Air Quality
If You Haven’t Complied with ESOS Phase 3 Yet: What Your Business Should Do Now
7th April 2026
Regulators are taking a firmer stance, and the introduction of Action Plans and annual reporting means non‑compliance is more visible than ever.
Here’s the guidance we’d give to any organisation still outstanding.
Engage with the Environment Agency Immediately
Silence is the worst option. The Environment Agency (EA) is far more constructive when organisations:
- Acknowledge the delay
- Explain the reasons
- Explain that a Lead Assessor will be appointed shortly
- Provide a realistic timeline for submission
Proactive communication can significantly reduce the speed of enforcement action – and anecdotally, proactive compliance once an enforcement has been issued can be seen favourably, and has resulted in reduced penalties.
Complete Your ESOS Assessment as Soon as Possible
Even though the deadline has passed, the requirement hasn’t disappeared. The business still needs to:
- Appoint a qualified ESOS Lead Assessor
- Gather and validate 12 months of energy data
- Conduct the required audits
- Produce the ESOS report and evidence pack
- Complete your Action Plan
The EA expects late submissions to be completed “without undue delay”.
Prepare for Potential Enforcement — But Don’t Panic
The EA has several enforcement tools, including:
- Civil penalties for failure to notify or comply
- Publication of non‑compliance (naming and shaming)
- Compliance notices requiring corrective action
However, penalties are not automatic. Demonstrating active progress and cooperation has the potential to influence outcomes.
Start Developing Your ESOS Action Plan in Parallel
Late submitters must still produce an Action Plan as soon as possible.
That means:
- You don’t gain extra time by submitting late
- Your Action Plan timeline is already compressed
- You may need to accelerate prioritisation and governance work
Starting the Action Plan early helps avoid a second compliance issue.
A Catalyst to Strengthen Energy Governance
Identify the Root Cause of the Delay
This is essential — not for blame, but for resilience. Common issues include:
- Fragmented or poor‑quality energy data
- Lack of internal ownership
- Insufficient resource or budget
- Confusion around regulatory requirements
- Over‑reliance on external partners who were engaged too late
Understanding the cause helps prevent the same problem in Phase 4.
Use This as a Catalyst to Strengthen Energy Governance
Late compliance is often a symptom of deeper structural issues. This is an opportunity to:
- Establish clear internal accountability
- Improve energy data systems
- Integrate ESOS with net‑zero strategy
- Build a more proactive compliance culture
ESOS is moving toward more frequent and more transparent reporting — businesses that treat it as a strategic process rather than a deadline scramble will be better positioned.
How Arthian Can Support Late Submitters
Arthian can help organisations get back on track quickly and credibly by:
- Rapid mobilisation: we can deploy assessors and analysts quickly to accelerate data gathering and audit completion.
- Regulator‑ready communication: we help draft clear, constructive correspondence with the EA to communicate that a Lead Assessor has now been appointed.
- Efficient, compliant ESOS reporting: we streamline the assessment process and ensure all documentation meets regulatory standards.
- Early Action Plan development: we build a robust, realistic Action Plan aligned with your audit findings and wider sustainability goals.
- Long‑term compliance strategy: we help you embed the systems and governance needed to avoid future compliance issues.
Final Message for Businesses
Being late isn’t ideal — but it’s manageable. What matters now is:
- Acting quickly
- Being transparent with the regulator
- Completing the assessment properly
- Building the foundations to avoid repeat issues
Handled well, even a late ESOS submission can become the start of a more mature, strategic approach to energy management.
