Advantages and Disadvantages of Solar Energy for UK Businesses: 20 Key Factors

The main advantages of solar energy for UK businesses are lower electricity bills, valuable tax reliefs, protection from price volatility and reduced Scope 2 emissions. The main disadvantages are the upfront cost, dependence on daylight, roof and grid constraints, and ongoing maintenance. Solar delivers the best return on sites that use most of their electricity during daylight hours.

This guide sets out the 10 advantages and 10 disadvantages that matter most for commercial, industrial and public sector organisations in the UK. It is written for business owners, finance directors, facilities managers and sustainability leads who need to judge whether solar PV is right for a specific site.

Key Takeaways

• Commercial solar costs around £700 to £900 per kWp installed in 2026, so a 100kWp system typically costs £70,000 to £90,000.
• A UK commercial system generates roughly 850kWh per kWp per year, consistent with EvoEnergy’s forecasts for Aldi Bardon and Howdens Goole.
• Self-consumption drives payback. Each self-consumed kWh avoids an average of 24.51p (DESNZ, Q2 2026), while exported kWh earn considerably less.
• Businesses can claim 100% Annual Investment Allowance up to £1m, and companies can use a 50% first-year allowance; onsite renewables in England are exempt from business rates until 31 March 2035.
• Commercial solar is charged 20% VAT. The 0% rate applies only to residential and charitable buildings.
• Grid connection is the most common source of delay; systems above 16A per phase need G99 approval from the DNO, and export limits are common in constrained areas.
• Panels degrade by about 0.5% per year (NREL), and fire-safe design should follow the RC62 Joint Code of Practice.

Advantages & disadvantages of solar energy at a glance

advantages of solar energy for UK businesses

Solar PV lets a business generate part of its own electricity on site, which reduces grid imports, cuts energy costs and lowers reported emissions. The ten advantages below are grouped broadly into financial, environmental, energy security, reputational and operational benefits.

1. Lower electricity bills and export income

Every kilowatt-hour (kWh) a business generates and uses on site is a kWh it does not buy from the grid. For UK businesses, that avoided cost is substantial: according to the Department for Energy Security and Net Zero (DESNZ), the average non-domestic electricity price including the Climate Change Levy (CCL) was 24.51p per kWh in April to June 2026, up 2.0% year on year.

Self-consumed solar also avoids the Climate Change Levy, which rose to 0.801p per kWh on 1 April 2026 under HMRC’s published rates, because the levy is charged on supplied electricity rather than electricity a business generates itself.

Surplus electricity can be exported. Solar installations up to 5MW are eligible for the Smart Export Guarantee (SEG), regulated by Ofgem, provided they have MCS certification (or an equivalent for larger systems) and a half-hourly export meter. Larger exporters usually agree export terms directly with a licensed supplier.

2. Tax reliefs and business rates exemption

UK businesses can deduct some or all of the cost of a solar PV system from taxable profits in the year of purchase. Solar panels are classified by HMRC as special rate assets, which gives several routes to relief:

Before this exemption, onsite solar could increase a property’s rateable value. Scotland and Wales run their own non-domestic rates systems, so businesses there should check local rules.

The 0% VAT rate on energy-saving materials applies only to residential accommodation and buildings used solely for charitable purposes, until 31 March 2027. Commercial solar installations are charged VAT at the standard 20% rate, although most VAT-registered businesses can recover it through their normal VAT return. Partially exempt organisations may not recover it in full.

Grant funding for commercial solar exists in some regions and sectors but is not universally available. See EvoEnergy’s guides to capital allowances for solar and government grants for solar panels for detail.

3. Protection from energy price volatility

Once a solar system is paid for, the electricity it produces has no fuel cost, so the self-generated share of a site’s demand is shielded from wholesale price swings. Grid electricity prices for businesses move with gas prices, network charges and policy costs. DESNZ data shows UK non-domestic electricity prices peaked in late 2023 and remain far above pre-2021 levels, while its September 2026 Quarterly Energy Prices release links recent oil price rises to conflict in the Middle East.

Solar does not fix the whole energy bill. Standing charges, network charges and any electricity still imported from the grid remain exposed to the market.

4. Lower Scope 2 carbon emissions

Electricity generated and used on site from solar PV reduces a business’s Scope 2 emissions from purchased electricity. This supports corporate net zero targets, Streamlined Energy and Carbon Reporting (SECR) disclosures and supply-chain carbon requests.

