Commercial solar savings calculator
Enter your electricity spend to estimate the system size, maximum annual saving and year-one tax relief for renewable energy for businesses. Indicative only, not a quote.
Indicative estimate
- Indicative system size
- 90 kWp
- Maximum annual saving
- £23,940
- Year-one tax relief (AIA)
- £20,250
- CO₂ saved
- 17.7 t/yr
Assumptions: ~950 kWh per kWp per year (UK average), install cost ~£900 per kWp, exported units at a 5p Smart Export Guarantee rate, Annual Investment Allowance relief at 25% corporation tax. These are illustrative defaults; your figures depend on roof, shading, load profile, tariff and tax position. This tool does not store any data you enter. The saving shown is a maximum: it assumes every kWh the array generates is used on site, which real sites rarely achieve, so real savings are lower and real paybacks longer. Payback and lifetime saving are therefore not shown.
Calculator FAQs
How accurate is this calculator?
It gives an indicative estimate from standard UK assumptions: roughly 950 kWh generated per kWp per year, a commercial install cost near £900 per kWp, and a 5p Smart Export Guarantee rate for exported units. Your real figures depend on your roof, orientation, shading, load profile and tariff. For a precise figure, model the half-hourly meter data.
What is self-consumption and why does it matter?
Self-consumption is the share of solar you use on site rather than export. On-site use saves the full electricity price, while exported units earn only the lower Smart Export Guarantee rate, so a higher daytime load means a shorter payback. The slider lets you set your daytime usage share.
Does the estimate include tax relief?
Yes. Commercial solar usually qualifies as plant and machinery, so indicative year-one Annual Investment Allowance relief at the 25% corporation tax rate is shown. Your actual eligibility depends on your tax position and profits.
Is this a quote?
No. It is an indicative estimate to help you scope the opportunity. A real proposal needs meter data, a roof assessment and a grid check.