How big is the solar system installed at Hippo Motor Group?
Alliant Energy installed a 140.22kWp solar PV system using 319 panels paired with a SolarEdge inverter. The installation took 3 weeks from arrival on site to commissioning.
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Automotive Retail
Hippo Motor Group
140.22kWp system saving £55,698 a year for Hippo Motor Group.
Project overview
We’ve installed a 140.22 kWp system for Hippo Motor Group at their Prep Centre location. The system will generate over 114,000 kWh of energy annually representing a return on investment of just under three years! Having already seen the benefits of installing Solar PV at their main Showroom location, Hippo Motor Group approached Alliant Energy to expand on this self-generation infrastructure with an installation at their neighbouring Prep Centre. The system in place at the Prep Centre will reduce their grid energy demand by almost 35%, resulting in significant financial savings annually. On top of this, Hippo Motor Group are also not shying away from their responsibilities in reducing their carbon footprint with this installation achieving a saving of over 20 tons of CO2 annually.
The challenge
Like most automotive retail operations, Hippo Motor Group 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 140.22kWp array using 319 high-efficiency mono-PERC panels, paired with a SolarEdge hybrid inverter. The SolarEdge 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 3 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 Hippo Motor Group approximately £55,698 on electricity costs, with a payback term of 2.6 Years and a projected total ROI of 962%. Over the 25-year warranted life of the panels, the cumulative saving is forecast at £857,970 — 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 20.3 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 Hippo Motor Group'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 automotive retail sector
Automotive Retail 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 Hippo Motor Group project demonstrates how the model scales for this kind of operation.
System
140.22kWp
Panels
319
Inverter
SolarEdge
Install
3 Weeks
Project FAQ
How much does Hippo Motor Group save each year?
Hippo Motor Group saves approximately £55,698 per year on electricity, with projected lifetime savings of £857,970 over the system's 25-year guaranteed performance period. The payback term is 2.6 Years, delivering a total ROI of 962%.
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 20.3 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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