ESOS Consultants & Lead Assessors
The Energy Savings Opportunity Scheme (ESOS) is a mandatory energy assessment programme for large UK organisations. At ENCOM Energy Compliance Consultancy Limited, we support businesses through every stage of ESOS compliance – from audits and data analysis to reporting and practical recommendations – helping you meet regulatory obligations while unlocking real energy and cost-saving opportunities.
What is ESOS?
ESOS is a UK Government scheme established under the EU Energy Efficiency Directive and retained post-Brexit. It requires qualifying organisations to carry out energy audits every four years to identify cost-effective measures that improve energy efficiency and reduce carbon emissions.
The scheme covers energy used in buildings, industrial processes, and transport, ensuring that businesses have a comprehensive understanding of their energy consumption and potential savings. While ESOS does not oblige companies to implement recommendations, it does require them to identify opportunities and document their energy-saving potential.
Legal Requirements
ESOS applies to large undertakings and their corporate groups in the UK that meet at least one of the following criteria:
More than 250 employees, or
An annual turnover exceeding £44 million and an annual balance sheet total exceeding £38 million.
Qualifying organisations must report:
Measure total energy consumption across buildings, processes, and transport.
Conduct energy audits to identify efficiency opportunities.
Have the compliance report reviewed and signed off by a qualified Lead Assessor.
Submit the ESOS report to the Environment Agency (or relevant regulator) by the compliance deadline.
ESOS operates in phases every four years, with penalties for late or non-compliance.
Compliance Periods
| Qualification Date | Compliance Period | Compliance Date | |
|---|---|---|---|
| 1 | 31 December 2014 | From 17 July 2014 to 5 December 2015 | 5 December 2015 |
| 2 | 31 December 2018 | From 6 December 2015 to 5 December 2019 | 5 December 2019 |
| 3 | 31 December 2022 | From 6 December 2019 to 5 December 2023 | 5 June 2024 |
| 4 | 31 December 2026 | From 6 December 2023 to 5 December 2027 | 5 December 2027 |
What Our ESOS offers?
Comprehensive energy audits across buildings, processes, and transport fleets.
Data collection, benchmarking, and analysis to map your energy use.
Identification of cost-effective energy-saving measures, including payback periods and carbon reduction potential.
Preparation of a fully compliant ESOS evidence pack and submission to the relevant authority.
Support with implementing recommendations, from low-cost behavioural changes to investment-grade energy projects.
Alignment of ESOS findings with wider Net Zero, SECR, and sustainability strategies.
Why Choose ENCOM?
Our ESOS Lead Assessors are accredited with CIBSE (Chartered Institution of Building Services Engineers), and all energy audits are undertaken by CIBSE-accredited Low Carbon Consultants, ensuring the highest technical quality and professional standards.
ENCOM has been delivering ESOS services since Phase 1 of the legislation and has since supported compliance for more than 60 large undertakings, completing over 300 ESOS energy audits across all three phases.
We are proud to hold an exceptional 100% record of “compliance without remedial actions” when our work has been audited by the Environment Agency – a level of assurance that is rare within the ESOS framework.
Our role extends beyond simply meeting deadlines. We guide clients through the entire process, from data collection and audit preparation to report submission, while also providing active support during Environment Agency audits if required.
In several cases, we have helped clients achieve compliance within very short timeframes, and through our proactive approach and direct communication with the Environment Agency, we have successfully assisted several organisations in having penalty notices revoked.
Contact Us
ENCOM Energy Compliance
Consultancy Limited
1 Priestley Drive, Tattenhoe Park
Milton Keynes, MK4 4NW