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Biomass plants succeed or fail on fuel. Equipment can be specified, financed and built to a schedule. Fuel has to arrive — at the right quality, in the right quantity, every week for fifteen years or more. That is why fuel is the first thing any serious developer, engineer or lender looks at.
Here is how to think about your own residue before you talk to anyone.
1. Volume and availability
The question is not "how much residue do we produce?" but "how much can we rely on, every month, for the life of the plant?"
- Annual tonnage sets the maximum plant size.
- Seasonality matters: a sugar mill's bagasse arrives in a crushing season; a plywood mill's offcuts arrive all year. Seasonal fuel needs storage or a supplementary supply.
- Security matters: is the residue yours, or could a competing buyer take it? Is production likely to grow or shrink?
A plant is usually sized to the fuel that is reliably available year-round, not to the peak.
2. Consistency
Plants run best on fuel that looks the same every day. Mixed residues, variable particle sizes and contamination (soil, stones, metal, plastics) all add complexity. Most residues can be prepared to a consistent specification — sizing, screening, blending — but the preparation needs to be designed in.
3. Moisture
Moisture is energy you have to pay to evaporate. Typical ranges:
| Residue | Typical moisture as produced |
|---|---|
| Rice husk | ~10% |
| Palm kernel shell | ~10–15% |
| Sawdust and dry offcuts | ~10–20% |
| Fresh wood chip | ~35–50% |
| Bagasse | ~45–50% |
| Empty fruit bunches | ~60%+ |
Wet fuels are workable — they just need drying, ideally with the plant's own recovered heat. What matters is knowing the number rather than guessing.
4. Ash and composition
Ash content and composition affect how the plant is designed and maintained. High-silica fuels such as rice husk produce a lot of ash; some agricultural residues contain alkali metals and chlorine that can cause fouling. Laboratory analysis of representative samples — proximate and ultimate analysis, ash composition and calorific value — settles these questions early.
5. Cost
The cost of fuel is not only its purchase price:
- Your own residue may be free or even negative-cost if you pay to dispose of it today.
- Purchased residue carries a price, haulage and handling costs, and contract risk.
- Preparation — drying, sizing, storage — has a cost per tonne.
The strongest projects run mostly on residue the site already produces, supplemented by a contracted local supply.
Fuel supply agreements
Where a plant needs residue beyond what the host site produces, supply is contracted. A good fuel supply agreement covers:
- Quantity — annual and monthly volumes, with tolerances;
- Specification — moisture, size, contamination limits and how they are tested;
- Price and indexation — fixed, indexed or linked to an agreed benchmark;
- Delivery and storage — who transports, where it is stored, and how much buffer stock is held;
- Term — ideally aligned with the energy agreement, or with options to extend;
- Remedies — what happens if deliveries fall short or quality is out of specification.
Lenders will review these agreements closely. A plant with most of its fuel coming from the host site's own residue, topped up by one or two contracted suppliers, is the strongest position.
Storage and buffer stock
Fuel arrives in batches; plants run continuously. Storage bridges the gap and protects against supply interruptions. How much is needed depends on how reliable deliveries are and how seasonal the residue is — from a few days of buffer for residue produced on site every day, to months for crops harvested once a year. Covered storage also protects fuel from rain, which matters for moisture-sensitive residues.
A simple self-assessment
Before talking to a developer, gather:
- Annual tonnes of each residue, by month if possible;
- What you do with each residue today, and what it costs or earns;
- Any laboratory analysis you already have (moisture, ash, calorific value);
- Other residue sources within about 50 km;
- Your electricity and heat demand profile.
How CNP assesses fuel
Fuel assessment is the first stage of every CNP project: we sample and analyse the residue, map its availability through the year and design the plant and fuel preparation around it. See how we deliver projects.
Next step
Assess your site — send us what you have, and we will tell you whether your residue can support an onsite plant.
