Business green loans for commercial solar: UK lender comparison 2026
Six lender categories serving the UK commercial solar green-loan market, with typical rates, terms, and best-fit profiles. Use as a screening framework before approaching specific lenders directly.
This page is about business finance. If you are funding a commercial array for a company, charity or public body, answer six questions for an indicative shortlist of the routes that fit. Householders: see the Money Helper and Ofgem guidance rather than this site.
Check your finance routeAbout the rates on this page. Rates and terms shown are indicative guides to how routes compare, not quotes and not current published lender terms; they have not been re-verified against each lender. Confirm any rate with the lender before you rely on it.
Indicative rates and terms reflect representative 2026 market conditions; specific lender pricing depends on credit position, project size, and sustainability-due-diligence outcomes. Verify with each lender directly.
Finance route checker
Is a green loan the right route? Check your finance options
A green loan is one of several ways to pay for an array. Answer six questions to see how it ranks against cash, hire purchase, lease and PPA for your tax position and premises, then, if you want a reply, send your answers to us by email.
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The lender categories
Mainstream UK clearing banks
NatWest Group (Lombard), Barclays Business, Lloyds Banking Group, HSBC UK, and Santander UK Business all operate green-lending arms with commercial solar finance offerings. Rates typically 6.5–8.5% APR for established trading customers; terms 5–10 years. Application processing via existing relationship manager. Strongest fit for businesses with established banking relationship and clean credit position.
Specialist green debt funds
Triodos Bank (UK arm), Charity Bank (charity-sector specialist), and Ecology Building Society offer values-aligned green debt at competitive rates. Triodos rates 5.5–7.5% APR typical, with strong appetite for renewable-energy and B Corp customers. Application typically slower than clearing banks but more flexible on covenants.
Challenger banks
Allica Bank, Cynergy Bank, Aldermore, OakNorth Bank operate commercial lending including green-finance variants. Typically faster credit decisions than clearing banks (often 5–10 working days) at slightly higher rates (7–9% APR). Good fit for SMEs and mid-market businesses needing speed.
Specialist solar / renewable lenders
UK Climate Investments (UK-government-backed), Green Business Bank facility (proposed under government green-finance framework), and a small number of specialist renewable-debt funds. Typically larger ticket sizes (£500k+); rates competitive but application processes substantial.
Combined-authority green funds
MEEF (Greater London), GMCA Green Finance Facility, WMCA Green Finance, and equivalent. Open primarily to public-sector and not-for-profit borrowers. Rates 6–8% APR typical with longer terms (10–15 years).
Asset-backed term loan structures
Several UK asset finance lenders offer term-loan structures secured against the solar asset specifically — Lombard, ITS Solar, Genesis Capital. Rates typically 7–9% APR; terms 5–10 years. Strongest fit for businesses without established commercial-banking relationship.
Indicative rate map (2026)
| Lender category | Rate range | Term | LTV | Decision speed |
|---|---|---|---|---|
| Mainstream UK clearing | 6.5–8.5% APR | 5–10 years | 80–100% | 4–8 weeks |
| Specialist green debt funds | 5.5–7.5% APR | 7–15 years | 85–100% | 6–10 weeks |
| Challenger banks | 7–9% APR | 5–7 years | 70–90% | 2–4 weeks |
| Specialist solar lenders | 6–8% APR | 7–12 years | 90–100% | 8–12 weeks |
| Combined-authority green funds | 6–8% APR | 10–15 years | 100% | 8–12 weeks |
| Asset-backed term loans | 7–9% APR | 5–10 years | 80–90% | 3–6 weeks |
Decision framework
Choose lender category based on three primary factors: (a) speed required, (b) ticket size and complexity, (c) existing banking relationship.
- For projects under £200k with established banking relationship: mainstream clearing bank or challenger bank.
- For projects £200k–£1m: competitive process across mainstream + specialist green debt + asset-backed term loan.
- For projects above £1m: specialist solar lender + combined-authority green fund (where eligible) typically outcompete mainstream banks on rate.
- For public sector and not-for-profit borrowers: combined-authority green funds and Charity Bank typically deliver below-market rates.
- For B Corp / values-led businesses: specialist green debt funds offer values-alignment plus competitive rates.
