Infrastructure investing was once largely associated with roads, hospitals and schools, where revenues were backed by long-term government contracts and relatively predictable cashflows.
Mount Street executive director and head of infrastructure debt asset management Kieran Scullion.
These were often funded through the now-retired Private Finance Initiative contracts (PFIs) or early renewables whose revenues were 100% UK government subsidy backed.
Today, the opportunity set is much broader.
Data centres have emerged as the market’s standout growth story, fuelled by the rapid adoption of AI, while green transport and battery energy storage systems (Bess) are becoming increasingly attractive as the energy transition gathers pace.
It’s little surprise then, that one of the recurring themes at this year’s Infrastructure Investor Global Summit in Berlin was the changing definition of infrastructure.
As new sectors emerge, investors are naturally asking where infrastructure overlaps with adjacent asset classes and where the boundaries should sit.
That’s the wrong question.
The real challenge isn’t deciding what does or doesn’t qualify as infrastructure, it’s making sure the industry can embrace new opportunities without losing the investment discipline that has made the asset class a home for long-term institutional capital.
Broader opportunities mean a more robust approach to risk
When assessing risk on a potential investment beyond understanding a project’s immediate cashflow profile, lenders are increasingly focused on the long-term viability of the sectors they are financing and the potential for technological or competitive obsolescence.
Many of today’s infrastructure assets operate in much more competitive and sector-specific markets.
For instance, fibre operators need to build networks and attract customers, data centres must manage growing power demands, and Bess, renewable energy and hydrogen projects each have their own commercial dynamics.
The key question is not simply whether a project performs well today, but whether it will continue generating resilient revenues throughout the life of the loan.
Where there is a greater risk that an asset could be superseded by newer or more efficient technologies, lenders are responding by strengthening covenant packages, increasing financial headroom and introducing additional milestones or cash lock-up mechanisms later in the life of the facility to provide greater protection.
None of that makes these sectors less attractive.
They represent some of the most exciting opportunities in infrastructure today, but they also require investors to think differently about risk.
Financial models need to be stress-tested against a range of downside scenarios, not just the base case.
Investors are now keen to understand how an asset performs if revenues dip, costs rise or projects take longer than expected to complete.
That is particularly important in newer sectors, where investors cannot draw on decades of operational data or established performance benchmarks in the same way they could for more traditional infrastructure assets.
That discipline shouldn’t stop once a deal has completed either. Asset management has become just as important as underwriting.
Markets evolve, assumptions change and business plans need to be reassessed throughout an investment’s life, making continuous monitoring an increasingly important part of preserving long-term portfolio resilience.
In practice, that means investors are keeping a closer watch on operational performance, covenant compliance and changing market conditions so that emerging risks can be identified and addressed before they become credit issues.
Despite that, it’s important not to lose sight of the bigger picture that infrastructure remains one of the safest sectors for long-term institutional capital, as the assets are still essential and demand remains strong, the challenge for investors is balancing that growth with careful risk management.
Growth needs to be matched with discipline
The fibre market is probably the clearest example of why that balance matters.
A few years ago, fibre was one of Europe’s biggest infrastructure growth stories and there was a genuine opportunity to invest in digital connectivity with many operators delivering on that promise. Others have found the commercial reality much tougher than expected as construction costs increased and customer growth failed to match business plans.
The experience underscored a familiar lesson: attractive markets don’t compensate for speculative business planning. Revenue forecasts need to be challenged, and downside scenarios need to be tested properly in order to evaluate when market conditions become challenging.
Bess on the other hand, offers an interesting contrast where investors spent several years discussing optimal financing models for the sector long before wider scale funding occurred.
By the time institutional capital entered the market at scale, funding structures had been bottomed down, the economics were better understood and confidence had grown.
There are still challenges, particularly around grid capacity, but the market entered its growth phase on much firmer foundations.
That’s one of the biggest lessons from the past few years.
Experience has shown that long-term success relies on disciplined risk assessment, well-tested assumptions and projects that remain resilient as market conditions change.
There is certainly no shortage of opportunity.
Data centres continue to attract significant investment as demand for digital infrastructure accelerates, while Bess is gaining momentum across southern Europe.
Renewable energy refinancing remains active, offshore wind is becoming increasingly attractive as subsidy regimes improve, particularly in the UK, and hydrogen is beginning to mature into a more bankable asset class.
Each sector has its own characteristics and risk profile, which is exactly why the industry should spend less time debating whether they fit a traditional definition of infrastructure and more time assessing whether they can support resilient, long-term cashflows.
Ultimately, that is what will determine their place in infrastructure portfolios.
Looking ahead
The precise direction of infrastructure debt markets is difficult to predict. If the past five years have demonstrated anything, it is that geopolitical and economic events can reshape investment priorities remarkably quickly.
There is also a compelling case for a successor to the UK’s PPP model.
With public finances under increasing pressure but private capital continuing to seek long-term infrastructure opportunities. Creating a framework capable of attracting institutional investment into essential public infrastructure could unlock significant investment over the coming decade.
While the infrastructure opportunity set will continue to evolve, the fundamentals of successful infrastructure debt investing remain unchanged.
Long-term cashflow resilience, disciplined underwriting and active asset management have always underpinned the asset class, and they will remain just as important as new sectors emerge.
Success will depend not on redefining infrastructure or chasing the next growth story, but on applying those principles consistently, understanding risk before investment, monitoring performance throughout the asset’s life and ensuring portfolios remain resilient through changing market conditions.
By Mount Street executive director and head of infrastructure debt asset management Kieran Scullion.
