Earlier ESOS phases were mostly about producing an assessment and notifying the Environment Agency. Phase 4 adds a stronger focus on action: organisations are expected to set out which energy-saving measures they intend to take, and then report on progress.
This turns ESOS from a once-every-four-years exercise into an ongoing commitment, and it is where many organisations underprepare.
What the action plan covers
The action plan sets out the energy efficiency measures the organisation intends to implement, with estimated savings and timescales, drawing on the opportunities found in the assessment.
It is approved at board level, so it needs to be realistic and owned by the people who will deliver it.
Progress updates
Organisations then report progress against the plan over the compliance period. Updates should show what has been done, what savings were achieved and any changes to the plan.
Check the Environment Agency's current ESOS guidance for exact deadlines and formats, as these are set by the regulator.
Make the plan useful, not just compliant
Choose measures with a clear owner, budget and timeline. Link them to existing capital plans, net zero targets and lease events. Use half-hourly data to show results, so progress updates are evidence-based rather than estimates.
A good plan also helps with MEES, EPC upgrades and ESG reporting.
How we help
We deliver ESOS Phase 4 assessments with Lead Assessor sign-off, then help build practical action plans and progress reporting. Read about our ESOS service or our guide to the qualification date.
General guidance; always check the latest Environment Agency guidance.
Frequently asked questions
- Do I need an ESOS action plan in Phase 4?
- Phase 4 introduces requirements to set out intended energy-saving actions and report progress. Check the Environment Agency's guidance for the exact obligations.
- Who approves the ESOS action plan?
- It is signed off at board level, alongside the ESOS assessment.
- Are ESOS actions legally binding?
- Organisations must publish and report on the plan, but the regulations focus on reporting rather than forcing every measure to be built.
- Can the action plan support net zero targets?
- Yes. Linking ESOS measures to your net zero and capital plans makes them more likely to be funded and delivered.