Delivering certified ESOS energy audit solutions for organisations across the UK. Work alongside an approved ESOS lead assessor to measure total energy consumption, ensure full ESOS compliance, and reduce energy costs across energy and carbon management operations.
The Energy Savings Opportunities Scheme (ESOS) is a mandatory energy assessment scheme for organisations in the UK that meet large undertaking thresholds. At Elemental Consulting Group, our qualified ESOS lead assessors help businesses complete an ESOS assessment, manage your ESOS reporting system, and identify cost-effective energy saving opportunities across your organisation’s energy infrastructure.
An organisation qualifies for ESOS phase 4 if on the qualification snapshot date of 31 December 2026 (following 31 December 2022 for phase 3) it employs 250 or more people, or has an annual balance sheet total in excess of £38 million (total in excess of £38 million) and turnover exceeding £44m. Organisations that qualify for ESOS must complete an energy assessment scheme for large UK undertakings covering total energy consumption.
Following the removal of display energy certificates (DECs) and Green Deal Assessments under statutory ESOS regulation and phase 4 guidance, organisations must follow an approved compliance route: a comprehensive ESOS energy audit led by a certified ESOS lead assessor or ISO 50001 certification.
Phase 4 compliance introduces mandatory ESOS action plan reporting. Participants must review ESOS phase 3 recommendations, document energy saving measures implemented during the compliance period, and align with streamlined energy and carbon reporting (SECR) standards to drive energy efficiency.
See how our qualified lead assessors streamline total energy consumption data collection and compliance filing for multi-site estates.
We provide certified ESOS lead assessors listed on approved registers for ESOS lead assessors. Our qualified ESOS lead team ensures your energy assessment and energy saving scheme meets all ESOS requirements set by the scheme administrator and Environment Agency.
Your ESOS audit report must be signed by a qualified ESOS lead assessor. Our lead team verifies 95% energy usage and ensures complete submission.
We calculate total energy consumption across buildings, industrial processes, and transport logistics to measure energy intensity metrics.
Our energy auditors evaluate building heating, lighting, HVAC, and fleet transport to uncover practical cost-effective energy saving opportunities.
To meet the 5 December 2027 deadline, qualifying organisations must notify the Environment Agency via the official MESOS portal.
We evaluate energy used by commercial vehicle fleets, grey fleet mileage, and building efficiency to support net zero transition plans.
We align with streamlined energy reporting mandates, ensuring your ESOS audit data integrates seamlessly with SECR annual director disclosures.
Gain real-time insights into energy consumption and cost control with real time sub-metering and cloud estate dashboards.
Providing clean energy solutions and energy storage for businesses across all sectors to maximize self-generated power.
| Delivery Stage | Key Activities | |
|---|---|---|
| Energy Data Intelligence | We analyse your energy consumption data to establish a clear and reliable performance baseline, construct your total energy consumption report for profiling and audit methodology development. | |
| Site & Systems Assessment | After agreeing on the audit methodology, we conduct detailed on-site evaluations of buildings, systems, and operational processes to identify how energy is being used. If required, this also extends to transport. | |
| Opportunity Identification | We highlight and prioritise practical, cost-effective opportunities to improve efficiency, reduce carbon, and optimise performance. | |
| Executive Reporting & Insight | We provide clear, concise reporting designed for board-level decision making, supporting confident action and strategic sign-off. | |
| Compliance Delivery & Management | We manage the full ESOS process, ensuring all requirements are met, including audit reporting and submission to the Environment Agency via the MESOS portal. | |
Our compliance reports are reviewed and approved by our in-house CIBSE-Accredited ESOS Lead Assessors, ensuring the highest levels of technical competence, professionalism, and compliance. Working in accordance with recognised industry standards, including ISO 50002 and BS EN 16247, our team brings the expertise required to deliver robust, defensible audits that meet regulatory expectations.
This accreditation provides clients with complete confidence that all audit outputs are independently credible, methodologically sound, and aligned with best practice. By combining CIBSE-approved expertise with a commercial, data-driven approach, we ensure every assessment not only satisfies compliance requirements but also delivers clear, actionable insights to support long-term energy efficiency and sustainability goals.
Elemental Consulting Group has successfully guided businesses through phase 2, the introduction of phase 3 legislation and guidance, and ongoing phase 4 compliance (with certain phase 4 proposals postponed until phase 5).
Experienced energy consultants and accredited ESOS lead assessors dedicated to your compliance success.
Managing Director & Senior Energy Specialist
Compliance & Energy Project Coordinator
Senior Energy Engineer & Lead Auditor
Stay informed with expert guidance on statutory ESOS regulations, energy data profiling, and lead assessor audits.
Comprehensive breakdown of mandatory ESOS Phase 4 qualification rules, Action Plan submission requirements, and Environment Agency penalty risks.
READ FULL GUIDE →
Technical guide on establishing 95% total energy consumption baselines across buildings, industrial processes, and transport fleets.
READ FULL GUIDE →
Essential guide for UK large undertakings to determine qualification thresholds, CIBSE lead assessor roles, and statutory reporting.
READ FULL GUIDE →Answers to regulatory compliance, qualification thresholds, and lead assessor requirements.
The Energy Savings Opportunity Scheme (ESOS) is a mandatory energy assessment scheme for organisations in the UK that meet large undertaking criteria. Managed by the Environment Agency as scheme administrator, ESOS applies to UK enterprises that employ 250+ people or exceed £44m turnover and £38m balance sheet total.
The qualification snapshot date for ESOS phase 4 is 31 December 2026, and the final notification of compliance deadline is 5 December 2027 (following 5 December 2026 preliminary reporting milestones). Qualifying businesses must complete an ESOS assessment covering 95% of total energy consumption by this date.
Following the removal of display energy certificates (DECs) and Green Deal Assessments under phase 4 guidance, organisations must undertake a formal ESOS energy audit led by an approved ESOS lead assessor or maintain ISO 50001 certification to meet the route to compliance.
The ESOS compliance report must be signed by a certified ESOS lead assessor listed on approved registers for ESOS lead assessors (such as CIBSE), alongside a named company director, before you submit a compliance notification to notify the Environment Agency.
Failure to complete an ESOS assessment or notify the Environment Agency by 5 December 2027 can result in financial penalties up to £90,000, plus daily fines for continued non-compliance. Early engagement with a qualified ESOS lead assessor ensures your organisation meets all ESOS requirements prior to phase 5 updates.
Click below to launch our interactive multi-step ESOS questionnaire and connect directly with an accredited CIBSE ESOS lead assessor.