ESOS vs SECR — how the two UK energy regimes differ
ESOS is a four-yearly energy audit notified privately to the Environment Agency. SECR is an annual public disclosureof energy and emissions in the directors’ report. Different regulators, different cycles, different qualification tests — and many organisations are caught by both.
ESOS and SECR are separate duties built on the same energy data
Neither regime replaces the other. ESOS makes large organisations audit their energy use every four years; SECR makes them publish energy and emissions figures every year.
The Energy Savings Opportunity Scheme (ESOS) requires qualifying UK organisations to audit at least 95% of their energy consumption once per four-year phase and notify the Environment Agency via MESOS — there is no public disclosure, and the findings stay between the organisation and the regulator.
Streamlined Energy and Carbon Reporting (SECR) is the opposite shape: an annual, public disclosure of energy use, greenhouse gas emissions, an intensity ratio and energy-efficiency actions, published in the directors’ report under the Companies (Directors’ Report) and LLP (Energy and Carbon Report) Regulations 2018 3 — an instrument that, unlike ESOS’s, wrote its rules into two older sets of regulations and then had nothing left to do, which is why the statutory architecture behind SECR is worth reading before citing it, and why, as a Companies Act duty rather than an environmental one, it applies identically in Scotland, Wales and Northern Ireland.
Confusion between the two is common because they overlap in subject matter and in population: a large UK organisation with 250+ employees will usually be in scope for both. But the duties, deadlines and regulators never merge — compliance with one contributes nothing, legally, to the other. Both sit inside a wider set of UK carbon reporting rules whose scope tests share no numbers at all.
ESOS vs SECR — side by side
The regimes differ on every axis that matters operationally: legal basis, qualification, cycle, output, audience and enforcement.
In scope for one, both, or neither?
The qualification tests look similar at a glance — 250 employees appears in both — but they are structured differently, and the differences decide the edge cases.
- In both regimesMost common for 250+
- An organisation with more than 250 employees that also exceeds SECR's own £36m turnover or £18m balance-sheet limbs — not the higher Companies Act “large company” test, which SECR does not use — will usually owe a four-yearly ESOS assessment and an annual SECR disclosure. The sensible response is one energy dataset serving both duties.
- ESOS onlyFinancial-test asymmetry
- A high-turnover business with under 250 staff can pass ESOS's financial test (>£44m turnover and >£38m balance sheet) while failing SECR's two-of-three large-company test — or fall outside SECR because it is not a company or LLP at all (some partnerships and unincorporated bodies).
- SECR onlyQuoted companies
- Every quoted company is in SECR regardless of size, so a small listed company can owe SECR disclosures while falling below every ESOS threshold. Quoted companies carry no transport-fuel Scope 3 duty under SECR — that narrow limb applies only to large unquoted companies and LLPs — see SECR requirements for the detail.
- Group structuresCheck both, separately
- ESOS aggregates at group level — one qualifying member can bring the UK group in. SECR applies entity by entity to each company that files a directors' report, with its own parent/subsidiary exemptions. Group boundaries therefore differ between the two regimes.
How ESOS audit data feeds the annual SECR disclosure
Organisations in both regimes should run them off a single energy dataset — the four-yearly audit anchors the annual disclosure.
The ESOS energy audit produces verified consumption data across buildings, transport, industrial processes and any other organisational purpose. That same data, kept current year to year, is exactly what SECR’s annual energy and emissions figures are built from — the government’s environmental reporting guidelines 4 expect reporters to state their methodology, and an audit-derived baseline is a defensible one.
The audit’s recommendations do a second job: SECR requires a narrative of the principal energy-efficiency actions taken in the year, and the government guidance encourages connecting that narrative to ESOS findings. Acting on audit recommendations and reporting the action closes the loop. On the ESOS side, the enforcement backdrop — fines up to £50,000 and publication of non-compliance — is covered in ESOS penalties.
Looking ahead, the same dataset feeds a third regime: for listed companies, UK SRS S2 climate disclosures will require emissions figures built on actual energy consumption — see how ESOS data maps into UK SRS S2 for that bridge.
ESOS and SECR — frequently asked questions
Direct answers on scope overlap, deadlines and whether one regime satisfies the other.
What is the difference between ESOS and SECR?
ESOS is a four-yearly energy audit scheme: qualifying organisations must audit their energy use and notify the Environment Agency privately, with no public disclosure.
SECR is an annual public disclosure regime: in-scope companies must publish their energy use, greenhouse gas emissions, an intensity ratio and energy-efficiency actions in the directors' report, and in-scope LLPs publish the same information in a separate energy and carbon report — both filed at Companies House.
Different regulators, different cycles, different qualification tests — but the same underlying energy data.
Can I be in scope for ESOS but not SECR (or the other way round)?
Yes.
ESOS uses an either/or test — 250+ employees, or turnover above £44m combined with a balance sheet above £38m.
SECR's large-company test requires exceeding two of three: turnover of more than £36m, balance sheet of more than £18m, or more than 250 employees, and it also captures all quoted companies regardless of size.
Because the tests differ, an organisation can qualify for one regime and not the other, so scope must be checked separately for each.
Does ESOS compliance satisfy SECR?
No.
Completing an ESOS assessment does not discharge any SECR obligation, and publishing a SECR disclosure does not count towards ESOS.
They are separate legal duties with separate deadlines.
In practice, though, an ESOS energy audit is one of the best data sources for SECR: the audited consumption figures support the annual energy and emissions disclosure, and the audit's recommendations give the energy-efficiency-actions narrative real content.
Do ESOS and SECR have the same deadline?
No.
SECR runs on the company's own financial year — the disclosure goes in each year's directors' report.
ESOS runs in fixed four-year phases for everyone: the current Phase 4 qualification date is 31 December 2026 and the notification deadline is 5 December 2027.
Who enforces ESOS and SECR?
ESOS is enforced by the Environment Agency (and equivalent regulators in the devolved nations) with civil penalties of up to £50,000, and some offences also carry a further £500 for each working day of continued non-compliance, capped at 80 working days.
SECR sits in company law: it is policed through the Companies Act filing regime, with the Financial Reporting Council reviewing disclosure quality and Companies House able to reject non-compliant filings.
Explore both regimes in depth
Dedicated guides on each side of the comparison.
Related guides & references
Energy Savings Opportunity Scheme (ESOS) — the hub
Qualification, phases, audits and penalties — the full ESOS picture
SECR — Streamlined Energy and Carbon Reporting
The annual disclosure regime — scope, contents and the directors' report
ESOS energy audit requirements
The four-yearly audit whose data feeds the annual SECR disclosure
SECR reporting guide
Methodology, intensity ratios and the energy-efficiency narrative