Private Markets Pathway · Infrastructure

Due Diligence and Valuation of Infrastructure Investments

Updated 8 October 2026 · Fact-checked

Infrastructure valuation mostly uses discounted cash flow: forecast long-life, often contracted cash flows, then discount them at a rate matching their risk. Due diligence tests the forecasts first: contracts, regulation, construction, operations, financing, ESG and tax. Then you value, test sensitivities, and tie the result to the client's needs.

Understand Due Diligence and Valuation of Infrastructure

Infrastructure assets are long-lived, capital-heavy assets such as toll roads, airports, pipelines, utilities, renewables and data networks. They often have monopoly-like positions and cash flows set by contracts or regulation. Most are not traded often, so you cannot read a price off a screen. You estimate value.

Due diligence comes before valuation because a DCF is only as good as its inputs. You check what drives the cash flows. For a greenfield asset, the main concerns are permits, construction cost and delay, and whether demand will appear. For a brownfield asset, the main concerns are the condition of the asset, the remaining contract or concession life, the regulatory reset risk and the need for future capital spending.

Typical due diligence areas are:
- Legal and contractual: concession terms, offtake or availability payments, termination clauses, change-in-law protection.
- Regulatory and political: tariff setting, reset periods, expropriation or tax-change risk.
- Technical and operational: asset condition, maintenance capex, operator quality, construction contractor and fixed-price terms.
- Commercial: demand forecasts, counterparty credit, pricing or inflation linkage.
- Financial: leverage, debt maturity, covenants, refinancing and interest rate hedging.
- ESG, environmental and tax: stranded-asset risk, climate exposure, community issues, tax structure.

In a DCF, you forecast free cash flows to the firm or to equity over the asset's life or a long explicit period. You discount at a rate that reflects the risk of those cash flows. Contracted, inflation-linked cash flows with a strong counterparty deserve a lower rate than merchant (market-priced) cash flows or construction-phase cash flows. A lower-risk operating asset is not the same as a project still being built, so use different rates by phase and by risk if the risks differ.

Terminal value needs care. A concession ends on a fixed date and may return the asset to the grantor, so the terminal value can be zero or small. An asset with an indefinite life, such as a regulated utility, can have a terminal value based on a growth rate or a regulatory asset base multiple. Because value is so sensitive to the discount rate, terminal assumptions and capex, you run scenarios and sensitivities rather than rely on one number.

Key rules to remember

Present value of the asset (DCF): Value = Σ CFt ÷ (1 + r)^t + TV ÷ (1 + r)^N; CFt is forecast cash flow, r is the risk-matched discount rate, TV is terminal value at year N. Use cash flows and rate that match (firm with WACC, equity with cost of equity).
Terminal value (growing perpetuity): TV at N = CF(N+1) ÷ (r − g); Only valid for r > g and for assets with indefinite life. For a fixed-term concession, use the remaining cash flows or the expected residual value instead.
Free cash flow to the firm (simple form): FCFF = EBITDA − taxes − capex ± change in working capital; Include maintenance and expansion capex. Infrastructure assets need steady reinvestment, so ignoring capex overstates value.
Discount rate build-up (equity): r = risk-free rate + risk premium for the asset's risks; Raise the premium for construction, merchant, regulatory, country and leverage risk. Lower it for contracted, inflation-linked, creditworthy counterparties.
Weighted average cost of capital: WACC = E/V × re + D/V × rd × (1 − t); Use for FCFF. Leverage in infrastructure is often high and changes over time, so check whether a constant weight is realistic.

How to solve Due Diligence and Valuation of Infrastructure questions

Use this order for any due diligence or valuation question on infrastructure. It keeps your answer tied to the facts in the vignette.

1Identify the asset stage and type: greenfield or brownfield, regulated, contracted or merchant, and the remaining life.
2Read the command word. Is it asking you to identify risks, recommend diligence, choose a discount rate, or calculate value?
3Pick the diligence areas that matter for that asset: contracts, regulation, construction, operations, demand, financing, ESG, tax.
4Choose cash flows and a matching discount rate. Tie a higher rate to higher risk, such as construction or merchant exposure.
5Set the terminal treatment: perpetuity for indefinite life, zero or residual value for a fixed-term concession.
6Calculate step by step, showing each present value and the sum. Then run or discuss a sensitivity to rate, growth and capex.
7State the conclusion in one sentence and link it to the investor's objective, such as stable income or inflation protection.

Quickest way: Risk-to-rate shortcut

When to use it: Use it when a question asks which asset or phase deserves a higher or lower discount rate, or how a diligence finding changes value.

