Capital-free commercial solar means your business accesses rooftop PV generation without committing any capital expenditure. Two routes dominate: Power Purchase Agreements (PPA) and solar asset finance. Under a PPA, a third-party funder owns the solar panels installed on your roof and you buy the electricity generated at a contracted rate — typically 12-15p/kWh against a grid retail price of 22-28p/kWh. Under asset finance, you own the system from day one and repay the lender monthly, typically at a rate set below your electricity bill saving so cash flow is positive from month one. Both routes are available to UK businesses of all sizes from 50 kW warehouse installs to multi-site 10 MW portfolio programmes.
How a solar PPA works for UK commercial properties
A Power Purchase Agreement (PPA) is the most fully capital-free route. A specialist solar funder pays for system design, supply, installation and ongoing maintenance. You sign a 10-25 year agreement to purchase electricity from the system at a discount to current grid rates — typically 12-15p/kWh versus 22-28p/kWh in 2026. From the first meter reading you receive lower electricity invoices with no asset on your balance sheet. The funder claims capital allowances and takes the maintenance risk. At contract end, you typically have the option to purchase the system for nominal consideration, extend the PPA, or have it removed at the funder's cost. PPAs work best for: businesses with long lease commitments (10+ years remaining), no or limited corporation tax liability (making capital allowances less valuable), or capex constraints from lender covenants. Common PPA users: logistics 3PLs with leased buildings, NHS-type organisations, local authority portfolios, retail chains.
Solar asset finance: own the system with zero upfront payment
Asset finance (sometimes called a solar loan or hire purchase arrangement) allows your business to own the solar PV system while spreading the cost over 5-10 years via fixed monthly repayments. The critical feature: monthly repayment is typically set below the electricity bill saving generated — making the arrangement cash-flow positive from month one. A 500 kW warehouse system costing £400,000, financed at 6% APR over 7 years, generates monthly savings of approximately £6,500-£7,500 against repayments of approximately £5,900 — a net cash benefit of £600-£1,600/month from day one. You own the system, claim 100% AIA on first £1m expenditure (reducing effective cost to £300-£340k at 19-25% corporation tax), and receive the full energy savings benefit after the repayment period ends. Finance is available against the solar panels as primary security — no property charge typically required for systems under £2m.
PPA vs asset finance vs outright purchase: full comparison
Three-route comparison for a typical 750 kW warehouse system (£580,000 installed cost, 25p/kWh grid rate, 900 kWh/kWp/yr yield, 80% self-consumption): (1) Outright purchase: Day-one capex £580,000; AIA saves £145,000 in year-one tax; net day-one cost £435,000; 25-year savings £1.8m; IRR 18-22%. Best for: owner-occupiers with strong tax position and available capital. (2) Asset finance (7yr, 6% APR): No upfront cost; monthly savings net of repayment £800-£1,500; after finance term full £11,000+/month savings; 25-year savings £1.5m after interest. Best for: businesses wanting ownership without capex. (3) PPA (15yr, 12p/kWh): No upfront cost; monthly bill saving £8,500-£9,500 vs grid rate; 25-year effective savings £900k-£1.1m (lower than ownership as funder takes margin). Best for: tenants, capex-constrained, off-balance-sheet requirement. The right choice depends on your tax position, lease length, balance sheet requirements, and risk appetite. We model all three routes for every project.
Which businesses qualify for capital-free commercial solar?
Eligibility criteria vary by funding route. PPA: minimum system size 100 kW; minimum 10-year lease remaining or freehold; creditworthy tenant (well-established business preferred); structurally sound roof. Asset finance: minimum 50 kW; business in operation 2+ years; positive trading history; property ownership or landlord consent. Solar asset finance is available for: warehouses (50 kW-10 MW), factories (100 kW-5 MW), offices (50 kW-500 kW), retail DCs, cold chain, manufacturing. We confirm eligibility and present indicative terms from our funder panel within 48 hours of a desk feasibility submission.
Capital-free solar for multi-site portfolios
Multi-site portfolio programmes — 5 to 100+ properties across a national logistics, retail or manufacturing estate — are particularly well-suited to capital-free structures. Framework PPAs allow a single agreement to cover multiple sites, with roll-out phased over 12-36 months. Portfolio asset finance facilities provide a single credit line drawn down as each site completes. Key portfolio considerations: roof condition survey programme (desk-top first pass, then structural survey on qualifying sites); DNO connection portfolio programme (bulk G99 submission process); standardised legal documentation; single performance reporting dashboard. We have delivered multi-site capital-free programmes for national 3PLs with 8-45 sites, achieving average savings of 22-35% on electricity across the portfolio from the first full year of operation.
Common questions about capital-free solar
What is a commercial solar PPA?
A Power Purchase Agreement (PPA) is a contract where a third-party funder installs and owns solar panels on your building and sells the electricity generated to you at a below-market rate — typically 12-15p/kWh versus 22-28p/kWh grid in 2026. You get lower electricity bills with zero capital expenditure.
Is solar asset finance the same as a PPA?
No. Under asset finance, your business owns the solar system and repays the lender monthly. You claim capital allowances and receive the full energy savings. Under a PPA, a third party owns the system. Asset finance is cash-flow positive from month one if structured correctly.
What size system qualifies for capital-free solar?
PPA funders typically require minimum 100 kW systems (approximately 60,000 sqft of warehouse or similar). Asset finance is available from 50 kW. A 100,000 sqft warehouse typically supports 400-600 kW of rooftop PV — well above both thresholds.
Can tenants access capital-free commercial solar?
Yes — PPAs are frequently used by tenants because the funder installs on leased roofs with landlord consent. Asset finance is also available for tenants with sufficient lease remaining (typically 10+ years from completion). Green Leases increasingly include solar PPA consent clauses.