Listed Infrastructure: The Inflation-Linked Real Asset for Every Portfolio

Infrastructure is the physical fabric that makes economies function. Airports, toll roads, utilities, schools built under public-private partnerships, water treatment plants, and increasingly, digital infrastructure such as data centres and fibre networks — these assets share characteristics that make them attractive to long-term investors: essential services, limited competition, contractual revenues, and long asset lives.

For most of investment history, infrastructure was the preserve of large institutional investors: pension funds, sovereign wealth funds, and infrastructure-specialist private equity. The minimum investment size, illiquidity, and governance complexity placed direct infrastructure ownership beyond individual investors.

Listed infrastructure changes this. By investing in companies that own and operate infrastructure assets — or in closed-ended investment trusts that hold infrastructure directly — investors can access many of the same economic characteristics with daily liquidity and no minimum investment beyond the price of one share.

What counts as listed infrastructure?

The listed infrastructure universe is broader than the term suggests. It encompasses:

Regulated utilities. Companies providing electricity, gas, and water distribution under regulatory frameworks that govern the returns they can earn. UK examples include National Grid, Severn Trent, and United Utilities. In the US, American Electric Power and Duke Energy. In France, EDF. Returns are largely predictable but constrained by regulators.

Toll road operators. Companies that own and operate motorways, bridges, and tunnels under long-term concession agreements. Transurban in Australia, Vinci in France, Getlink (formerly Eurotunnel), Ferrovial. (Note that some former listed operators have been taken private — Italy's Atlantia, for example, was delisted in 2022 and rebranded as Mundys.) Revenues often have built-in inflation escalation mechanisms.

Airport operators. Airports are natural monopolies — passengers cannot choose a competing airport in most cases. Operators charge airlines landing fees and passengers terminal fees, often linked to inflation. Groupe ADP (Paris), Fraport (Frankfurt), Auckland Airport.

Listed data centre REITs. Digital infrastructure — data centres, mobile towers, fibre networks — is increasingly classified alongside traditional infrastructure. Equinix, Digital Realty, American Tower, Crown Castle are large-cap listed companies whose revenues share many characteristics with traditional infrastructure: long-term contracts, essential services, inflation linkage.

Social infrastructure investment trusts. These are closed-ended UK investment trusts that invest in PPP/PFI projects: schools, hospitals, courts, defence infrastructure. HICL Infrastructure and International Public Partnerships (INPP) are the largest examples. The assets are typically long-term contracts with government bodies, providing highly predictable cash flows.

Renewable energy infrastructure. Wind farms, solar parks, and battery storage owned by listed vehicles. Greencoat UK Wind, Renewables Infrastructure Group (TRIG), Gore Street Energy Storage. Revenues often include contracted prices (Contracts for Difference in the UK) alongside merchant power prices.

The investment characteristics of infrastructure

Contractual, predictable cash flows. Infrastructure assets typically earn revenues under long-term contracts or regulatory agreements. A 30-year PPP contract to operate a school or hospital has extremely predictable annual income. A toll road with inflation-linked escalation clauses has revenues that grow automatically with the price level.

Inflation linkage. This is one of infrastructure's most valued properties. Many infrastructure revenues are explicitly linked to CPI or RPI: toll charges, regulated utility returns, social infrastructure contract payments. When inflation rises, infrastructure revenues typically rise too. This is different from equities, which may or may not benefit from inflation depending on pricing power, and from nominal bonds, which are directly harmed by inflation.

Low correlation with broader equities. The cash flow profile of infrastructure — contracted, predictable, not sensitive to economic cycles — means that its valuation is less dependent on GDP growth than equities. A toll road earns similar revenues in a mild recession as in an expansion. This low cyclical sensitivity provides genuine diversification.

Long asset life. Infrastructure assets often have useful lives of 30-50 years or more. This creates a natural match with the long-term investment horizons of pension funds — and with the long-term goals of individual investors saving for retirement.

Limited competition. Most infrastructure benefits from natural monopoly characteristics. There is typically only one motorway between two cities, one airport serving a regional hub, one set of electricity distribution cables to a neighbourhood. This structural protection reduces competitive risk.

UK investment trusts: the primary listed infrastructure vehicle

In the UK, the most direct access to unlisted infrastructure assets via a listed vehicle comes through closed-ended investment trusts. These trusts raise capital, invest in infrastructure assets (often PPP/PFI projects), and distribute income to shareholders.

HICL Infrastructure is one of the longest-established and largest UK infrastructure investment trusts, managed by InfraRed Capital Partners. It invests primarily in demand-based and availability-based infrastructure projects including hospitals, schools, transport, and utility assets. Historically provided dividend yields of 5-6% with CPI linkage.

