Commercial Solar Panel Finance Options
Six ways to finance commercial solar in 2026 — from zero-capital PPA and roof rental to AIA-efficient hire purchase and British Business Bank green loans. No capital? No problem.
You do not need to spend £75,000 upfront to get commercial solar. From zero-capital PPAs and roof rentals to AIA-efficient hire purchase and green loans, there are six distinct ways to finance a commercial solar installation in 2026. This guide explains each option, who it suits, and the tax implications.
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Capital for PPA/Lease
25%
AIA Tax Saving (Cash)
4-8%
Green Loan Rates
Day 1
Savings Start
Commercial Solar Finance Options Compared
| Finance Type | Capital Required | AIA Claim | Ownership | Monthly Cost | Best For |
|---|---|---|---|---|---|
| Cash purchase | Full cost | Yes (you) | You (from install) | None | High CT businesses, max ROI |
| Asset finance / HP | Deposit only | Yes (you) | You (after last payment) | Fixed monthly | Spreading cost, keeping AIA |
| Operating lease | None/small | Finance co. | Finance company | Fixed monthly | Off-balance-sheet preference |
| Solar PPA | None | Finance co. | Finance company | Per kWh generated | Zero capital, loss-making biz |
| Roof rental | None | Finance co. | Finance company | None (you earn rent) | Passive income, no energy savings |
| Green business loan | None | Yes (you) | You (from install) | Loan repayment | Borrowing at competitive rates |
Option 1: Cash Purchase
Best for: Businesses with capital, paying 25% Corporation Tax, wanting maximum long-term returns.
Buying outright is the most financially efficient method over the life of the system. You claim the full Annual Investment Allowance (AIA) — a 25% CT rate business saves £18,750 in year-1 tax on a £75,000 system. Annual savings of £25,000-£30,000 give a 2-3 year net payback. Over 25 years, a £75,000 system generates £500,000+ in savings.
Considerations: Ties up working capital. Not suitable for businesses in a loss position. Opportunity cost if capital can earn better returns elsewhere.
Option 2: Asset Finance and Hire Purchase
Best for: Businesses that want to spread cost over 3-7 years while retaining AIA benefit and eventual ownership.
Asset finance (hire purchase) lets you acquire commercial solar with a deposit (typically 10-20%) and fixed monthly payments. You own the asset at the end of the term. Crucially, you still claim AIA on the full capital cost in year 1 — the tax saving of £18,750 on a £75,000 system can effectively fund 1-2 years of monthly payments.
| System | Gross Cost | Deposit (10%) | Monthly (60 months at 7%) | Year-1 AIA Saving | Effective Year-1 Benefit |
|---|---|---|---|---|---|
| 50kW | £38,000 | £3,800 | £673/mo | £9,500 | +£5,700 net |
| 100kW | £74,000 | £7,400 | £1,311/mo | £18,500 | +£3,500 net |
| 250kW | £178,000 | £17,800 | £3,152/mo | £44,500 | +£6,700 net |
Illustrative rates. Actual rates vary 5-10% depending on credit and lender.
Option 3: Operating Lease
Best for: Businesses that want predictable monthly costs and off-balance-sheet treatment under IFRS 16 (check with your accountant — IFRS 16 brought most leases on-balance-sheet post-2019).
Under an operating lease, the leasing company owns the solar asset and claims AIA. You pay a fixed monthly fee — typically lower than hire purchase because you are not buying the asset. Lease payments are fully deductible as operating expenses. At lease end, you typically return the asset or purchase at market value.
Trade-off: Monthly payments are lower than HP but you forgo ownership and AIA. Over a 25-year system life, operating lease costs more than cash purchase by 20-40%.
Option 4: Solar Power Purchase Agreement (PPA)
Best for: Businesses with no capital budget, loss-making businesses, and those seeking zero maintenance responsibility.
A Solar PPA is a long-term contract where a third-party investor installs and owns solar panels on your roof. You pay for the electricity generated at a fixed rate — typically 10-18p/kWh — locked in for 10-25 years. Your savings are the difference between the PPA rate and your grid rate (typically 27p/kWh).
How savings work: If your grid rate is 27p/kWh and your PPA rate is 12p/kWh, you save 15p on every kWh your solar system generates. A 100kW system generating 100,000 kWh/year saves £15,000/year with zero capital.
