Car Dealerships & Showrooms: Solar panels for supermarkets

Why car dealerships and showrooms suit solar the way supermarkets do

A car dealership carries a high, daytime-weighted electricity load that lines up with solar generation in the same way a supermarket's does. Large glazed showrooms need lighting and climate control through every opening hour, the workshop runs compressors, ramps, diagnostic and bodyshop equipment, and forecourt lighting adds to the draw. That is a strong daytime profile, and self-consumption, the share of generation used on site rather than exported, is what drives the return. The newer and faster-growing load is electric-vehicle charging. Demonstrator, courtesy and customer EV charging absorbs solar generation at full self-consumption value, which is the single most valuable kilowatt-hour on the system, so pairing PV with charging makes the business case stronger than either project alone. Typical payback sits around 5.5 years.

There is also a sector-specific push that grocery does not have. EV-era franchise agreements increasingly mandate on-site renewables and customer charging as a manufacturer brand standard, so for many dealers solar is no longer optional but a corporate-identity requirement to be met. That turns a discretionary investment into a planned one, and it makes sense to deliver the renewables and the charging together rather than as two separate projects with two sets of cost. With big flat showroom and workshop roofs and forecourt canopies all available, a dealership usually has the surfaces it needs, in the same way the supermarket alongside it does. For a dealer group weighing solar across its sites, the franchise mandate and the EV-charging synergy make the case unusually clear-cut.

What a typical install looks like and how we size it

For a dealership or showroom we usually design a system in the 50 to 400 kW range, which is roughly 92 to 740 panels across about 400 to 2,800 square metres of showroom and workshop roof, often with a forecourt or car-park solar carport added. A system that size generates in the region of 46,000 to 370,000 kWh a year and saves between 11 and 85 tonnes of CO2 annually. Sizing follows the load.

We pull at least twelve months of half-hourly meter data and, crucially, model the growth in EV-charging demand into the load before settling the final size, because demonstrator and customer charging is rising fast and a system sized only to today's load will be undersized within a couple of years. A dealership that today charges a handful of demonstrators may, within the life of the system, be charging a forecourt full of stock and a steady stream of customers, and the array should be sized for that trajectory. Where the roof runs out before the projected load does, the forecourt canopy and car-park carport add the capacity, and that midday generation goes straight into charging at the most valuable self-consumption rate.

A dealership also has a distinctive blend of loads worth designing around. The showroom is largely a daytime lighting and climate load that tracks opening hours almost exactly, the workshop runs its compressors, ramps and diagnostic equipment in a steady weekday pattern, and the bodyshop, where one is present, adds spray-booth and curing loads that are heavy but intermittent. Layered on top is the charging, which is the load most likely to grow. Reading those four together from the meter data, rather than sizing to a single headline figure, is what produces a system that self-consumes well in year one and still does so once the forecourt has fully electrified.

Costs, payback and tax relief

A dealership project typically lands between £45,000 and £350,000 depending on size and whether a carport is included, with a simple payback near 5.5 years and effectively free electricity for the years that follow. The 100% Annual Investment Allowance lets most single-site installs write off the full cost against profit in year one, worth up to a quarter of the project value back as tax for a company, with the 50% First-Year Allowance on spend above the cap. Solar is a special-rate asset, so the AIA or FYA is the relief rather than full expensing.

The Smart Export Guarantee pays for any surplus, though with heavy daytime charging absorbing generation, self-consumption tends to be high and export a smaller part of the case. The stronger the charging load, the more the return is driven by avoided import, which is the better position to be in. Our cost guide works through the figures for a single rooftop, a rooftop-plus-canopy design and a multi-site rollout.

The economics improve markedly once the charging load is layered in, which is the case unique to this segment. Every kilowatt-hour that flows from the array into a demonstrator, a courtesy car or a customer vehicle is consumed at the full self-consumption value, the most valuable output the system produces, and it displaces grid power that would otherwise be bought at the retail rate to charge that same vehicle. So as the dealership electrifies, the solar does not just sit there as a fixed saving, it grows more valuable, because there is more high-value daytime load for it to feed. Pairing the grant-funded chargers with the array is what turns two separate costs into a single, faster-paying investment.

Funding routes in detail

Funding follows the same pattern as the rest of the sector. Outright purchase captures the full saving and the year-one capital allowances. A PPA delivers solar with zero capital and day-one savings against the grid tariff, off balance sheet, which suits dealers meeting a franchise mandate without wanting to tie up showroom budget. Asset finance spreads cost over seven to fifteen years and is usually cash-positive from year one.

