Participants in ESOS must have a Lead Assessor to undertake various roles in relation to their ESOS Assessment.  The exception to this is where a participant has an ISO50001 certified Energy Management System on the compliance date.

Your appointed Lead Assessor will have to undertake, oversee or review your ESOS Energy Audits and/or any other auditing activities, such as Display Energy Certificate assessments or GreenDeal Assessments (see Section 6.4 of guidance).

Your Lead Assessor will also have to sign-off your overall ESOS Assessment once complete, to confirm it meets the requirements of ESOS overall.

You will need to submit the details of this Lead Assessor to the Environment Agency when reporting your compliance.

You may wish to have an ESOS Assessor to help oversee other parts of the ESOS Assessment process, such as overseeing the measurement of your total energy consumption, identifying areas of significant energy consumption and conducting ESOS Energy Audits.

Lead Assessors must belong to a register of energy professionals approved by the Environment Agency.

Selecting an appropriate Lead Assessor:

In selecting an appropriate Lead Assessor from an approved register, you should consider what other qualifications and/or experience that individual holds and how these might best benefit you in getting the best results from your audit(s). You may wish to consider your prospective auditors:

• sector-specific experience;

• familiarity with industry specific technologies and processes; and

• accreditation/certification to audit against prescribed standards (ISO standards) or other UK schemes (DEC assessor or Green Deal Advisor).