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                        "text": "Commercial solar ROI is the financial return a business receives from installing solar PV. It is usually measured through simple payback, lifetime savings, net present value, internal rate of return, or post-tax return. Simple payback shows how long it takes for electricity savings and export income to recover the installation cost, but a fuller ROI model should also include maintenance, inverter replacement, finance costs, tax treatment, system degradation, and changes in electricity prices."
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                        "text": "The biggest driver is usually how much solar electricity the business can use on site while it is being generated. Self-consumed solar normally replaces imported electricity, which is usually worth more than exported electricity. Other major factors include installation cost, roof condition, system size, electricity tariff, export rate, DNO connection limits, finance structure, maintenance costs, tax treatment, and whether the business expects its electricity use to change."
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                        "text": "Solar PV generates during daylight, with higher output in spring and summer. A business that uses electricity at the same time can reduce imported grid electricity and improve ROI. Sites such as factories, cold stores, leisure centres, food processors, farms, retail units, and seven-day operations often have better solar matching than buildings with low daytime loads or long summer shutdowns."
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                        "text": "Not always. The best financial design is often the system size that maximises valuable self-consumption, not necessarily the largest system that fits on the roof. Oversizing can still make sense if export terms are strong, future electricity demand is expected to grow, or the business has wider carbon reduction goals. However, if most extra generation would be exported at a low rate, a smaller system may produce a better ROI."
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                        "text": "A reliable ROI calculation should estimate annual solar generation, split that generation into electricity used on site and electricity exported, then value each part separately. It should use real demand data where possible, ideally half-hourly electricity data, and should include installed cost, maintenance, inverter replacement, degradation, export income, finance costs, tax assumptions, insurance requirements, and any grid or enabling works. Standing charges should usually not be treated as savings because they often remain after solar is installed."
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                    "name": "Why is half-hourly electricity data important?",
                    "acceptedAnswer": {
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                        "text": "Half-hourly electricity data shows when a business actually uses power, which is essential for estimating how much solar generation will be used on site. Annual consumption alone can be misleading because it does not show weekend closures, seasonal shutdowns, overnight loads, or short demand peaks. For businesses on complex tariffs, half-hourly data also helps value solar against the actual import cost avoided in each period."
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                    "name": "How do complex electricity tariffs affect solar ROI?",
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                        "text": "Complex commercial tariffs can include time-of-use rates, seasonal prices, capacity charges, demand charges, DUoS and TNUoS elements, reactive power charges, and supplier pass-through costs. Solar ROI should be calculated against the avoidable cost in each relevant period rather than a simple blended average rate. Solar may reduce some demand-related costs, but only if generation reliably coincides with the site’s chargeable peaks."
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                    "name": "How much does commercial solar cost in the UK?",
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                        "text": "Commercial solar costs vary by project size and site complexity. Small commercial rooftop systems may cost around £900 to £1,300 per kWp installed, medium systems often sit around £700 to £1,100 per kWp, and larger straightforward commercial or industrial rooftops may fall below £700 to £900 per kWp. Costs can increase where there are roof repairs, asbestos works, structural strengthening, complex access, switchgear upgrades, long cable routes, export limitation, planning conditions, or battery storage."
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                    "name": "How much electricity does commercial solar generate in the UK?",
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                        "text": "A well-designed UK commercial rooftop solar system commonly generates around 800 to 1,100 kWh per kWp per year. Output depends on location, roof orientation, pitch, shading, panel layout, inverter design, soiling, downtime, and maintenance. Sites in southern England often perform towards the higher end of the range, while northern, Scottish, upland, shaded, or less optimally oriented sites may generate less."
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                    "name": "Is exported solar electricity worth the same as electricity used on site?",
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                        "text": "Usually not. Electricity used on site normally avoids the cost of buying power from the grid, including some energy and non-energy elements of the import tariff. Exported electricity is paid separately and is often worth less per kWh than the imported electricity it could have replaced. This is why a solar ROI model should separate self-consumption from export rather than valuing all generation at the same rate."
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                    "name": "Can battery storage improve commercial solar ROI?",
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                        "@type": "Answer",
                        "text": "Battery storage can improve ROI where a business exports low-value solar during the day but imports more expensive electricity later, has strong time-of-use price differences, faces predictable peak demand charges, or has export constraints. However, batteries do not automatically improve returns. A battery should be modelled separately from solar and should include usable capacity, round-trip efficiency, degradation, cycle limits, warranty terms, maintenance, fire safety requirements, and replacement assumptions."
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                    "name": "Will solar and battery storage keep my business running during a power cut?",
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                        "text": "Not automatically. A standard grid-connected solar PV or solar-plus-battery system will usually shut down during a power cut for safety unless it has been specifically designed for backup operation. Resilience requires additional design, protection, isolation, load management, and clear decisions about which circuits or equipment need support. If backup power is part of the business case, it should be specified at the start."
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                        "text": "Many commercial rooftop solar installations in England may fall under permitted development if they meet the relevant conditions, but planning permission may still be required for listed buildings, conservation areas, National Parks, sensitive locations, or designs that exceed permitted limits. Scotland, Wales, and Northern Ireland have different rules. Planning should be checked early because consent requirements can affect cost, timing, design, and ROI."
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                        "text": "Many commercial solar installations need approval from the Distribution Network Operator, especially larger systems or systems that may export electricity to the grid. The DNO may limit export capacity, require protection equipment, request metering changes, or specify reinforcement works. Export limits can materially affect ROI, so grid assumptions should be checked before relying on headline savings."
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                        "text": "A commercial roof should be checked for condition, remaining roof life, structural capacity, wind loading, fragility, asbestos, corrosion, rooflights, shading, access, fire routes, maintenance walkways, and cable routes. If the roof needs replacement soon, solar may create future removal and reinstatement costs. A strong financial case can change quickly if roof repairs, structural strengthening, or access constraints are discovered late."
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                    "name": "How do leases and landlords affect commercial solar ROI?",
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                        "text": "Leases can be critical because the tenant may pay the electricity bill while the landlord owns the roof. Before proceeding, the parties should agree who funds the system, who owns the equipment, who receives savings and export income, who maintains and insures it, how roof access works, and what happens at lease expiry, break clause, assignment, roof repair, property sale, or removal. A short lease can weaken ROI if the tenant may leave before payback."
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                        "text": "No. Commercial solar is usually strongest for owner-occupiers or long-term tenants with high daytime electricity use, a sound roof, predictable operations, and a workable grid connection. It may be less suitable where the roof needs replacement, the structure cannot support the system without expensive works, the business has low daytime demand, export is heavily restricted, the lease is short, or the building is likely to be sold, vacated, redeveloped, or re-roofed."
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                        "text": "A realistic ROI model should include monitoring, inspection, testing, maintenance, cleaning where needed, fault response, insurance requirements, metering costs, inverter replacement, and any finance charges. It should also allow for panel degradation and possible downtime. Excluding these costs can make a payback estimate look better than the true long-term investment case."
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                        "text": "Tax treatment can materially affect post-tax ROI. Capital allowances may apply to qualifying solar PV expenditure depending on the rules at the time and the business structure. VAT, leases, hire purchase, power purchase agreements, and accounting treatment can also change the financial outcome. Businesses should take professional tax advice rather than relying on generic assumptions."
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                        "text": "Compare quotes using the same assumptions for system size, generation, self-consumption, export value, import tariff, maintenance, inverter replacement, finance, tax, grid connection, roof works, and battery storage. A good proposal should show on-site savings separately from export income, explain DNO and planning assumptions, state what is included in the installed cost, and provide sensitivity testing rather than relying only on an optimistic payback figure."
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