- For speed-critical projects (year-end FYA capture pressure): challenger banks deliver fastest credit decisions.
Public lenders in Wales and Scotland
In Wales, the Development Bank of Wales Green Business Loan lends £1,000 to £1.5m over up to 15 years (Senedd written answer WQ96151) with discounted fixed interest, and names solar PV among its measures.
In Scotland, the Business Energy Scotland SME Loan, closed to solar PV for new applications, is still interest-free for other measures, so a business array is financed by a commercial lender.
In Northern Ireland we found no open public business loan for solar. Rates and terms are each lender's own decision, so this page does not quote personalised rates. Checked 3 November 2026 against the Development Bank of Wales and Business Energy Scotland pages.
Green loan lender FAQs
How do I find the best green loan rate for commercial solar?
What's the typical loan-to-value for commercial solar green loans?
How long does a green loan application take?
Can a public body use a green loan now PSDS has closed?
Are there any covenants we should watch out for?
Can a charity get a green loan for solar?
Green loan lenders for commercial solar 2026: the market in prose
The green loan market for commercial solar has expanded significantly following the UK government Net Zero commitment and the growth of ESG-focused lending. Mission-led banks, challenger lenders, and mainstream bank green finance divisions all now offer products, with rates from 5.5% APR for strong credits. Here is our current lender assessment.
Mission-led lenders: the ethical-bank route
Triodos Bank
UK market leader for ethical commercial solar lending. Rates 5.5–7.5% APR for qualified commercial borrowers. Maximum facility £5m. Triodos requires borrowers to meet environmental and social criteria beyond just the solar project. Relationship-managed; decisions take 3–5 weeks. Best rates in market for businesses with strong ESG credentials.
Ecology Building Society
Specialist in sustainable and ecological projects. Rates 6–8% APR. Maximum facility £2m. Particularly strong for unusual building types (heritage buildings, farm conversions, community buildings). Flexible underwriting; understands non-standard property.
National Wealth Fund (formerly UK Infrastructure Bank) (via partners)
NWF provides wholesale funding to lenders who on-lend to green projects. Businesses cannot access NWF directly but benefit from NWF-funded tranches in products from selected banks (NatWest, Lloyds, regional banks). Lower rates for NWF-backed tranches: 5–6.5% APR.
Named products from the mainstream banks: what each is for
NatWest Green Loan
NatWest offers a dedicated green loan for SME renewable energy projects. Rates 6–8.5% APR for existing NatWest business customers. Decision time: 10–15 business days. Strong for businesses already banking with NatWest.
Lloyds Green Finance
Lloyds Bank green business loan. Rates 6.5–9% APR. Facilities £50,000–£5m. Particularly active in manufacturing and logistics solar. Good for Lloyds business banking customers.
HSBC Sustainable Financing
HSBC UK offers green loans at competitive rates for larger businesses (turnover £2m+). Rates typically 5.5–8% APR for investment grade credits. Strong for international businesses wanting a global bank relationship.
Metro Bank
Metro Bank offers commercial solar green loans with decisions from relationship managers rather than centralised credit teams. Rates 6.5–9% APR. Particularly good for unusual or complex business structures.
Government-backed green finance schemes
British Business Bank — Green Economy Finance
BBB accredits lenders to offer green economy finance at below-market rates. Participating lenders include Coutts, OakNorth, and multiple regional banks. Look for BBB-accredited products when comparing.
Innovate UK Smart Grants (innovation element)
For businesses installing innovative solar configurations (solar + AI optimisation, building-integrated PV, novel storage), Innovate UK grants can complement green loan finance.
| Lender | Rate range | Max facility | Best for | Decision time |
|---|---|---|---|---|
| Triodos Bank | 5.5–7.5% | £5m | Strong ESG; ethical businesses | 3–5 weeks |
| Ecology BS | 6–8% | £2m | Unusual properties; community | 3–5 weeks |
| NWF (via partners) | 5–6.5% | Large | Strategic/infrastructure scale | Varies |
| NatWest Green | 6–8.5% | £5m | Existing NatWest customers | 10–15 days |
| Lloyds Green Finance | 6.5–9% | £5m | Manufacturing/logistics | 10–20 days |
| Metro Bank | 6.5–9% | £3m | Complex structures | 7–14 days |
| HSBC Sustainable | 5.5–8% | £10m+ | Large corporate | 3–5 weeks |
How green loan rates are set
Credit assessment factors
Business credit rating, years trading, profitability margin, existing debt levels, sector, and collateral all influence rate. The strongest rates go to companies with: 3+ years profitable trading, debt/EBITDA under 3x, and the solar project clearly cash flow positive from year one.
