The three phase journey

Once the foundations are in place, nuclear can progress from strategic capital through catalytic capital to mainstream finance. The roadmap describes how.

Phase 1 - Strategic Capital

Phase 2 - Catalytic Capital

Phase 3 - Mainstream Finance

Three phases to mainstream finance

This Roadmap to Mainstream Finance maps the phased transition from today's strategic capital-dependent model to a liquid, competitively priced global nuclear asset class.

The Roadmap helps stakeholder groups identify opportunities, and identifies milestones that will allow faster, more predictable financing decisions across the nuclear project lifecycle.

Experience from capital-intensive industries such as offshore wind,[20] telecommunications, and toll roads, suggests a common pattern of financial maturation. As technologies mature and delivery risks become better understood, financing evolves from government support and highly bespoke structures towards standardized instruments, institutional capital, and eventually liquid secondary markets.

Nuclear has operated commercially for more than six decades, but its financing has been shaped by unique regulatory requirements and public policies largely in isolation of market signals. In most markets outside China and a handful of established nuclear programmes, financing has only just begun to evolve. The three phases of the roadmap describe how nuclear financing can be expected to grow and evolve as the industry matures and scales its offering.

Roadmap scope and applicability

This Roadmap primarily addresses the financing pathway for new reactor build, long-term operation (LTO), and major uprate transactions. These segments, in particular new reactor build, represent the largest capital requirement and the greatest need for external finance. The nuclear value chain offers multiple additional transaction opportunities (in uranium mining, conversion, enrichment, fuel fabrication, waste management, decommissioning) each with distinct risk and reward profiles, investor entry points, and financing instruments.

This Roadmap is not addressed to a single type of market. It is intended to be relevant to the full spectrum of countries engaged in nuclear deployment, from those operating large established fleets to those expanding existing programmes or planning to introduce capacity for the first time.

The Roadmap does not prescribe how a country should finance its nuclear programme, nor does it assume that private or external capital is the appropriate or desired instrument in every context. Many countries will finance their first reactor projects through sovereign lending or intergovernmental agreements. The Roadmap neither endorses nor discourages any particular financing model.

What the Roadmap describes is the broader financial ecosystem that becomes available as the nuclear sector matures its offering, and the conditions under which external or private capital can participate and when a country, developer, or programme chooses to access it. The three-phase framework is a direction of travel towards global scaling, not a requirement for any individual country or project. For newcomer countries, the Roadmap's value is primarily prospective. Locating the relevant part of the financial ecosystem, and the instruments, structures, and conditions associated with each phase, allows governments and sponsors to design legal, regulatory, and commercial frameworks now that do not foreclose access to private capital later. Decisions made during programme design, including liability convention adherence, revenue support architecture, and project SPV structuring, have long-term consequences for financing options. Building with mainstream finance as a reference point is good programme design, even where that capital is not the immediate objective.

For countries whose nuclear financing models rely primarily on public funding, this Roadmap shows the pathway towards a mature market where risk and reward are clearly understood and accurately priced. In this mature stage, government entities can participate on commercial terms, rather than solely in a sovereign capacity to provide de-risking mechanisms or other government-only functions.

Phase 1

Strategic Capital

Government closes the financing gap; bespoke structures, no secondary market, long lead times to final investment decisions.

In many parts of the world, nuclear financing is characterized by first-of-a-kind or first-in-a-while projects and untested transaction models. This situation drives up market risk premiums and creates structural reliance on government support to underwrite costs and close funding gaps. The result is a financing environment characterized by elevated risk premiums, limited transaction replicability and dependence on public support.[21]

