Maendy Primary School: 57% across eighteen months, generator and grid
52,129 kWh down to 22,636 kWh across 7 cabins, from 7 May 2024 to 31 October 2025. The longest track record in our estate, and the only one that spans a change of power source.
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What the 57% includes
This site ran on a generator until 10 September 2024 and on grid afterwards. The 57% is the whole period, and it includes the diesel saved while the generator was running: 3,792.6 litres of 5,292.
The diesel is counted once, as fuel. The generator sub-period’s kWh are those litres, so counting both would double-count the same saving. The £11,669 below is on the grid basis only, at 25p/kWh; it is not the whole-period figure converted, and the two should not be added together.
The site
| Client | Morgan Sindall / SEWSCAP 3 |
|---|---|
| Site | Maendy Primary School, NP44 1NH |
| Power | Generator until 10 September 2024, grid afterwards |
| Cabins | 7 |
| Monitored period | 7 May 2024 to 31 October 2025 (~18 months) |
The result
whole 18-month period
May 2024 to Oct 2025
at 25p/kWh
| Before | 52,128.64 kWh |
|---|---|
| After | 22,636.28 kWh |
| Saved, whole period | 29,492.36 kWh = 57% · £11,668.63 on the grid basis at 25p/kWh |
| Generator sub-period | 71%, a sub-period, not the site result |
| Grid sub-period | 43,985.87 → 20,066.97 kWh · 23,918.9 kWh saved = 54%, a sub-period, not the site result |
| Diesel saved | 3,792.6 litres of 5,292, during the generator period |
| Per cabin | ~58 kWh saved per cabin per week across the grid sub-period |
25p/kWh is the rate Morgan Sindall told us they pay on this site, and the £ figure is on the grid basis. Rates are customer-supplied and range from 24p to 30p across the sites we publish, so a £ figure from one site is not comparable with another. We never average or total £ savings across sites. Standing charge excluded. VAT excluded. Costs shown are consumption only.
Why the generator figure doesn’t transfer
Generator periods save more than grid periods because generation is less efficient, so there is more waste available to remove. 71% is a generator sub-period, not a site result, and it would not repeat on a grid-only site. We publish the whole-period figure as the result and show the sub-periods underneath it.
What we found
Which circuits ran out of hours, which drying rooms were left on, which appliances drew power nobody had accounted for: that is set out line by line in this project’s monthly report. We publish the measured result here and leave the itemised list where it was written, rather than summarise it from memory.
Ask us and we’ll take you through what we found on this site: info@gaiagroupuk.com.
What changed
Which load categories went onto contactors here is in the commissioning record for the project. We publish what was controlled and never how the rules were configured, and for this site the commissioning detail has not been written up for publication yet, so we would rather leave it off the page than approximate it.
Ask us and we’ll tell you what went under control here: info@gaiagroupuk.com.
How this was measured
Every saving above is valued at what the equipment actually drew, not at its rated power: the time a load was switched off multiplied by that load’s measured average consumption in the conditions it was running in. That average is taken across every hour in the comparison, including the hours the load drew nothing, so it accounts for the periods a thermostat would have cycled the load off anyway, which makes the figure materially smaller than rated-power arithmetic would give.
Measured against the site’s own benchmark, at circuit level, in kWh. How we calculate a saving.