How much do solar panels for shopping centres cost?

Solar for a shopping centre is priced per kilowatt of installed capacity, and the rate falls as the array gets bigger. For a retail scheme in 2026, budget around £900 to £1,200 per kW on arrays below 250 kW, £750 to £950 per kW between 250 kW and 1 MW, and £700 to £850 per kW above 1 MW. The biggest covered malls and retail parks, where arrays run past a megawatt across the roof and a car-park carport, can edge below £700 per kW once economies of scale kick in. A solar carport over the car park costs more per kW than rooftop because of the steel structure beneath the panels, but it unlocks a surface that would otherwise generate nothing and it pairs with the customer EV charging shoppers now expect.

The right number for your scheme is driven by load, not by roof area. A shopping centre's value lives in its landlord-controlled common-area demand: mall and concourse lighting, escalators and lifts, atrium and food-court ventilation, signage, water features, and car-park lighting and EV charging. That demand runs through every trading hour, which is exactly when an array generates, so a well-sized retail array self-consumes a high share of what it produces. We size from twelve months of half-hourly common-area meter data, aiming at roughly 70 to 85 percent of daytime demand, rather than simply filling the roof. Over-sizing past your self-consumption ceiling pushes more generation onto export, which earns less than the grid power you avoid.

What you actually save, and how payback is measured

The saving on a retail scheme comes mostly from avoided grid purchase. Common-area electricity in a covered mall or retail park is among the more expensive commercial supply in the country, so every self-consumed kWh displaces power bought at full retail. Surplus generation at quiet times, early mornings and out-of-season weekends, is exported and paid under the Smart Export Guarantee, though export is a smaller part of the case for an all-day retail load than it is for a seasonal site.

Simple payback (net cost divided by annual saving) is the headline most owners want, and for retail schemes it usually lands between five and six years. It is a blunt measure though. Internal rate of return and net present value over the 25-year-plus life of the array tell a fuller story, and for a landlord weighing solar against other capital projects they matter more. We model all three, plus the levelised cost of energy, so you can compare the array against your current and forecast grid tariff on a like-for-like basis. A typical retail array delivers an IRR in the low-to-mid teens over 25 years.

How retail schemes get funded

There are three routes, and the right one depends on whether you want the asset on your balance sheet. Capital purchase plus tax relief is the simplest: you buy the system and claim capital allowances against it. Solar is a special-rate plant-and-machinery asset, so the first £1m of qualifying spend is covered by the Annual Investment Allowance at 100 percent, giving a limited company up to around 25 percent effective tax relief in year one. Spend above the £1m cap on a single scheme attracts the 50 percent First-Year Allowance. Most single-centre installs sit inside the cap and are fully expensed in year one.

A power purchase agreement removes the capital outlay entirely. A funder owns the array on your roof and you buy the power it produces at a rate below your grid tariff, so you save from day one with no capex. Asset finance sits between the two: the system goes on your balance sheet but the cost spreads over seven to fifteen years, and for an all-day retail load the arrangement is usually cash-positive from year one. For a leased or multi-let scheme, the funding question runs into the landlord-and-tenant structure, who pays for the array and who banks the saving, which is normally resolved through the service charge or a green-lease rent share.

The costs people forget to budget for

The headline per-kW rate covers panels, mounting, inverters, cabling and commissioning, but a few items sit outside it. The grid connection is the first: any array above 17 kW per phase needs a G99 application to the local network operator, and on a busy network the connection can take six to eighteen months and carry a reinforcement charge. Many larger centres already have an HV connection that simplifies this, but it should be confirmed early because it is usually the longest item in the programme. A structural survey is mandatory before loading panels onto a mall or service-deck roof, and an older roof at or near the end of its life may need replacing first, in which case a combined re-roof and PV project often makes the re-roof pay for itself.

Other variables that move the price include the roof type (ballasted systems on flat membrane roofs differ in cost from rail-fixed systems on profiled metal), access and scaffolding on a multi-storey structure, the split landlord and tenant metering that has to be configured so the array feeds the right supply, and any conservation or planning constraint that forces a discreet design. Asbestos cement on older outbuildings cannot be retrofitted and needs replacement before any array goes on. We flag all of these in the feasibility stage so the budget you see is the budget you pay.

Timeline and cash flow

From first conversation to a generating array, a retail scheme typically runs six to nine months, with the grid connection setting the pace. The physical install is short by comparison, usually one to eight weeks depending on size, and rooftop work rarely disrupts trading because we phase it in zones and keep it off the shop floor. The only outage is the final grid tie-in, a few hours we book for a quiet period. From the day it energises, the array starts cutting the bill, and on the funding routes above it is structured to be cash-positive quickly rather than carrying a long negative period. The figures below give cost and payback ranges by the kind of retail and leisure scheme we work on.