Category
Deployment considerations
Financing dynamics
Enabling functions
Technology & Programme Maturity
Programmes and projects are first-of-a-kind (FOAK).
Limited market liquidity and pricing benchmarks: high variance in programme/project economic outturns is dissuasive for low-cost capital providers resulting in an absence of standardized financial products and templates.
Uneven efforts across markets to minimize design adaptation can lead to higher investment needs during development phase with overall lower returns in competitive markets.
Governments define the role of nuclear energy in the national economy to give market actors clarity on the opportunities and specific frameworks governing nuclear benefits, costs and risks allocation.
Governments enable the removal of ‘binary’ risks for strategic investors and strengthen the investment case by closing gaps across project-level equity, debt, risk, revenue, and low probability-high risk events.
During this discovery phase, governments are able to define clear, pre-agreed terms for public financing, ensuring alignment with market requirements.
Delivery & Supply Chain Capability
Unknown or high completion contingencies, costs and schedule risk.
Organizational and functional maturity of supply chain partners is limited.
Supply chains not fully established; uncertainty around the supply chain’s ability to sustain continuous investment in manufacturing tools, recruitment and best practices.
Strategic investors, project developers and owners face material risks across the development, delivery and operating phases.
Low quality project data and transaction benchmarks lower non-strategic market support.

Long lead time to FID: each deal treated as unique.

Long lead times to first revenue.

Reliance on government funding (including back-stop), guarantees and other risk-sharing mechanisms. Clarity from developer/owner on deployment enablers, value estimates, funding/risk gaps.
Clarity and plan from vendor and supply chain partners to identify and close information asymmetries and unknowns with the developer/owner and future operator.
Track Record & Data Reliability

Limited operating track record.

Unknown reliability of data and reporting for third party purposes.

Liquidity and pricing reflect limited opportunities for early-stage financiers to refinance, exit and/or sell-down with confidence.
Limited transaction track record and financial replicability.
Government and/or owners with strong balance sheets can consider buy-out mechanisms for commercial financiers.
Capital Structure & Revenue Mechanisms
Secular investment case largely absent in most markets.
Reliance on government funding and de-risking.
Financing gaps; TopCo-led capital raising; limited ProjectCo/HoldCo finance.
Significant underwriting requirement from anchor investors.
Fragmented rating agency methodologies.
Reliance on government revenue support mechanisms and other risk sharing.
Risk Allocation & Pricing
Transactions are first-of-a-kind without significant replicability.

Absence of benchmarked risk premiums; risk cannot be consistently priced.

Financiers face bespoke, deal-by-deal risk assessment with limited comparable transaction data to anchor pricing decisions.

Industry improvement of value proposition.

Government-backed risk mitigation mechanisms.

Stronger engagement from financial industry, including MDBs, to address gaps.

Legal & Regulatory Framework
Legal framework can be incomplete or untested.
Project finance context is jurisdiction-specific, incomplete or untested. Investors rely on government indemnities and bilateral agreements rather than mature domestic legal precedent.
Participation in international liability conventions may be limited in newcomer markets.
SPV structures exist but decommissioning and waste management liability treatment is sometimes unresolved.
Ratification of, or legislative alignment with, international conventions to give investors an internationally recognized reference point for a newcomer's liability regime, even before domestic case law exists.

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Phase one summary: financing gap

A defining characteristic of Phase 1 is that each project is treated as a unique transaction. Differences in regulatory frameworks, development approaches, financing structures, liability regimes, and the treatment of decommissioning and waste management obligations limit transaction replicability, even when the underlying reactor technology remains unchanged. The absence of standardized financial products, independent benchmarks, secondary markets, and established credit assessment methodologies increases transaction costs and slows capital deployment. As a result, governments remain the primary providers of risk absorption and financing support.

The lack of standardized approaches to decommissioning liability allocation and limited-recourse confirmation, for example, adds to the uniqueness of each transaction. The challenge extends beyond financial structuring to legal drafting, with bespoke contractual arrangements adding time, complexity and cost to every deal.

