Infrastructure Investing

What counts as infrastructure

Investors usually group infrastructure by sector:

• Transport: toll roads, bridges, tunnels, airports, seaports, rail.
• Utilities and networks: electricity transmission and distribution, gas networks, water and wastewater.
• Energy and the energy transition: contracted renewable generation, storage, transmission links, midstream pipelines and storage.
• Digital infrastructure: towers, fibre networks and, depending on the investor, data centres.
• Social infrastructure: hospitals, schools, courts and housing delivered under long-term public contracts, often as a public-private partnership.

Sector is a weak guide to risk. A contracted solar farm and a merchant gas-fired plant are both energy infrastructure, but one sells power at a fixed price for years and the other sells at whatever the market pays. The more useful classification is the revenue model.

Revenue models

Many assets mix these. An airport may have regulated aeronautical charges and merchant retail income; a wind farm may have a fixed-price contract for the first years and merchant exposure afterwards. Diligence starts by splitting forecast revenue into these buckets for every year of the hold.

Risk spectrum: a market convention

Managers and investors describe infrastructure strategies as core, core-plus, value-add and opportunistic, the same labels used for real estate fund styles. The buckets are market conventions: each manager sets its own criteria and target returns in its fund documents.

• Core infrastructure: operating assets with regulated or long-term contracted revenue; return mainly from cash yield.
• Core-plus: mostly contracted or regulated, with some growth capex, contract roll-off or demand exposure.
• Value-add: repositioning, expansion, operational change, construction or more merchant exposure.
• Opportunistic: development platforms, distressed assets, emerging markets or mainly merchant revenue.

Development stage cuts across these buckets. A greenfield project carries construction and ramp-up risk; a brownfield asset has an operating history.

Equity, debt and access routes

Capital reaches infrastructure through equity, mezzanine and debt instruments, structured either as project finance (a ring-fenced asset repaid from its own cash flows) or as corporate finance (a company that owns several assets), and held directly or through funds. The 2015 taxonomy of infrastructure financing instruments that the Organisation for Economic Co-operation and Development (OECD) prepared for the G20 is organised along these same three lines.

• Unlisted equity: closed-end funds, open-end funds, direct ownership and co-investment.
• Infrastructure debt: senior and junior loans and bonds, sized on contracted or regulated cash flows.
• Listed infrastructure: shares of listed utilities, toll-road and tower companies, and in the US master limited partnerships in midstream energy. Listed shares are priced daily by the market, so their volatility is not comparable with the appraisal-based NAVs of unlisted funds.
• Regulated long-term vehicles: in the EU the European long-term investment fund (ELTIF) and in the UK the long-term asset fund (LTAF) can hold infrastructure alongside other long-term assets.

Why investors allocate, and what goes wrong

Pension funds and insurers use infrastructure to hold long-dated income that can be matched against long liabilities (asset-liability management). For EU insurers, Solvency II recognises a qualifying infrastructure investment category (Article 164a of Delegated Regulation (EU) 2015/35) whose criteria include cash flows that allow all financial obligations to be met under sustained stresses, predictable cash flows to debt and equity investors, and a regulatory or contractual framework that gives those investors a high degree of protection. When the category was introduced in 2016 its equity stress was calibrated at 30%, inside the 30% to 39% range that the European Insurance and Occupational Pensions Authority (EIOPA) had advised. Delegated Regulation (EU) 2026/269 amends the Delegated Regulation's equity risk provisions, among others, from 30 January 2027.

The main ways the thesis fails:

• Inflation linkage is contractual, not automatic. Indexation clauses can be capped, lagged or partial, and regulators can reset allowed returns.
• Discount-rate sensitivity. Long-dated cash flows are valued by discounted cash flow; a higher discount rate lowers value even when cash flows are unchanged.
• Political and regulatory risk. Governments plan, fund and regulate infrastructure across its life cycle (the subject of the OECD's 2020 Recommendation on the Governance of Infrastructure), so policy change is a direct risk to the owner.
• Leverage and refinancing. Stable assets often carry high debt; refinancing at higher rates can absorb much of the equity return.
• Obsolescence and transition. Demand for some assets (for example gas networks) depends on energy policy.

How LPs classify and measure it

LPs place infrastructure in a real assets bucket, as a standalone allocation, or split it: value-add equity alongside private equity and senior debt alongside fixed income or private credit. Closed-end funds are measured with IRR, a money-weighted return, and with the total value to paid-in (TVPI) and distributions to paid-in (DPI) multiples; open-end funds usually report time-weighted NAV returns. Appraisal-based NAVs move less than listed prices, so reported volatility and correlation understate economic risk (see return smoothing).

Not the same as

• Real Assets: Real assets is the broader bucket: real estate, infrastructure and natural resources. Infrastructure is the part whose revenue comes from providing an essential service rather than leasing space or selling a commodity.
• Real Estate (Asset Class): Real estate earns rent for space under leases; infrastructure earns regulated, contracted or user charges for a service. Data centres and some social assets sit on the boundary and are classified by their contracts.
• Infrastructure Debt: Infrastructure investing usually refers to equity ownership with a residual claim. Infrastructure debt lends to the same assets for contractual interest and repayment.
• Natural Resources: Natural resources returns depend on extracting and selling commodities. Midstream assets that transport or store them are treated as infrastructure when revenue is fee-based or contracted.

How it is classified

• Classify an asset as infrastructure when it delivers an essential service through long-lived physical assets or networks and most of its revenue is set by regulation, long-term contract or concession, or it has monopoly-like demand. Sector alone does not decide it.
• Place a strategy on the core-to-opportunistic spectrum by its revenue mix, development stage, leverage and expected share of return from income versus growth and exit, using the manager's stated criteria.

