Demand Risk Model
Executive Summary
Key Takeaways
- ✓ A demand risk model is a project finance financial model in which the concessionaire's revenue is linked to the actual volume of usage of the infrastructure asset: traffic volumes on a toll road, passenger numbers at an airport or transit system, container throughput at a port, or kilowatt-hours generated at a renewable energy project under a merchant power pricing arrangement.
- ✓ The demand risk model is the structural alternative to the availability payment model.
- ✓ In a demand risk model, the financial projections are highly sensitive to:
- ✓ Demand risk models are more complex to audit than availability payment models because revenue projections are inherently uncertain.
Definition¶
A demand risk model is a project finance financial model in which the concessionaire's revenue is linked to the actual volume of usage of the infrastructure asset: traffic volumes on a toll road, passenger numbers at an airport or transit system, container throughput at a port, or kilowatt-hours generated at a renewable energy project under a merchant power pricing arrangement.
Because revenue depends on usage rather than contractual availability payments, the concessionaire bears demand risk — the risk that actual demand for the asset's services falls below the projected level used to size the financing.
Contrast with Availability Payment Models¶
The demand risk model is the structural alternative to the availability payment model. The key distinction is who bears demand risk:
| Feature | Demand Risk Model | Availability Payment Model |
|---|---|---|
| Revenue driver | Usage volume × tariff | Contractual payment for availability |
| Demand risk borne by | Private concessionaire | Public contracting authority |
| Revenue certainty | Variable | High (subject to deductions) |
| Typical assets | Toll roads, airports, ports | Hospitals, schools, prisons, roads |
Key Modelling Inputs¶
In a demand risk model, the financial projections are highly sensitive to:
- Traffic or usage forecasts: typically derived from independent traffic or demand studies
- Ramp-up assumptions: the period during which actual traffic builds from opening to steady-state volumes
- Tariff escalation: the rate at which user charges increase over the concession period
- Traffic growth rate: the long-run annual increase in usage volumes
Audit Focus¶
Demand risk models are more complex to audit than availability payment models because revenue projections are inherently uncertain. Audit checks include: the source and credibility of the traffic forecast, the reasonableness of the ramp-up profile, the consistency of the tariff and escalation assumptions with the concession agreement, and whether the DSCR remains positive under a material downside demand scenario.
A common error is using a single traffic forecast without testing the model under a conservative demand scenario. Lenders typically require DSCR analysis under a defined downside demand scenario (often a percentage reduction from the base case traffic forecast).
Continue Reading¶
Prerequisites¶
- Project Finance Model Audit — the parent pillar
Related Glossary¶
- Availability Payment Model — the contrasting structure where revenue is contractual
- Concession Model — the broader category of concession-based project finance models
- DSCR — the coverage metric that demand risk directly affects
- Cash Waterfall — the payment priority structure fed by demand-driven revenue
Related Products¶
- Financial Model Audit Engine (FMAE) — deterministic structural auditing referenced throughout this guide
How OXXON tests thisRun a free structural check with FMAE
Related Articles
Availability Payment Model
An availability payment model is a project finance structure in which the public authority (the contracting authority) pays the private concessionaire a periodic payment contingent on the asset being available for use according to defined performance and availability standards, regardless of actual usage levels. The payment is not linked to traffic volumes, passenger numbers, or other demand metrics. Revenue risk remains with the public sector; the private sector takes construction risk, availability risk, and performance risk. Availability payment models are common in hospitals, schools, prisons, roads, and rail infrastructure where the contracting authority wishes to retain demand risk while transferring construction and maintenance risk.
Concession Model
A concession model is a financial model built for a public-private partnership in which a private concessionaire receives the contractual right to develop, operate, and earn revenues from a public infrastructure asset for a defined concession period, in exchange for meeting specified performance and availability standards. The financial model projects the concessionaire's revenues (from either availability payments, user charges, or a combination), operating and maintenance costs, capital expenditure, financing costs, and returns to equity investors over the concession period.
Cash Waterfall
A cash waterfall is the contractually defined priority sequence in which cash generated by a project is allocated to successive payment obligations. In a project finance structure, the cash waterfall determines the order in which operating costs, debt service (interest and principal), reserve contributions, and equity distributions are paid from the project's revenue. Senior obligations are paid first; junior obligations and distributions are paid only after senior obligations are fully satisfied. The DSCR and other coverage covenants are calculated at specific points within the waterfall to determine whether cash can flow to the next level.