How big is the solar system installed at Weston All Saints Primary School?
Alliant Energy installed a 40.95kWp solar PV system using 93 panels paired with a Solis inverter. The installation took 1 week from arrival on site to commissioning.
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Education
Weston All Saints Primary School
40.95kWp system saving £9,387 a year for Weston All Saints Primary School.
Project overview
The system will save the school nearly £10k in its first year alone. The installation at WASPS was part of a wider roll out of renewable technology at schools across the Southwest. Together, these projects represent a major step forward in the Trust’s sustainability journey, cutting carbon emissions, reducing energy costs, and supporting environmental education for pupils across the region. .e-loop-item-13340 .elementor-element.elementor-element-166d83a:not(.elementor-motion-effects-element-type-background),.e-loop-item-13340 .elementor-element.elementor-element-166d83a>.elementor-motion-effects-container>.elementor-motion-effects-layer{background-image:url("https://alliantenergy.co.uk/wp-content/uploads/2026/02/Bowland-Pennine-Mountain-Rescue-Solar-11.jpg")}.e-loop-item-13340 .elementor-element.elementor-element-166d83a:hover{background-image:url("https://alliantenergy.co.uk/wp-content/uploads/2026/02/Bowland-Pennine-Mountain-Rescue-Solar-11.jpg")}
The challenge
Like most education operations, Weston All Saints Primary School faced a structural exposure to wholesale electricity prices — a cost line that doubled for many UK businesses between 2021 and 2023 and shows no sign of returning to pre-crisis levels. With significant daytime load and suitable roof space, on-site generation was the obvious lever, but the project needed to stand on its own commercial merits: predictable payback, manufacturer-backed warranties, and zero operational disruption during install.
The solution Alliant Energy designed
Following a structural roof survey and DNO capacity check, Alliant Energy specified a 40.95kWp array using 93 high-efficiency mono-PERC panels, paired with a Solis hybrid inverter. The Solis platform was chosen for its export-management capability and remote firmware updates, allowing the array to be tuned over its life without site visits. Surplus generation is exported to the grid under a Smart Export Guarantee tariff, providing a secondary revenue stream alongside the primary saving on imported electricity.
Install & commissioning
The full installation completed in 1 week, scheduled around the customer's operating hours to avoid downtime. Work was carried out by Alliant Energy's directly employed MCS-registered engineers — no subcontracted labour. The system was commissioned to G99 requirements, registered with the Microgeneration Certification Scheme, and handed over with monitoring access, electrical certification, and structural sign-off documents on the day of completion.
Financial outcome
In its first full year of operation the system is on track to save Weston All Saints Primary School approximately £9,387 on electricity costs, with a payback term of 4.1 Years and a projected total ROI of 610%. Over the 25-year warranted life of the panels, the cumulative saving is forecast at £195,010 — a figure that improves materially if grid prices continue their long-term upward trend, and that benefits from the UK's 100% full-expensing capital allowance for qualifying solar assets.
Environmental impact
The installation displaces roughly 7.0 Tonnes of CO₂ emissions every year compared with grid-sourced electricity. Over the system's 25-year design life that is the equivalent of removing more than Weston All Saints Primary School's entire annual Scope 2 footprint several times over — a material data point for ESG, B-Corp and net-zero reporting frameworks.
Why it matters for the education sector
Education businesses typically run daytime electrical loads — refrigeration, machinery, IT, lighting, compressors — that overlap closely with solar generation. That overlap is what drives strong economics: every unit generated and consumed on-site replaces a unit that would otherwise be bought from the grid at full commercial rates. The Weston All Saints Primary School project demonstrates how the model scales for this kind of operation.
System
40.95kWp
Panels
93
Inverter
Solis
Install
1 Week
Project FAQ
How much does Weston All Saints Primary School save each year?
Weston All Saints Primary School saves approximately £9,387 per year on electricity, with projected lifetime savings of £195,010 over the system's 25-year guaranteed performance period. The payback term is 4.1 Years, delivering a total ROI of 610%.
Was the project funded or paid for upfront?
This project was paid for directly by the customer. Under the UK's full-expensing capital allowance, the entire cost can be deducted from corporation tax in year one — improving the effective payback meaningfully for profitable companies.
What's the environmental impact?
The system avoids around 7.0 Tonnes of CO₂ emissions every year compared with grid-sourced electricity. Over a 25-year design life that's a material contribution toward Scope 2 reduction and any ESG or net-zero reporting commitments the business holds.
Could a similar system work for my business?
Probably — the same hardware platform (panels, hybrid inverter, optional battery) scales from roughly 10kW up to 1MW+. The deciding factors are roof area, daytime electricity use, current unit rate, and grid-connection capacity. Alliant Energy carries out a free desktop feasibility study and follow-up site survey before quoting.
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