Label each cash flow: contracted, regulated or merchant; operating or construction.
Rank the risk: construction and merchant highest, regulated and contracted operating lowest.
Assign the higher rate to the riskier cash flows. Keep the answer to one reason per point.
Say the direction of value: a higher rate or lower cash flow lowers value; a longer contract or inflation link supports value.
If numbers are given, discount each year, sum, and add the discounted terminal value only if the asset continues beyond the forecast.

Common mistakes in Due Diligence and Valuation of Infrastructure

Using one discount rate for every phase of a project.
A single WACC feels simpler and many textbook examples use it.
Fix: Use a higher rate for construction-phase or merchant cash flows and a lower rate once the asset operates under stable contracts, if the question gives different risks.
Adding a perpetuity terminal value to a fixed-term concession.
Students apply the standard DCF template without checking the asset's life.
Fix: Read the concession end date. If the asset reverts to the grantor, use zero or the stated residual value.
Ignoring maintenance and replacement capex in cash flows.
EBITDA looks stable and attractive, so it gets treated as cash flow.
Fix: Deduct capex needed to keep the asset operating before discounting.
Listing generic due diligence items without linking to the asset.
Memorised checklists feel safe.
Fix: Pick the few items that fit the vignette, such as demand risk for a toll road or tariff reset for a regulated utility, and say why each matters.
Mixing cash flows and discount rates, such as discounting equity cash flows at WACC.
Both rates are in the formula sheet and look interchangeable.
Fix: Match FCFF with WACC and FCFE with cost of equity.
Treating the DCF result as precise.
A single number looks authoritative.
Fix: Mention sensitivity to rate, growth and capex, and that valuation of unlisted assets relies on estimates.

Worked examples

Example 1

A brownfield toll road has a concession with 3 years remaining, after which the asset reverts to the government with no payment. Expected free cash flows to the firm are 40, 42 and 44 (in millions) at the end of years 1, 2 and 3. The discount rate is 8%. What is the value of the asset, and why is there no terminal value?

Show the solution

The concession is fixed term and reverts at no payment, so terminal value is zero.
PV of year 1 = 40 ÷ 1.08 = 37.037.
PV of year 2 = 42 ÷ 1.08² = 42 ÷ 1.1664 = 36.008.
PV of year 3 = 44 ÷ 1.08³ = 44 ÷ 1.259712 = 34.928.
Sum = 37.037 + 36.008 + 34.928 = 107.973.

Answer: Value is about 108.0 million. There is no terminal value because the concession ends at year 3 and the asset reverts with no payment.

Example 2

An investor values a regulated utility whose free cash flow to the firm next year is 50 million. The cash flow is expected to grow at 2% a year indefinitely. Due diligence finds a tariff reset risk, so the investor uses a 7% discount rate instead of 6%. Calculate the value at each rate and explain the effect of the finding.

Show the solution

Use the growing perpetuity: Value = CF1 ÷ (r − g).
At 6%: 50 ÷ (0.06 − 0.02) = 50 ÷ 0.04 = 1,250.
At 7%: 50 ÷ (0.07 − 0.02) = 50 ÷ 0.05 = 1,000.
Change = 1,000 − 1,250 = −250, which is a 20% fall (250 ÷ 1,250).

Answer: Value is 1,250 million at 6% and 1,000 million at 7%. The higher rate reflects the tariff reset risk and lowers value by 250 million, or 20%, showing how sensitive infrastructure value is to the discount rate.

Exam tips

Match the diligence points to the asset in the vignette. Two or three well-linked points earn more than a long generic list.
Show every discounted cash flow and the sum. A correct final number alone earns full credit on a calculation, but working protects you if you slip.
Check the concession life before adding terminal value. This is a common trap.
When asked to justify a rate, name the risk and the direction: for example, merchant exposure means a higher rate.
Answer only the number of points the question asks for, in the order given.

Due Diligence and Valuation of Infrastructure in other exams

The same ground in other exams, if you are preparing for more than one or want another angle on it.

Due Diligence and Valuation of Infrastructure: frequently asked questions

How do you value an infrastructure investment using DCF?

Forecast the free cash flows over the asset's life, deduct needed capex, and discount them at a rate that reflects their risk. Add a terminal value only if the asset continues beyond the forecast. Then test sensitivities.

What discount rate should you use for infrastructure assets?

Use a rate that matches the cash flow risk. Contracted or regulated operating cash flows with strong counterparties justify a lower rate. Construction, merchant and country risks justify a higher one.

What is in an infrastructure due diligence checklist?

Key areas are legal and contracts, regulation, technical condition and construction, demand and counterparties, financing and covenants, ESG and tax. Focus on the ones that drive the asset's cash flows.

Why is terminal value treated differently for infrastructure?

Many assets are held under concessions that end on a fixed date, sometimes with the asset returning to the grantor. In that case terminal value is zero or a stated residual. Indefinite-life assets such as some utilities can use a growth-based terminal value.