By Lukie Pieterse, Potato News Today

An exploration of how a warming climate, volatile energy prices and fragile grids are reshaping the potato cold chain – and why smarter, more resilient storage design is becoming just as important as what happens in the field.

For most of the modern potato era, the cold chain has been an unspoken promise: if you can get the crop out of the ground and into a store, the rest is largely a matter of routine. Fans would run, compressors would hum, trucks would turn up, and the potatoes would move quietly from farm to packhouse to processor to plate.

That promise is now under strain.

Energy costs spike and dip unpredictably. Grids sag under heatwaves, storms and aging infrastructure. Winters are milder, harvests hotter, and the gap between outside weather and desired storage conditions narrows. At the same time, buyers and regulators are asking hard questions about emissions, efficiency and resilience.

This article looks at what happens when the cold part of the potato chain can no longer be taken for granted – and how storage design and control are being forced to evolve.

Why the cold chain suddenly feels fragile

For decades the cold chain around potatoes was a background assumption. If the crop made it into a reasonable store, things would probably be fine: nights were cool, electricity was relatively cheap, and the grid was boring in the best possible way.

That background assumption is now cracking. The cold chain feels fragile because three big forces are pushing on it at the same time – climate volatility, energy disruption and infrastructure strain – and they all hit storage at its most sensitive points.

Climate volatility – when “normal” weather disappears

Most existing potato stores were designed around an unspoken climate model:

• harvests would usually come in cool enough that you were pulling down from, say, 10–15 °C, not 18–22 °C,
• autumn and winter would provide a steady supply of cold, relatively dry air,
• extreme heat or unseasonal warmth would happen, but not often enough to drive design decisions.

That picture is fading.

In many regions, growers and storage managers are now dealing with:

• hotter harvests – pulling trucks in with tubers at 18–25 °C after late heatwaves or compressed harvest windows ahead of storms,
• warmer, wetter winters – ambient air that is too warm, too humid, or both, limiting the usefulness of natural cooling,
• unpredictable extremes – short, sharp heat spikes in autumn, prolonged thaws in mid-winter, sudden cold snaps that can form ice on intake louvres.

For storage, that means:

• more energy is needed just to get the crop from field temperature down to safe holding temperature,
• ventilation strategies based on “cool night air” simply do not work as often,
• and control systems face a much more erratic outside input – sharp swings instead of the gentle seasonal curve they were designed around.

The result is a feeling of constant improvisation: fewer seasons where the climate quietly works with you, more seasons where it feels like you are fighting the weather from the day the first load arrives until the last box leaves.

Energy disruption – from predictable cost to moving target

The second pressure point is energy. The cold chain runs on electricity, diesel and, in some systems, gas or other fuels. For a long time, those inputs had three characteristics that made planning easy:

• prices trended gently,
• supply was generally reliable,
• and tariff structures were simple enough that most people never thought deeply about them.

That has changed.

Storage operators are now facing:

• price volatility – electricity tariffs and fuel costs that can swing dramatically within a single storage season,
• complex tariffs – time-of-use rates, demand charges and penalties that make the timing of energy use almost as important as the amount,
• policy noise – shifts in carbon pricing, taxes, and incentives that can make investments look wise one year and marginal the next.

On the ground, this translates into uncomfortable questions every time a fan or compressor runs:

• Are we cooling because the crop really needs it, or out of habit?
• What will this cooling regime do to our energy bill if prices spike midway through winter?
• Is it safe to slow down pull-down to avoid peak tariffs, or are we gambling with disease and breakdown?

When energy was cheap and stable, those questions were academic. Now they are the difference between a store that quietly earns its keep and one that quietly drains the business.

Infrastructure strain – grids and equipment showing their age

The third force is more mundane but no less serious: the infrastructure that supports the cold chain was built for yesterday’s loads and yesterday’s climate.

On the grid side, many rural and peri-urban networks are:

• carrying more peak demand than they were designed for,
• increasingly affected by storms, heatwaves, wildfires and flooding,
• and being asked to integrate more intermittent generation (solar, wind) without the corresponding investment in flexibility.

That shows up in:

• more frequent brief outages and voltage dips,
• longer restoration times after major weather events,
• occasional deliberate load shedding or local constraints.

