ESOS action plan — what to include, deadlines, submission

The ESOS action plan deadline — and the seven that follow it

Eight dates run from the Phase 3 action plan in December 2024 to the final Phase 4 progress update in December 2031. Most published timelines stop at 2030.

The full ESOS deadline tracker carries the audit and qualification dates alongside these; this page carries the action plan cycle.

Which of these dates are actually yours?

Four questions. The answer is a dated list of the action plan obligations that apply to your organisation, with the regulation behind each one.

This tool computes from what you enter and nothing else. It does not decide whether you qualify for Phase 4 — the qualification test itself lives on the ESOS Phase 4 compliance guide, which owns that question. Nothing you type leaves your browser.

What SI 2026/701 changed about action plans

Three amendments, all in force since 22 July 2026, and all of them about the plan you have already filed rather than the one you have yet to write.

The direction of travel is one thing: the action plan is being made auditable. Each amendment converts something that used to be narrative into something with a unit, a category, or a required explanation. The full instrument is on legislation.gov.uk, and ESOS legislation sets out how the 2014, 2023 and 2026 instruments fit together.

The action plan review — the part no competing guide names

Regulation 27E is four lines long and it changes what an action plan is for.

Read the phrase “and are not expected to be” carefully. The review is not a retrospective tally of what slipped. It asks you to make a forward judgement, in a statutory submission, about measures you have not yet abandoned.

A measure still notionally on the capital plan for 2027, which you privately know will not land, has to be declared as not expected to be implemented — with a reason.

Three consequences follow, and none of them are on the first page of Google.

The practical implication is about people, not paperwork. The reasons a 2024 measure was not implemented are known in 2026 by the engineer, the finance lead or the site manager who made the call. By December 2027 some of them will have left. Recording the reason now, against the measure, is the whole job.

Compose your regulation 27E review

Enter the measures from your current action plan and mark what happened to each. This produces the two statutory blocks your Phase 4 notification has to carry — the 27E review and the 27D achieved-savings statement — and flags anything the regulations would treat as incomplete.

Working text, not a submission. The wording of your notification is yours and your lead assessor's responsibility, and a false or misleading statement in a notification is an offence under regulation 47 — up to £50,000 and publication [6]. Nothing you type leaves your browser.

The savings you actually achieved, in kWh

The companion duty to the review, and the one that changes what your monitoring has to be able to produce.

Regulation 27D requires an estimate of the energy savings your organisation achieved during the compliance period — for Phase 4, the whole span from 6 December 2023 to 5 December 2027 — expressed in kWh [8].

It is not a single number. The notification carries four separate things: the total, a breakdown by organisational purpose, the measures that produced the savings, and for each measure its energy-saving category and its own kWh figure [10].

The unit matters more than it looks. Until 22 July 2026 the equivalent progress-update field read “energy measurement units”; regulation 28 changed it to kWh [7]. An organisation whose measures are tracked in litres of diesel, therms, or tonnes of steam now has to convert, consistently, and keep the conversion basis — because the same measure will be reported again in 2029, 2030 and 2031.

If your energy audit estimated a measure's saving one way and your monitoring reports it another, the variance shows up in the progress update, not in an internal review.

What the Scheme Administrator actually publishes

Appendix B of the Phase 4 guidance carries a column headed “Published by the scheme administrator?” against every field in the notification. It is the most precise answer available to the question everyone asks, and it is not on any competing page.

Every row is quoted from Appendix B: Information to provide through the ESOS notification system (ODT, 30 July 2026), Table B10, with the regulation reference the Appendix gives [10]. Appendix B is guidance; where it and the ESOS Regulations 2014 as amended conflict, the regulations take precedence — the Appendix says so itself [4][10].

There is no fine for missing an action plan — and that is not the end of it

Two things are true at once, and most guidance carries only the first.

The Environment Agency's Phase 4 guidance states that regulators “will not take enforcement action or issue a penalty relating to the non-submission of an action plan or progress update” [6]. There is no civil penalty attached to the action plan duty. Any guide telling you a missed action plan carries a fine is describing a regime that does not exist.

The second thing is what replaces it, and it is in Appendix B rather than in the guidance body, which is probably why nobody has written it down.

So the sanction is not a penalty. It is a declaration you have to make about yourself, three years later, in a director-signed statutory submission, which is then published on the register alongside your name.

And a false or misleading statement in that notification is an offence — regulation 47, up to £50,000 plus publication [6]. The route from “no penalty for the action plan” to a penalty runs through mis-stating the review, not through missing the plan.

The penalties that do attach to ESOS attach elsewhere: failure to notify (reg 43, up to £5,000 plus £500 a working day capped at 80 days), failure to keep records (reg 44), failure to undertake an audit (reg 45, up to £50,000), and failure to comply with a notice (reg 46) [6]. ESOS penalties sets out the whole schedule.

What an ESOS action plan must include

Four required fields and two that separate a plan which survives three public progress updates from one that does not.

