Energy Saving Opportunity Scheme

Energy Saving Opportunity Scheme

IChemE was appointed by the UK Environment Agency in October 2014 to train Chemical Engineers to the Energy Saving Opportunity Scheme (ESOS) Lead Energy Assessor (LEA) standard. Please view details of how to become an ESOS Lead Energy Assessor, the benefits, and ESOS Lead Energy Assessor training events.

ESOS is a new UK scheme that 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 Energy Assessors.

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

  • 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.

Phase 2 of the ESOS regulation is now underway and all qualifying organisations are able to begin the compliance process again, with assessments needed to be complete by 5 December 2019. Subsequent re-assessment is undertaken every four years.

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