PPP versus Off-take, Which Fits Your Project

The design of a large infrastructure transaction is a set of choices about who bears which risk. Two structural archetypes dominate the choices in African markets: the public-private partnership (PPP) and the straight off-take arrangement. Each has its own risk-transfer logic, its own contract architecture, and its own footprint on the host government's balance sheet. Sponsors and government departments that treat the two as interchangeable produce transactions that leave value on the table or transfer risk to parties who cannot bear it.

This piece sits under the m1 pillar on what makes a large infrastructure project fundable. It sets out the risk-transfer logic behind each archetype, when to choose which, and where the choice is constrained by the specific facts of the project.

The PPP archetype

A public-private partnership transfers substantial project risk from the public sector to a private consortium. Design, construction, financing, and often operations for a defined concession period are the private consortium's responsibility. The public sector pays through availability payments (where the government pays a scheduled fee for the availability of the infrastructure), user charges (where the users pay directly), or a hybrid.

The World Bank's Public-Private Partnerships Reference Guide (World Bank, 2017) sets out the international framework for PPP structures and identifies the standard risk allocations. Yescombe and Farquharson (2018) provide the practitioner-level treatment of PPP contract architecture and financing.

The attraction of the PPP structure is that it aligns incentives across the design, construction, and operating phases. The private consortium is responsible for the whole life of the asset and is paid on availability or performance, so poor design produces expensive operations that the consortium bears. Where the alignment holds, PPPs deliver assets more efficiently over the full life than traditional public procurement.

The complication is that the alignment requires a specific contract architecture, a specific risk-transfer discipline, and a specific dispute-resolution mechanism. Where any of these is not in place, the PPP structure can leave the public sector with residual risks that were supposed to have been transferred, and with contract-management obligations that are onerous to sustain across the concession life.

The off-take archetype

An off-take arrangement is simpler in concept. The private developer builds and operates the infrastructure and sells its output to a defined off-taker under a long-term contract. The government's role is typically as regulator (setting the tariff formula), sometimes as guarantor (if the off-taker is a state entity of uncertain credit), and sometimes as one contracting party in a multi-party arrangement.

The off-take structure is common in power (a power purchase agreement with a state utility), water (a bulk water supply agreement with a municipal or regional water services authority), and certain industrial infrastructure. Its attraction is simplicity: the risk allocation is clear, the contract architecture is contained, and the government's ongoing role is limited.

The complication is that the off-take structure depends critically on the off-taker's credit. Where the off-taker is a state utility whose financial position may deteriorate over the concession life, the off-take arrangement's viability depends on ongoing government support that may or may not be forthcoming. Sponsors of off-take arrangements in emerging markets have learned this lesson repeatedly: the contractual position is legally defensible; the collection position is not.

When PPP fits

The PPP structure typically fits where five conditions hold:

The output is bundled with services. A hospital PPP is not just about the building; it is about the range of clinical and non-clinical services delivered through the building over the concession life. PPPs work well where the risk of the whole bundle can be transferred to a single consortium that has the capacity to deliver across the whole scope.

The government can define availability or performance standards. PPP payments are typically tied to availability or performance. The government's ability to define these standards clearly, to measure them objectively, and to enforce them consistently determines whether the risk transfer holds.

The private sector has the capacity to bear the construction risk. PPPs put construction risk on the private consortium. Where construction risk exceeds what the local private sector can bear (either because of scale or because of complexity), the risk transfer may not hold and the consortium may seek to renegotiate mid-construction.

The concession life is long enough to justify the transaction costs. PPPs are expensive to structure. Concession lives of 20 years or longer are typical; shorter concessions rarely justify the transaction cost.

The government has the institutional capacity to manage the contract. PPP contracts require active management across the concession life: performance monitoring, dispute resolution, refinancing consents, and so on. Governments without the institutional capacity to sustain this management often find their PPP contracts deteriorating over time.

When off-take fits

The off-take structure typically fits where five different conditions hold:

The output is a defined, measurable commodity. Power in megawatts, water in cubic metres, gas in gigajoules. Off-take structures work where the deliverable is standardised and quantifiable, so the pricing formula can be applied objectively.

