Biomass Fuel Supply for Industrial Boilers: Sourcing, Storage and Delivery

Last updated: 1 November 2026 · By KSR Green Bharat Team

Key takeaways

• Match fuel form and size to your boiler’s feeding and firing system.
• Specify GCV, moisture, ash, fines and size in the contract.
• Buy on heat value, not on weight.
• Covered storage and pre-monsoon buffers prevent most supply disruptions.

Why are industries switching to biomass fuel?

Industrial users are adopting biomass to reduce exposure to coal and fuel-oil price swings, meet sustainability commitments and use locally available agro-residue. At the same time, India’s co-firing policy is pulling large volumes of pellets into thermal power plants, which means industrial buyers compete for good-quality supply. A structured supply plan is now as important as the boiler itself.

Step 1: Choose the right fuel form

Always confirm with the boiler manufacturer or a qualified engineer. Switching fully from coal may need changes to feeding, air distribution and ash handling. See also our pellets vs briquettes guide.

Step 2: Write a clear fuel specification

A specification protects both buyer and supplier. Include:

• Fuel form, size and permitted feedstocks
• Minimum gross calorific value (kcal/kg, as received)
• Maximum moisture, ash and fines
• Sampling method and testing standard
• Price adjustment for GCV variation and quantity adjustment for excess moisture
• Rejection criteria for visibly wet or contaminated lots

Government pellet specifications for power plants, such as the SAMARTH recommendation of moisture not above 14% and fines below 5%, are a useful reference even for industrial buyers. Details are in our co-firing pellet specifications article.

Step 3: Compare offers on delivered heat

Two fuels at the same price per tonne can deliver very different amounts of heat. Use this simple formula:

Cost per 1,000 kcal = Landed price per kg ÷ (GCV in kcal/kg ÷ 1,000)

Example: Fuel A costs ₹7.50/kg landed at 3,600 kcal/kg = ₹2.08 per 1,000 kcal. Fuel B costs ₹7.00/kg at 3,000 kcal/kg = ₹2.33 per 1,000 kcal. Fuel A is cheaper on heat even though it costs more per kg. Then factor in ash disposal and boiler efficiency.

Step 4: Plan sourcing around the seasons

• Know your feedstock calendar: rabi residues such as mustard arrive in spring; kharif residues such as paddy and soybean arrive after the monsoon.
• Use more than one supplier and, where possible, more than one feedstock base.
• Agree volumes in advance for the peak demand months.
• Visit supplier plants to see their storage and testing practices.

Step 5: Size covered storage properly

Biomass loses value when it gets wet: calorific value falls, pellets break into fines and briquettes swell or crack. Storage should be:

• Covered, on a raised or paved floor with drainage
• Ventilated, with stock rotated on a first-in, first-out basis
• Large enough for several days to a few weeks of consumption, with extra buffer before the monsoon
• Monitored for temperature in large piles to catch self-heating early
• Kept clear of ignition sources, with fire-fighting equipment in place

Step 6: Set a delivery schedule

Calculate tonnes per day from steam demand and boiler efficiency, then set delivery frequency so storage never falls below a safety stock. Smaller, more frequent deliveries reduce storage needs but increase dependence on transport. Agree how short supply will be handled in the contract.

Step 7: Test on receipt and track performance

Weigh, sample and test each delivery for moisture and GCV, at least by quick checks, with periodic lab tests. Track steam output per tonne of fuel and ash generated. Over time, this data shows which suppliers and fuels give the best real-world value.

How KSR Green Bharat supports fuel users

KSR Green Bharat’s fuel supply and management support helps industrial users plan the right biomass form, sourcing approach, covered storage and delivery frequency around plant demand. Share your boiler type, current fuel and daily consumption with our team to discuss a practical plan.

Frequently asked questions

How much biomass storage should an industrial plant keep?

It depends on daily consumption, supplier distance and season. Many plants plan several days to a few weeks of covered stock, with more buffer before the monsoon and during harvest gaps. Size storage from your actual tonnes-per-day consumption.

What should a biomass fuel supply contract specify?

Fuel form and size, minimum gross calorific value, maximum moisture, ash and fines, testing method, sampling at receipt, price adjustment for quality deviations, delivery frequency and penalties for short supply.

Why does biomass fuel quality vary so much?

Feedstock changes with season and region, and moisture picked up during transport or storage lowers usable heat. Consistent pre-dispatch testing and covered storage are the most practical controls.

Can a coal-fired boiler switch to biomass?

Many grate-fired and fluidised-bed boilers can use biomass briquettes or pellets, fully or blended, sometimes with modifications to feeding, air distribution and ash handling. Get a technical review from the boiler OEM or a qualified engineer first.

How do I compare biomass fuel offers fairly?

Compare cost per unit of delivered heat, not per tonne. Divide the landed price by the tested gross calorific value and adjust for moisture and ash.

Sources

• SAMARTH – Recommended pellet specifications (PDF)
• Lok Sabha Unstarred Question 3038 – Benchmark pricing per 1,000 kcal (PDF)