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Commercial Solar Finance UK · Independent
Finance route checker · UK-wide · IndependentUK Commercial Solar Finance · Est. Independent Guide

The right capital structure for commercial solar finance — before the install.

Independent UK guidance on capital purchase, green loans, operating and finance leases, and Power Purchase Agreements for commercial solar PV. Model after-tax economics across every structure and choose on the result, not on lender margin.

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50%

First Year Allowance for special-rate plant such as solar — a permanent relief for company spend above the £1m AIA limit.

3–5y

Typical post-tax payback for capital-funded commercial solar in 2026.

6

Finance structures modelled side-by-side on every project — no defaults, no commissions.

£0

Manufacturer commissions — we don't take them, on principle.

Editorial principles

UK-only practice Independent — no commissions Six structures, every project Six finance routes compared Editorial accountability

What is commercial solar financing?

Commercial solar financing is the process of funding a commercial solar PV installation through a structured financial product rather than direct capital expenditure. In the UK in 2026, there are six distinct commercial solar financing routes: capital purchase (owner-funded with AIA tax relief), green loans (asset finance with the borrower retaining capital allowances), hire purchase, operating lease, finance lease, and Power Purchase Agreements (PPA). Each structure differs in balance sheet treatment, tax eligibility, upfront capital requirement, and total 25-year cost.

The choice of commercial solar financing structure is often more impactful than the choice of installer or equipment. A business that selects the wrong financing route can pay 30–60% more in total project cost over 25 years than a business that matches its financing structure to its tax position, capital availability, and property tenure. Our independent guides cover every commercial solar financing option in the UK market, with worked examples and comparisons for every business profile.

Green loans Power Purchase Agreements Operating lease Compare all financing routes →
Finance Structures

Six ways to fund commercial solar — each with a clear best-fit case.

No single finance structure wins for every business. The right one depends on your tax position, capital constraints, balance sheet preferences, and how long you'll occupy the building. Here's the honest comparison.

UK commercial solar financing — six structures, each modelled to after-tax IRR on your numbers. Capital purchase, green loans, operating lease, finance lease, PPA, and asset finance.

F01 Indefinite — system life of 25–30 years

Capital Purchase

Pay cash, own the asset, claim the full tax relief — the simplest structure and almost always the most economic over 25 years.

Read in detail
F02 7–15 years; commonly 10 years

Green Loans

Borrow against the project, retain ownership, smooth the cash impact — green loans typically charge 6–9% APR for solar specifically.

Read in detail
F03 5–10 years; commonly 7 years

Operating Lease

The leasing company owns the system; you pay a fixed annual rent. Off-balance-sheet, fully expensable, but you don't get the FYA.

Read in detail
F04 5–10 years; commonly 7 years

Finance Lease

Functionally similar to a loan — you pay over time, the asset hits your balance sheet, and you keep the tax benefits, but with leasing-company structure.

Read in detail
F05 15–25 years; commonly 20 years

Power Purchase Agreement (PPA)

A third party owns and operates the system on your roof; you buy the electricity at a fixed rate. Zero capital, zero responsibility, lower savings ceiling.

Read in detail
F06 3–7 years; commonly 5 years

Asset Finance

Catch-all category for hire purchase, equipment finance, and similar structures aimed at SME-scale solar projects below £250k.

Read in detail
Tax & Incentives

The reliefs that change the economics.

The Annual Investment Allowance, the 50% first-year allowance for special-rate spend above it, and the England business-rates exclusion to 2035 together change the after-tax cost of a project materially; PSDS, the public-sector grant, closed to new applications in November 2024.

All incentives

50% First Year Allowance

50% FYA

Lets a profit-making company write off half the capital cost of new commercial solar against corporation tax in year one.

Annual Investment Allowance

AIA

100% deduction in year one on the first £1m of qualifying capital spend per accounting period.

Smart Export Guarantee

SEG

Mandatory scheme requiring large electricity suppliers to pay for surplus solar generation exported to the grid.

Public Sector Decarbonisation Scheme

PSDS

Public-sector capital grant scheme for heat-led decarbonisation, which could include solar PV. PSDS closed to new applications in November 2024.

Commercial solar finance: what this site does

Commercial Solar Finance is an independent UK editorial site with one job: showing which commercial solar finance route wins on after-tax numbers. We are not a lender, not an installer, and not a commission-paid introducer: we take no commissions from any finance provider or manufacturer.

Every review models the same six routes on the same project data: capital purchase (own outright, keep the full capital-allowance position), green loans (borrow while retaining ownership and the allowances), hire purchase & asset finance for SME-scale systems, the operating lease (off balance sheet under FRS 102), the finance lease, and the solar power purchase agreement (zero capital, lower lifetime saving). The output is a like-for-like comparison – after-tax IRR, simple payback, and 25-year cumulative cash flow for each – not a recommendation shaped by whichever product pays the introducer.

Why the structure decision needs independent advice

On a typical £200k project, the spread between the best and worst finance structure over 25 years runs to tens of thousands of pounds – driven less by headline interest rates than by who keeps the capital allowances. The AIA gives 100% year-one relief on the first £1m of qualifying spend; solar PV is special-rate plant, so spend above the cap attracts the 50% special-rate first-year allowance instead. Ownership routes keep that relief; a PPA trades it away for zero upfront capital.