Common mistakes

• Treating infrastructure as a single risk level. A regulated water utility and a merchant power plant under construction are both infrastructure; their risks differ greatly.
• Assuming inflation protection without reading the indexation clause or the regulatory formula.
• Presenting core, core-plus or value-add return ranges as industry standards. They are each manager's own targets.
• Comparing the volatility of an unlisted fund's appraisal-based NAV with the volatility of listed infrastructure shares.
• Classifying an asset by sector (for example, all data centres or all renewables) without checking contract tenor, counterparty and merchant exposure.

Edge cases

• A concession asset has no terminal value to the owner if it reverts to the grantor at the end of the term; valuations must stop the cash flows at expiry.
• A renewable project with a 15-year contract inside a 30-year life becomes partly merchant when the contract ends.
• A regulated network with a large approved capex programme grows its asset base; whether that is core or core-plus depends on how the manager defines the buckets.

Questions

External standards

Sources

1. Commission Delegated Regulation (EU) 2016/467 amending Delegated Regulation (EU) 2015/35 concerning the calculation of regulatory capital requirements for several categories of assets held by insurance and reinsurance undertakings. Official Journal of the EU, L 85, 1.4.2016, p. 6, Adopted 30 September 2015; published OJ L 85 of 1 April 2016; in force the day after publication (Art 3). Status: In force as part of Delegated Regulation (EU) 2015/35, which has been amended since (checked 2026-10-01). Art. 1(1) inserting Art. 1(55a)-(55b); Art. 1(4) inserting Art. 164a; recital 15 — supports: Infrastructure assets definition and qualifying infrastructure category as introduced in 2016; 30% equity stress chosen within EIOPA's advised 30%-39% range
2. Directive 2009/138/EC on the taking-up and pursuit of the business of Insurance and Reinsurance (Solvency II). European Parliament and Council, Official Journal of the EU, L 335, 17.12.2009, Adopted 25 November 2009; applied from 1 January 2016 (as amended by Omnibus II, Directive 2014/51/EU). Status: In force; amended by Directive (EU) 2025/2 (checked 2026-10-01). Arts. 100-127 (Solvency Capital Requirement) — supports: Capital charges affect EU insurers' allocations to infrastructure
3. Infrastructure Financing Instruments and Incentives (Mapping of Instruments and Incentives for Infrastructure Financing: A Taxonomy). OECD (R. Della Croce et al.), OECD, September 2015, report to G20. Status: Published (checked 2026-10-01). Table 1, pp. 11-12 — supports: Infrastructure financing by instrument (debt, mezzanine, equity), structure (project vs corporate) and route (direct vs fund)
4. Public-Private Partnerships Reference Guide, Version 3. World Bank Group with multilateral partners, World Bank, Version 3, 2017. Status: Current edition; online version maintained on the PPP Knowledge Lab (checked 2026-10-01). PPP definition; payment mechanisms — supports: User-pays vs government-pays revenue and availability payments in PPPs
5. Recommendation of the Council on the Governance of Infrastructure (OECD/LEGAL/0460). OECD Council, OECD, Adopted 17 July 2020. Status: In force (checked 2026-10-01). Ten governance dimensions across the asset life cycle — supports: Governments plan, prioritise, fund, deliver, operate and monitor public infrastructure across its life cycle
6. PS21/14: A new authorised fund regime for investing in long term assets. Financial Conduct Authority, FCA, October 2021 (published 25 Oct 2021). Status: Final policy; rules effective 15 November 2021 (checked 2026-10-01). Para. 1.2 — supports: LTAF is an authorised open-ended fund for long-term illiquid assets, including infrastructure
7. Commission Delegated Regulation (EU) 2017/1542 amending Delegated Regulation (EU) 2015/35 concerning the calculation of regulatory capital requirements for certain categories of assets held by insurance and reinsurance undertakings (infrastructure corporates). European Commission (Official Journal of the EU), Adopted 8 June 2017; CELEX 32017R1542. Status: in force (checked 2026-10-02). Art. 1(1) (replacing Art. 1(55a)-(55b)); Art. 1(2) (replacing Art. 164a(1)) — supports: Current wording of the infrastructure assets definition and of the qualifying infrastructure criteria
8. Commission Delegated Regulation (EU) 2026/269 amending Delegated Regulation (EU) 2015/35 (Solvency II review: technical provisions, long-term guarantee measures, own funds, equity risk and other matters). European Commission (Official Journal of the EU, L series 2026/269, 18.2.2026), Adopted 29 October 2025; published 18 February 2026; applies from 30 January 2027. Status: adopted, not yet applicable (checked 2026-10-02). Final article (applies from 30 January 2027); Art. 1 (equity risk amendments) — supports: Amendments to Delegated Regulation 2015/35, including equity risk, apply from 30 January 2027
9. Regulation (EU) 2023/606 amending Regulation (EU) 2015/760 (ELTIF 2.0). European Parliament and Council, Official Journal of the EU, L 80, 20.3.2023, Adopted 15 March 2023; applies from 10 January 2024. Status: In force (checked 2026-10-01). Recital (6); Art. 1(2)(a) (replacing Art. 2(6) of Regulation (EU) 2015/760) — supports: ELTIFs may invest in real assets, which include communication, energy, transport and social infrastructure

• Project Finance
• Public-Private Partnership (PPP)
• Real Estate (Asset Class)
• Real Assets
• Core Infrastructure

• Alternative Investments (Alternative Assets)
• Private Capital (Private Markets)
• Sovereign Wealth Fund (SWF)