Energy Savings Opportunity Scheme (ESOS) – 9th October 2025

Progress Update 1

You are reminded that the deadline for the initial progress update (PU1), which is required to be submitted following notification of the action plan, is 5 December 2025.

All ESOS participants are require to submit a PU1, regardless of whether or not their submitted action plan included proposals on any energy efficiency measures. The PU1 seeks updates on any measures in the action plan, and information about any measures implemented which were not originally proposed in the action plan.

Publication of Phase 3 Action Plan Data

The Phase 3 action plan dataset, which has now been published, contains data from action plans submitted by participants by 5 June 2025 following the submission of their Phase 3 notifications of compliance (NOCs).

The data includes:

• The name of the organisation.
• Measures that ESOS participants propose to implement by 5 December 2027 (the end of the Phase 4 compliance period).
• Dates by which the measures are proposed to be implemented (month/year).
• The total energy savings estimated to be achieved from implementing each measure.
• The total energy savings estimated for each measure broken down by organisational purpose.
• Estimation methods used to calculate energy savings.
• Any context to proposed measures (where provided).

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