UK-wide – and if the numbers don't support proceeding, we say so. We take no commission from lenders or installers.

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.

Email me this shortlist

Send your answers to us and we reply by email. We do not pass your details to installers or lenders without your permission.

Your answers and contact details are used to reply to this enquiry. See our privacy notice.

The six routes are compared side by side on the commercial solar financing page, with the honest “is it worth it” framework by business situation.

The seventh route, off site: corporate PPAs for larger estates, with the CCL, VAT and REGO rules.

Start from the measured number: what a system costs per kW by region, from DESNZ's 2025/26 MCS data.

The commercial solar finance options checker ranks cash, hire purchase, loan, lease and PPA for your tax position, premises and budget.

Sector finance angles

Different sectors demand different structures.

A profitable manufacturer using capital purchase. A multi-academy trust weighing a lease against its capital programme now that PSDS has closed. A multi-let property portfolio using PPA to navigate landlord-tenant split. The structure follows the situation.

S01

Manufacturing

Daytime-heavy electricity profiles, large industrial roofs, and strong demand for capital efficiency make manufacturing the highest-economic-return sector for commercial solar.

 S02

Warehousing & Logistics

Vast roof areas and flat 24/7 demand profiles with strong cold-storage and EV-charging integration potential.

 S03

Agriculture

Farm building rooftops, ground-mount potential, and high agricultural electricity demand for grain drying, milking parlours, and refrigeration.

 S04

Schools & Academies

Schools now fund solar from capital budgets, leases or power purchase agreements; PSDS closed to new applications in November 2024.

 S05

NHS Trusts

NHS sites run 24/7 with large roofs and continuous electricity demand, which suits solar plus battery; with PSDS closed, trusts now weigh capital budgets, leases and PPAs.

 S06

Local Authorities

Council estates of operational buildings, leisure centres and depots suit portfolio-scale solar, funded now from capital budgets, PWLB borrowing, leases or PPAs.

 S07

Retail

Daytime customer-hours demand profiles align well with solar generation, especially for grocery and DIY retail with refrigeration and high-base lighting loads.

 S08

Hospitality

Hotels and venues have visible roofs, daytime conference demand, and growing customer pressure for verified sustainability credentials.

 S09

Property Portfolios

Multi-let commercial property owners face the landlord-tenant split — strategic financing structures unlock value where direct capital cannot.
Regional finance

Regional funding routes that compound on the standard reliefs.

Combined authorities, regional development funds, and city-scale programmes (MEEF in London, City Leap in Bristol, Project LEO in Oxfordshire) add to the standard FYA / AIA stack. Where you operate matters. Northern Ireland differs again: the SEG does not apply, and Northern Ireland's business solar grant (20%) is closed for 2026/27; commercial solar finance in Wales runs through the Development Bank's green loan now Ynni Cymru has closed.

London

Greater London

Mayor's Energy Efficiency Fund (MEEF)

Manchester

Greater Manchester

GMCA Net Zero portfolio funding

Birmingham

West Midlands

WMCA Energy Capital

Leeds

West Yorkshire

WYCA Net Zero Capital Programme

Bristol

South West

Bristol City Leap

Edinburgh

Scotland

Scottish finance routes

Glasgow

Scotland

Glasgow City Region Innovation Accelerator

Oxford

South East

Project LEO (Local Energy Oxfordshire)

Cambridge

East of England

Cambridgeshire & Peterborough Combined Authority (CPCA) decarbonisation

Reading

South East

Thames Valley Berkshire LEP

Milton Keynes

South East

South East Midlands Combined Authority programmes

Sheffield

South Yorkshire

SYMCA Net Zero capital programme
How a project gets financed

Five steps from first question to financed project.

  1. Your position

    Tax position, capex constraints, balance sheet preferences, occupation horizon, electricity demand profile. The variables that decide the right structure are about your business, not the system.

  2. System sizing

    An installer's site survey and structural review, the DNO position and your half-hourly demand data decide the size. The best size is the one that maximises self-consumption value, not nameplate capacity.

  3. Compare the structures

    Put capital purchase, green loan, asset finance, operating lease, finance lease and PPA side by side on the same project numbers: after-tax cost, simple payback, 25-year cash flow and the trade-offs of each. The finance route checker gives an indicative shortlist.

  4. Lenders and counterparties

    For a loan, ask more than one green lender for terms. For a PPA, check the provider's covenant, track record and contract terms before you sign.

  5. Procurement and delivery

    Appoint the installer, and keep the invoices, contract dates and commissioning documents your accountant needs for the capital allowance claim. We do not sell systems, arrange finance or supervise installations: we publish the comparisons and reply to questions by email.

Worked examples

From the worked examples — modelled projects, real structures.

Illustrative, modelled examples built from published scheme rules and typical 2024–26 pricing — not client engagements. Each shows the structuring decision and the after-tax outcome.

