ESOS Compliance Services for Phase 4 Reporting

The Energy Savings Opportunity Scheme (ESOS) is a mandatory energy assessment and auditing regulation for large UK organisations. If your business qualifies for Phase 4 of ESOS, now is the time to prepare. Compliance is not only a legal requirement; it’s also a strategic opportunity to reduce costs, optimise energy performance, and enhance your sustainability credentials.

Inteb provides fully managed ESOS Phase 4 compliance services, covering everything from eligibility assessments and site audits to report submission and action plan development.

What Is ESOS?

ESOS is a government scheme requiring large UK organisations to measure and audit their total energy usage every four years. The scheme identifies cost-effective energy-saving opportunities and encourages real action on energy efficiency.

You must comply with ESOS if, on the Phase 4 qualification date, your business:

Employs 250 or more people
Has an annual turnover over £44 million and a balance sheet total of more than £38 million
Belongs to a corporate group that meets these criteria

Phase 4 qualification date: 31 December 2026
Reporting deadline: Expected to be 5 December 2027

While the deadline may seem distant, earlier preparation is key. With increased reporting complexity and enforcement, waiting could lead to rushed audits and missed opportunities.

Person analysing business energy data on a laptop, reviewing charts and graphs relevant to ESOS compliance.

Digital dashboard displaying energy and carbon performance data used for ESOS Phase 3 reporting.

What Must Be Reported in Phase 4?

Organisations must submit a comprehensive ESOS report that includes:

Total energy consumption across buildings, fleets and industrial operations
Identification of significant energy usage areas
Certified audits by an accredited Lead Assessor
Detailed energy-saving recommendations
A mandatory Action Plan (introduced in Phase 4)
Submission to the Environment Agency

Failure to comply may result in civil penalties, reputational damage, and increased scrutiny from regulators.

Inteb takes a proactive and strategic approach to ESOS compliance. Our team includes Environment Agency-approved ESOS Lead Assessors, energy managers and compliance specialists.

Our ESOS services include:

Eligibility checks

Confirming whether your organisation qualifies

Data gathering and analysis

Evaluating usage across assets, transport and facilities

On-site energy audits

Delivered by qualified Lead Assessors

Phase 4 ESOS report preparation

Fully aligned with the latest regulations

Action Plan development

A new Phase 4 requirement

Submission support

Helping you file complete and correct documentation

Post-compliance advisory

Supporting implementation of savings recommendations

What’s New in ESOS Phase 4?

Phase 4 introduces the most significant ESOS updates to date, including:

Mandatory ESOS Action Plans, submitted alongside audit findings
Public disclosure of organisational energy goals and actions
Tighter audit requirements for consistency and integrity
Integration with net-zero and ESG commitments
Closer alignment with SECR and ISO 50001

Inteb ensures your ESOS Phase 4 response meets all new obligations while future-proofing your sustainability reporting framework.

Business professionals reviewing ESOS Phase 3 data on a tablet and printed report during a compliance meeting.

Hands interacting with a digital bar chart interface, highlighting energy performance insights linked to ESOS reporting.

How Inteb Adds Value Beyond Compliance

We go beyond the basics to turn ESOS compliance into a meaningful business advantage. Inteb helps you:

Identify measurable, low-cost efficiency gains
Link findings directly to your carbon, ESG or Net Zero strategy
Improve board-level engagement and internal reporting
Set realistic targets for ISO 50001 or BREEAM
Prepare your business for regulatory convergence and green finance scrutiny

Case Study: ESOS Reporting Unlocks £180K in Energy Savings

Ahead of ESOS Phase 3, an international Experience Technology company with UK operations engaged Inteb to support compliance and cost reduction. Our energy management specialists conducted detailed site audits and data analysis, identifying inefficient HVAC systems and poorly controlled lighting. Based on our findings, the client submitted a fully compliant ESOS report and launched a phased upgrade programme. The improvements are projected to deliver £180K in energy savings, with full capital recovery expected within 1–3 years. Beyond compliance, the upgrades improved indoor environmental quality and long-term energy performance. This case demonstrates how ESOS reporting can go beyond regulation—delivering real value through strategic insight, targeted investment, and energy-saving action.

Mechanical and electrical plant room with energy systems — typical of those reviewed under ESOS compliance services for Phase 4 reporting.

Person reviewing printed bar charts and energy usage data during ESOS compliance preparation.

Frequently Asked Questions

Q: What happens if we miss the Phase 4 deadline?
You may be subject to fines up to £50,000 and daily charges for ongoing non-compliance. Missing deadlines can also impact your ESG ratings and funding eligibility.

Q: Does ISO 50001 replace the need for an ESOS audit?
Yes, if your certified ISO 50001 system covers 100% of your energy consumption, you are exempt from ESOS audit requirements — but you must still notify the Environment Agency.

Q: When should we start preparing for Phase 4?
Now. The complexity and scope of Phase 4 mean starting early is the safest and most cost-effective strategy.

Why Choose Inteb?

Environment Agency-approved ESOS Lead Assessors

Seamless, end-to-end delivery model

Experience across complex, multi-site portfolios

Transparent, fixed-fee service structure

Practical insight that links compliance to strategy

Ready to Start Your Phase 3 Compliance?

The Phase 4 deadline may be in 2027, but the time to act is now. Contact Inteb today to start your compliance planning and unlock the full benefits of ESOS.

Book your ESOS consultation today – we’ll guide you through the process, from data to delivery

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