Skip to content
Commercial Solar Finance UK · Independent
Q&A · Zero capex routes

No upfront cost commercial solar — UK 2026 routes

Three UK commercial solar finance structures deliver "no upfront cost" — Power Purchase Agreement (PPA), operating lease, and finance lease / green loan / asset finance with full financing. They differ materially on contract length, lifetime cost, ownership at end of term, and operational responsibility. Here's the honest comparison.

The four zero-capex structures

1. Power Purchase Agreement (PPA)

Developer funds 100% of capex; you pay per kWh consumed. £0 upfront, £0 monthly fixed cost; pay only for produced energy at discounted rate. 20-25 year contracts. Developer captures tax allowances and operates the system.

Lifetime cost vs capital purchase: £400-700k more on a 250 kWp system over 25 years.

2. Operating lease

Leasing company funds 100% of capex; you pay fixed monthly rent for 5-8 years. £0 upfront, fixed monthly. Off-balance-sheet under FRS 102 small-entity. Lessor captures tax allowances. Often includes O&M.

Lifetime cost vs capital purchase: £40-70k more over 25 years.

3. Finance lease (full finance)

Lessor funds 100% of capex; you pay monthly for 7-10 years. Similar to a loan with leasing-company structure. Lessee captures tax allowances. £0 upfront, fixed monthly.

Lifetime cost vs capital purchase: £30-50k more over 25 years.

4. Green loan or asset finance

Lender funds 100% of capex; you make monthly loan / HP repayments over 5-10 years. Borrower owns from day 1, captures full tax allowances, owns outright after term. £0 upfront, fixed monthly.

Lifetime cost vs capital purchase: £45-65k more over 7-10 years (interest cost).

Choosing between zero-capex routes

CriterionPPAOperating leaseFinance leaseGreen loan
Contract length20-25 yrs5-8 yrs7-10 yrs7-10 yrs
Tax allowance captureDeveloperLessorYouYou
Balance sheetOff (always)Off (small-entity)On (FRS full / IFRS)On
Operational dutyNoneLessor (often)YouYou
Best forLong tenure, no FYA value5-8yr horizon, off-BS priorityFYA capture + leasing structureFYA capture + own outright

Related questions

Is "no upfront cost" really no upfront cost?
Genuinely yes for PPA, operating lease, finance lease, green loan, asset finance. Soft costs (legal review, accounting advice, advisory fees) range £4k-£35k typically and are paid upfront. The system installation itself is funded by the third party / lender — zero capex outflow for the system.
Which zero-capex route has the best lifetime economics?
Green loan typically wins because borrower captures tax allowances and owns outright after loan term. £45-65k lifetime cost premium vs capital is the lowest of the zero-capex routes. PPA has the highest lifetime cost premium (£400-700k) but extends the longest with no operational responsibility.
What credit history do I need for a no-upfront-cost structure?
PPA: developer assesses offtaker covenant; trading position 3+ years typical. Operating lease and finance lease: similar to PPA + asset security. Green loan: typically requires established trading + clean credit. Asset finance: most flexible — accepts wider credit profiles than green loans.
Can I get zero upfront and zero monthly cost?
Closest is PPA — zero upfront and pay only per kWh consumed. Months with low generation (winter, holiday shutdowns) have low PPA cost; months with high generation have higher cost. But never literally £0 monthly. Operating lease and finance lease have fixed monthly cost.
Which works best for charities with no upfront cost preference?
PPA structure typically works best for charities — it bypasses the FYA capture issue (charity can't use it anyway) and provides operational simplicity. Trading-subsidiary capital purchase is an alternative but requires a subsidiary structure and clean charity-trading separation.

Continue reading

PPA detailed page

Mechanics, contract terms, market map for UK commercial solar PPA.

Operating lease detailed page

Off-balance-sheet structure with fixed monthly rent.

Green loans detailed page

Specialist green-debt funding with full ownership and tax allowance capture.

Want this applied to your specific situation?

We model the relevant finance structures against your project numbers. Five working days from enquiry to indicative comparison across capital purchase, green loan, lease, and PPA.

Request a finance review