Availability Payments vs. User Fees in Public-Private Partnerships

What Are Availability Payments in Public-Private Partnerships?

In public-private partnerships, availability payments are regular, set payments from a government or public authority to a private partner. These payments depend on the asset working properly and meeting certain standards. 

Unlike user-fee models, they are not linked to how much the asset is used. This makes revenue more predictable and reduces financial risk for the private operator.
Some key features are:

• Performance-based: Payments are made only if the private partner meets the agreed operational and maintenance standards.
• Predictable cash flow: Monthly or quarterly payments give a steady income, which is attractive to lenders and investors
• Penalties for downtime: If the private partner does not meet service targets, payments are reduced. This encourages high-quality operations.

Availability payments are usually applied in areas where charging the users is difficult, such as hospitals, schools, water treatment plants, and public transit. With stable revenue, it is possible to use private expertise, with the government still controlling access and costs.

What are Public-Private Partnerships? 

Public-private partnerships (PPPs) are built on a simple promise: combine public oversight with private-sector efficiency to deliver critical infrastructure.

However, every successful PPP raises a more complex question: how does the private partner actually get paid?

This is where the choice between availability payments and user fees becomes central to structuring a public-private partnership. Deciding between these two revenue models affects risk allocation, financing costs, political acceptance, and long-term project results.

It’s similar to comparing owning a rental property with running a toll booth. One provides a predictable monthly income, while the other depends on daily customer numbers. Both approaches can work, but not for the same reasons or in the same situations.

How Availability Payments Work in Practice

In an availability-based PPP, the government agrees to make regular payments, either monthly or quarterly, throughout the life of the concession.

Payments are typically reduced if:

• The facility is unavailable.
• Performance metrics are missed.
• Maintenance standards are not met.

As long as the road, hospital, or transit system is working and meets requirements, the payments continue on schedule.

Common Sectors Using Availability Payments

Availability payments are more prevalent in industries that require public access.

Examples include:

1. Hospitals and healthcare facilities
2. Schools and universities
3. Social infrastructure
4. Rail systems and transit corridors
5. Water and wastewater treatment plants

In these services, the possibility of directly charging the customer may sometimes not be feasible.

Why Governments Choose Availability Payments

The governments prefer payments based on the availability of water if they have:

• Predictable service delivery
• Tight control over pricing or access
• Private-sector efficiency without privatizing demand

In the public sector, demand risk is not transferred but is retained.

Through this approach, governments can ensure public access at no cost or usage charges while leveraging the private sector's investment.

What Are User Fees in Public-Private Partnerships?

User fees take the revenue model in a different direction.

Instead of being paid by the government, the private partner earns revenue directly from end users through tolls, fares, or service charges. If people use the asset, the concessionaire gets paid. If they don’t, revenue falls.

How User Fee PPPs Generate Revenue

In a user-fee structure, the concessionaire:

• Builds the asset
• Operates and maintains it
• Collects fees from users

Revenue depends on traffic volume, ridership, or consumption levels. Classic examples include toll roads, bridges, tunnels, and airports.

Typical Assets That Use User Fees

User fees tend to work best where:

• Demand is measurable and stable
• Users accept paying directly
• Alternatives are limited

Common examples include:

1. Toll highways
2. Airports and seaports
3. Parking infrastructure
4. Energy distribution assets
5. Certain water utilities

In these projects, demand is the main source of revenue.

Why Governments Use User Fee Models

User fees appeal to governments because they:

• Reduce fiscal pressure
• Transfer demand risk to the private sector
• Align payment with usage.

In theory, users pay only for what they consume. In practice, accurately forecasting demand is the key to success or failure.

Availability Payments vs. User Fees in Public-Private Partnerships

Knowing the main differences between availability payments and user fees helps you assess risk, revenue stability, and financing in public-private partnerships. 

The table below highlights these key points.

Lender and Investor Perspectives on Payment Models

To understand why availability payments and user fees matter in public-private partnerships, look at how lenders view them. Banks and institutional investors view these models through a risk-adjusted lens.

Why Lenders Prefer Availability Payments

From a lender’s perspective, availability payments feel familiar.
They look like:

• Long-term government-backed contracts
• Stable infrastructure bonds
• Predictable repayment schedules

This makes them easier to underwrite and securitize. Not surprisingly, many project finance courses emphasize availability-based PPPs as lender-friendly structures.

Why Equity Investors May Favor User Fees

Equity investors usually like the user fee approach for the following reason: upside.

If demand is more than what is expected:

• Returns can be outsized
• Concessions turn into cash machines

Projects with growing traffic volumes, such as airports or toll roads, may have equity IRRs significantly higher than projects based on availability. However, the increased risk does not put all investors off.

Political and Fiscal Implications of Infrastructure Payment Models

Not only does the payment model influence financial math, but it also influences voters, headlines, and the long-term level of public trust.

Public Acceptance and User Fees

User fees are transparent. Users are aware of tolls, prices, and congestion charges.

