Commercial Solar PV for Scottish Businesses — Designed, Funded and Delivered
Professionally designed, fully funded and installed to commercial electrical standards — systems from 50kW to multi-megawatt scale across Scotland and the wider UK.
Commercial solar PV in Scotland is no longer a marginal investment. With electricity prices remaining significantly elevated and grid reliability under increasing pressure, businesses with suitable rooftops are generating free electricity, cutting operating costs and reducing their exposure to energy market volatility — often with no capital outlay required.
Caledonia Solar focuses exclusively on commercial solar PV installations across Scotland and the wider UK, working with businesses from 50kW single-site systems through to multi-megawatt portfolios. We manage the entire process in-house — survey, design, funding, grid connection and installation — so you deal with one company from first conversation to final commissioning.
We operate at the point where project structure, funding and grid connection determine whether a system proceeds — not whether panels can be installed.
The numbers behind commercial solar in Scotland
98%
Rise in UK commercial electricity prices since 2021. Energy is now one of the largest controllable costs on most business P&Ls.
25+ years
Operational lifespan of a commercial solar PV system with minimal maintenance. The generation profile is predictable from day one.
50kW–1MW+
Typical system range for commercial and industrial buildings in Scotland. Roof size and energy demand determine the right specification.
For most commercial buildings, the financial case for solar is now straightforward. A properly specified system matched to your energy consumption profile generates electricity at a cost significantly below your current grid tariff — and does so for decades, not years.
The question is not whether commercial solar PV makes financial sense. For most Scottish businesses with suitable rooftops, it does. The question is how to structure the project correctly — the right system size, the right funding model, and a delivery team with the accreditations and grid connection experience to get it built on time.
For most businesses, the constraint is no longer viability — it is execution.
From survey to generation — how a commercial solar installation works in Scotland
STEP 1: ROOF AND SITE SURVEY
We assess your roof structure, orientation, shading, available area and load-bearing capacity. For industrial and warehouse buildings, most flat roofs above 500m² are suitable. We also review 12 months of energy consumption data to size the system accurately against your actual demand profile rather than simply maximising panel count.
STEP 2: SYSTEM DESIGN AND SPECIFICATION
Our design team produces a full system specification including panel layout, inverter configuration, string sizing and performance modelling. We use industry-standard simulation tools to project annual generation, self-consumption rate and financial return under your specific site conditions and energy tariff.
STEP 3: FUNDING STRUCTURE
We present your funding options — CapEx purchase, asset finance or Power Purchase Agreement — with a clear financial comparison for your specific situation. Where multiple options are viable, we model the cash flow implications of each over a 10 and 25-year horizon. We then manage the finance application on your behalf through our panel of five specialist funders.
STEP 4: GRID CONNECTION APPLICATION (G99)
Commercial systems above 16A per phase require a G99 application to your Distribution Network Operator — SP Energy Networks across most of central and southern Scotland, SSEN in the north and Highlands. We prepare and submit the full technical application, manage the DNO review process and handle any required protection relay settings. This stage typically takes 6–12 weeks and is often the critical path item in the project timeline.
STEP 5: PROFESSIONAL INSTALLATION
Installation is carried out by Smart Living Energy, our accredited installation partner, holding full NICEIC and NAPIT commercial electrical registration. All work is carried out in compliance with BS 7671 wiring regulations, with full RAMS documentation and CDM compliance for notifiable projects. A typical commercial installation takes 2–5 days depending on system size.
STEP 6: COMMISSIONING, MONITORING AND HANDOVER
On completion, the system is commissioned, tested and connected. We configure your generation monitoring platform, provide a full handover pack including as-built drawings, test certificates and O&M documentation, and remain your point of contact for any post-installation queries. Your system is generating from day one.
What size commercial solar system does your building need?
SIZE BAND 1: 50KW – 100KW
Typical building: Small commercial unit, retail premises, office building or small warehouse. Roof area required: approximately 350–700m². Annual generation: 45,000–90,000 kWh. Typical project value: £40,000–£80,000. Best suited to businesses with energy bills of £1,500–£3,000 per month.
SIZE BAND 2: 100KW – 500KW
Typical building: Industrial unit, warehouse, manufacturing facility, logistics shed or cold store. Roof area required: 700m²–3,500m². Annual generation: 90,000–450,000 kWh. Typical project value: £80,000–£380,000. The most common project range for Scottish commercial and industrial clients.
SIZE BAND 3: 500KW – MULTI-MW
Typical building: Large distribution centre, multi-bay industrial estate, manufacturing campus or commercial property portfolio. Roof area required: 3,500m²+. Annual generation: 450,000 kWh+. Typical project value: £380,000–£3m+. These projects typically involve phased installation, dedicated DNO liaison and multi-party funding structures. Caledonia Solar manages the full project lifecycle at this scale.
Three ways to fund your commercial solar PV installation
For many businesses, the funding structure is more important than the system itself.
