Energy Savings Opportunity Scheme (ESOS)

ESOS Phase 4 is the current four-year compliance period for the UK’s Mandatory Energy Savings Opportunity Scheme, running from 6th December 2023 to 5th December 2027. Qualifying UK organisations must assess their energy use, identify cost-effective energy-saving opportunities and submit a compliance notification by 5th December 2027.

Your organisation must comply with ESOS if it qualifies as a large undertaking on the qualification date. This means 250 or more employees, and/or meeting both the financial thresholds set out by the scheme. Even if your individual entity doesn’t meet these thresholds, you may still be in scope if you are part of a larger corporate group or another entity within the group qualifies.

McGrady Clarke provides end-to-end ESOS Phase 4 consultancy, combining approved ESOS Lead Assessors with experienced project management to minimise internal workload. We focus on practical recommendations that help organisations achieve compliance while identifying opportunities to reduce energy costs, lower carbon emissions and support long-term sustainability goals.

We support qualifying organisations across a wide range of sectors, including manufacturing, logistics, healthcare, commercial property, retail and other multi-site organisations. Our experience enables us to manage complex compliance programmes while tailoring recommendations to each organisation’s operations.

An approved ESOS Lead Assessor oversees the compliance process, reviews energy assessments, ensures the audit meets regulatory requirements and signs off the final ESOS report before submission.

The ESOS Phase 4 compliance deadline is 5th December 2027. Organisations that qualified on 31st December 2026 should begin planning well in advance to allow sufficient time for data collection, site assessments and reporting.