A commercial solar project should start with your half-hourly electricity data, not a panel count. The right system can reduce purchased electricity, support carbon targets and make better use of an underused roof or car park. This commercial solar feasibility guide explains what a UK business should assess before committing budget, so the proposed system is designed around real demand rather than a generic estimate.
What commercial solar feasibility really means
Feasibility is the process of deciding whether solar PV is technically suitable, financially worthwhile and practical for a particular site. It is not simply a question of whether a roof faces south. A well-designed commercial system must work with the building, the electricity supply, operating hours, future plans and the way the business uses power.
For many organisations, the strongest case for solar comes from using generation on site. Electricity used directly by the business avoids buying that power from the grid at the prevailing tariff. Exporting surplus energy can still provide value, but it is usually less valuable than self-consumption. That is why a warehouse operating through the day, a school with daytime demand or a manufacturing site with steady electrical loads may be well suited to solar.
The answer is not always a straightforward yes. A large roof may have limited value if the building is mostly empty during daylight hours. Equally, a smaller system with a high proportion of on-site use can perform better commercially than an oversized array that exports heavily. A proper feasibility review identifies that balance early.
Start with how your business uses electricity
Annual consumption is useful, but it does not tell the full story. Two businesses using the same number of kilowatt-hours each year can have very different solar opportunities. One may consume electricity steadily from 8am to 6pm, while the other may use most of its energy overnight.
A feasibility assessment should review at least 12 months of bills and, where available, half-hourly consumption data. This shows when demand occurs, how much electricity is used during solar-producing hours and whether there are seasonal changes. It can also reveal expensive peaks, a rising baseload or equipment that is using more power than expected.
Consider what may change over the next few years. New machinery, expanded office space, refrigeration, air conditioning, heat pumps and electric vehicle charging can all alter the demand profile. Installing solar around current use alone may leave a site undersized shortly after commissioning. On the other hand, planning for future demand without firm timescales can create unnecessary export from day one.
The best approach is to model realistic scenarios. This may include current demand, anticipated growth and the effect of battery storage or EV charging. Honest assumptions produce a more useful business case than optimistic generation or tariff figures.
Assess the roof, land or car park
The available installation area must be surveyed properly. Roof age, construction, orientation, pitch, shading and access all affect the design, cost and long-term performance of a solar array.
A south-facing roof often delivers the highest annual generation per panel, but east-west arrays can be a sensible commercial choice. They produce more evenly across the morning and afternoon, which may match a business’s working day more closely. The ideal layout depends on the building and its demand profile, not a single rule of thumb.
Shading deserves close attention. Nearby buildings, trees, rooflights, plant rooms, parapets and ventilation equipment can reduce output at certain times of day. Modern system design can manage some shading, but it should never be ignored in projections. A site survey should also check for safe maintenance access, cable routes, fire considerations and room for inverter equipment.
Structural capacity is equally important. Panels, mounting equipment, wind loading and maintenance requirements all need to be considered by an appropriately qualified professional. If the roof is nearing the end of its life, re-roofing before installation may be the more sensible decision. Removing and reinstalling a large solar system later is disruptive and adds cost.
Where roof space is unsuitable or limited, ground-mounted solar and solar carports may be options. These can work well for sites with available land or staff parking, although planning, civil works, drainage, security and vehicle movements need careful consideration.
Check the electrical infrastructure early
A solar system connects to your existing electrical infrastructure, so the supply arrangement matters as much as the panels themselves. The feasibility process should identify the main incoming supply, distribution boards, available capacity, metering arrangement and likely connection requirements.
Larger systems may require an application to the local Distribution Network Operator before installation. The DNO will assess whether the network can accept the proposed generation and may set an export limit or require network upgrades. This process can influence system size, programme and cost, so it should be allowed for at the start rather than treated as an afterthought.
Export limitation can still allow a worthwhile project. Controls can restrict the amount of power exported while allowing the business to use generation on site. Battery storage may also help retain more solar energy for later use, particularly where late-day demand is high. However, a battery is not automatically the right answer. Its value depends on the price difference between imported and exported electricity, the site’s load profile, anticipated cycling and the operational objectives of the business.
A competent contractor will also consider protection settings, isolation, monitoring, emergency shut-down arrangements and compliance with current UK standards. This is where an end-to-end electrical and solar team adds real value: the system is designed as part of the building’s electrical installation, not treated as a separate add-on.
Build a business case that reflects reality
Financial feasibility should be clear enough for directors, finance teams and property managers to challenge the assumptions. A proposal should show expected generation, estimated self-consumption, likely export, installation costs, ongoing maintenance allowances and projected savings over time.
The figures will depend on several moving parts:
- current and expected electricity tariffs
- the proportion of solar power used on site
- export rates and any agreed export limit
- system size, roof complexity and connection work
- funding method, tax treatment and capital priorities
- anticipated changes to the building or business operations
Payback periods are useful, but they should not be the only measure. Solar is a long-term asset. Businesses may also value lower exposure to daytime electricity prices, progress towards environmental commitments, improved energy reporting and a more resilient energy strategy when solar is paired with storage or other efficiency measures.
Be cautious with projections that assume every generated unit offsets the most expensive imported electricity. Likewise, do not dismiss a project solely because the headline payback is not exceptionally short. The right question is whether the system supports the organisation’s financial and operational plans over its expected working life.
Plan permissions, ownership and procurement
Before work begins, establish who has authority over the building and roof. Tenants may need landlord consent, and lease terms can affect responsibility for maintenance, insurance and the value of generated electricity. For multi-let buildings, the metering and benefit-sharing arrangements need to be agreed clearly.
Planning requirements vary by site. Many commercial installations can proceed without a full planning application, but listed buildings, conservation areas, ground-mounted arrays, carports and unusual sites may need additional checks. Building regulations, fire strategy requirements and insurer expectations can also affect the final design.
Procurement should focus on capability rather than the lowest panel price. Ask how the contractor will survey the site, manage the DNO process, coordinate structural or roofing input, protect operations during installation and provide commissioning records. You should also understand the warranties for panels, inverters, mounting systems and workmanship, alongside the monitoring and aftercare available after handover.
For businesses seeking certain incentives, finance arrangements or export payments, recognised certification may be required. Choosing an MCS-certified installer helps ensure that the installation is designed, documented and commissioned to the expected standard.
Turn feasibility into a workable project
Once the technical and financial case is sound, the next stage is a detailed site survey and system design. This should confirm panel layout, generation modelling, cable containment, inverter locations, scaffolding or access equipment, programme, health and safety controls and any disruption to normal operations.
Commercial installation should be planned around the site, not the other way round. A retail unit may need work completed outside trading hours. A school may prefer holiday-period installation. Industrial premises may require permit-to-work procedures, isolation planning and close coordination with facilities teams. Clear communication before work starts prevents avoidable downtime.
Evolve Electrical Contractors can manage commercial solar from initial survey and tailored design through installation, testing, certification and ongoing support. The aim is straightforward: a compliant system that is neat, properly documented and built to deliver measurable value for the way your business actually uses energy.
A good feasibility study does more than approve or reject solar. It gives you the confidence to invest at the right size, on the right site and with a clear view of what the system can realistically achieve.