At the same time, on-farm and site-level infrastructure is aging too:

• older compressors and fans running close to their mechanical limits,
• control systems based on obsolete components that are difficult to repair,
• cables, switchgear and backup generators sized for a gentler era of demand.

When everything is under stress – the grid, the site wiring, the motors, the electronics – the margin for error shrinks. A small fault that would once have been shrugged off can now cascade: a voltage dip trips a compressor, the store warms, an overworked backup tries to catch up, and one more component fails.

Why it feels different from previous “tough years”

Farmers have always dealt with difficult seasons. What makes the current situation different is that:

• the challenges are systemic rather than episodic – patterns, not one-off freak years,
• they strike after harvest as well as before – the risk does not end when the crop is in,
• and they interact – hot harvest plus expensive energy plus a grid wobble is a very different scenario than “just a hot autumn”.

In other words, the cold chain feels fragile because it is absorbing pressure from directions it was never really designed to handle, all at once:

• buildings sized and insulated for a cooler world,
• cooling plant installed when power was cheaper and simpler,
• control philosophies written for slow, predictable seasons,
• all now trying to cope with hotter intake, fewer cold nights, twitchy grids and volatile energy prices.

The question is no longer whether the cold chain can survive the odd difficult year. The question is whether it can be reshaped fast enough to handle a new normal where difficult years come more often – and where the cost of getting storage wrong is higher than ever.

When climate meets concrete and steel

Most existing potato stores and cold facilities were designed for a different climate. Their envelopes, insulation levels, ventilation concepts and refrigeration capacity were sized for:

• typical harvest temperatures at the time of construction,
• historical winter averages,
• and a certain pattern of cold nights and cool days to lean on.

In many regions, those baselines have shifted:

• harvest periods more often exceed 15–18 °C at lifting,
• nights that used to drop close to freezing now sit stubbornly above 5–7 °C,
• mid-winter thaws are more frequent, bringing warm, damp air,
• and heatwaves in shoulder seasons increase the load on any store still holding potatoes.

Concrete, steel and timber do not adapt by themselves. They hold the original assumptions until something breaks: compressors that cannot keep up, fan motors that overheat, piles that never quite cool, condensation that appears in new places.

Design margins that felt generous twenty years ago are now being eaten into by outside conditions.

Energy costs: from background noise to strategic risk

Electricity and fuel costs were once just another line in the budget. Today, they can be the difference between a profit and a loss in storage-heavy systems.

Key shifts include:

• higher baseline energy prices in many regions,
• more frequent price spikes at peak demand times,
• increasing use of demand charges and complex tariffs,
• and policy-driven changes in how carbon-intensive power is priced and supplied.

For a bulk storage operator, this means:

• every cooling decision has a cost implication that can no longer be shrugged off,
• “just run the fans all night” is no longer a harmless default,
• and any inefficiency – poor insulation, leaky doors, bad airflow, obsolete motors – shows up brutally on the bill.

Energy is now a risk, not just a cost: a few weeks of unexpected heat plus high tariffs can wipe out a thin margin. That pushes storage planning closer to the heart of the business discussion.

Grid reliability and the 3 a.m. question

There is another, more existential dimension: reliability.

Storms, heatwaves, wildfires and aging infrastructure have all contributed to:

• more frequent short outages,
• longer restoration times in some rural areas,
• voltage dips and surges that trip sensitive equipment,
• and, in some countries, deliberate load shedding.

Every storage manager now lives with a version of the same 3 a.m. question: If the power goes off for six hours at the wrong moment, what happens to my pile?

The answer depends on:

• store insulation and thermal mass,
• ambient conditions during the outage,
• how close the crop already is to critical thresholds (temperature, CO₂, humidity),
• whether there is backup generation – and what it can actually power,
• and how quickly systems restart cleanly when power returns.

In a warming climate, outages during hotter periods do more damage. In energy-constrained systems, backup capacity is not guaranteed. That combination forces a new seriousness about redundancies, alarms, and scenario planning.

Designing potato stores for an unstable outside world

When outside weather was more predictable and energy felt cheap, many potato stores could afford to be “good enough”. A bit of leakage, slightly uneven airflow, basic controls – the crop usually survived, and the bill was tolerable.