Green premium discount
Many lenders apply a 0.25–0.75% rate discount for genuinely green purposes vs equivalent standard business loans. To access this, provide evidence: energy audit showing pre-solar consumption, carbon baseline calculation, projected carbon saving.
Loan size effect
Larger loans (£500k+) typically attract better rates than smaller ones (£50k) because lender per-unit costs are lower. If your solar project is borderline economic at current rates, consider whether a larger system (with proportionally better rate) improves the overall economics.
UK green loan lender comparison 2026: rates, terms and LTV by lender
Green loans for commercial solar have become the most competitive lending segment in UK business finance. In 2024–2026, a growing number of lenders now offer some form of green or sustainability-linked loan product for commercial solar PV, ranging from the high-street banks' ESG divisions to specialist solar asset finance desks. Rates have tightened significantly since 2022: a well-structured £200k solar loan on a freehold commercial property for a profitable SME now prices at 6.0–7.5% APR with the strongest lenders.
This lender comparison covers 14 active UK green loan providers for commercial solar in 2026, organised by lender type. All rate ranges are indicative for secured green loans on commercial solar assets with 3+ years trading history. Rates change frequently — treat this as a framework for shortlisting, not a quotation.
High-street bank green loan divisions
| Bank | Product name | Min loan | Max loan | Rate range (APR) | Max term | Arrangement fee | Decision time |
|---|---|---|---|---|---|---|---|
| NatWest | Green Loans / Clean Growth Finance | £25,000 | £5m+ | 5.9–9.5% | 10 years | Nil–1.5% | 2–4 weeks |
| Lloyds Bank | Clean Growth Lending | £50,000 | £10m+ | 6.2–9.8% | 12 years | Nil–1.5% | 3–5 weeks |
| HSBC | Sustainable Finance / Green Loan | £100,000 | No ceiling | 5.8–9.2% | 10 years | 1.0–2.0% | 4–6 weeks |
| Barclays | Green Loans | £50,000 | £10m+ | 6.0–9.5% | 10 years | Nil–1.5% | 3–5 weeks |
| Santander | Green Business Loan | £25,000 | £2m | 6.5–10.5% | 7 years | Nil–1.0% | 2–4 weeks |
Challenger banks and specialist lenders
| Lender | Min loan | Max loan | Rate range (APR) | Max term | Key differentiator |
|---|---|---|---|---|---|
| OakNorth Bank | £250,000 | £20m+ | 6.5–10.5% | 10 years | Bespoke deal structuring; no off-the-shelf credit boxes |
| Shawbrook Bank | £50,000 | £3m | 7.5–12.5% | 7 years | Fast decisions (1–2 weeks); accepts shorter trading histories |
| Paragon Bank | £50,000 | £5m | 7.0–11.0% | 10 years | Strong on multi-site portfolios; property investment background |
| Aldermore | £25,000 | £500k | 8.0–13.5% | 7 years | Accepts sub-2-year trading; higher rates reflect risk premium |
| Hampshire Trust Bank | £100,000 | £2m | 7.5–11.5% | 7 years | Specialist in commercial property lending; accepts complex structures |
Specialist solar and clean energy lenders
| Lender / platform | Type | Min deal | Max deal | Rate / cost | Key feature |
|---|---|---|---|---|---|
| Siemens Financial Services | Captive asset finance (solar) | £50,000 | £5m | 6.0–10.0% | Manufacturer-aligned; strong on Siemens-equipment projects |
| Close Brothers Asset Finance | Independent asset finance | £25,000 | £2m | 7.0–11.5% | Dedicated clean energy desk; strong in agricultural solar |
| Propel Finance | Whole-of-market broker | £10,000 | £2m+ | Best of market | Broker accesses 40+ lenders; no fee to borrower; arrangement absorbed in rate |
| Solar Finance UK | Solar-specialist broker | £25,000 | £5m+ | Best of market | Solar-only broker; highest market knowledge; access to specialist lenders not on open market |
| Lendoe | Peer-to-peer / marketplace | £50,000 | £1m | 7.0–12.0% | Faster for smaller deals; institutional backing on larger tranches |
Combined authority and regional green funds
Since 2022, the UK's Combined Authorities and Mayoral Development Corporations have launched a range of green business loan funds specifically targeting SME solar and energy efficiency. These are often the cheapest route available — funded by UKSPF or Levelling Up grants with below-market interest rates — but they are geographically limited and typically have lower loan ceilings.
