What it means
Governments often need infrastructure faster than their budgets allow. In a partnership, a private consortium builds the asset using its own money and borrowed funds, then recovers its costs over many years through payments from the government or charges to users.
This spreads the cost over the life of the asset rather than requiring it all up front. The core idea is that risks are given to whichever party can manage them best.
The private partner usually takes construction and maintenance risk, meaning the risk of overruns, delays and poor build quality. The public body keeps risks it controls, such as changes in policy or planning approval.
There are several payment models. In an availability model, the government pays a regular fee as long as the asset is available and meets standards, while in a demand model the partner earns from users, such as through road tolls.
Contracts commonly run for 20 to 30 years, after which the asset may revert to the public body. Governments judge partnerships by value for money.
They compare the total cost of the partnership, adjusted for risk, with the cost of the government doing the project itself, often called the public sector comparator. A partnership is only worthwhile if it delivers a better result for the same or lower cost over its life.
Critics point out that private borrowing is usually more expensive than government borrowing, and that long contracts can be inflexible if needs change. Supporters respond that private discipline on cost and time and the transfer of risk can outweigh the higher financing cost.
Careful contract design, transparency and strong monitoring decide whether a project succeeds. For businesses, partnerships create opportunities in construction, facilities management, finance and engineering.
Participants must be comfortable with long project timelines, complex contracts and heavy scrutiny of how public money is spent.
In practice
Real-world examples
Example 1
A city needs a new toll bridge. A private consortium builds it for $300,000,000 and collects tolls for 30 years. The city avoids upfront borrowing, and the consortium bears the risk that traffic is lower than forecast.
Example 2
A regional health authority signs a 25-year agreement for a new hospital building. The partner builds it and maintains it, and the authority pays an annual fee that falls if parts of the building are unavailable. The authority provides the clinical services itself.
Example 3
A water utility works with a private company to build a desalination plant. The company finances the plant and sells water to the utility at an agreed price per cubic metre. The utility gets the plant without raising its own capital, and the private company carries the risk that the plant costs more to build than planned.
Think of it
Imagine you want to build a community swimming pool but cannot afford the materials or time to build it. You partner with a local builder who funds and constructs the pool, then charges a small entry fee for five years before handing full ownership over to you.
Formula
Calculation
Value for money saving = present value of public sector comparator cost - present value of partnership cost
Suppose the government estimates that building and running a hospital itself would cost $190,000,000 in present value terms, including an allowance for expected overruns. A private consortium offers to deliver it for payments with a present value of $178,000,000. The saving is 190,000,000 - 178,000,000 = $12,000,000, which is 12,000,000 / 190,000,000 = 6.3% of the comparator cost.Case study
Seen in the real world
Eastmere Council is an illustrative, fictional local authority that needed three new schools. Its capital budget could fund one school in the next five years, and the other two would have to wait.
The council signed a partnership in which a private consortium built and maintained all three schools and received a fixed annual payment for 25 years, reduced if classrooms were not available. The finance director found that the partnership cost 4% more in present value terms than building one school at a time, but delivered the schools six years sooner. The illustrative council judged the speed to be worth the extra cost, and it published the comparison so residents could review it.
Ten years into the contract, the council published an annual review showing that availability targets had been met in all but two months, with deductions of $85,000 taken from the payments. The illustrative review also noted that the schools would return to council ownership at the end of the term in good condition, which the contract required.
Watch out
Common mistakes
- Treating a partnership as free money, when the government still pays for the asset over time.
- Comparing only the headline cost and ignoring the risks transferred to the private partner.
- Signing a long contract without allowing for changes in needs, which can lead to expensive variations later.
Questions
People also ask
Is a public private partnership the same as privatisation?
No, in a partnership the public body usually remains the owner or the service commissioner, whereas privatisation transfers ownership to private hands.
Who takes the risk in a partnership?
The risks are shared, with each party taking those it can best control, such as construction risk for the private partner and policy risk for the government.
How long do these contracts last?
Typically for decades, often 20 to 30 years, to give the private partner time to recover its investment.