Energy Savings Opportunities Scheme (ESOS)

The ESOS regulations apply to any large undertaking or enterprise that carries out a trade or a business, which includes any corporate group where one or more members of the UK group meets the ESOS definition of a large undertaking. An organisation is considered a large undertaking if it:

  • Employs 250 or more people


  • Employs fewer than 250 people, but has an annual turnover in excess of €50 million and an annual balance sheet in excess of €43 million


  • Is a part of a group that includes at least one entity that meets either of the criteria above.


These are the basic qualification requirements. However, you may still fall under the scheme if you are part of a corporate group where one member qualifies. Please contact Eneco Consulting and our Accredited Lead Assessors can ensure you meet your ESOS obligations.

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ESOS Compliance Dates

ESOS operates in four-yearly compliance phases. Organisations in the UK must assess whether or not they are required to participate in ESOS on the qualification date of each phase. The qualification date for the Phase 3 is 31st December 2022.

The last day of each compliance phase (‘the compliance date’) is the date by which the Participant must have undertaken its ESOS Assessment and notified its compliance to the Environment Agency.

Qualification Date: Four-Year Compliance Phase: Compliance Date:
31st December 2022 6th December 2019 – 5th December 2023 5th December 2023
31st December 2026 6th December 2013 – 5th December 2027 5th December 2027
31st December 2030 6th December 2017 – 5th December 2031 5th December 2031