Retail Parks & Retail Property: Solar for Commercial Property

Retail property is one of the few asset classes where the building’s trading pattern lines up almost perfectly with when the sun shines. A retail park, a supermarket, a parade of high-street units or a single big-box warehouse store draws its heaviest load between 9am and 6pm — refrigeration, lighting, ventilation, tills and increasingly EV chargers — which is exactly the window a rooftop array generates in. That alignment makes self-consumption easy to achieve, and self-consumption is the single biggest driver of return. The challenge for an owner is rarely the engineering. It is who pays for the array and who keeps the benefit, because most retail is let — and that is the problem this page is built to solve.

The ownership problem in retail property

In a multi-let retail park or a parade of shops, the meters belong to the occupiers. Under a typical full repairing and insuring (FRI) lease the tenant pays the energy bill and the business rates, so if a landlord pays £200,000 to install solar that feeds tenant supplies, the tenant banks the saving and the landlord earns nothing. That is the split incentive, and it stops the majority of well-intentioned retail solar projects before they start. We design around it rather than ignoring it. There are five workable ownership routes through the split, and on a retail asset usually two or three of them run side by side.

The first is the landlord common-parts supply. Retail parks carry meaningful landlord-controlled load that no tenant touches — car-park and estate lighting, pylon signage, CCTV, barriers, shared welfare blocks, pumping stations and, more and more, communal EV charging. A landlord who installs solar against the common-parts meter pays for the array and consumes the output, with no split incentive to unpick. It is the cleanest place to start and it directly cuts the service-charge energy line, which keeps occupiers happy at review. Our common parts and landlord supply guide sets out how to identify and meter that load.

The second is the landlord-to-tenant PPA. Here the landlord (or a funder) owns the array and sells the generated power to the occupying retailer behind the meter at a tariff set below the grid price — so the tenant saves from day one, the owner earns a contracted return over 15 to 25 years, and the asset stays on the landlord’s balance sheet improving the EPC. For an anchor unit or a single-let big-box store this is often the strongest structure. The third route is the roof or airspace lease — selling the roof to a developer who funds and owns the system while the owner takes ground rent and the tenant takes a discount; useful where the owner does not want the capital outlay, though it is a registrable interest with SDLT, Land Registry, mortgagee-consent and insurer consequences that need handling properly. The fourth, on a managed estate, is the green lease, where a capped tenant contribution funds the array against the tenant’s own savings using the BBP Green Lease Toolkit framework. And where you own and occupy the unit yourself, you simply take 100% of the economics. We model these routes side by side and recommend the one that fits the tenancy schedule and your hold strategy — the full comparison is in the split incentive solved.

Car-park canopies: the retail-specific opportunity

Retail parks have something most commercial assets do not: acres of surface car park sitting under open sky. Since the planning rules changed, that tarmac is now a generating asset. Solar car-park canopies are permitted development under Class OA for solar equipment over off-street parking, subject to limits — the canopy must not exceed 4 metres in height, must sit at least 10 metres from the curtilage of a dwelling, and a prior-approval application covers design, siting and glint/glare. That last point matters near roads and flight paths and is a genuine assessment, not a formality.

Canopies do three jobs at once. They generate at scale — a 200-space car park can host several hundred kW. They create covered, dry parking, which is a real amenity that helps re-letting and footfall. And they provide the natural structure and DC supply for EV charging, which is fast becoming a condition of occupancy for grocery and retail-park tenants. For an owner, a canopy converts unproductive land into a revenue and a tenant-attraction feature in one capital project. The grid connection is usually the gating factor rather than the planning step — anything above roughly 50kW needs a G99 DNO connection, and on retail parks the available capacity is often the real constraint on system size. Our planning and grid guide walks through Class OA, Class J rooftop prior approval and the connection process.

MEES: the exposure is acute in retail

Retail carries some of the sharpest MEES risk of any asset class. Since 1 April 2023 it has been unlawful to let a commercial building in England and Wales below EPC E — that applies even to sitting tenants, and it is the only binding standard in force today. The widely repeated “EPC C by 2027” target was scrapped, and “EPC B by 2030” was never law. What is real is a government proposal, set out in the interim response published on 18 June 2026, for EPC B by 2031 — but only for privately rented non-domestic buildings over 1,000 m², only where cost-effective, and only once secondary legislation is made. Treat it as a proposal to plan around, not a current obligation. England and Wales only.

The scale of the problem is what makes retail urgent. Savills estimates around 185 million sq ft of UK retail floorspace is at risk of becoming unlettable as standards tighten, and the British Property Federation found in October 2025 that roughly 83% of commercial buildings across seven major UK cities sit below EPC B. Older retail stock — single-glazed parades, big-box sheds with poor fabric — is heavily represented in that tail. Solar is one of the most cost-effective ways to move the needle: a rooftop array typically lifts a commercial EPC by one to three bands, though we never promise a specific jump because the starting fabric and the assessor’s inputs govern the result. For a landlord facing a unit slipping toward sub-E, generation plus the supporting fabric measures can be the difference between an asset that lets and an asset that strands. The penalties focus the mind too — under three months of breach can cost up to 10% of rateable value (capped at £50,000) and three months or more up to 20% (capped at £150,000), plus a public entry on the breach register. The full picture is in our MEES and EPC guide.

