A Sustainable Aviation Fuel Plant Financial Model helps investors, project developers and industrial companies understand whether a proposed SAF manufacturing project can generate commercially viable returns before major capital is committed. SAF is being considered globally as an important route for reducing lifecycle emissions from aviation, but the economics are very different from a conventional fuel project because feedstock cost, conversion technology, hydrogen requirement, plant scale and long-term offtake have a major impact on profitability.

For investors in India, a SAF project should not begin only with technology selection. The financial model should first connect feedstock availability, conversion yield, product output, selling price, CAPEX, OPEX, financing structure and airline or refinery offtake.

Green Permits Consulting supports developers with SAF feasibility studies, DPR preparation, feedstock assessment, technology evaluation, CAPEX and OPEX modelling, financial analysis and project implementation planning.

Understanding the SAF Business Model

Sustainable Aviation Fuel can be produced through different approved technology pathways depending on the available feedstock and project configuration. Potential feedstocks may include used cooking oil, certain waste oils and fats, agricultural or biomass-based materials, municipal or industrial waste-derived streams and other eligible feedstocks depending on the selected pathway and applicable sustainability requirements.

The basic commercial model can be represented as:

Feedstock → Pre-Treatment → Conversion → Upgrading → SAF + Co-products → Customer

A SAF facility may also produce co-products such as renewable diesel, naphtha or other hydrocarbon fractions depending on the process route.

The financial model should therefore calculate revenue from the complete product slate instead of assuming that every tonne of feedstock becomes aviation fuel.

Feedstock Cost is One of the Biggest Financial Drivers

Feedstock is often one of the largest operating costs in a SAF project. The actual economics depend on what material the plant uses, how much is available and how far it must be transported.

A project using waste oils may face competition from biodiesel, renewable diesel and other users. A biomass-based project may need a much larger collection network because the raw material can have low bulk density and seasonal availability.

The financial model should therefore calculate the delivered feedstock cost, not only the purchase price.

This includes procurement, aggregation, storage, transportation, pre-treatment and losses before the material reaches the main conversion process.

A useful calculation is:

Feedstock Purchase + Collection + Transport + Storage + Pre-Treatment = Delivered Feedstock Cost

If the plant depends on material collected over a very wide radius, logistics can materially reduce project margins.

Technology Determines CAPEX and Yield

SAF plants can use different conversion technologies, and each route has a different capital and operating structure.

A waste-oil-based hydroprocessing project may require feedstock pre-treatment, hydrogen, reactors, separation and product-upgrading systems. Other pathways can involve gasification, Fischer-Tropsch synthesis, alcohol conversion or other specialised processing depending on the feedstock.

Technology selection directly affects SAF yield.

A project processing 1 tonne of feedstock does not necessarily produce 1 tonne of SAF. There may be co-products, process losses, water, gases and other fractions.

The financial model should therefore establish a detailed material balance:

Feedstock Input → SAF Output + Co-products + Process Losses

Small changes in product yield can have a major effect on revenue in a large plant.

CAPEX for a Sustainable Aviation Fuel Plant

There is no standard investment applicable to every SAF project. CAPEX depends on plant capacity, feedstock, process route, hydrogen source, degree of integration and existing infrastructure.

A greenfield SAF plant can require investment in feedstock receiving, pre-treatment, conversion units, reactors, distillation, storage tanks, utilities, hydrogen systems, laboratories, wastewater treatment, fire protection and product storage.

The total project investment should therefore be calculated as:

Land + Civil Works + Process Plant + Utilities + Storage + Hydrogen Infrastructure + Environmental Systems + Engineering + Contingency + Working Capital

A project developed within an existing refinery or industrial complex can have a different cost structure because some utilities, storage or logistics infrastructure may already be available.

This is why CAPEX should be developed from the actual project configuration rather than using only a generic cost per tonne.

OPEX and Production Cost

Operating cost should be calculated per litre or per tonne of SAF produced.

Major OPEX items can include feedstock, hydrogen, electricity, steam, water, catalysts, chemicals, manpower, maintenance, laboratory testing, waste treatment and logistics.

For some pathways, hydrogen can become an important cost because it is required for upgrading and removing oxygen from feedstock.

The financial model should calculate:

Feedstock + Hydrogen + Energy + Chemicals + Labour + Maintenance + Other OPEX = Total Production Cost

This production cost can then be compared with the expected SAF selling price.

The project should also distinguish between variable costs, which increase with production, and fixed costs, which continue even when plant utilisation falls.