The grant that matters most here is the Workplace Charging Scheme, because dealerships install a lot of charging: it covers up to 75% of charger cost, five hundred pounds per socket and up to twenty thousand pounds per applicant from April 2026, capped at forty sockets, and closes permanently on 31 March 2027, so applications should go in well before then. Pairing the grant-funded chargers with on-site solar is the combination that delivers the strongest return, because the grant cuts the charger cost while the solar cuts the cost of the power that flows through it. We handle the application as part of the project.

Compliance and sector considerations

The dealership-specific consideration is the manufacturer's corporate-identity standard, which may dictate panel placement and the EV-charger provision, so we design to those rules from the outset rather than retrofit to them later at extra cost. Workshop and bodyshop areas carry COSHH and DSEAR considerations around paint, solvents and fuel, so those zones need careful electrical design and zoning during the install. Rooftop PV generally falls under Permitted Development Rights within size limits, while forecourt and car-park carports need planning permission.

A G99 application is required above 17 kW per phase, which dealership-scale systems exceed, though larger sites often have an existing HV connection that simplifies integration and shortens the timeline. We build to the SPF1981 fire-safety standard insurers increasingly require, hold OZEV approval for the charging works so the Workplace Charging Scheme grant is valid, and carry full MCS, NICEIC, RECC and TrustMark certification with the ISO 9001, 14001 and 45001 management standards that manufacturer and corporate procurement teams expect.

Where the dealership occupies a leased site, the Minimum Energy Efficiency Standard is increasingly relevant. MEES already requires at least an EPC E to let commercial property in England and Wales, and the bar is expected to rise to EPC B by 2030, so on-site solar both meets the manufacturer's renewables mandate and helps protect the building's rating and lettability. Larger dealer groups may also fall within the Energy Savings Opportunity Scheme, whose Phase 4 compliance notification is due by 5 December 2027, and a PV-plus-charging project is one of the most credible measures an ESOS audit can recommend. We map these obligations against the franchise standard so a single project satisfies the manufacturer, the landlord and the audit at once.

How we approach this kind of project

We size from your half-hourly meter data and, above all, project the EV-charging growth into the load before finalising, because a dealership's charging demand today is not the demand it will carry in two years. We design the PV and the chargepoints as a single project so the most valuable daytime kilowatt-hours go straight into demonstrator and customer charging, and we handle the Workplace Charging Scheme grant application for you. We design to the manufacturer's corporate-identity standard from day one, so panel placement and charger provision meet the franchise requirement without rework.

We zone the workshop and bodyshop areas carefully around their COSHH and DSEAR considerations, survey the roof structure up front, and submit the G99 application alongside the survey to start the grid clock. The fixed-price proposal you receive is the figure you pay, with no surprises once the work is under way. For dealer groups we roll one repeatable template across every site with portfolio pricing, a phased capital plan and a single monitoring dashboard, so the head office sees every site's generation and CO2 in one place, which is the same standardised-design approach that lets large estates deploy without bespoke engineering at every location. We schedule the install in zones around the showroom and workshop's working pattern so sales and servicing carry on, with the only real outage being the short final grid connection booked for a quiet period. Every install carries a ten-year insurance-backed workmanship warranty, with annual operation and maintenance and 24/7 remote monitoring that flags underperformance automatically.

An illustrative example

As an illustrative composite based on a typical dealership project, and not a real named client: a franchised dealer facing a manufacturer mandate to install on-site renewables and customer charging modelled twelve months of half-hourly data, then projected demonstrator and customer EV charging growth on top. A system of roughly 250 kW across the showroom and workshop roofs, with a forecourt carport, generated in the region of 230,000 kWh a year, most of it self-consumed by daytime showroom load and charging. Qualifying cost was relieved under the Annual Investment Allowance, the chargepoints were part-funded through the Workplace Charging Scheme, panel placement met the manufacturer's corporate-identity standard, and the design was templated for the dealer's other sites with portfolio pricing. The figures are illustrative and depend on your site, charging demand, tariff and franchise standard.

If your group spans more than dealerships, our pages on shopping centre and retail park solar and supermarket and convenience solar may also apply. When you are ready, see the full cost guide, read about grants and funding, request a free feasibility, or browse the FAQs first.