| Fund | Region | Rate | Max loan | Key conditions |
|---|---|---|---|---|
| Greater Manchester Business Growth Hub — Green Business Loans | Greater Manchester | 3.5–6.0% | £150,000 | Must operate in GM; must demonstrate energy use reduction |
| West Yorkshire Investment Fund — Clean Energy Loans | West Yorkshire CA area | 4.0–6.5% | £200,000 | SMEs with under 250 employees; energy audit required |
| Midlands Engine Investment Fund II — MEIF Green Loans | Midlands | 5.0–7.5% | £250,000 | Operates via NPIF partner banks; 3 years minimum trading |
| London Business Hub — LOOP Fund | Greater London | 3.0–5.5% | £100,000 | London-based SMEs; can fund solar + EV + LED combined |
| South West Investment Group — Clean Business Loans | South West England | 4.5–7.0% | £150,000 | Must be trading in SW England; energy audit grant available |
How to compare green loan offers: the four numbers that matter
When comparing green loan offers, most businesses focus on the headline interest rate. This is a mistake. The four numbers that determine total cost are: (1) the Annual Percentage Rate (APR) — this includes fees; a 6.5% rate with 2% arrangement fee is often more expensive than a 7.5% rate with no fee on a 7-year term; (2) the total amount repayable — ask every lender for this figure in writing; (3) early repayment charges — ERCs of 2–5% are common in green loans; if you might refinance or sell the property in the next 3–5 years this materially affects the true cost; (4) the security requirement — a debenture over your whole business is a much larger security concession than a fixed charge on the solar asset alone.
LTV ratios for commercial solar green loans: what lenders actually lend
LTV ratios in commercial solar green loans are based on the installed cost of the system (not the property value). Most lenders will fund 70–90% of the installed cost for well-structured deals on freehold commercial property. The floor drops to 60–75% for leasehold property (particularly short leaseholds under 15 years) and 50–65% for ground-mount systems on agricultural land with uncertain planning. Where the LTV is below what you need, the gap can be bridged with the AIA tax relief timing — claim AIA in year one to reduce the effective net cost to 75–80% of the gross installed cost, then the lender's 70% LTV effectively covers the full post-tax cost.
What lenders check before approving a commercial solar green loan
| Stage | What the lender reviews | Minimum requirement (typical) |
|---|---|---|
| Business financials | 2–3 years filed accounts; management accounts if last accounts >6 months old | Profitable in at least 2 of last 3 years; net assets positive |
| Debt service coverage | Annual energy saving vs annual loan repayment | DSCR ≥1.2x (energy saving must cover 120% of annual repayment) |
| Asset quality | Structural survey; roof condition; remaining roof life | Minimum 20 years remaining useful life; planning consent confirmed |
| DNO / grid connection | G99 pre-application or formal application in progress | G99 pre-app letter from DNO confirming connection feasibility |
| Title and tenure | Freehold title or lease term vs loan term | Lease remaining must exceed loan term by minimum 5 years |
| Personal guarantee | Director credit check; personal assets | Clean personal credit file; no undischarged CCJs |
Finance route checker
Which finance route fits your solar project?
Answer six questions and see an indicative shortlist straight away: cash purchase, hire purchase, loan, lease or PPA, ranked for your tax position, premises and budget. If you want a reply, send your answers to us by email at the end.
Thanks, your answers are with us.
We reply by email. Your shortlist stays on this page.
Something went wrong.
The form could not be submitted. Please try again, or email info@commercialsolarfinance.co.uk directly.
Lenders quote net of VAT; how the VAT on the installation is recovered by route is set out on the VAT page, with the cash-flow gap under each structure.
Householders and companies are in different credit regimes: business and personal solar loans differ.
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