Professional registrations

ESOS Lead Energy Assessor

The UK’s Department of Energy and Climate Change introduced a new regulation in 2014: the Energy Savings Opportunity Scheme (ESOS). This regulation required all large enterprises to carry out an ESOS compliant energy assessment by 5 December 2015, with subsequent re-assessments every four years - the next is required by 5 December 2019. These audits can only be conducted by an approved ESOS Lead Energy Assessor.

Companies must comply with ESOS if they are a large undertaking, which is:

  • any UK company that either:
      • employs 250 or more people, or
      • has an annual turnover in excess of 50 million euro (£44,845,000), and an annual balance sheet total in excess of 43 million euro (£38,566,700)*
  • an overseas company with a UK registered establishment which has 250 or more UK employees (paying income tax in the UK).

*figures correct as of 31.10.19 as per 

Eligibility requirements

ESOS LEA registration is open to:

  • existing Chartered Members and Fellows of IChemE
  • those with experience in carrying out energy management and energy auditing activities (typically no less than five years).

How to register

To qualify as a Lead Energy Assessor and be put on the register you will need to:

  1. attend an ESOS LEA one-day training course
  2. complete an assessment (within seven days of attending the course).

Once qualified you’ll need to keep-up-date with CPD and revalidate your registration each year to remain on the register. For more information visit our CPD pages.

Additional information