How big is the solar system installed at Riello UPS?
Alliant Energy installed a 60.35kWp solar PV system using 137 panels paired with a Solis inverter. The installation took 2 weeks from arrival on site to commissioning.
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Data & Power Systems
Riello UPS
60.35kWp system saving £16,457 a year for Riello UPS.
Project overview
The new installation will bring their level of self-sufficiency up a further 31% with annual savings over £15,000 and an additional carbon reduction of 10,310 kg CO2. .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 data & power systems operations, Riello UPS 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 60.35kWp array using 137 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 2 weeks, 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 Riello UPS approximately £16,457 on electricity costs, with a payback term of 3.6 Years and a projected total ROI of 694%. Over the 25-year warranted life of the panels, the cumulative saving is forecast at £277,760 — 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 10.3 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 Riello UPS'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 data & power systems sector
Data & Power Systems 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 Riello UPS project demonstrates how the model scales for this kind of operation.
System
60.35kWp
Panels
137
Inverter
Solis
Install
2 Weeks
Project FAQ
How much does Riello UPS save each year?
Riello UPS saves approximately £16,457 per year on electricity, with projected lifetime savings of £277,760 over the system's 25-year guaranteed performance period. The payback term is 3.6 Years, delivering a total ROI of 694%.
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 10.3 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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