What it means
In project finance, the asset is owned by a purpose-built entity, usually called a special purpose vehicle, whose only business is that project. Lenders assess the project's forecast cash flows and its contracts, not the credit rating of the parent company behind it.
The arrangement matters because the debt is largely non-recourse, meaning that if the project fails, lenders can seize the project company's assets but generally cannot pursue the sponsor's other businesses. That ring-fencing is why a mid-sized developer can build a $400,000,000 asset without putting the rest of the group at risk.
Because the repayment depends entirely on one revenue stream, lenders demand contractual certainty around it. Typical structures include a long-term offtake agreement fixing who buys the output and at what price, a fixed-price construction contract, and an operations and maintenance contract, so that the main risks sit with parties able to manage them.
The central financial test is the debt service coverage ratio, which compares the cash the project generates to the debt payments due. Lenders set a minimum, commonly between 1.2 and 1.5 times depending on how predictable the revenue is, and they usually block dividends to the sponsor if the ratio falls below an agreed lock-up level.
Gearing is far higher than in ordinary corporate borrowing, often 70% to 80% debt, because the contracted cash flows are so predictable. The cost is complexity: legal and advisory fees are heavy, arranging the finance can take a year or more, and the documentation restricts what the project company may do for the life of the loan.
In practice
Real-world examples
Example 1
A utility builds a $600,000,000 offshore wind farm through a separate project company, with 75% bank debt repaid from a 15-year contract to sell the electricity at a fixed price. The parent's own credit rating is unaffected because the debt is non-recourse.
Example 2
A government awards a 25-year toll road concession. The consortium raises debt against forecast toll revenue, and because traffic forecasts are less certain than a fixed offtake contract, lenders require a minimum DSCR of 1.45 rather than the 1.2 typical of contracted power projects.
Example 3
A mining company funds a new processing plant with project debt supported by long-term supply agreements with two smelters. Lenders insist on a six-month debt service reserve account, funded at completion, to absorb any short interruption to production.
Think of it
Imagine starting a bakery with a group of friends. Instead of using your personal houses as collateral, you set up a cash box on the counter. The bakery loan is paid back only using the coins dropped into that specific box, protecting your personal savings if the bakery struggles.
Formula
Calculation
Debt service coverage ratio (DSCR) = cash available for debt service / total debt service due
Cash available for debt service = project revenue - operating costs (before interest, tax and depreciation)
A solar farm costs $120,000,000 to build and is funded 70% by debt and 30% by equity:
Debt: $120,000,000 x 0.70 = $84,000,000
Equity: $120,000,000 x 0.30 = $36,000,000
In a typical operating year the project expects:
Revenue under a 20-year power purchase agreement: $24,000,000
Operating and maintenance costs, insurance and land rent: $9,600,000
Cash available for debt service = $24,000,000 - $9,600,000 = $14,400,000
Annual debt service, being principal plus interest, is $9,600,000.
DSCR = $14,400,000 / $9,600,000 = 1.5 times
The cash left for equity is $14,400,000 - $9,600,000 = $4,800,000, a cash return of $4,800,000 / $36,000,000 = 13.3% on the sponsor's investment. If output came in 20% below forecast, cash available would fall to roughly $9,600,000 and the DSCR would drop to about 1.0, leaving nothing for the sponsor and breaching the lock-up covenant.Case study
Seen in the real world
Halloway Renewables is a fictional developer used purely as an illustrative example. It wanted to build a $180,000,000 biomass plant but had a balance sheet of only $40,000,000, so corporate borrowing was never a realistic route.
It formed a project company, signed a 20-year contract to sell heat and power to an industrial customer, a fixed-price turnkey construction contract with a completion guarantee, and a 15-year fuel supply agreement. On that basis lenders provided $126,000,000, being 70% of the cost, at a minimum DSCR covenant of 1.35 with dividends locked up below 1.20. Halloway contributed $54,000,000 of equity, some of it from a co-investor.
Construction ran three months late, but the fixed-price contract meant the builder bore the cost and paid $2,100,000 in delay damages, which covered the extra interest during construction. Halloway's other projects were entirely unaffected, which is the whole purpose of the ring-fenced structure.
Watch out
Common mistakes
- Assuming non-recourse means no risk to the sponsor, when sponsors typically still provide completion guarantees, equity commitments and warranties that carry real exposure.
- Building a financial model on optimistic output or price assumptions, since lenders will run downside cases and size the debt on those rather than on the base case.
- Underestimating the time and cost of arranging the finance, which routinely runs to a year of legal, technical and insurance due diligence before the first drawdown.
Questions
People also ask
What does the special purpose vehicle actually do?
It owns the asset, holds all the project contracts, borrows the debt and receives the revenue, which keeps the project's risks and cash flows separate from the sponsor's other activities.
Why is the debt service coverage ratio so important?
It is the single measure showing whether project cash covers the loan payments, and it drives how much debt lenders will advance and when the sponsor may be paid dividends.
Is project finance cheaper than corporate borrowing?
The interest margin is usually higher and the arrangement costs are much larger, but the far higher gearing and the protection of the sponsor's other businesses often make it the better overall choice for a large standalone asset.