What an availability payment is and what it buys

In an availability-payment concession, a private consortium designs a piece of public infrastructure, builds it, raises the money to build it, then operates and maintains it for a fixed term, often twenty-five or thirty years. The public authority pays nothing while it is being built. Once the asset opens, the authority pays a set sum at set intervals for as long as the asset remains available to a standard written into the contract. At the end of the term the asset goes back to the authority.

The word availability is the whole of it. The payment does not rise when traffic is heavy and does not fall when it is light. It falls when a lane is shut, a lift is broken, a platform is unlit or a response time is missed. Users may still pay a toll, but if they do the toll goes to the authority, not to the partner.

Who carries the risk that nobody comes

This is the dividing line between the two families of concession. In a demand-risk deal, usually a toll concession, the private partner collects the revenue from users and lives on it. If the forecast traffic does not arrive, the partner's equity absorbs the loss, and several American toll concessions have gone through bankruptcy on exactly that. In an availability deal the authority keeps demand risk, because the authority is the one paying. What the partner still carries is the risk of building late, building badly, and of the asset breaking down later.

That allocation is chosen, not discovered. Demand risk suits an asset where use can be measured and priced and where a private forecast is worth something. Availability suits an asset where usage is not the point: a courthouse, a school, a water treatment works, a road nobody would accept a toll on.

What the payment covers after the ribbon is cut

The payment is a single line in a budget that covers at least four things at once: repayment of the construction debt, a return to the equity investors, the cost of running the asset day to day, and lifecycle renewal, meaning the planned replacement of the parts that wear out before the term is up. Most of the contract's years are operating years, and most of the work in those years is labour. The chart is a reminder of what that labour costs in one state: not the headline engineering that gets photographed, but the maintenance, the repairs, the cleaning and the moving of things.

Handback is the clause that makes lifecycle renewal real. The contract specifies the condition the asset must be in when it returns to public hands, and inspections in the final years decide whether it is. Without that clause a partner would have every reason to let the asset decay towards the end of the term, spending nothing it will not be around to regret.

Where the disagreement is

Supporters argue that paying only for performance, across decades, buys maintenance that public budgets never protect: a highway agency can defer resurfacing for a decade when the legislature is short, and a concessionaire facing deductions cannot. Critics answer that an availability payment is borrowing by another name, at a private cost of capital above what a government pays, and that it can be arranged so the obligation does not appear as public debt even though a future budget must honour it. Both points can be true at once, which is why the fight is usually about the counterfactual: whether the comparison is against a well-funded public works department or the one that actually exists.

The test to carry into the next announcement is a single question: what has to go wrong before the payment falls? If the answer is that traffic disappoints, this is a demand deal and the private partner is exposed. If the answer is that a lane stayed closed longer than the contract allows, it is an availability deal and the public is exposed to demand but protected on performance. If the answer is that nothing reduces the payment, somebody has sold a bond and called it a partnership.