Those days are fading. Hotter harvests, warmer winters, erratic storms and fragile grids are forcing a different standard. New or upgraded stores now have to be designed as climate buffers and energy managers, not just big insulated sheds.

Several design principles are becoming non-negotiable.

Building envelope – stopping the invisible leaks

The first job of a modern store is simple: keep whatever climate chaos is outside from leaking straight in.

That means more attention to:

• Insulation quality and continuity – not just thicker panels, but proper detailing at joints, corners and penetrations. Gaps, compressed insulation and “cold bridges” bleed energy and create condensation points.
• Roofs – in many older buildings, roofs are the worst offenders: poorly insulated, full of gaps and exposed to intense solar gain. Modern designs increasingly favour high-R roofs, light-coloured or reflective surfaces, and proper vapour control.
• Doors and loading areas – leaky, uninsulated doors undo a lot of good work elsewhere. Well-fitted, insulated doors with decent seals, rapid open/close mechanisms and, where feasible, vestibules or air curtains can cut losses dramatically.
• Foundations and floor edges – perimeter insulation and careful detailing at slab–wall junctions reduce cold bridges and floor condensation, particularly in humid climates.

In practice, this is often the cheapest long-term “cooling system” you can buy. Every kilowatt-hour not lost through a bad door or roof is one the refrigeration plant does not have to replace.

Air distribution – reaching every corner of the pile

Once the building envelope is doing its job, the next challenge is moving air where it is needed.

In a more volatile climate, small dead zones are not just technical imperfections – they are where disease and breakdown start. Good design now means:

• Matched ducts and fans – airways sized and laid out so that the fan’s capacity is actually delivered, not choked by undersized channels or sharp bends.
• Even back-pressure – avoiding layouts where some bays or zones are easy to blow through and others are effectively “uphill”. Balancing dampers, thoughtful duct routing and sensible pile heights all play a role.
• Realistic fill heights – huge, over-tall piles may look efficient on paper but can be very difficult to ventilate properly, especially if tuber temperatures are high at intake.
• Baffles and false walls – simple, cheap structures that guide air through the crop instead of letting it shortcut along the ceiling or empty alleys.

Designing airflow is about accepting that hot harvests and disease-stressed crops will show up more often, and that there has to be a plan to pull heat and moisture out of every part of that pile.

Flexible ventilation – more than “fans on at night”

Traditional ambient ventilation was built around a stable pattern: cool, dry nights; cooler days; reliable seasonal cooling. In many regions, those patterns are now uneven at best.

Newer store designs try to build in ventilation flexibility:

• the ability to recirculate internal air when outside conditions are unhelpful (warm, wet, smoky, dusty),
• the option to blend a controlled proportion of outside air with recirculated air to fine-tune cooling and drying,
• and the capacity to switch between “drying mode” and “holding mode” without wholesale system changes.

This usually means more dampers, better-placed inlets and outlets, and control systems that can handle more than a simple on/off logic. It also requires enough sensor coverage to know when outside air is truly an asset – and when it is just bringing in warm moisture and risk.

Right-sized, staged refrigeration – avoiding all-or-nothing cooling

Refrigeration plant sized for a cooler past can struggle after a string of hot harvests. But simply installing a massive new chiller is rarely the smartest answer.

What is working better in many designs is:

• staging – multiple smaller compressors and evaporators instead of one or two big units, so capacity can be ramped up or down in steps,
• variable-speed fans and pumps – matching airflow and coolant flow to real demand rather than running everything at full power all the time,
• zoned circuits – allowing one part of the store to be cooled more aggressively while another coasts, depending on crop, risk and market plans.

The aim is to keep the crop within a narrow temperature band with as few peaks and troughs as possible, using the minimum energy needed. In an unstable outside world, over-cooling and then reheating (or constantly overshooting and correcting) becomes a very expensive habit.

Zoning stores – not everything needs the same climate

Historically, many stores were designed as one large space with more or less the same conditions everywhere. That is rarely optimal now.