There is no single correct funding model for commercial solar. The right structure depends on your business’s tax position, cashflow requirements, appetite for asset ownership and occupancy plans for the building. Caledonia Solar presents all three options and makes a clear recommendation based on your specific situation.
CapEx purchase — own the asset outright, maximise financial return, benefit from capital allowances and the Energy Security Investment Mechanism.
Asset finance — spread the installation cost over 3–7 years. Fixed monthly payments, typically cash-flow positive from day one as savings exceed finance costs.
Power Purchase Agreement (PPA) — zero capital outlay. A third-party funder owns and installs the system. You pay for the electricity generated at a rate below your grid tariff.
Full comparison of all funding routes → /solutions/funding-options
What makes Caledonia Solar different from a general electrical contractor adding solar to their offer
Commercial-only focus. We do not do residential solar. Every project we take on is a commercial or industrial installation between 50kW and multi-MW. That focus means our design process, funding relationships and installation standards are built entirely around the complexity of commercial projects.
In-house funding capability. We have established relationships with five specialist commercial solar funders — Octopus Energy, Siemens Financial Services, Ortus Energy (part of SSE) and Soventix. We place funding directly, without introducing a finance broker into the chain.
Accredited installation partner. Physical installation is carried out by Smart Living Energy, NICEIC and NAPIT registered for commercial electrical work, with full CDM and RAMS capability for notifiable projects. The same team that designs the project supervises the installation.
G99 experience. Grid connection for commercial systems is the most common source of delay on Scottish solar projects. We have direct experience of the G99 application process with both SP Energy Networks and SSEN, and we manage this process on your behalf from submission through to energisation.
Scottish planning and regulatory knowledge. We understand the May 2024 permitted development reforms that removed the 50kWp cap for commercial rooftop solar in Scotland, local planning authority requirements across Scottish councils, and the grant landscape specific to Scottish businesses.
Commercial solar PV across every sector
Every industry has a different energy profile and a different set of financial priorities. Select your sector to see how commercial solar works specifically for your type of business.
Frequently asked questions
How much does a commercial solar PV system cost in Scotland?
A commercial solar PV installation in Scotland typically costs between £700 and £900 per installed kilowatt peak (kWp) depending on system size, roof type and complexity. A 100kW system therefore typically costs £70,000–£90,000 before funding. Actual cost depends on roof type, access requirements, grid connection scope and project scale. A full design and financial model is provided before any commitment. Asset finance and PPA structures are available that require no upfront capital outlay.
What roof types are suitable for commercial solar in Scotland?
Most commercial flat roofs and low-pitch roofs are suitable for solar PV. Flat roofs with membrane or built-up felt coverings can use ballasted mounting systems that require no roof penetrations. Trapezoidal metal roofs are among the easiest and most cost-effective to work with. Structural capacity is assessed during the initial survey. Scottish weather conditions, including higher wind loads in exposed locations, are factored into the structural design.
Does commercial solar work in Scotland given the climate?
Yes. Commercial solar PV in Scotland generates approximately 800–1,000 kWh per installed kWp per year — lower than the south of England but well within the range that makes commercial installations financially viable. The financial case is driven by the gap between your electricity purchase cost and the cost of solar generation, not by raw irradiance. With UK commercial electricity prices remaining elevated, Scottish installations consistently deliver strong returns.
How long does a commercial solar installation take in Scotland?
From initial survey to grid connection and commissioning, a typical commercial solar project in Scotland takes 12–20 weeks. The main variable is the G99 grid connection process with SP Energy Networks or SSEN, which typically takes 6–12 weeks from submission. Caledonia Solar manages the G99 application on your behalf and tracks the DNO review throughout. Physical installation typically takes 2–5 days.
What grants are available for commercial solar in Scotland?
Scottish businesses can access support through several programmes including the Resource Efficient Scotland advice service and sector-specific capital grant schemes. The availability and terms of grant funding change regularly. Caledonia Solar reviews current grant eligibility as part of every initial consultation and factors available funding into the project financial model.
Do I need planning permission for commercial solar in Scotland?
In most cases, commercial rooftop solar installations in Scotland benefit from permitted development rights and do not require a full planning application. Scotland removed the 50kWp cap on commercial rooftop permitted development in May 2024, meaning larger systems can now be installed without planning permission subject to specific conditions including height limits and proximity to listed buildings or conservation areas. Caledonia Solar confirms permitted development eligibility as part of the initial assessment.
What is G99 and why does it matter for commercial solar?
G99 is the technical standard governing the connection of generation equipment — including solar PV — to the UK distribution network. Commercial systems above 16A per phase require a formal G99 application to the local Distribution Network Operator before connection. In Scotland, this means SP Energy Networks for central and southern areas, or Scottish and Southern Electricity Networks (SSEN) for the north and Highlands. The G99 process includes technical review, protection relay requirements and formal approval. Caledonia Solar manages the full G99 application process on behalf of every client.
See what commercial solar is worth to your business
Enter your roof size, monthly energy bill and preferred funding model. Our calculator returns an indicative annual saving, payback period and 25-year return — in under 60 seconds. Get a Free Savings Estimate