Coles Knapp can offer Lead Assessor Services for ESOS

Contact us on 0330 024 1755 or by clicking here for a free quotation.

What is ESOS?

ESOS (Energy Savings Opportunity Scheme) is an energy assessment scheme that is mandatory for large organisations in the UK with more than 250 employees, turnover in excess of €50m and an annual balance sheet total of €43m, or companies within a group with a company of this size.

An ESOS Assessment requires participants to do three things:

1. Measure total energy consumption

Measure total energy consumption across buildings, transport and industrial activities.

2. Conduct energy audits to identify cost-effective energy efficiency recommendations.

Ensure that at least 90% of your total energy consumption is subject to an ESOS compliant energy audit, a Display Energy Certificate, a Green Deal Assessment or a certified ISO 50001 Energy Management System during each phase of the scheme. For the first phase of the scheme, any energy auditing activity dating back to December 2011 may be used to support compliance provided that it meets the minimum standards required of ESOS Energy Audits.

3. Report compliance to the Environment Agency

By 5 December 2015, participants must notify the Environment Agency (as the scheme administrator) of compliance with the scheme. The Assessment must have been reviewed by a Board-level Director and approved by a Lead Assessor. Participants are not required to implement energy efficiency recommendations identified by their ESOS Assessments. However, they will only achieve the financial benefits that arise from avoiding energy waste if they do implement cost-effective recommendations identified.

More detailed guidance is available in the summary document on the UK Government website


ESOS will operate 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 first phase is 31 December 2014.

Coles Knapp are registered as Lead Assessors with Elmhurst Energy and can assist you in your ESOS compliance.