Phase 2

Catalytic Capital

Standardization emerges; private capital begins to crowd in

Phase 2 is characterized by the shift from FOAK to early NOAK economics, the emergence of standardized risk-sharing frameworks, and the beginning of private capital entry alongside government support. Government participation remains, but its role transitions from gap-filler to catalyst, with support packages more tightly calibrated and increasingly competed. Multilateral development banks, development financial institutions, export credit agencies and other public financial institutions play an increasingly catalytic role, using guarantees, concessional resources, risk sharing mechanisms and other instruments to help drive down costs and mobilize private capital alongside public investment.

Category
Deployment considerations
Financing dynamics
Enabling functions
Technology & Programme Maturity
FOAK → NOAK pathway credibly defined with external partners and relevant milestones agreed.

Structured shift in risk allocation towards private sector as cost and performance certainty improve.

Debt and equity are both committed at FID as equity investors won’t commit before the debt is secured and vice versa.

Government support package more tightly calibrated, pre-conditions for support and removal of support are defined and agreed.

Regular, transaction-focused interfacing between government and catalytic capital providers enables finance plan iterations and increases market confidence levels.

Delivery & Supply Chain Capability

Design standardization, series production and greater modularization.

Industrial and supply chain capacity consolidates.

Private actors take business risk and financial underwriting benefiting from catalytic capital-led.

Improved pricing and risk acceptance from the delivery supply chain, leading to greater investability and bankability of the delivery arrangements.

Removal of programme/project binary risks in previous stage allows full force of MDB maturity transformation capacity to take effect.

MDBs and other development financial institutions agree on mechanisms to turn policy into market deliverables, concessionary funding to supplement national resources, catalytic capital (commercial early-stage equity, venture debt or risk guarantees) to crowd in market capital.

Track Record & Data Reliability

Experience-based track record emerging and delivery models mature.

Project information increasingly predictable.

Tested models and frameworks facilitate emergence of credible pathways to additional sources of capital.
Completed projects generate auditable cost, schedule and performance data; EPC contractors and owners accumulate replicable delivery practices that reduce per-project uncertainty and support lender underwriting.
Capital Structure & Revenue Mechanisms

Revenue mechanisms do not recognize full value.

Completion funding is uncertain.

Unclear role and value-add for commercial finance.

Multi-sourcing and blended finance only beginning to emerge.

Greater standardization of investment frameworks.

Lower barriers to private sector participation by removing bans, including nuclear in green taxonomies, and standardizing financial risk-weighted pricing and market distribution channels.

Risk Allocation & Pricing

Risk allocation shifts from ad hoc towards standardized frameworks.

Structured shift in risk allocation towards greater private sector involvement.

Deep set of comparable transactions to benchmark pricing is still lacking, but reference points emerge.

Risk premiums begin to compress as completed projects demonstrate that allocated risk behaves as expected.

Industry track record matures, enabling governments and multilateral institutions to begin to shift risk and funding off balance sheets.

Legal & Regulatory Framework
National liability frameworks are convention-aligned and include adequate coverage limits.
Standard project documentation includes clear decommissioning liability clauses. Veil-piercing risk is mitigated by well-capitalized SPVs and legally tested structures.
Government legal teams and private nuclear counsel establish precedents to draw on.

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Phase 2 summary: transition signal

Phase 2 is reached when private capital begins participating alongside public financial institutions based on standardized structures, clearer risk allocation and performance benchmarks. Public support increasingly serves to mobilize commercial capital.

Catalytic capital requires institutions with a clear mandate to support qualified programmes and projects with financing tools and institutional resources that are deemed additive and credible by project owners, governments and market actors.

Phase 3

Mainstream Finance

Nuclear as a standard infrastructure asset class; standardization, deep markets, competitive cost of capital.

In the final stage, Phase 3, nuclear becomes a mature infrastructure asset class, supported by liquid secondary markets, competitive financing costs, and broad institutional investor participation across the project lifecycle.