The scale of reported savings depends on the grid conversion factor used. DESNZ’s 2026 greenhouse gas conversion factors cut the UK electricity factor by around 26% compared with 2025, reflecting grid decarbonisation and a methodology change. Each solar kWh therefore offsets less reported carbon than it did a year earlier, although the absolute benefit of displacing grid electricity remains.

EvoEnergy’s Aldi Bardon project, an 8.06MWp rooftop system, is forecast to save approximately 1,402,474kg of CO₂ each year.

5. A renewable resource with no fuel cost

Solar energy is renewable and does not deplete natural resources during operation. Unlike coal, oil or gas, sunlight requires no extraction, transport or fuel supply contract, which removes fuel supply risk from the electricity the system produces. The UK government’s Solar Roadmap, published by DESNZ in June 2025, targets 45 to 47GW of installed solar capacity by 2030 as part of its Clean Power 2030 ambition.

6. Less reliance on the national grid

Generating electricity on site reduces the volume a business must import from the grid and buy from suppliers. This lowers exposure to supplier price rises and helps sites where demand is growing, for example through electrification of heating, vehicles or processes. UK solar deployment has accelerated: provisional DESNZ data reported by Solar Power Portal shows around 23.2GW of cumulative UK solar capacity across 2.13 million installations by the end of August 2026.

7. Greater resilience when paired with battery storage

Solar paired with a correctly designed battery energy storage system (BESS) can keep critical loads running during a grid outage, but a standard grid-tied solar system cannot. Grid-connected inverters are required to disconnect when the grid fails, to protect network engineers. Backup capability needs a system specifically designed to island critical circuits.

Commercial battery storage also stores surplus daytime solar for use in the evening or during peak-price periods, raising the share of generation a site uses itself.

8. Stronger ESG credentials with customers, investors and supply chains

Visible onsite renewable generation gives a business measurable evidence of climate action. Customers, investors, lenders and large corporate buyers increasingly ask suppliers for emissions data and reduction plans. Solar provides metered generation figures and carbon savings that can be reported credibly, rather than relying solely on green tariffs or offsets.

9. Scalable, modular systems that use idle space

Solar PV is modular, so systems can be sized to current demand and extended as needs grow. It also turns otherwise unproductive space into an energy asset: warehouse and factory roofs via commercial rooftop solar, car parks via solar carports, and spare land via ground-mounted solar. The DESNZ Solar Roadmap cites UK Warehousing Association research suggesting the largest 20% of UK warehouses could host around 15GW of rooftop solar.

10. Integration with battery storage, EV charging and energy management

Solar works as a foundation technology that other low-carbon systems build on. Pairing solar with battery storage, EV charging infrastructure and smart grid energy management lets a site charge fleet vehicles from its own generation, shift energy use to cheaper periods and control imports and exports in real time.

At Howdens’ manufacturing site in Goole, EvoEnergy connected a 2.965MWp rooftop system into the site’s HV ring so generation could be shared across the campus, and modelled 15 scenarios using half-hourly data to plan future battery storage alongside a planned move away from combined heat and power (CHP). Read the Howdens case study.

disadvantages of solar energy for UK businesses?

Solar PV is a long-term capital project with physical, technical and regulatory constraints. The ten disadvantages below are the issues EvoEnergy most often sees affecting feasibility, cost or timelines. Most can be reduced with good design and early planning.

1. High upfront investment

Commercial solar PV in the UK typically costs between £700 and £900 per kWp installed, according to EvoEnergy’s 2026 project guidance. That puts a 100kWp system at roughly £70,000 to £90,000 and a 500kWp system at £350,000 to £450,000, with larger systems often falling below £700 per kWp. Costs rise where roofs need reinforcement, scaffolding is complex or grid upgrades are needed.

Businesses without capital budget can use alternatives: a solar power purchase agreement (PPA) requires no upfront capital, while lease to own and green loans spread the cost. Upfront cost is real, but tax relief and finance options mean it does not have to block a viable project.

2. Battery storage adds significant cost

Adding battery storage increases project cost considerably and does not always pay back on its own. A battery earns its keep by storing surplus solar that would otherwise be exported cheaply or curtailed, and by shifting imports away from peak-price periods. Sites that already use almost all their solar generation during the day may gain little from storage.

Model battery storage using half-hourly consumption data before committing. It suits sites with large daytime surpluses, evening demand, export limits or resilience needs.

