Free tool

Commercial solar savings calculator

See what your business could save with solar and a Power Purchase Agreement — no sign-up, no obligation. Enter your annual electricity spend to get an instant, indicative estimate.

This free calculator gives UK businesses an indicative estimate of what commercial solar could save through a Power Purchase Agreement (PPA). Enter your annual electricity spend to see estimated annual and 20-year savings, CO₂ avoided and the rough system size — from transparent, adjustable assumptions. It is a guide, not a quote.

Your details

Every assumption is shown and adjustable — change them to match your business.

Annual electricity spend

Roughly what your business pays for electricity a year. Your current electricity rate 25p / kWh Typical UK business rates are around 22–28p. Adjust to your bill. (Only affects the CO₂ and system-size figures, not the saving.) Share of your electricity solar could supply 40% Depends on your roof and how much power you use in daylight. 30–50% is typical for a well-sized commercial system. PPA saving vs your grid rate 30% A PPA is guaranteed at least 30% below the grid. We use 30% as a conservative default.

Your indicative estimate

Estimated saving / year

£—

Over the ~20-year term

£—

CO₂ avoided / year

— t

Indicative system size

— kWp

Get my exact figures — free proposal

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How this is worked out

Annual saving = your spend × the share solar supplies × the PPA saving vs the grid.
The 20-year figure is the annual saving × 20 — it ignores likely grid price rises, so real savings are usually higher.
CO₂ uses the UK Government grid factor of 0.207 kg CO₂e per kWh; system size assumes ~950 kWh generated per kWp a year in the UK.

This is an indicative estimate, not a quote. Your actual savings depend on your roof, usage pattern, system size and tariff. Get a free, site-specific proposal →

Turn the estimate into real numbers

The calculator shows the shape of the opportunity. The exact figures come from a free energy assessment — we look at your half-hourly usage, roof and site to design a system and quote a fixed PPA rate. To go deeper first, read how much a business can save with solar, compare a PPA vs buying outright, or see the full funding options.

Common questions

Calculator questions

How accurate is the solar savings calculator?

It gives an indicative estimate, not a quote. Your real savings depend on your roof, your electricity use through the day, the system size and your tariff. The calculator uses transparent, conservative assumptions you can adjust — for exact figures, request a free site-specific proposal.

How does a solar PPA save money?

Under a Power Purchase Agreement you pay nothing upfront and buy the solar electricity your system generates at a fixed rate guaranteed at least 30% below your grid price. You save on every unit of solar power you use on site, and the system is fully funded and maintained for you.

What electricity spend makes commercial solar worthwhile?

There is no hard threshold, but the more electricity you use during daylight hours, the more solar you use on site and the greater the saving. Businesses with a large daytime load — manufacturing, warehousing, cold storage, agriculture — tend to see the strongest returns.

Is the calculator free and is there any obligation?

Yes, the calculator is completely free and requires no sign-up. If you want exact, site-specific figures we can prepare a free, no-obligation proposal — but you are under no obligation to use the tool or to proceed.

See what the sun owes you

Get a free, no-obligation PPA proposal — a tailored system design and a fixed rate at least 30% below your current supplier.

Get my free quote Call 01743 649 888

£0 upfront cost
·
Rates 30%+ below the grid
·
Fully funded & maintained
·
No obligation