More advanced designs allow:

• different bays or rooms to run at different temperatures and humidities,
• high-risk or long-term lots to be placed in the most tightly controlled zones,
• short-term or low-risk lots to sit in simpler, cheaper spaces,
• and the ability to empty and clean one zone while others remain in operation.

Zoning adds some complexity to ducting, controls and layout. But it pays back in flexibility: growers and buyers can match product risk, value and expected storage duration to the right part of the system instead of forcing everything into a single compromise setting.

Monitoring and sensing – designing for visibility, not guesswork

In the past, many stores relied on one or two wall thermometers and a “hand and nose” check. In a warmer, more volatile world, that is no longer enough.

Modern designs increasingly include:

• multiple tuber probes at different depths and positions in the pile,
• air temperature and humidity sensors in key duct and headspace locations,
• differential pressure sensors to confirm that air is actually moving through the crop,
• basic CO₂ measurement in high-density storage to avoid invisible stress,
• and, where budgets allow, integrated energy metering so managers can see the cost impact of different regimes.

Crucially, these sensors need to be accessible for cleaning and calibration. Good design avoids burying them behind structures, up unreachable rafters, or in positions where dirt and condensation constantly foul them.

The point is not to smother the store in electronics, but to ensure that when outside conditions become weird or energy prices spike, the manager is not flying blind.

Designing for cleaning, maintenance and people

Finally, in an unstable outside world, stores have to be maintainable. Poorly cleaned and poorly maintained stores are more vulnerable when stress hits.

Thoughtful design looks after:

• smooth, washable surfaces on walls, floors and ductwork to make cleaning practical,
• minimal dust-traps and ledges that collect debris and spores,
• safe access to fans, coils, dampers and sensors for inspection and repair,
• logical layout of control panels and alarms where people actually work, not hidden in back rooms.

And it considers the people who will run the building:

• clear sight-lines where visual checks matter,
• safe walkways and lighting so night inspections are realistic,
• space to move equipment in and out for maintenance without gymnastics.

In other words, the store is designed as a workplace as much as a machine. In a world where weather, energy and disease are all more aggressive, that human-centred design is not a luxury – it is part of resilience.

Taken together, these design choices reflect a simple shift in thinking: stop assuming the outside world will be kind, and start building potato stores that can stand between the crop and whatever the weather, the grid and the market decide to throw at them.

Smarter control, not just bigger kit

The first instinct when storage starts to struggle is often mechanical: bigger compressors, more fans, higher horsepower. It feels concrete. You can point to a new chiller and say, now we’re covered.

But in a warming, energy-constrained world, that instinct can become very expensive, very quickly. Oversized plant that is badly controlled will still waste energy, still overshoot temperatures, still create condensation, and still stress the crop. It will just do it with a larger electricity bill.

The deeper shift the cold chain needs is not only more capacity – it is more intelligence in how existing capacity is used. That is where control comes in.

From “set and forget” to continuous steering

Traditional control in many stores is brutally simple:

• a couple of thermostats
• fans run at full speed when temperature exceeds a setpoint
• outside-air louvres open when it is cooler outside than inside
• refrigeration comes on in big, chunky cycles

This works tolerably when:

• intake temperatures are modest,
• outside air is consistently cold and dry,
• energy is cheap,
• and the crop is fairly forgiving.

Those conditions are becoming rarer. With hotter harvests, erratic outside conditions and volatile power prices, crude on/off control creates problems:

• temperature swings through the pile,
• frequent condensation events as air repeatedly jumps across dew point,
• wasted energy from over-cooling and then reheating,
• unnecessary fan hours that dry the crop and inflate the bill.

Smarter control is about turning storage from a set and forget system into one that is continuously steered – gently, precisely, and with clear priorities.

What smarter control actually looks like in practice

Smarter control does not necessarily mean a fancy, expensive platform. At its core, it has a few recognisable features:

• More input signals – the system watches not just a single air thermometer, but several tuber temperatures in different zones, air temperature and humidity, and sometimes CO₂ and outside conditions.
• Rules based on conditions, not just time – instead of “fans always run at night”, the logic might be “run fans when tuber temperature is above X and outside air is at least Y degrees cooler and humidity is below Z.”
• Variable effort – fans and compressors can run at part load, not just on/off, so the system can nudge temperatures rather than slam them.
• Clear priorities – for example: crop safety first, energy management second, then fine-tuning quality factors like sugar levels or skin condition.

