ESOS vs SECR: What Is the Difference and Which Applies to You?

ESOS and Streamlined Energy and Carbon Reporting are routinely conflated, usually because both apply to large UK organisations and both involve energy figures. They are, however, doing very different jobs. ESOS is an audit scheme: it requires organisations to look for savings opportunities and, since Phase 4, to say what they intend to do about them. SECR is a disclosure scheme: it requires organisations to publish energy and emissions figures in their annual accounts.

One asks 'what could you improve?' and the other asks 'what did you consume?'. Understanding which obligation you are answering prevents a great deal of wasted effort, particularly where finance and facilities teams are each assuming the other has it covered.

ESOS applies to large undertakings: broadly, 250 or more employees, or turnover above £44 million together with a balance sheet total above £38 million, assessed at a fixed qualification date. If any UK entity in a corporate group qualifies, the whole UK group is generally drawn in under a responsible undertaking.

SECR applies to quoted companies, large unquoted companies and large LLPs, using the Companies Act definition of 'large'. The thresholds are similar but not identical, and the low energy user exemption in SECR — for organisations consuming 40,000 kWh or less in the reporting period — has no equivalent in ESOS. It is entirely possible to be caught by one and not the other, which is why both should be tested separately.

ESOS runs on a four-year cycle with a compliance date, a notification to the Environment Agency, and now an action plan plus annual progress updates. SECR is annual and is published within the directors' report in the statutory accounts, meaning it is on the public record and audited alongside the financial statements.

That difference in visibility matters. SECR figures are read by anyone who pulls your accounts, including competitors, journalists and procurement teams. ESOS reports are not published in full, although notification data and enforcement actions are. Organisations often invest more care in SECR presentation as a result, while treating ESOS as a back-office exercise — arguably the wrong way round, since ESOS is where the savings actually come from.

SECR requires UK energy use in kWh, associated greenhouse gas emissions, at least one intensity ratio, the methodology used, and a narrative on energy efficiency measures taken during the year. It does not require an audit or a Lead Assessor.

ESOS requires the full twelve-month energy audit covering buildings, transport and processes, coverage of at least 95% of consumption, site visits, Lead Assessor sign-off, board approval, and the Phase 4 action plan. The evidence pack is far heavier, and the compliance risk sits with the Environment Agency rather than with Companies House.

The overlap is the underlying energy data. A single well-maintained consumption data set, built to ESOS standards of completeness, will satisfy SECR comfortably and answer most tender and lender questionnaires as well. Organisations that maintain that data set quarterly find both obligations become reporting exercises rather than data-gathering projects.

The SECR narrative on energy efficiency measures is also the natural place to reference progress against your ESOS action plan. Doing so creates a consistent story across statutory disclosure and regulatory compliance, and avoids the awkward situation of publicly claiming efficiency progress that the ESOS progress update does not evidence.

Practically, we advise clients to build the data set to ESOS specification once, refresh it annually for SECR, and refresh the audit and action plan on the four-year ESOS cycle. That sequencing means the heavier work happens once per phase and the annual obligations are comparatively light.

Oak Tree Rule supports both through ESOS compliance and commercial energy audits structured so the outputs serve statutory reporting as well. Get in touch if you want the two aligned.