and money. It does this by requiring that organisations undertake regular assessments to identify cost-effective energy saving measures on supplies to buildings, industrial processes and transport.

All organisations that are not fully covered by ISO 50001 will need a qualified Lead Energy Assessor to undertake, oversee or sign-off their ESOS assessment. Please see latest list of Chartered Chemical Engineers who are registered ESOS Lead Assessors.

ESOS came into force under the Energy Savings Opportunity Scheme Regulations in July 2014 and applies to all organisations that are on 31 December 2014:

  • engaged in trade or business* and,
  • employ at least 250 persons; or have
  • an annual turnover of above €50 million (approx £42.5 million) and
  • an annual balance sheet above €43 million (approx £36.5 million)


*ESOS does not apply to the public sector or organisations subject to an insolvency procedure.

All qualifying organisations have until 5 December 2015 to confirm compliance using either of the requirement methods detailed in the ESOS compliance audits. Subsequent re-assessment is undertaken every four years.

Please see general information about ESOS compliance requirements and timetable for ESOS Audit submissions.

Alternatively please visit the ESOS website and access the ESOS guidance and ESOS requirements.

If you can't find the information you need you can contact the Environment Agency as the UK scheme administrator at, regardless of whether your business is in England, Scotland, Wales or Northern Ireland.

For all offshore related queries please contact DECC's Offshore Oil & Gas Environment and Decommissioning Team at


My IChemE

IChemE is a registered charity in England & Wales (214379), and a charity registered in Scotland (SC 039661).