What if the infrastructure almost paid for itself?

Two very different ways to "pay for itself"

Before the numbers, an honest distinction, because everything rests on it. A project can "pay off" in two ways that must never be confused.

The first is the value it returns to the community: healthier people, who cost the healthcare system less and work longer. This value is enormous, but it is diffuse — it doesn't land in the network's bank account. It justifies the public investment and repays it in well-being, not in a bank deposit.

The second is the real money the network collects: the rents from the optical fibre, the hosting of cellular antennas, the fee from Hydro-Québec, the delivery contracts. Those are genuine revenues, which directly lighten the bill.

Both point in the same direction. The first is the larger; the second is the more concrete. Let's look at each in turn.

1. What the network saves society

Taking tens of thousands of once-sedentary people underground means getting them to pedal in all four seasons. And electric assist changes nothing essential here: the research — including the studies catalogued by the Montreal Heart Institute — confirms that e-biking remains a moderate-to-vigorous physical activity, enough to move a person from "sedentary" to "active". And regular physical activity acts on almost everything: fewer cardiovascular diseases, less diabetes, less depression, better sleep. At scale, this translates into care avoided for the healthcare system, but also into a population that takes less time off work, stays more productive and lasts longer in their jobs before illness pushes them out.

Following the logic of the World Health Organization's HEAT tool — the international standard for quantifying the health benefits of cycling, which assesses e-bikes as a category in their own right — and with a conservative assumption of converting 50,000 sedentary users into genuinely active people, only a fraction of the ridership the network targets (200,000), the cumulative value of these effects over fifty years falls in the order of $5 to $8 billion Canadian dollars. The scientific foundation is solid: the largest study of its kind, conducted on 264,000 Britons and published in the BMJ, links bike commuting to roughly 41% fewer premature deaths, 45% fewer cancers and 46% less heart disease.

These amounts are estimates, not promises — like every figure on this site, they are orders of magnitude, to be refined by a dedicated study. But their scale is robust: three independent methods — valuing avoided mortality (the HEAT approach), the value per kilometre travelled measured in Copenhagen and the Benelux, and the Canadian costs of physical inactivity — converge on the same conclusion: over half a century and at the scale of a region, prevention through physical activity runs into the billions. The sources are at the foot of the page.

2. What the network earns on its own

Now to the very real money. The tunnel is dug once, but it can serve many times over. The same 150 km corridor that carries bikes can host the region's vital networks — and charge them for it. That's the whole subject of the Other uses page; here is its scope over fifty years.

In a more optimistic scenario, these rents climb toward $30M a year — nearly $1.5 billion over fifty years. And two more levers stack on top, without appearing in the table:

• Hydro-Québec's one-time contribution. Burying a power line is very expensive per kilometre. If the tunnel spares Hydro from digging its own trenches, the saving for Hydro runs into the tens, even hundreds of millions — which could take the form of a direct contribution to construction. This is perhaps the project's most powerful financial lever, and the most dependent on a negotiation.
• Underground parcel delivery — the most promising lever. Beneath the path, a gallery of small robots can charge couriers, pharmacies, grocers and merchants for access to the network (see Drone delivery). The "last mile" is the most expensive part of any delivery; automating it underground at the scale of a region opens up a colossal market — this revenue could be enormous. But precisely because it is still impossible to estimate reliably, we leave it out of the total. Its absence actually makes our sum all the more conservative: the real figure can only be higher.

The sum

Let's put the three magnitudes side by side. On the left, what it takes to build the network. On the right, what society recovers and what the network collects, over half a century.

What "self-financing" means — and does not mean

Let's be precise, because the nuance is what makes the argument credible. "Self-financing" does not mean the network can be built without putting up any money: construction requires initial financing — public borrowing, partnership, subsidy. What the figures show is that this money is recovered over the life of the structure: in value for the community, and partly in very real revenue.

Likewise, the health value is not a cheque you cash: it's a cost you avoid, spread over hundreds of thousands of people and over fifty years. It doesn't repay the bill at the counter, but it radically changes the calculation: it justifies the public investment far beyond what a simple cycle path could. Finally, the network's routine maintenance remains a separate annual expense, which the revenues above and, if needed, a modest subscription can cover.

The conclusion holds despite these caveats, and that's what makes it strong: an underground cycling network is not a financial black hole, but an investment that, over its lifetime, largely pays for itself — through the health it creates and the revenue it generates, before charging a single user a cent.