The two good-practice rows are the practical advice this page can give that the regulations do not: build the plan in the shape the review will ask for. Reg 27D and reg 27E did not exist when Phase 3 plans were written, which is precisely why reconciling a 2024 plan against them in 2027 is work.

Keep the content suitable for disclosure. Plans and updates are published; commercially sensitive operational detail can be summarised at measure level without losing the substance.

Is there an official ESOS action plan template?

No — and the honest version of that answer is more useful than the answer itself, because GOV.UK does publish two templates and neither is the one people are looking for.

The Environment Agency's Phase 4 publication page carries exactly six documents [5]. We checked it directly on 8 August 2026. None of them is an action plan template.

So the practical answer has two halves. The plan itself is entered into the MESOS form against the categories the regulations set — there is no document to download and fill in. The content can be prepared in advance, and that is what a template is actually for.

ESOS action plan submission — the MESOS sequence

Online only, through one Environment Agency service, in an order that cannot be varied.

One consequence of step 1 is worth stating plainly: an organisation that never filed its Phase 3 notification has not simply missed one deadline. It cannot file the action plan, and it cannot file either progress update, because the service will not let it — and the notification failure is the one that carries a civil penalty [6].

Where the ESOS action plan guidance actually lives

Four documents, in the order you would read them, and what each one is good for.

The GOV.UK ESOS scheme hub sits above all four and is the right first stop for anything outside the action plan cycle [2].

One caution about older material. A large amount of published commentary predates 30 July 2026 and says Phase 4 guidance was expected in early 2027. It was published on 30 July 2026, and the position on DECs, Green Deal Assessments, ISO 50001 coverage and the number of progress updates all changed with it. Check the date on anything you read, including ours — this page was last verified on 8 August 2026.

ESOS progress updates and progress reports

Phase 3 carries two. Phase 4 carries three. They are the same instrument, filed annually, and they are the part of the cycle most often missed.

A progress update reports implementation against the action plan for the year: what was installed, what it saved against what you estimated, why anything varied, revised timescales, and any measure added since the plan was filed [1][2].

“Progress report” is not a term the regulations use. The statutory instrument is a progress update under regulation 34B, and searching for one will find the other.

The third Phase 4 update comes from regulation 28 of SI 2026/701, which inserts a requirement for a final update “during the period starting on the three year anniversary of the first day of the relevant compliance period and ending on the day before the four year anniversary”, for compliance periods ending on or after 5 December 2027 [7].

Regulation 28 also exempts participants relying on regulation 33A — the zero-consumption route — from the progress update duty [7].

The ESOS Phase 4 action plan — what comes next

A new plan follows the Phase 4 notification, and it commits you for four years rather than three.

The Phase 4 action plan is due 5 December 2028 and covers 6 December 2027 to 5 December 2031 [6]. That window is the reason there are three progress updates rather than two: a longer commitment period gets an extra checkpoint.

Writing it is a different job now that reg 27D and reg 27E exist. A Phase 4 plan will be read back in the Phase 5 notification the same way the Phase 3 plan is being read back now — so the estimation method, the category tagging and the organisational-purpose split are worth settling once, at plan stage.

Phase 3 is history — except for the parts that are not

The Phase 3 action plan deadline passed on 5 December 2024. Two obligations arising from it are still live, and one of them is the next date in the scheme.

The headline ESOS action plan deadline for the Phase 3 cycle was 5 December 2024. The Environment Agency operated an extended acceptance window after it, during which late submissions were accepted without remedial action.

We have not been able to locate a primary Environment Agency publication stating the closing date of that window, although a specific date circulates widely in secondary sources. Rather than restate an unsourced date, the accurate position is this: the extended window is closed, and a Phase 3 participant that has still not filed should file now — there is no penalty for the late action plan itself, and filing removes the reg 27E(2)(c) declaration from your Phase 4 notification [6][10].

That last point is the practical reason to act on a two-year-old deadline. Filing the plan late is not penalised. Not filing it at all becomes a published statement about your organisation in December 2027.

The same data, in your climate disclosures

An action plan is quantified, signed off by a responsible officer, dated and externally published. Very little else an organisation produces is all four.

For organisations that also report climate disclosures, the action plan cycle is an asset rather than a duplicate burden. The measures, their estimated savings and their delivery timescales are the same underlying data that UK SRS transition planning disclosures ask for, and the achieved-savings figures reg 27D now requires are exactly the kind of implementation evidence a transition plan is judged on.

The same figures support the energy-efficiency narrative in SECR energy and carbon reporting, and the metrics-and- targets pillar under UK SRS S2.

The regimes stay distinct — SI 2026/701 did not align the ESOS and SECR thresholds, and that alignment remains deferred [9]. But ESOS and UK SRS integration sets out where the same data can legitimately serve both, which is most of it.

Doing it in-house, or not

Most action plans are written in-house from the assessment. Two situations reliably justify outside help.

The plan itself is not technically hard: the measures come from the ESOS assessment, and the estimates come from the audit. Most organisations draft it internally and have their lead assessor review it.

ESOS consultants and assessors covers how the market is structured and what to ask for. ESOS requirements sets out the wider duty set if you are checking scope before deciding.