International Public Partnerships (INPP), managed by Amber Infrastructure, focuses on social infrastructure and environmental infrastructure across the UK, Europe, and Australia. Projects include Thames Tideway Tunnel, offshore electricity transmission, and various government-backed social assets.

Sequoia Economic Infrastructure Income Fund invests in infrastructure debt rather than equity — loans secured against infrastructure assets. This creates a different risk profile (more defensive, fixed income-like) with yields typically above corporate bonds.

Primary Health Properties and Assura invest in GP surgery and primary care buildings, leased to NHS tenants on long-term leases. These are classified as REITs but share many infrastructure characteristics: government-backed tenants, long leases, inflation-linked rents.

The premium/discount dynamic

Closed-ended investment trusts trade on the stock exchange at a price per share that may be above or below their net asset value (NAV). When investor sentiment is positive and demand for infrastructure exposure is high, trusts trade at a premium to NAV — shares cost more than the underlying assets are worth on paper. When sentiment deteriorates, trusts trade at a discount.

The 2022-2023 rising rate environment drove most UK infrastructure investment trusts to significant discounts to NAV. The higher interest rates used to discount future cash flows reduced NAV estimates, and investor enthusiasm for the asset class diminished. By 2025-2026, many trusts were trading at discounts of 10-20% to stated NAV — which represents a potential opportunity if you believe the NAV estimates are reasonable and interest rates stabilise.

Buying an infrastructure trust at a 15% discount means you are acquiring infrastructure assets below their stated value, with a potential re-rating opportunity if the discount narrows back to par.

The rising rate headache: understanding the discount rate effect

The most important risk to understand in listed infrastructure — and the one that surprised many investors in 2022 — is the interest rate sensitivity of long-duration cash flows.

Infrastructure assets generate cash flows over very long periods: 30, 50, 100 years in some cases. The present value of distant future cash flows is extremely sensitive to the discount rate (interest rate) used to calculate them. When discount rates rise by 2-3 percentage points (as they did from 2021 to 2023), the present value of those distant cash flows falls substantially.

This means that even though the underlying assets are earning their inflation-linked revenues perfectly as expected, the stated NAV of an infrastructure trust can fall materially when interest rates rise. This is a valuation effect, not a cash flow impairment — the asset keeps earning its contracted revenues. But it affects the share price.

The result in 2022-2023 was counterintuitive: inflation rose sharply (which should have been positive for infrastructure via revenue linkage), but infrastructure investment trust prices fell because the rise in interest rates dominated the inflation benefit through the discount rate effect.

Investors who understood this dynamic were not surprised. Those who bought infrastructure purely as an "inflation hedge" without understanding the rate sensitivity were caught off guard.

Infrastructure ETFs: the international option

For investors who want infrastructure exposure via a straightforward ETF rather than individual trust selection, several options are available:

iShares Global Infrastructure UCITS ETF tracks companies involved in utilities, energy infrastructure, and transport globally. Includes utilities, airports, toll roads, and pipeline companies. Expense ratio approximately 0.65%.

Invesco Global Listed Private Equity ETF includes some infrastructure exposure. Various providers offer "global infrastructure" ETFs with differing constituent definitions.

The advantage of ETFs is simplicity and broad diversification. The disadvantage versus investment trusts is that ETFs hold listed companies (Transurban, National Grid, Getlink) rather than direct infrastructure assets, which introduces more equity-market correlation and less pure infrastructure exposure.

Building an infrastructure allocation

Infrastructure typically represents 5-10% of a diversified long-term portfolio. The allocation can be constructed through a combination of:

• A global listed infrastructure ETF for broad, low-cost exposure
• One or two UK infrastructure investment trusts (HICL, INPP) for direct asset exposure and income
• Renewable energy trusts (Greencoat UK Wind, TRIG) if ESG alignment is a priority
• A social infrastructure-focused trust (Primary Health Properties) for defensive government-backed income

The inflation-linkage, income characteristics, and diversification benefits make infrastructure a genuine portfolio complement rather than a redundant addition. The key is understanding the interest rate sensitivity and sizing the allocation to a level where discount rate volatility does not create unacceptable drawdowns.

How Global Investments can help

Our investment advisers can help you assess the role of listed infrastructure in your portfolio. We can guide you through the UK investment trust universe — analysing NAV discounts, dividend coverage ratios, and interest rate sensitivity across HICL, INPP, Sequoia, and specialist renewable energy vehicles — and help you build an infrastructure allocation appropriate for your income objectives, risk tolerance, and tax situation. Contact us for a portfolio consultation.