In a hotel, an office or a shopping centre, energy is a structural cost. Energy efficiency cuts that cost permanently, and CAE add income tied to that same saving. This guide explains how both effects combine and which measures hold the most certifiable potential.
Two effects on the same project
Bill savings are recurring: every year less energy is consumed and spend goes down. A CAE is one-off income linked to the final-energy saving certified for the measure. They do not compete; they add up on the same investment.
In decision terms, CAE acts on CAPEX (it lowers the net cost of the investment) and bill savings on OPEX (they lower annual spend). A project whose payback was hard to defend without certificates can fall within the approval threshold once CAE income is included.
Bill saving
OPEX · recurring
Fewer kWh consumed every year, across the whole useful life of the equipment or improvement.
CAE income
CAPEX · one-off
Monetisation of the final-energy saving certified in the project's application.
Where the tertiary potential sits
Potential is not evenly spread. Buildings with long schedules and intensive consumption — hotels, healthcare, food retail, large offices — hold the biggest savings per euro invested.
These are the measure families that most often lead to an application in the tertiary sector.
| Measure | Best fit | Technical note |
|---|---|---|
| BACS building automation | Air-conditioned buildings with variable schedules | Acts on existing consumption without replacing equipment. |
| Chiller and heat pump replacement | Hotels, healthcare, offices | The saving depends on seasonal performance and operating hours. |
| LED lighting with controls | Retail, car parks, light industry | Presence detection and dimming widen the recognised saving. |
| Envelope and windows | Older buildings with high thermal demand | The calculation depends on the climate zone. |
| Heat recovery on ventilation | Kitchens, technical rooms, hospitals | Requires airflow and operating-hour data. |
What an application needs to move forward
The difference between an application that progresses and one that stalls is rarely technical: it is documentary. Verification checks consistency between what is declared and what invoices, equipment datasheets and photographs prove.
So gather the information before the works close: once the equipment is installed and the invoice issued, fixing a documentary inconsistency costs far more time.
- Real building data. Floor area, installed capacity, operating schedules and climate zone.
- Consistent invoices and datasheets. Model, capacity and efficiency of installed equipment must match across all documents.
- Ownership of the saving defined. In leased buildings or under energy performance contracts, the transfer is documented contractually.
- Dates within scope. Execution and invoice dates determine the eligibility of the measure.
Frequently asked questions
- Can we aggregate several sites into one application?
- Yes. When a single measure falls short of the minimum saving threshold, several measures from the same owner can be filed together.
- Does a refurbishment already completed count?
- In certain cases yes, if dates, the applicable sheet and documentary evidence allow it. That is the first check.
- Does a leased building change anything?
- Not the saving, but who can monetise it. Contracts must make the owner of the saving clear.
From analysis to investment decision
Sequence matters. First confirm eligibility and the applicable sheet; then calculate the certifiable saving with real data; only then can CAE income enter the business case with a range that stands up in front of finance.
For a multi-site company, prioritise: starting with the asset with the longest operating hours validates the method on one application and lets you replicate it across the portfolio.
Next step for companies
Share the basic building data and the planned or completed measure. We return the fit with the applicable sheet and the evidence required, at no cost.
How we work with a company
The starting point is usually a list of assets and a rough idea of planned investments. On that basis we run a quick portfolio read: which buildings consume intensively, which measures are already decided and which were being dropped on payback grounds. That cross-check already shows where meaningful certifiable saving sits and where opening an application is not worth it.
Next we pin down the applicable sheet for each measure. This step avoids the most common corporate mistake: sizing a project around expected income the sheet does not recognise. Better to adjust the expectation at the start, with real building data, than to correct it once the investment is committed.
With the sheet identified, the saving calculation relies on information the owner already holds: usable floor area, installed capacity, opening hours, climate zone and, where available, consumption history or an energy audit. The stronger that base, the narrower the estimated saving range and the easier it is to defend internally.
The final stretch is documentary, and it is usually what decides timelines: invoices, technical datasheets for installed equipment, a photographic report and ownership documents. Working from a single document list, closed at the outset, is what separates an application that completes from one waiting on clarifications.
When a company runs several sites, we recommend starting with a pilot application on the asset with the longest operating hours. Once the method is validated and real timelines observed, replicating across the portfolio is far faster because data collection is already systematised.
One detail that saves time: appoint a single company contact with access to invoicing, maintenance and the works. Most delays do not come from the administration, but from how long a document takes to travel between three internal departments.
Finally, the application leaves an ordered record of the saving achieved on each asset. That record is reusable: it supports internal energy monitoring, justifies the investment to management and speeds up preparation of the next measures in the same portfolio.