PPA providers in the UK: Squeaky, Enviromena, Lightsource bp, WElink Energy, and various regional commercial solar developers offer PPAs for systems from 25kW upward.
For a full guide, see our Commercial Solar PPA Guide.
Option 5: Roof Rental
Best for: Building owners who want passive income without managing an energy project.
Under a roof rental arrangement, a solar developer installs panels on your roof, owns the system, and pays you an annual rent (typically £500-£2,000/year per 100kW) for use of your roof. You also receive a reduced electricity rate — often 10-15% below your grid rate — for any electricity you consume from the system. You have no capital cost and no maintenance responsibility.
Roof rental returns are modest compared to cash purchase or PPA, but for building owners who do not occupy the building (e.g., landlords leasing to tenants), it converts a dormant asset (roof space) into recurring income.
Option 6: Green Business Loans
Best for: Businesses that want to own the system and claim AIA but prefer to borrow rather than use working capital.
Green business loans for solar are available from:
- British Business Bank (UK-wide) — Green Economy Finance scheme, rates from 3.5%
- High street banks — Barclays, Lloyds, NatWest and HSBC all offer green business loans for solar at 4-8%
- Specialist lenders — Nucleus Commercial Finance, Funding Circle, iwoca offer unsecured business loans for solar 5-10%
- Business Energy Scotland — SME loans for Scottish businesses
Discuss Finance Options at Your Free Survey
Our surveyors model cash, HP, lease and PPA scenarios side by side so you can choose the option that best fits your tax position and cash flow. No obligation.
Book Free SurveyFrequently Asked Questions
What commercial solar finance options are available in the UK?
UK businesses can finance commercial solar through: (1) Cash purchase — best ROI, full AIA benefit; (2) Asset finance / hire purchase — fixed monthly payments, you own the asset and claim AIA; (3) Operating lease — off-balance-sheet option, lower monthly cost than HP; (4) Solar PPA (Power Purchase Agreement) — zero capital, pay per kWh at a rate below grid; (5) Roof rental / green lease — installer pays you rent, you receive discounted electricity; (6) Green commercial mortgage or refinance — borrow against property to fund solar. Best option depends on tax position, cash flow, and balance sheet preferences.
Is commercial solar finance tax efficient?
Cash purchase and asset finance (hire purchase) are most tax-efficient because you claim AIA on the capital cost, saving 25% Corporation Tax in year 1. Under an operating lease or PPA, the finance company owns the asset and claims AIA — not you. However, lease and PPA payments are fully deductible as operating expenses. For businesses with large taxable profits, cash purchase or asset finance maximises tax efficiency. For businesses in a loss position or with limited capital, PPA or operating lease is preferable.
What is a solar PPA for businesses?
A solar Power Purchase Agreement (PPA) is a long-term contract where a finance company installs solar panels on your roof at no cost. You agree to buy the electricity generated at a fixed price (typically 10-18p/kWh) — below grid rates — for 10-25 years. You benefit from cheaper electricity from day 1 with no capital expenditure or maintenance responsibility. At contract end you can purchase the system, extend the PPA, or have the panels removed. PPAs are ideal for businesses that cannot claim AIA, lack capital, or prefer off-balance-sheet treatment.
Can I get a commercial solar loan?
Yes — both secured and unsecured commercial solar loans are available. High street banks (Barclays, HSBC, Lloyds, NatWest) and specialist green finance lenders offer solar-specific business loans at 4-8% over 5-10 years. British Business Bank green loans offer rates from 3.5% for qualifying businesses. Asset finance secured against the solar equipment itself can be obtained at 5-9% with no property security required. For public sector bodies, PSDS provides direct grant funding. For Scottish businesses, Zero Waste Scotland SME loans offer competitive rates.
Should I buy or lease commercial solar panels?
Buy if: you have capital or can borrow cheaply; you pay Corporation Tax (to benefit from AIA); you want maximum long-term ROI. Lease/PPA if: you lack capital or cash flow; your business is loss-making (AIA worthless); you want zero maintenance responsibility; your board prefers off-balance-sheet treatment. Financial comparison: cash purchase of a £75,000 100kW system yields £27,000/year in savings with a 2-year payback. A PPA on the same system saves £9,000/year (based on 7p/kWh PPA vs 27p grid rate) with no capital required. Over 25 years, cash purchase generates £250,000 more net benefit — but requires £56,250 net capital upfront.