From ESOS Recommendations to Delivered Projects: Closing the Implementation Gap

Across three phases of ESOS, the recurring criticism of the scheme has been that it identifies large volumes of cost-effective savings that are then never implemented. The audits were not wrong; the organisations simply had no mechanism to convert a consultant's register into funded work. Phase 4's action plan and progress reporting exist precisely to close that gap.

Closing it is less about technical sophistication than about process. The recommendations that get delivered are the ones that have an owner, a budget line, a defined completion date and a measurement plan. Those that do not get delivered are usually those written in a form no procurement or finance function can act on.

A recommendation reading 'improve lighting controls' is not actionable. One reading 'install PIR occupancy sensing to 240 luminaires in Zones B and C at the Coventry DC, estimated capital cost £14,000, estimated saving 68,000 kWh per year, verified via sub-meter DB3' can be turned into a purchase order.

Brief your Lead Assessor at the outset that you want recommendations at this level of specificity for the top ten measures by value, even if the long tail remains generic. It costs a little more assessor time and transforms the usefulness of the output.

Simple payback is the default ranking, but it is a poor sole criterion. A two-year payback measure requiring a full plant shutdown may be undeliverable, while a four-year measure that can be executed during scheduled maintenance is straightforward. Rank measures on payback, capital requirement, operational disruption, confidence in the saving, and dependency on other works.

Dependency matters most. Fabric and controls improvements should precede heat pump sizing; metering should precede any measure whose saving needs verification. Getting the order wrong means either oversized plant or unverifiable claims, both of which cost money later.

The most reliable funding model is a recycling fund. Low-cost, fast-payback measures — controls, scheduling, setpoint optimisation, leak repairs, voltage optimisation where appropriate — are delivered first, and the verified savings are ring-fenced to finance the capital-intensive measures in years two to four.

This requires finance to agree that savings are retained rather than absorbed into general budget, which is a governance conversation rather than a technical one. The board-approved action plan is the ideal moment to have it, because the trajectory of measures is already in front of the directors.

Verification is what makes the second round of funding possible. Establish a baseline before works, normalise for weather and occupancy, and compare over a period long enough to be meaningful. Where the saving is material, sub-metering is worth the capital; where it is modest, a documented degree-day normalised comparison is proportionate.

Verified savings also feed directly into the ESOS annual progress update, SECR narrative and any lender or investor reporting, so the measurement effort serves several purposes rather than one.

Four years is longer than many energy or facilities roles last. The programme needs to survive handover, which means documentation held centrally, named accountable owners refreshed annually, and a standing agenda item at an existing management meeting rather than a dedicated forum that quietly stops being convened.

Oak Tree Rule supports clients from ESOS assessment through implementation planning and verification, including thermography and metering surveys where measurement is needed. Talk to us about closing the gap between report and delivery.