Plant Capacity and Utilisation

Large plants can benefit from economies of scale, but only if enough feedstock can be secured.

A SAF project should therefore not select a very large capacity simply because the technology supplier can provide it.

If a 500,000-tonne project can secure only a fraction of the required feedstock, fixed costs are spread across lower production and the financial model can deteriorate quickly.

The correct sequence should be:

Feedstock Availability → Technology Yield → Product Demand → Plant Capacity

The financial model should also use gradual capacity utilisation during the initial operating years. Commissioning, technical stabilisation and customer qualification can take time, so assuming full capacity from the first year can overstate returns.

Revenue from SAF and Co-Products

The main revenue comes from the sale of Sustainable Aviation Fuel, but co-products can also contribute significantly depending on the technology route.

A simplified calculation is:

SAF Production × SAF Selling Price + Co-product Revenue = Gross Revenue

However, the selling price should be based on realistic offtake discussions rather than only on international headline prices.

Airlines, fuel suppliers and refiners may use different commercial structures, including long-term supply agreements.

For project finance, a long-term offtake agreement can be particularly valuable because it gives lenders and investors greater visibility into future revenue.

Carbon and Environmental Value

SAF projects may benefit from environmental attributes or carbon-related value depending on the fuel pathway, lifecycle emissions performance, sustainability certification and applicable market mechanism.

However, this revenue should be treated carefully.

Carbon-related income should not be included as guaranteed revenue unless the project has identified the applicable methodology, verification requirements, buyer and expected price.

A safer financial model should show:

Core Fuel Economics

and separately:

Potential Environmental Attribute Revenue

This prevents the project from appearing profitable only because of uncertain carbon assumptions.

Working Capital Requirement

Working capital can become significant because the plant may need to hold feedstock inventory while also carrying finished fuel and customer receivables.

The cash cycle can look like:

Feedstock Purchase → Storage → Processing → SAF Inventory → Sale → Customer Payment

Seasonal feedstock can increase the problem because the plant may need to purchase and store large quantities during specific periods.

The DPR should therefore estimate inventory days, supplier payment terms and customer credit rather than applying a standard working-capital percentage.

Project Finance and Debt Service

A SAF project may be financed through promoter equity, term debt, strategic investors or other suitable financing structures.

Lenders typically need confidence in the feedstock supply, technology, EPC arrangement, buyer market and projected cash flow.

One of the most important indicators is whether the project generates enough operating cash to service debt.

The model should assess DSCR, break-even utilisation, payback period, IRR and project cash flow under realistic assumptions.

The project should remain financially understandable even if the selling price falls or feedstock cost increases.

Sensitivity Analysis is Essential

SAF economics can change significantly because of feedstock prices, technology performance and fuel selling prices.

A good financial model should therefore test multiple scenarios rather than relying on one base case.

Important sensitivities include higher feedstock cost, lower SAF yield, lower plant utilisation, higher hydrogen cost, higher CAPEX and lower SAF selling price.

For example:

Base Case → Feedstock +10% → SAF Price -10% → Utilisation -15% → Project Returns

This tells investors which variables create the greatest financial risk and where long-term contracts may be necessary.

DPR for Sustainable Aviation Fuel Plant

A professional SAF Plant DPR and Financial Model should connect feedstock, technology and market demand with project finance.

The DPR should cover feedstock availability, selected pathway, material balance, plant capacity, machinery, utilities, site, CAPEX, OPEX, working capital, revenue and financing.

A practical development sequence is:

Feedstock Study → Technology Assessment → Offtake Study → Capacity Planning → DPR → Financial Model → Finance → EPC → Commissioning

This reduces the risk of investing in a technically advanced project that lacks sufficient feedstock or a commercially viable buyer.

How Green Permits Helps

Green Permits Consulting supports investors and project developers with Sustainable Aviation Fuel Plant feasibility studies, DPR preparation, feedstock mapping, technology assessment, CAPEX and OPEX modelling, financial analysis and project implementation planning.

The objective is to determine whether the proposed SAF project has the right feedstock, technology, plant scale and offtake structure before major capital is committed.

Learn More About Sustainable Aviation Fuel Plant Financial Modelling

If you are planning a SAF manufacturing project, the first stage should evaluate feedstock security, technology yield, hydrogen requirement, plant capacity, product offtake and financial viability before machinery is finalised.

Read more about plant feasibility and DPR consulting services here:

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If you are planning a Sustainable Aviation Fuel Plant in India, Green Permits Consulting can assist with feasibility studies, DPR preparation, feedstock analysis, financial modelling and project implementation.

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