The off-taker has adequate credit. The off-taker's ability to pay over the concession life is the single most important structural condition. Where the off-taker is a well-rated state utility, an industrial user with an investment-grade parent, or a diversified retail base with regulator-approved tariffs, off-take works. Where the off-taker is a stressed municipality or a merchant market with no floor, off-take does not work at any reasonable equity return.

The private developer wants operational control. Off-take arrangements leave the private developer in operational control of the infrastructure. Where the developer has strong operational capabilities and wants to retain them, off-take is a natural fit. Where the developer would prefer to sell operations to a third party, other structures may fit better.

The concession life aligns with the debt tenor. Off-take contracts are typically dimensioned to match the debt tenor of the financing. Where the two align (15 to 25 years is common), the structure works. Where they do not (an offtake of 10 years with debt tenor of 20 years), the residual risk of finding a new off-taker at year 10 falls to the developer, which is often not sustainable.

Regulatory certainty is adequate. Off-take structures depend on the tariff formula being applied as agreed. Where regulatory bodies have a history of intervening in tariff reviews in ways that depart from the contractual formula, the off-take arrangement's viability is diminished regardless of the underlying contractual position.

When the choice is not a choice

Sometimes the structure is dictated by the project rather than chosen by the sponsor.

Government-mandated PPP. Some countries and some sectors have policy frameworks that require PPP structures for public infrastructure above certain sizes. Where the framework applies, the choice is between a PPP or no project.

Sector-specific off-take structures. Independent power producers in most countries are structured as off-takes because the electricity market is not organised to support alternatives. Renewable energy IPPs in the South African REIPPP programme are the canonical example: the structure is defined by the programme, and sponsors participate on programme terms.

Cross-border projects. Cross-border infrastructure typically uses hybrid structures because no single government can play the counterparty role. Multilateral participation and coordinated intergovernmental agreements substitute for either archetype pure.

The strategic futures dimension

Both structures make long-horizon commitments about the environment in which the project will operate. A 25-year PPP concession is a bet on the government's institutional capacity, fiscal position, and policy stability across a generation. A 20-year off-take is a bet on the off-taker's credit and the regulatory framework's stability across the same period.

Strategic futures work (the subject of category m5) provides tools for testing these commitments against plausible alternative future scenarios. The Western Cape Strategic Infrastructure Intent (2026 to 2050) uses scenario-based planning to test infrastructure decisions against multiple futures rather than a single central forecast. Where the structural choice survives all plausible futures, the commitment is robust. Where it survives only one scenario, the commitment is fragile and the alternative structure may need to be reconsidered (Adendorff, 2019).

Cross-border considerations

Cross-border infrastructure typically uses hybrid structures that combine elements of PPP and off-take. A cross-border transmission line may be structured as a PPP for the construction and initial operating phase, with an off-take arrangement for the electricity flow across the border. A cross-border water pipeline may combine construction PPP with a shared-services agreement for the ongoing off-take.

Multilateral participation strengthens both structural archetypes by providing an anchor for the counterparty position (Yescombe and Farquharson, 2018). Sponsors of cross-border infrastructure should consider multilateral participation early in the structuring process rather than treating it as a late-stage addition.

What good looks like

A well-designed transaction structure fits the project's specific facts: the nature of the output, the credit of the counterparties, the institutional capacity of the government, the sector's policy framework, and the plausible future environment across the concession life. Where the fit is good, the structure delivers value across its life. Where the fit is poor, the structure produces friction, renegotiation, and sometimes failure.

The CentraSolve Large Infrastructure module supports the structural design workflow: the counterparty analysis, the risk allocation matrix, the availability-versus-performance-payment modelling, and the interaction with the m2 bankability discipline. Together, the workflow allows sponsors and government departments to make the structural choice deliberately rather than by default.

References

International framework sources

World Bank Group. (2017). Public-private partnerships reference guide (Version 3.0). Washington, DC: World Bank.

Yescombe, E. R., and Farquharson, E. (2018). Public-private partnerships for infrastructure: principles of policy and finance (2nd ed.). Oxford: Butterworth-Heinemann.

South African framework sources

National Treasury, Republic of South Africa. (2019). Budget Facility for Infrastructure: guidelines and templates. Pretoria: National Treasury.

Strategic futures sources

Adendorff, C. M. (2019). Infrastructure development scenarios for South Africa towards 2050. Prepared for the Presidential Infrastructure Coordinating Commission, Republic of South Africa.