3. Roof or land space is required

Solar output is limited by the usable area available. Shading from plant, parapets, neighbouring buildings or trees, roof obstructions and safe access zones all reduce usable area. Dense urban sites and small units may not have enough space to cover a meaningful share of their demand.

If roof space is limited, carports or ground mounts may add capacity. A site survey confirms what is realistically achievable.

4. Roof condition, structure and lease constraints

Not every commercial roof can carry a solar array, and an array outlasts many roof coverings. Older buildings may need structural reinforcement. A roof membrane or sheet with only a few years of life left should be replaced before installation, because removing and refitting an array later is costly.

Leaseholders also need written landlord consent, and lease length should cover the payback period. A PPA can help here, because the provider owns the asset.

Commission a structural survey and check lease terms early in a feasibility study, before final design.

5. Lower output in winter and cloudy weather

Solar panels still generate diffuse light, but UK output is much lower in winter than in summer. A well-designed UK commercial system typically produces around 850kWh per kWp per year, varying with location, orientation and shading.

Annual yield is predictable enough to bank on, but businesses should expect most generation between spring and autumn and plan winter supply accordingly. Estimate your site’s output with EvoEnergy’s Solar Output Calculator.

6. No generation at night and lower value for exported power

Solar panels produce nothing after dark, so sites with high evening or overnight demand use less of their own generation. Any surplus generated during quiet periods, such as weekends at an office, is exported at an export tariff that is usually worth considerably less per kWh than the price paid for imported electricity.

Solar suits daytime-heavy loads best. Sites with night-time demand should consider battery storage or shifting flexible loads into daylight hours.

7. Planning and permitted development limits

Most commercial rooftop solar in England can be installed under permitted development, subject to prior approval, but there are exceptions. Since 21 December 2023, the government removed the 1MW capacity cap on non-domestic rooftop solar permitted development in England, and introduced rights for solar canopies on non-domestic off-street car parks. Listed buildings, conservation areas and many ground-mounted schemes still need planning permission. Scotland, Wales and Northern Ireland have their own rules.

Planning is rarely a blocker for rooftop systems in England, but always confirm listed status, conservation area designation and the prior approval route before committing.

8. Grid connection delays and export limits

Grid connection is the most common cause of commercial solar delays. Under the Energy Networks Association’s engineering recommendations, systems above 16A per phase (11.04kW on a three-phase supply) need a G99 application to the local Distribution Network Operator (DNO) before connection. In constrained areas, the DNO may require network reinforcement, impose an export limit or refuse export entirely.

The wider queue is also being reformed. The National Energy System Operator (NESO) is reordering connections under Ofgem-approved reforms, and in October 2026 Ofgem agreed to move the deadline for Gate 2 Phase 1 offers to 31 October 2026.

Engage the DNO early and design for export limitation where needed. A constrained connection does not automatically rule solar out.

9. Maintenance, monitoring and fire safety obligations

Solar PV needs less upkeep than most building services, but it is not maintenance-free. Systems need periodic inspection, electrical testing, cleaning and performance monitoring, and inverters typically need replacing during the system’s life.

Fire safety and insurance matter on commercial roofs. RC62, the Joint Code of Practice published in 2023 by RISCAuthority, the Fire Protection Association, MCS and Solar Energy UK, sets out fire-safe design, installation, operation and maintenance requirements for commercial rooftop PV and is used by insurers. Speak to your building insurer before installation.

Budget for an O&M contract and design to RC62. See how often to schedule commercial solar maintenance, estimate costs with the Maintenance Calculator, or explore EvoEnergy aftercare.

10. Gradual panel degradation

Solar panels lose output slowly over time, at a median rate of about 0.5% per year. This figure comes from a review of nearly 2,000 field-measured degradation rates by the US National Renewable Energy Laboratory (NREL). Many manufacturers warrant around 80% of rated output after 25 years, and systems typically operate for 25 to 30 years or longer.

Degradation is gradual and predictable, so it should be built into financial models rather than treated as a risk of sudden failure.

How much does commercial solar cost in the UK, and what is the payback?

Commercial solar costs around £700 to £900 per kWp installed in 2026, and payback is driven mainly by how much generation the site uses itself. A business that consumes most of its solar output during working hours recovers its investment much faster than one exporting large surpluses.

Compare all options on EvoEnergy’s finance page.

Which businesses are best suited to solar energy?

