Commercial Solar Panels UK: A Business Owner's Complete

Commercial Solar Panels UK: A Business Owner's Complete Guide (2026)

The Commercial Solar Opportunity in 2026

Commercial solar has moved from niche to mainstream. DESNZ's Quarterly Energy Prices release of 29 September 2026 puts the average non-domestic electricity price at 24.51p per kWh including the Climate Change Levy in Q2 2026, up 2.0% on the year, with manufacturing paying 17.4p per kWh excluding CCL. How much of that a rooftop array displaces depends on how much of your demand falls in daylight hours, which is what a half-hourly data analysis is for.

UK businesses installed a record volume of commercial solar in 2025, driven by falling panel prices, improved battery storage technology, and growing pressure from supply chain customers to demonstrate ESG credentials. For the delivery side, our commercial solar installers page covers surveys, grid applications and metering. For any business with a roof and a meaningful daytime electricity load, the question is no longer whether to go solar but when and how.

Who Is Commercial Solar Right For?

Commercial solar delivers the strongest results for businesses with:

High daytime energy consumption (manufacturing, food production, logistics)
Large south or west-facing roof areas (warehouses, factories, retail parks)
Long property tenancies (5+ years preferred for owned or long-lease properties)
Pressure to reduce Scope 2 carbon emissions for ESG reporting
Access to capital for the upfront investment

Industries with particularly strong solar ROI include:

Manufacturing and engineering
Cold storage and food processing
Agriculture and horticulture
Retail warehousing and logistics
Schools, universities, and NHS trusts
Hotels and hospitality

Commercial System Sizes and Costs

Costs and savings vary too much by roof, access, connection and consumption pattern to publish a table that would mean anything for your site: ask for a quotation built on your own half-hourly data.

Payback depends on what you pay for grid electricity, how much of the generation you use on site and what the installation costs, so it is worked out per site rather than quoted as a range.

DNO Applications: What You Need to Know

All commercial solar installations in Great Britain require engagement with the local Distribution Network Operator (DNO):

Which operator that is cannot be assumed from the county. Most of our coverage sits with UK Power Networks, but commercial solar in Milton Keynes goes to National Grid Electricity Distribution instead, with its own portal and timescales — worth settling before a programme is written.

G98 (generation up to and including 16 A per phase, i.e. 3.68 kW single-phase or 11.04 kW three-phase): notification to the network operator within 28 days after commissioning
G99 (anything above 16 A per phase): a formal application before installation. The network operator works to the published Significant Grid Impact assessment routes rather than a fixed number of days, and where distribution reinforcement is needed the cost risk sits with the generator

Commercial installers with experience of G99 applications will manage this process on your behalf. Systems requiring distribution reinforcement can face additional costs and longer lead times — a specialist installer will identify this risk early through a desk-based feasibility study.

Tax and Incentive Landscape (2026)

Capital allowances: Solar panels are special rate plant and machinery (HMRC CA22335), so Full Expensing does not apply. A company can claim the 50% special rate first-year allowance instead, and any business can claim the Annual Investment Allowance on up to £1m a year of qualifying spend, including special rate expenditure (HMRC CA23084).
Business rates (England): Plant and machinery used to generate or store power from solar is not counted towards a property's rateable value for any day before 1 April 2035 (SI 2022/405).
VAT: The 0% rate on energy-saving materials (VAT Notice 708/6) covers residential accommodation and buildings used solely for a relevant charitable purpose, until 31 March 2027. Solar on business premises is standard-rated at 20%, which a VAT-registered business can normally recover.

Battery Storage for Commercial Properties

Large-scale battery storage adds significant value to commercial solar:

Demand management: Reduce peak demand charges from network operators
Time-of-use arbitrage: Charge at cheap overnight rates, discharge at peak
Backup power: Protection against grid outages
Enhanced SEG / export revenue: Export at peak price periods

Systems from 30kWh to 5MWh+ are available for commercial applications. BESS (Battery Energy Storage Systems) projects are increasingly eligible for grid services payments.

Choosing a Commercial Solar Installer

SOLA UK designs and installs commercial solar systems for businesses across Hertfordshire, North London and the Buckinghamshire fringe, from half-hourly energy data analysis and system design through the G99 grid application to project-managed installation. Whoever you choose, check the points below before you sign.

When procuring a commercial solar installation, businesses should ensure:

1. The installer is certified for the work in hand: MCS certification (MIS 3002) covers installations up to 50 kWp, so above that size ask which standard the design is built to and who signs it off

2. A fully engineered design is provided with yield calculations based on actual roof orientation and shading analysis

3. G99 DNO application is included in scope

4. Planning applications are managed where required

5. A clear O&M (operations and maintenance) agreement is proposed

Frequently Asked Questions

Do I need planning permission for a commercial solar installation?

Rooftop solar on a non-domestic building can be permitted development, and the old 1 MW cap was removed by article 6 of S.I. 2023/1279 on 21 December 2023. Above the microgeneration threshold, Class J still carries a prior-approval determination, so confirm the position with your local planning authority before you design to it. Planning permission is typically required for ground-mounted systems, heritage buildings, or installations in sensitive areas.

What is the carbon reduction from a 100kW commercial system?

Approximately 20–25 tonnes of CO2 per year based on current UK grid emissions factors. Over 25 years, this represents 500–625 tonnes of avoided emissions.

Can we install solar if we rent our premises?

Yes, with landlord consent. Many commercial landlords now actively encourage solar as it enhances EPC ratings and supports tenant ESG commitments.

Commercial Solar Panels UK: A Business Owner's Complete Guide (2026)