Solar calculator — 2026 UK pricing
Commercial solar calculator — system size, capex, payback after grants.
Enter your annual electricity spend and sector. The calculator estimates the system size that fits your demand, capex at 2026 UK prices, year-one savings, and post-grant payback. No email required, no obligation. For a properly modelled financial case run against your half-hourly meter data, the free funding review takes the next step.
Recommended size
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Headline capex
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Net cost after support
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Payback
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Year-1 electricity savings
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25-year cumulative savings
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Important caveats. These figures use 2026 UK average benchmarks. Real numbers vary materially with site-specific demand profile, half-hourly self-consumption, DNO connection costs, roof condition and grant-application scoring outcomes. The free funding review models against your actual half-hourly meter data and produces a board-paper-ready financial case.
Free funding review
Want a properly modelled case?
The calculator uses sector averages. The free funding review uses your actual meter data, real installer quotes and live grant windows.
No obligation. We don't charge for grant scoping.