This winter I was walking the dog across the fields near home when something caught my eye.
The Crown had commissioned contractors to clear large numbers of trees from the flood relief channels that run across the farmland.
I expected a few piles of logs.
Instead, it looked like an American lumber yard.
Hundreds upon hundreds of tonnes of timber stacked in enormous rows.
I’d genuinely never seen anything like it.
Curiosity got the better of me, so I stopped to speak to one of the farmers.
He told me the timber wasn’t destined for furniture or construction.
It was being sold into the biomass industry.
He’d even driven out to one of the processing facilities.
His description was simple.
“It’s absolutely massive.”
That conversation sent me down a rabbit hole.
Because biomass power isn’t simply “burning wood.”
It’s an industrial supply chain stretching from forests and farms all the way to the National Grid.
The misconception
When people hear biomass, they often picture someone throwing logs into a stove.
That certainly exists.
Oddly, my first mental image has always been something straight out of science fiction.
You know the scene.
Some futuristic civilisation where, after you die, your body is quietly recycled into the city’s energy supply.
Thankfully… biomass power isn’t that.
At least, not in the UK.
Commercial biomass is far less dramatic, but, in many ways, far more interesting.
It’s an industrial supply chain built around recovering energy from biological material that would otherwise have little economic value.
Trees cleared from flood channels.
Forestry thinnings.
Sawmill offcuts.
Storm-damaged timber.
Agricultural residues.
Energy crops grown specifically for fuel.
Even before a single watt of electricity is generated, there’s an entire industry dedicated to sourcing, processing, transporting and insuring the fuel that keeps these power stations running.
Where does the fuel actually come from?
Unlike coal, oil or natural gas, biomass isn’t extracted from one place.
It is collected.
Every lorry arriving at a biomass processing facility may have originated from a completely different source.
Commercial biomass fuel commonly comes from:
- Forestry thinning operations
- Tree surgery contractors
- Crown Estate woodland management
- Sawmill offcuts
- Storm-damaged woodland
- Agricultural residues
- Low-grade timber unsuitable for construction
- Waste wood from manufacturing
- Purpose-grown energy crops such as miscanthus and short rotation willow coppice
None of these materials are particularly valuable on their own.
The industry exists because, collectively, they represent a huge untapped energy resource.
Turning trees into fuel
Standing beside those enormous stacks of timber, I assumed they would simply be loaded onto lorries and burned.
The reality is considerably more complicated.
Freshly felled timber often contains over 50% moisture.
Burning it immediately is incredibly inefficient because so much of the available energy is lost evaporating water.
Instead, commercial biomass normally follows a process similar to this:
- Harvesting
- Transport to a processing facility
- Removal of metal and stone contaminants
- Chipping or shredding
- Drying
- Screening into uniform sizes
- Pelletising or storage as wood chip
- Delivery to biomass power stations by road, rail or ship
Every stage costs money.
Every stage introduces risk.
Power stations require fuel that burns consistently.
Variations in moisture content, particle size or contamination directly affect combustion efficiency and electricity output.
Scale changes everything
The farmer wasn’t exaggerating.
Some UK biomass processing sites can process up to 80 tonnes of waste wood every hour, producing a consistent fuel for the energy sector.
Further down the supply chain sits one of Britain’s largest biomass power stations.
Drax, near Selby in North Yorkshire, generates enough electricity to power millions of homes and stores vast quantities of compressed wood pellets in storage domes that each hold around 80,000 tonnes of fuel.
It puts those piles of timber sitting beside a Nottinghamshire field into perspective.
What looked enormous to me is simply another delivery somewhere further down a very long supply chain.
The logistics nobody sees
One thing that surprised me most is that biomass is really a logistics business disguised as an energy business.
Before fuel reaches a power station it may already have passed through:
- Forestry contractors
- Farmers
- Woodland managers
- Tree surgeons
- Waste wood recyclers
- Biomass processors
- Haulage companies
- Rail freight operators
- Port operators
- Fuel quality laboratories
Unlike natural gas flowing through a pipeline, biomass is constantly moving.
Every transfer increases cost.
Every mile increases transport emissions.
Every delay reduces profitability.
Electricity generation begins long before the turbine starts turning.
Insurance and operational risk
Once I started looking at biomass from an insurance perspective, the industry became even more interesting.
Fire
Wood has one obvious characteristic.
It burns.
Large stockpiles of wood chip can begin to self-heat through microbial activity.
Dust created during chipping and processing can become explosive under the right conditions.
Conveyor systems run continuously around combustible material.
Many facilities therefore invest heavily in:
- Thermal imaging cameras
- Automatic fire suppression
- Spark detection systems
- Dust extraction
- Fire compartmentalisation
Fire remains one of the largest insured risks across the biomass industry.
Machinery breakdown
Turning thousands of tonnes of timber into a consistent fuel is mechanically brutal.
Hidden contaminants are everywhere.
Wire.
Fence posts.
Metal.
Concrete.
Stones.
Even after screening, they accelerate wear on:
- Chippers
- Hammer mills
- Conveyors
- Dryers
- Pellet presses
- Boilers
A major equipment failure can halt production for weeks while specialist replacement parts are sourced.
Business interruption insurance often becomes as valuable as the machinery insurance itself.
Weather
Ironically, rain becomes an operational problem.
Wet timber contains less usable energy.
Storage yards require careful management to prevent excessive moisture absorption.
Harvesting operations can also be delayed by flooding or poor ground conditions.
Unlike coal, biomass changes with the weather.
Fuel supply
Biomass also carries a very different supply risk to fossil fuels.
Future fuel availability depends on:
- Forestry policy
- Woodland management
- Storm damage
- Tree disease
- Agricultural land use
- Government subsidies
- Environmental regulation
A poor harvesting season today may affect electricity generation months or even years later.
Energy security begins in the woodland.
Not at the power station.
The sustainability debate
Biomass is often described as renewable.
That is true—but only if the fuel is sourced responsibly.
Supporters argue that managed forests can be continually replanted, allowing new trees to absorb carbon as they grow.
Critics point out that transporting biomass over long distances and harvesting mature forests can significantly reduce those environmental benefits.
The carbon footprint of biomass therefore depends on questions such as:
- Where did the timber come from?
- Was the forest replanted?
- How far did the fuel travel?
- Was waste wood used instead of healthy timber?
- What fossil fuel is being replaced?
The answers matter far more than the label “renewable.”
The strategic lesson
Standing beside those enormous stacks of timber this winter, I thought I was looking at piles of logs waiting to be cleared.
I wasn’t.
I was looking at the beginning of a national energy supply chain.
Electricity doesn’t simply begin at the power station.
For biomass, it begins in forests, flood channels, farms, sawmills, haulage depots and processing plants.
Long before the first turbine starts turning, thousands of people have already harvested, sorted, processed, transported, tested, insured and financed the fuel that keeps those generators running.
Like so much of modern infrastructure, the interesting part isn’t the power station.
It’s everything that has to happen before the fuel even arrives.
Gareth Winterman