Sizing and economics

Retail systems typically land between 100kW and 750kW depending on roof area, car-park footprint and grid capacity, with project values from around £82,000 to £600,000 ex-VAT (commercial installations have been zero-rated for VAT since April 2022). At a UK yield of roughly 950 kWh per kWp per year, that produces somewhere between 95,000 and 712,000 kWh annually. Because retail load is concentrated in daylight hours, a solar-only system on a trading unit often self-consumes 50–70% of what it generates, and a supermarket or a 24-hour store with refrigeration can push higher still. Every unit self-consumed displaces grid electricity at roughly 24–28p; surplus exported to the grid earns a Smart Export Guarantee (SEG) rate, typically around 12–16p on a good agnostic fixed tariff — a useful top-up, not the headline return.

Capital cost runs at about £700–£1,100 per kWp, falling as the system scales. Payback on retail assets usually sits around six years, and faster on high-load refrigerated sites; the Annual Investment Allowance (the £1m permanent allowance that gives 100% first-year relief on solar as a special-rate integral feature) plus the business-rates exemption can shave one to two years off the post-tax figure. Note the relief mechanics: solar bought to lease — as in a roof-lease or PPA structure — relies on the AIA plus the 6% writing-down allowance rather than full expensing, which is why the ownership route and the tax position have to be modelled together. Rooftop solar and any co-located battery are 100% exempt from business rates in England to 31 March 2035. Our cost page breaks the numbers down by system size.

A worked example (illustrative)

Consider a mid-size retail park: four units plus a landlord common-parts supply, a 180-space car park, and an owner holding the asset in a fund. The figures below are illustrative, not a quote.

• Rooftop array (anchor unit): 250kW, ~£185,000, structured as a landlord-to-tenant PPA with the anchor grocer. Generation ~237,500 kWh/yr, ~65% self-consumed by the store’s refrigeration and lighting.
• Car-park canopy (Class OA): 200kW over 90 spaces, feeding the common-parts supply and a bank of EV chargers. Generation ~190,000 kWh/yr.
• Common-parts saving: estate lighting, signage and EV load met largely from the canopy, cutting the service-charge energy line and helping every occupier’s outgoings at review.
• EPC effect: the anchor unit lifts an estimated one to two bands, moving it clear of the sub-E risk zone and protecting its lettability.
• Blended position: PPA income on the rooftop, direct savings on the common parts, a tenant-attraction amenity from covered EV parking, and a measurable ESG and EPC gain across the estate — payback on the combined capital in roughly five to seven years.

No two retail assets price the same way: tenancy schedules, roof condition, grid headroom and glint/glare all move the numbers. The point of the example is the structure — different ownership routes layered across one site so the right party pays and the right party benefits. To model your own asset, request a quote.

Common questions

Can I recover the cost of the solar through the service charge?

No. Under the RICS Service Charges in Commercial Property professional statement (2nd edition, in force 31 December 2025) the initial capital cost of new plant such as a solar array is not recoverable through the service charge. You recover it instead through a PPA tariff, a capped green-lease contribution from the benefiting tenant, or by reflecting the improvement in rent. The ongoing running and maintenance of the system can sit within the service charge, but the upfront capital cannot — which is precisely why the ownership structure has to be settled before the project, not after. We model the recovery route alongside the engineering.

Do solar car-park canopies need full planning permission?

Usually not. Since the rules changed, solar equipment over off-street parking is permitted development under Class OA in England, subject to limits — the canopy must not exceed 4 metres in height and must sit at least 10 metres from the curtilage of a dwelling — with a prior-approval step covering siting, design and glint/glare. That glint/glare assessment is a genuine one, particularly near highways or aerodromes, so it is not a free pass. Listed buildings and sites under an Article 4 Direction are excluded. England only. Above roughly 50kW the G99 DNO grid connection, not the planning step, is normally the real timeline driver — we resolve the connection question early, as set out in our planning and grid guide.

What happens to the solar if my retail tenant changes?

That depends on the ownership route, which is why we choose it deliberately. If the array sits on the landlord common-parts supply, a tenant change has no effect — you own and consume the output regardless. If it is a landlord-to-tenant PPA, the agreement typically binds the unit and is assigned to the incoming occupier on assignment, so the income continues; a well-drafted PPA and lease handle this cleanly. Where solar is already in place on a unit you buy or sell, a section 198 fixtures election is needed to fix the capital-allowances position between the parties. We build the tenancy-change and reversion considerations into the structure from the outset, and our split incentive guide covers how each route behaves on a change of occupier.