Manufacturing · Yorkshire

£245k food production system, customer-ESG-led

1MWp on East Anglia frozen food site. £500k cash + £300k retailer-affiliated lender. Year-1 saving £245k plus £350k+ supplier-scoring uplift over the contract.

Read the case →

NHS Trust · East Midlands

2.4MWp PSDS-funded across 8 sites

Multi-site Trust portfolio bid. PSDS Phase 3 grant covered 75% (£1.44m); the trust funded the balance. Year-1 saving £478k.

Read the case →

Office property · London

Multi-let landlord-funded with green-rent

240kWp solving a 3-year-old multi-let landlord-tenant split. Landlord-funded with green-rent uplift on 3 tenants + £35k tenant fit-out contribution. EPC D→C.

Read the case →
All 13 case studies →
Common questions

Common questions about commercial solar finance.

What's the most economic way to finance commercial solar in 2026?
For profitable, corporation-tax-paying companies with available capital, capital purchase delivers the lowest total cost of ownership over 25 years and the strongest IRR. Where capital isn't available, a green loan is typically the next-best route — the borrower retains all tax benefits including the 50% First Year Allowance, and total cost over 25 years is roughly £60k–£90k higher than capital purchase on a £200k system. PPAs deliver immediate cash flow benefit but have substantially lower lifetime returns.
How does the 50% First Year Allowance work?
If your company pays UK corporation tax and installs new commercial solar PV, the Annual Investment Allowance lets you deduct 100% of the cost (up to £1 million a year) from taxable profit in year one; the 50% first-year allowance for special-rate assets covers spend above that. On a £200,000 system, that's £100,000 deducted in year one — worth £25,000 in tax saved at the 25% main rate. The remaining 50% goes into the special-rate pool for ongoing 6% writing-down allowances. Always confirm with your accountant — the FYA interacts with the AIA and other reliefs.
When does PSDS funding cover the full cost of school solar?
It does not now: PSDS closed to new applications in November 2024, and Phase 4 is its final phase. While it was open it funded public-sector heat decarbonisation projects, and solar on a school was funded as part of such a project rather than on its own. Check which funding routes are open before planning a school project around a grant.
Can my business get solar with no upfront capital?
Yes — through a Power Purchase Agreement (PPA), where a third-party developer installs and owns the system on your roof and you buy the electricity at a fixed discounted rate. Zero capital, zero O&M responsibility. The trade-off is lifetime saving: PPAs typically deliver 30%–50% less total saving over 25 years than a capital-purchased equivalent system, because the developer captures the difference as their return on capital.
Is solar finance regulated by the FCA?
Most commercial solar finance falls outside FCA regulation because the borrowers are limited companies rather than consumers. Some structures and lenders are FCA-regulated for other purposes; a few B2B finance products fall within scope. This site is independent of any lender or manufacturer; the structure that wins on after-tax economics is the one worth choosing, regardless of who is offering it.
What size system should we install?
The right size matches your half-hourly electricity demand profile to maximise self-consumption. For most commercial sites, that means sizing to roughly 70%–90% of peak summer midday demand — enough to absorb most generation directly, with modest export at the shoulders of summer days. Size the system against actual half-hourly demand data, not annual consumption. Battery storage tips the calculation toward larger systems where the storage case stacks alongside it.
All FAQs
Why independence matters

Four reasons the structure recommendation matters as much as the structure itself.

Most UK businesses approach commercial solar finance through an installer or a single lender. Both are commercially aligned with one specific finance route. This site exists to compare the structures on the numbers, including the case where the economics do not support going ahead.

No commissions, anywhere

No fee for guides or tools, and no commission from installers, manufacturers or lenders, so a guide can say plainly when the numbers don't stack.

All seven structures, side by side

Capital purchase, green loan, finance lease, operating lease, PPA, asset finance, battery storage. Side-by-side after-tax modelling on the same numbers.

UK tax allowance depth

50% FYA, AIA, special-rate pool, PSDS, SEG. Dedicated content on each, with worked examples: for a profitable company, the allowances are the biggest single lever on project returns.

Six finance routes compared

Cash, hire purchase, loan, lease and PPA side by side.

Scope

UK-wide. Six finance structures. No commissions.

The guides are written for profitable trading companies, public-sector estates, charities and property owners across the UK. The site is independent of every manufacturer, installer and lender and takes no commission from any of them, so no provider is paid to appear in a comparison.

Geography

UK-wide — 50 city pages

Regional funding routes mapped per city; combined-authority programmes listed per city.

Finance structures

All six compared

Capital purchase, green loan, finance lease, operating lease, PPA, asset finance — side by side.

Sector coverage

14 sectors detailed

Manufacturing, warehousing, agriculture, schools, NHS, councils, retail, hospitality, property, and 5 more.

Tax-allowance depth

4 dedicated incentive pages

50% FYA, AIA, PSDS, SEG — the tax stack explained in detail.

Commercial solar financing routes

Finance Structures

Tax Incentives

By Sector

We reply by email.

Postcode, annual electricity consumption, building tenure, and your accounting year-end — that's enough to build the first-pass case across all six finance structures.

Request a finance review