This can create:

• Political backlash: A consequence of requiring citizens to pay tolls or fares is a public outcry. Even the smallest toll or transport fee can become a big issue, especially if citizens and politicians believe it is unjustified or too expensive.
• Equity concerns: User fees can disproportionately affect disadvantaged groups, especially those who depend on these services. For example, tolls or transit fares can be a real financial strain for commuters with few other options, raising concerns about equity.
• Resistance to privatization: When private companies collect fees, some people see it as giving away public assets. This pushback can slow down project approvals, lead to more scrutiny, and result in tougher regulations, even if the project makes economic sense.

Even tolls that make economic sense can become politically unpopular.

Availability Payments and Budget Transparency

Availability payments help avoid political pushback by not charging drivers directly, but they also lead to long-term financial commitments that governments need to manage carefully.

• Long-term budget obligations: Availability payments usually last 15 to 30 years, so governments must keep paying them even if leadership or financial conditions change. This gives private partners a steady income, but the public sector must plan for these ongoing costs
• Annual appropriations: Governments usually pay availability payments from their yearly budgets. This means they must plan each year and decide which projects are most important. It makes public spending more transparent, but it can also reduce flexibility if the economy worsens or emergencies happen
• Off-balance-sheet commitments: Some availability-payment PPPs are structured so the government’s long-term commitments do not appear as official debt. This can make finances look better, but these are still real financial responsibilities that need to be reported and watched to prevent hidden risks.

When Availability Payments Make More Sense

The involved governments prefer availability payments when they require services to be provided continuously. Here are some reasons why availability models would work best in the above cases:

When demand for services is hard to forecast, as in new hospital facilities, schools, and rural transit services, it may be unclear. For example, in a hospital in a developing area, the number of patients may vary every year.

If the revenue can be traced to the facility’s use, the project's financial sustainability will be endangered. Due to the payment mechanism, the facility will remain operational, irrespective of the number of users.

Sometimes, governments aim to ensure everyone has access to essential services such as hospitals and schools, regardless of income. Charging fees can make it harder for some people to use these services. 

For example, a city bus system that doesn’t charge fares and is funded by availability payments lets everyone ride while private companies can still run the service well.

Some projects, like water treatment plants or public transit, need regular maintenance and investment to keep running. 

Availability payments make sure there’s enough money to cover these costs. This steady income helps operators keep service quality high without worrying about financial problems.

When User Fees Are the Better Choice

User-fee models are most effective when demand is steady and predictable, and the private partner can collect revenue directly from users. 
These conditions make user-fee structures more successful for several reasons:

• Demand is flexible but generally predictable. For example, toll highways or commuter rail lines often see high but steady use. A city expressway might have heavy traffic during rush hours that stays about the same each year
• Users are willing to pay fees when they see a clear benefit, such as saving time or enjoying more convenience. For instance, a tolled express lane lets drivers avoid traffic jams. Many commuters choose to pay for a quicker trip, making the toll worthwhile and helping the operator earn steady revenue
• User fees work best when there are not many other options. For example, an airport using a concession model can charge landing fees and passenger service charges because airlines and travelers have few other airports nearby. Having a few alternatives means usage stays steady and cash flow is reliable
• In most cases, the private sector finds ways in which it can build to generate revenue, even when it comes to user fees, such as in the case of a toll road owner using electronic tolling, pricing based on road traffic, or even a rewards system to attract more users during low-peak hours
   

Hybrid Models and Emerging Trends of Payment Models

Today, the PPP contract is typically structured as a combination of availability payments and user fees, intended to balance risks and create incentives for successful performance while shielding both the public and private sectors.

Examples of some typical hybrid strategies follow:

• Minimum revenue guarantees: In some toll road or transit schemes, the government guarantees a minimum revenue to the private party operating the scheme. For example, if a new toll road experiences less-than-expected traffic flow, the difference would be made up by the government
• Shadow tolls: Under shadow tolling, the government pays the private developer for the use of the service rather than the user. The developer is paid for each user of a particular service, such as a toll road, for example. This ensures that the service is efficient and free for everyone.
• Availability payments with demand-based bonuses: Some PPPs pay a base amount for making the service available, plus extra rewards if more people use it. For example, a private company operating a regional transit system might receive regular payments and also earn bonuses if ridership exceeds a certain threshold. This way, operators are rewarded for both reliability and attracting more users.

Conclusion

Choosing between availability payments and user fees in public-private partnerships depends on several factors, such as the type of infrastructure, how certain demand is, political considerations, and financing goals. There is no single solution that works for every situation.

Availability payments provide steady revenue, lower financing costs, and help attract lenders. This makes them a good fit for hospitals, schools, and other public services where access is important. User fees shift demand risk to the private partner and can lead to higher returns when usage is steady and predictable, like with toll roads or airports.

Many current PPPs use a mix of both models to balance risk, encourage good performance, and protect the public. By looking closely at how risks are shared, what each sector needs, and how money will flow, governments and private partners can create deals that are efficient, high-quality, and sustainable over time.

In the end, knowing the details of these payment models is important for anyone working in infrastructure finance, policy, or project management. Making the right choice affects not only the project’s success, but also public trust and the economy over time.

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