Solar suits businesses with high daytime electricity demand, large unshaded roofs or land, long-term occupancy and a viable grid connection. Sites that operate seven days a week during daylight hours typically achieve the highest self-consumption and fastest payback.

Strong candidates:

• Factories and manufacturing facilities with daytime process loads
• Cold storage and refrigeration sites with constant cooling demand, which peaks in summer when solar output is highest
• Transport and logistics and distribution centres with large flat roofs
• Retail, schools, hospitals and office buildings with weekday daytime demand

Considerable candidates:

• Sites with mainly evening or overnight demand and no plan for storage
• Heavily shaded roofs, or roofs needing replacement within a few years
• Short leases without landlord support
• Sites in severely constrained grid areas where neither export nor import can be accommodated

A considerable candidate is not automatically unsuitable. Battery storage, carports, PPAs and export limitation often make an apparently marginal site viable.

Is solar energy worth it for UK businesses?

For most UK businesses with suitable roof space and daytime demand, solar energy is worth it: the advantages usually outweigh the disadvantages over a 25 to 30 year system life. With average business electricity at 24.51p per kWh (DESNZ, Q2 2026), full tax relief available through the Annual Investment Allowance, and an England business rates exemption until 2035, the financial case is stronger than in previous years.

The answer depends on site-specific factors: how much generation the business can use itself, roof condition, lease terms, grid capacity and how the project is funded. A professional feasibility study, using half-hourly consumption data, a structural survey and early DNO engagement, is the most reliable way to confirm payback before committing.

EvoEnergy designs, installs and maintains commercial solar PV, battery storage and EV charging systems for UK businesses, from single sites to multi-megawatt installations. Explore EvoEnergy’s commercial solar installation service or the feasibility and consultancy process.

Not sure what solar will deliver for your site?

Estimate your site’s generation with EvoEnergy’s free Solar Output Calculator and forecast servicing costs with the Maintenance Calculator. For a site-specific assessment covering roof condition, grid capacity, self-consumption and finance options, make an enquiry with EvoEnergy.

Frequently Asked Questions

How much do commercial solar panels cost in the UK in 2026?

Commercial solar PV costs around £700 to £900 per kWp installed in 2026, based on EvoEnergy’s project guidance. A 100kWp system costs roughly £70,000 to £90,000, and very large systems above 1MWp can fall below £700 per kWp. Roof reinforcement, complex access or grid upgrades can increase costs.

How much electricity does a commercial solar system generate in the UK?

A well-designed UK commercial system generates around 850kWh per kWp per year, so a 100kWp system produces roughly 85,000kWh annually. Output varies with location, roof orientation and shading. EvoEnergy’s Aldi Bardon and Howdens systems are forecast to produce about 840 and 820kWh per kWp respectively.

What is the payback period for commercial solar panels?

Payback typically ranges from around 4 to 12 years, depending mainly on how much generation the business uses on site. In a simple 100kWp illustration at 24.51p per kWh, payback ranges from 4.3 years at 90% self-consumption to 7.7 years at 50%, before tax relief, O&M and inverter replacement are included.

Can businesses claim tax relief on solar panels?

Yes. Solar panels qualify as special rate plant and machinery. Businesses can claim the Annual Investment Allowance at 100% on up to £1m of qualifying spend per year, companies can claim a 50% first-year allowance on new assets, and any remaining balance attracts a 6% writing down allowance.

Do businesses pay VAT on solar panels?

Yes. Commercial solar installations are charged VAT at the standard 20% rate. The 0% VAT relief on energy-saving materials applies only to residential accommodation and buildings used solely for charitable purposes, until 31 March 2027. Most VAT-registered businesses can recover the VAT through their normal VAT return.

Do I need planning permission for commercial rooftop solar?

Usually not in England. Most non-domestic rooftop solar can be installed under permitted development with prior approval, and the previous 1MW capacity cap was removed on 21 December 2023. Listed buildings, conservation areas and many ground-mounted schemes still need planning permission, and rules differ in Scotland, Wales and Northern Ireland.

Do commercial solar panels work during a power cut?

Not by default. Grid-connected solar inverters must shut down when the grid fails, to protect people working on the network. A business needs a battery storage system specifically designed for backup, or a microgrid control system, to keep critical loads running during an outage.

How long do commercial solar panels last?

Commercial solar panels typically last 25 to 30 years or more. They lose output at a median rate of about 0.5% per year, according to NREL research, and many manufacturers warrant around 80% of rated output after 25 years. Inverters usually need replacing at least once during the system’s life.