How much do solar panels for supermarkets cost?

Solar for a supermarket or convenience store is priced per kilowatt of installed capacity, and the rate drops sharply as the system gets bigger. A small convenience-format array below 100 kW typically lands between £900 and £1,100 per kW. A mid-sized store system between 250 kW and 1 MW sits around £750 to £950 per kW. The largest distribution and fulfilment roofs above 1 MW can fall toward £600 per kW. So a 200 kW corner-store project might cost from roughly £150,000, while a 1.5 MW distribution-centre roof can reach £1.2m. The numbers in the cards below come straight from our sector cost model and reflect 2026 UK pricing for grocery and food retail.

What makes supermarket solar stand out is not the price, it is the payback. Refrigeration runs 24 hours a day, seven days a week, so a grocery site uses a very high share of everything its roof produces. We routinely see self-consumption above 90 percent on refrigeration-heavy stores, which means almost every generated unit displaces grid electricity you would otherwise have bought at full retail rate rather than being exported cheaply. That is why payback for the segment is typically around five years, among the fastest in commercial solar, and why a store often saves more in cash terms than a comparable office or warehouse of the same size.

What drives the price up or down

Two stores of identical floor area can quote very differently. The biggest variables are roof condition and electrical infrastructure. A modern clear-span steel or membrane roof in good order is the cheapest to work on. An older roof, or one carrying asbestos cement on an ageing store or outbuilding, cannot be retrofitted and needs replacing first, which the PV business case can sometimes absorb. A structural survey is mandatory before loading panels onto any store or distribution roof, because food-grade and refrigeration plant areas need careful penetration and cable-routing design.

On the electrical side, grid connection is often the longest pole and a real cost line. A G99 application is required for any connection above 17 kW per phase. Many larger supermarkets and distribution centres already have a high-voltage connection that simplifies integration, while smaller convenience stores on older single-phase supplies may need a Distribution Network Operator upgrade before a meaningful system can be added. DNO connection on a capacity-constrained network can take anywhere from six to eighteen months, so we submit the application alongside the structural survey to start the clock immediately. Other line items to expect are scaffolding or access equipment, an upgraded distribution board where needed, and metering for export.

Financing: cash, asset finance, or a PPA

Most grocery operators choose between three routes, and the right one usually depends on the capital budget rather than the engineering. A cash purchase claims the full Annual Investment Allowance in year one. Because solar is a special-rate plant-and-machinery asset, the first £1m of qualifying spend is covered at 100 percent under the AIA, giving a limited company up to a 25 percent effective tax saving in the first year. You can read more on capital allowances at GOV.UK. A worked example: a £400,000 store array fully expensed under the AIA cuts roughly £100,000 off the corporation tax bill in year one, so the real net cost is closer to £300,000 against savings of £80,000 to £100,000 a year.

Asset finance keeps the system on your balance sheet but spreads the cost over seven to fifteen years, and for a daytime-occupied grocery site it is usually cash-positive from the first month: the monthly finance payment is lower than the energy saving. A power purchase agreement, or PPA, needs no capital at all. A funder owns the system and you simply pay per kWh consumed at a rate below your current grid tariff, with savings from day one and the asset off your balance sheet. For multi-site estates, an operating lease gives predictable per-store monthly cost and suits a phased rollout across dozens of premises.

How we measure payback

Simple payback, the install cost divided by the annual saving, is the figure most operators ask for first, and for refrigeration-heavy grocery it lands around five years. But it ignores the time value of money and the system's full 25-year life, so we also model internal rate of return and net present value over the asset's lifetime, plus the levelised cost of energy, which is what each generated kWh actually costs you over 25 years compared with the grid. On a typical store that LCOE comes in well below the prevailing commercial tariff, which is the real reason the investment makes sense: you are locking in cheaper power for two and a half decades, not just earning back the capital.

Cash flow and the export angle

From contract to commissioning, expect four to nine months, with the grid connection the longest item. The physical install runs one to eight weeks depending on size, and rooftop work almost never requires the store to close. For a cash-funded project the cash flow profile is a single outlay, the year-one tax relief, then a steadily growing saving as grid prices rise. Because refrigeration self-consumes so much generation, the Smart Export Guarantee is a smaller part of the grocery case than it is for seasonal or weekend-only sites, the value is overwhelmingly in avoided cost, not export income. Where roof area is limited, a solar carport over the car park adds capacity and pairs with customer EV charging that absorbs midday generation at full self-consumption value.