Energy Savings Opportunity Scheme (ESOS) – 10th September 2026
The deadline for submitting your further progress update is 5 th December 2026. You must complete
the second of the two progress updates if you are:
- A responsible undertaking which submitted an initial progress update for the third compliance period under an existing MESOS account.
- An undertaking that has left its highest parent group / participant following the submission of the initial progress update, which has not agreed to comply with its previous or new group so must comply on its own behalf as the responsible undertaking, under a new MESOS account.
Participants must report whether, since submitting their initial progress update, if they have implemented any further measures from their action plan or any measures not included in it. For each implemented measure, they must estimate the reduction in energy consumption achieved between 6 th December 2025 and 5 th December 2026.
Participants may also optionally provide estimates for this period for measures previously reported as implemented in the action plan or initial progress update.
The Environment Agency collates this data for publication of all progress updates on Energy Savings Opportunity Scheme – National Data Library.
Late submission or non-submission of the further progress update may result in enforcement action by your regulator.
All organisations that qualify for ESOS must submit a NOC, action plan and initial progress update, even if their action plan does not propose any measures. Organisations that have not met these requirements are being investigated by the relevant compliance body and may face enforcement action.
Organisations that have not met these requirements may be at risk of enforcement action and should contact the Environment Agency immediately for advice on next steps.
