What is ESOS?

In 2012, Article 8 of The EU Energy Efficiency Directive (“The Directive”) (2012/27/EU) stated that ‘large enterprises’ would be required to complete mandatory, energy audits once every four years. The UK’s version of this legislation is The Energy Saving Opportunity Scheme (ESOS).

The Energy Saving Opportunity Scheme (ESOS) requires you to have completed an energy audit across your organisation’s buildings, processes and transportation fleets by the 5th December 2019.

Qualification Criteria – Are you deemed to be a Large Enterprise

For the purposes of this policy your organisation will fall within the scope if it meets either of the following criteria;

1. Has 250 or more employees within the UK.
2. Has fewer than 250 employees, but has;
      a. An annual turnover exceeding €50 million
      b. and a balance sheet exceeding €43 million

Public Bodies are excluded


ESOS has targeted nearly one third of the British energy demand, and BEIS (Department for Business, Energy & Industrial Strategy - formerly DECC) has estimated that the scheme will produce a £1.6bn net benefit.

Enterprises involved will be given the opportunity to reduce energy waste and identify cost effective savings. A reduction in energy bills translates to financial savings that can be reinvested across different business sectors to increase profitability.

Fully costed savings will be identified through audits. Energy audits are a great way to highlight where your buildings can operate more efficiently and subsequently, where your overheads can be reduced.

Whilst some may consider audits a burden, they are extremely useful for benchmarking, not only against your future performance but against other buildings within your group and best practice guidelines.

In addition to the financial benefits, participating in ESOS gives businesses the opportunity to demonstrate their commitment to reducing their Carbon Footprint, an increasingly important consideration considering the intense public scrutiny of business’ environmental impact

How We Can Help

Apollo Energy offer the services required to ensure that your organisation is fully compliant, and are able to provide support that will allow you to make the most of the opportunities identified:

  • Compile 12 months data for the Reference Period
  • Advise on Lead Assessor Selection
  • Agree on methodology & timetable
  • Define audit scope
  • Provide the Energy Consumption Profile
  • Advise on sampling approach
  • Advise on how best to implement savings suggested


Civil penalties can be enforced against qualifying organisations that fail to comply by 5th December 2019:

  • A £50,000 penalty
  • £500 fine for every subsequent day of non-compliance (maximum 80 days)

ESOS Brief