If you live in a city, you probably take electricity, water, and other basic utilities for granted. They are supplied through established infrastructure and are available whenever we need them.
But a palm oil mill and plantation complex located deep in a remote area can be very different.
Far from towns and public utilities, the mill often has to generate and manage its own essential resources. Water, fuel, steam and electricity are all part of an integrated system that allows the entire plantation and mill complex to operate independently.
This is where the concept of sustainable energy begins.
Water: The First Essential Resource
The first requirement is water.
The source may be a river, a natural lake, or even a man-made reservoir. Raw water is pumped to the Water Treatment Station, where it goes through several treatment stages, including screening, coagulation, flocculation, clarification and filtration.
For boiler feedwater, additional treatment may be required, such as water softening, reverse osmosis (RO), and internal boiler-water treatment.
Chemicals such as oxygen scavengers, phosphate and alkalinity control agents are used to protect the boiler system. A deaerator may also be installed to remove dissolved gases, particularly oxygen, before the water enters the boiler.
One important tool used by water-treatment operators is the Jar Test. It provides an indication of the appropriate coagulant dosage required to achieve effective clarification.
Laboratory analysis is equally important.
Test results from raw water, treated water and boiler water must be regularly reviewed to ensure that the quality of water entering the boiler remains within the required operating parameters.
For domestic water used by employees, chlorination is normally carried out to maintain safe water quality.
Interestingly, not every palm oil mill has access to freshwater.
Some mills, particularly those located on islands, have explored the use of seawater as a raw-water source, followed by appropriate treatment to make it suitable for industrial operations.
From Biomass to Steam
After water, the next major requirement is fuel.
A typical palm oil mill may use a biomass-fired water-tube boiler with a capacity of approximately 30–45 tonnes of steam per hour, depending on the mill's processing capacity.
The remarkable part is that much of the boiler fuel is generated by the palm oil milling process itself.
The main biomass fuels include:
* Mesocarp fibre
* Palm kernel shell (PKS)
* Empty fruit bunches (EFB), particularly when processed into shredded EFB
On a dry basis, their approximate gross calorific values (GCV) can be around:
* Palm kernel shell: 20 MJ/kg
* Mesocarp fibre: 19 MJ/kg
* Shredded EFB: 18 MJ/kg
These fuels can be blended in appropriate proportions to maintain stable combustion, optimise boiler performance and ensure continuous steam production in line with mill operations.
Mesocarp fibre produced during normal milling is commonly mixed with palm kernel shell and conveyed directly to the boiler.
Any excess biomass beyond the immediate boiler requirement can be stored and used during mill start-up or periods when normal fuel production is insufficient.
Some mills have also introduced Walking Floor Biomass Fuel Feeding Systems to store and automatically feed excess mesocarp fibre.
A properly designed system can provide several hours of boiler operation without requiring continuous biomass supply directly from the milling process. This provides additional operational flexibility and improves mill reliability.
The Rising Value of Palm Kernel Shell
Palm kernel shell is another important biomass fuel.
It can be recovered through processes such as hydrocyclone or claybath separation. Traditionally, PKS was viewed mainly as a by-product of the milling process.
Today, that perception has changed dramatically.
Palm kernel shell has become a valuable commodity.
The industry has increasingly started to monitor PKS extraction in much the same way it monitors Oil Extraction Rate (OER) and Kernel Extraction Rate (KER).
Under a typical mass balance, PKS generation may be around 5–7% of FFB processed. However, the introduction of newer oil palm clones and changes in fruit characteristics have resulted in some mills experiencing lower PKS production.
This reduction has an impact beyond the mill's mass balance.
It can directly affect boiler operation because less PKS means that additional biomass fuel may be required to maintain the required steam production.
PKS: From Waste to Global Commodity
The PKS industry has become increasingly interesting.
In 2025, Indonesia and Malaysia exported several million tonnes of palm kernel shell combined, with major importing markets including Japan, Thailand and Singapore.
Much of this PKS is used as biomass fuel, particularly as an alternative or supplement to coal in energy-generation applications.
Within the palm oil industry itself, PKS remains an important fuel source.
Palm oil refineries located in urban areas can also use PKS for their daily energy requirements. Some dedicated power plants using shredded EFB as their primary biomass fuel may also require PKS to support their energy-generation systems.
Strong demand has transformed PKS from a difficult-to-store by-product into an important source of additional revenue for palm oil mills.
Years ago, PKS could have a value of only a few ringgit per tonne and was sometimes considered a storage problem.
Today, depending on market conditions, PKS prices can reach RM300–RM400 per tonne.
That is a remarkable transformation.
What was once considered a waste or low-value by-product has become a valuable biomass commodity.
The Challenge of EFB
But PKS availability is limited.
As demand continues to grow, many companies have started looking at empty fruit bunches (EFB) as an alternative biomass fuel.
EFB can be shredded and reduced in size so that it becomes more suitable for boiler combustion.
However, EFB presents another challenge: high moisture content.
Large storage areas may be required to allow the material to dry sufficiently before it can be used efficiently as boiler fuel.
There have also been efforts to convert EFB into biomass pellets, making it easier to handle, transport, store and use as a fuel.
These developments are creating another interesting transformation in the palm oil industry.
The mill is no longer simply processing FFB.
It is beginning to process its own by-products into energy resources.
More Biomass, More Steam, More Power
As more biomass resources are utilised, the energy system of the palm oil mill can also evolve.
Boiler capacity may increase, while larger steam turbines can be installed to convert excess steam energy into electricity.
In the past, a 700 kW steam turbine might have been sufficient for a particular mill's electrical requirements.
Today, depending on mill capacity and energy demand, turbines rated at 2,000 kW or even 2,500 kW can be installed.
This represents a major change in the role of the palm oil mill.
The mill is no longer merely a facility for processing fresh fruit bunches.
It can become:
A water producer.
A biomass producer.
A steam producer.
An electricity producer.
And, indirectly, an energy supplier to the wider world.
This is one of the most fascinating aspects of a sustainable palm oil mill.
What begins as a fruit-processing facility can become an integrated resource and energy centre—where water is treated, biomass is recovered, steam is generated, electricity is produced, and agricultural by-products are transformed into valuable energy resources.
The future palm oil mill is therefore not simply about extracting oil from fruit.
It is about extracting value from every resource.
And when almost nothing is wasted, the mill itself becomes part of the solution for a more sustainable energy future.
That's my story for this evening.
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