How Much Does a Commercial Solar Lease Cost Per Month in 2026?
By the Commercial Solar Finance editorial team — independent advisers (no installer or lender commissions). Published June 2026.
How much does a commercial solar lease cost per month? The honest answer is "it depends on system size and term" — so here are the actual monthly figures for common commercial system sizes in 2026, what is included, and how the monthly compares with the energy saving it unlocks.
Commercial solar lease cost per month by system size, 2026
Indicative monthly rentals for a commercial solar lease (operating or finance lease) at typical 2026 rates over a 7–10 year term:
| System size | Approx. install value | Indicative monthly lease | Typical monthly energy saving |
|---|---|---|---|
| 30kWp | £33,000 | £430–£520 | £700–£950 |
| 50kWp | £55,000 | £700–£860 | £1,200–£1,600 |
| 100kWp | £97,500 | £1,250–£1,520 | £2,200–£3,000 |
| 250kWp | £212,500 | £2,700–£3,300 | £5,500–£7,000 |
Indicative 2026 figures over a 7–10 year term; actual rental depends on covenant, term and rate. The point: on most sites the monthly saving exceeds the monthly rental, so the lease is cash-flow positive from early on. See full detail on commercial solar lease costs.
What is included in a commercial solar lease rental
A commercial solar lease rental covers the use of the system for the term. Whether maintenance, monitoring and insurance are bundled depends on the lessor — an operating lease often includes them (one of its attractions), a finance lease usually does not. Always confirm what the monthly buys: a slightly higher rental that includes full O&M and a performance guarantee can be cheaper in practice than a bare rental plus separate service contracts.
Lease vs own: the monthly is only half the story
A lease keeps the monthly predictable and the system off your balance sheet (operating lease, under FRS 102), but the lessor claims the capital allowances — worth 25% of the system cost. If your business is profitable, owning via a green loan often beats leasing once that tax relief is counted, even though the monthly repayment is similar. If you value simplicity, fixed cost and no balance-sheet impact, the lease wins. Model both before deciding — the right answer depends on your tax position.
What moves the monthly lease figure most
Three variables drive the rental more than anything else. Term: stretching a lease from 7 to 10 years lowers the monthly but raises the total paid. Covenant: a strong balance sheet secures a keener rate, because the lessor is financing against your creditworthiness for the full term. And what is bundled: a rental that includes maintenance, monitoring, insurance and a performance guarantee will read higher than a bare finance lease, but it removes separate service costs and risk — so compare like with like.
The figure that actually matters is not the rental in isolation but the rental set against the energy saving it unlocks. On a well-sized system with good daytime self-consumption, the monthly saving comfortably exceeds the monthly rental from year one, so the lease is cash-flow positive while you pay nothing upfront. Where self-consumption is low — a weekday-only site with weekend generation going to export — the margin is thinner and the sizing matters more.
Before committing to a lease, it is worth modelling the same system as a green loan purchase. For a profitable business the loan route often wins on lifetime cost because you keep the Annual Investment Allowance, even when the monthly is similar. The full comparison is on our commercial solar lease page.
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