Phase 3 does not equate ‘mainstream finance’ exclusively with Western, market-led economic models. Rather, it signals that a country's financing architecture and nuclear investment framework has matured to the point where mainstream lenders and investors can supply low-cost liquidity through well-developed financial products.

This phase does not require governments to step back as private capital steps in, although this is what may happen in many markets. Instead, it reflects a market where risk and reward are clearly understood and accurately priced. Government-led financing, whether on or off-balance sheets, remains consistent with Phase 3 when government entities participate on commercial terms, as opposed to when they act in a sovereign capacity to provide de-risking mechanisms or other government-only functions.

Category
Deployment considerations
Financing dynamics
Enabling functions
Technology & Programme Maturity
NOAK economics: high predictability and replicability.

Developer/owner competitive tenders for equity and debt.

Government competitive tenders among developers for state support.

Delivery & Supply Chain Capability

Supply chain capacity and organisational maturity are no longer differentiating constraints.

Industry performance standards demonstrate lower variance.

Underwriting no longer requires anchor-investor-led de-risking of the supply chain.

Standard commercial due diligence frameworks have emerged.

Mature, globally distributed supply chain with established manufacturing capacity and multiple qualified vendors, built up through Phases 1 and 2.

Greater competitive tension throughout the supply chain.

Track Record & Data Reliability

Deep base of completed operating projects provides auditable cost, schedule and performance data across multiple vendors and jurisdictions.

Historical performance data supports replicability of investment models, frameworks, and assessment tools; supports standard credit assessment and rating agency methodologies, comparable to other infrastructure asset classes.
Established evaluation and reporting standards and accumulated project data (built up through Phases 1&2) allow investors and lenders to underwrite nuclear risk using conventional infrastructure finance tools.
Capital Structure & Revenue Mechanisms

Nuclear is a standard infrastructure asset class.

Government support may be limited to defined public policy functions includingcatastrophic accidents.

New financing models developed, tested and widely replicable.

Finely calibrated, value-for-money government funding.

Catalytic capital providers, including multilateral banks, can offer pre-defined generic terms & conditions to market financiers on a non-discriminatory basis.

Risk Allocation & Pricing

Risks and risk-sharing mechanisms fully understood and priced.

Uncertainty premium substantially reduced.

Policy stability embedded in long-term regulatory frameworks.

Robust secondary market across all financing instruments.

Finer spreads, more competitive pricing, broad risk distribution.

International cooperation frameworks reduce cross-border risk.

Policy stability and long-term investment frameworks embedded.

Catastrophic accident indemnity as only residual government backstop.

Legal & Regulatory Framework
Nuclear legal frameworks are standardized across key markets enabling template documentation.
Legal due diligence is a known and bounded exercise and secondary market transactions are legally routine.
Legal frameworks converge across jurisdictions as more countries adopt accepted industry model provisions and align with international conventions, allowing legal due diligence and template documentation to be reused across markets rather than rebuilt for each transaction.

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Phase 3 summary: target conditions

Mainstream finance for nuclear will be achieved when three conditions have beenmet:

  • Financial products are sufficiently standardized to be widely and confidently priced.
  • Private actors (developers, financial investors, and commercial lenders) lead underwriting, with government and catalytic capital playing a limited and targeted role.
  • A liquid secondary market allows institutional investors to enter and exit positions across the project lifecycle.

The pace and timing at which the sector reaches this stage will depend on the level of industry maturity achieved, underscoring the need for the sector’s project and industrial evolution to advance in parallel with the evolution of financial mechanisms and market confidence rather than sequentially.

Different countries, technologies, and industry segments may occupy different phases simultaneously, and strategic, catalytic, and mainstream capital can all coexist within a market. What evolves over time is their importance and role in enabling deployment. Even in a mature market, mainstream capital does not necessarily finance a project from inception or through construction. In such cases, strategic or catalytic capital may continue to carry construction-phase risk. Mainstream capital would enter predominantly through secondary markets, financing operational assets once they are generating stable, de-risked cashflows.

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