The two flavours
Almost every Australian PPP is one of two shapes. Both move a cost off today's budget and onto tomorrow's public.
User-pays (concession)
The consortium builds a toll road, port or airport and is granted the right to charge you directly for 30–99 years. The government's "cost" looks like zero — because the bill is sent straight to the public as tolls and fees. Escalation is written into the contract.
Availability payments
For a hospital, school, prison or light-rail line where you can't easily charge a toll, the government instead pays the consortium a fixed annual "availability payment" for 25–30 years to build it and keep it running. It's a mortgage — but one kept off the balance sheet and indexed to inflation.
Either way, a cost that could have been funded by cheap government borrowing and owned by the public forever is instead financed by private investors who must be paid a profit — every year, for a generation.
The cost-of-capital gap: the whole game in one idea
This is the single most important fact about PPPs, and the one most carefully avoided in the marketing.
The pitch
"Private financing brings discipline and expertise the public sector lacks, and takes the construction risk off the taxpayer. It pays for itself."
The arithmetic
A government can borrow for ~30 years far more cheaply than any company. Private equity in a PPP typically demands an 8–15% return. Someone must pay that gap for decades — and that someone is you.
A sovereign government is the cheapest borrower in its own currency — it can raise 30-year money at a few per cent. A private consortium borrows at more, and its equity investors expect a double-digit return on top. Over a 30-year contract that difference compounds into a very large number. The efficiency the private operator brings would have to be enormous — larger than almost any study has ever found — just to break even against that gap.
"But it's off the government's books, so it's free." It isn't free — it's deferred and hidden. Accounting rules that once let governments keep PPP liabilities off the balance sheet are exactly why politicians love them: the ribbon gets cut now, the bill falls due long after they've left office. The debt is real; it's just wearing a costume.
"Risk transfer": the magic word
The entire value-for-money case for a PPP rests on risk transfer — the claim that private investors, not the public, carry the danger of cost blowouts, delays and low demand. On paper it justifies the higher price. In practice, Australia has repeatedly shown that the risks that matter most flow back to the public when things go wrong:
- Demand risk evaporates on failure. When traffic forecasts proved to be fantasy, private toll operators went into receivership — but the road itself, a genuine public monopoly, kept charging tolls under new owners. The public never got the "risk-transfer" discount; it just paid the tolls anyway. See the busted toll roads →
- Essential services can't be allowed to stop. When a PPP hospital operator hits trouble, government cannot let the hospital close — so it must step in. The "risk" was never really the private partner's. See the PPP hospitals →
- Renegotiation is the norm. Concessions get re-cut, extended and topped up when the private side underperforms — often behind the "commercial-in-confidence" curtain, so you never see what was given away. See the secrecy →
Risk that's real is priced dearly and then handed back at the first sign of trouble. Risk that's illusory is used to justify the premium. Heads they win; tails you pay.
Why governments do it anyway
If it's so expensive, why is it everywhere? Because the incentives of the people signing the deal are not the incentives of the public.
- Budget optics. A PPP moves capital spending off this year's books, flattering the deficit and protecting a credit rating — while committing the public to decades of payments.
- Ribbon-cutting now, bills later. The politician who signs gets the opening; the public gets the 30-year invoice. Term lengths are chosen so the reckoning lands after the election, sometimes after a career.
- A one-off cash windfall. Selling or leasing an existing asset — a port, a land registry, an electricity network — books a giant one-time number the government can spend now, surrendering a reliable public income stream forever. See the sell-off →
- The revolving door. The advisers, bankers and executives who design and buy these deals, and the officials and ministers who approve them, move between those worlds. See who cashes in →
The tell: a 99-year lease is a sale you can deny
Politicians learned that voters hate the word "privatisation." So the same thing is now done under friendlier names — a 99-year lease, a concession, a partnership, an asset recycling programme. A 99-year lease on a port or an airport is, for any human lifetime, a sale. Calling it a lease just lets a government take the cash and deny it sold the family silver.
A public asset is a machine that quietly returns money to the public forever. Selling it for a lump sum is like burning the furniture to feel warm tonight — and then renting your own furniture back, at a price you no longer control. — the recurring shape of every page on this site
Next: how that furniture gets rented back to you with your own compulsory super, or start with the flagship case — the toll roads. Foundational reading and citations on Sources.