That shift – from blunt, time-based control to condition-based steering – makes a huge difference when outside weather is misbehaving or energy is expensive.

Reducing temperature swings instead of chasing them

One of the most damaging patterns in poorly controlled stores is oscillation:

• pile warms up
• system kicks in hard, over-cools parts of the crop
• fans and refrigeration switch off
• warm air or warmer parts of the pile drift back in, moisture condenses, temperature rises again
• cycle repeats

Every swing:

• stresses tubers,
• encourages condensation and disease,
• and wastes energy.

Smarter control aims for flat lines:

• slow, steady pull-down from intake temperature to the target,
• then tight bands – for example, ±0.5–1.0 °C around the setpoint rather than big swings,
• steady, low-intensity airflow rather than violent bursts.

Variable-speed drives on fans and compressors are key enablers. Instead of a fan that is either off or at 100 percent, the system can run it at 20, 40, or 60 percent as needed. That allows:

• gentle, continuous airflow to keep conditions uniform,
• brief increases when a hotspot is detected,
• and real energy savings compared to hammering the pile with full-speed air that it does not need.

Using outside air as a tool, not a hope

In a cooler past, “fans on at night” was often good enough. Outside air was usually colder and drier than the store, so any time the louvres were open, you were winning.

Now, nights are often:

• barely cooler than the store,
• much more humid,
• or, in some regions, smoky or dusty.

Smarter control systems treat outside air as a conditional asset, not a permanent gift. They continuously compare:

• outside air temperature and humidity,
• store air and tuber temperatures,
• and possibly dew point and CO₂ levels.

Then they decide:

• whether to use outside air directly,
• whether to use it blended with recirculated air,
• or whether to keep the store effectively closed and rely on internal mixing or mechanical cooling.

This avoids the trap of dragging in warm, wet air simply because “it’s dark, so we should be ventilating”.

Linking control to energy realities

One of the biggest opportunities in smarter control is aligning it with the actual cost of power.

Even simple systems can:

• avoid starting major loads at known tariff peaks,
• schedule the heaviest cooling when energy is cheaper, as long as the crop is kept within safe limits,
• and stagger the start-up of large motors after a power dip, instead of everything kicking in at once and tripping breakers.

More advanced setups can go further:

• pre-cool the pile slightly before an expected high-tariff period or predicted heat spike,
• temporarily relax non-critical setpoints (by a fraction of a degree) to avoid running compressors during the most expensive hours,
• participate in demand-response programmes, earning money by briefly dropping load when the grid is under stress.

The art is in putting guardrails around this flexibility. Crop safety and quality cannot be sacrificed for tariff games. Smarter control means building in hard limits:

• maximum allowable tuber temperature,
• minimum allowable temperature for dormancy and sugar stability,
• maximum acceptable rate of temperature change.

Within those limits, though, there is often more room to manoeuvre than old control philosophies ever used.

Making smarter control work on smaller farms

It is easy for these ideas to sound like they only belong in massive, fully automated facilities. In reality, smaller farms can benefit too, even with modest budgets.

For example:

• replacing a single crude thermostat with a small controller that reads a handful of tuber probes and an outside sensor,
• fitting variable-speed drives to the main fans and programming a couple of simple rules about when they ramp up or down,
• adding a humidity sensor and using it to prevent unnecessary drying,
• wiring in a basic alarm system that texts a phone when temperatures, humidity or CO₂ wander out of range.

None of this requires a top-end SCADA system. But it does require:

• a clear conversation with a competent electrician or controls technician,
• a willingness to rethink long-standing “we’ve always done it this way” routines,
• and a bit of time at the start of each season to set things up properly.

The human side of smarter control

No control system, however clever, will perform well if people do not understand it or trust it.

Two recurring pitfalls are:

• systems that are too black box – nobody knows what the logic is doing, so manual overrides become the norm every time something looks odd,
• and systems that are too complicated – dozens of menus, cryptic alarms, no quick way to see what is really happening.

Smarter control works best when:

• the logic is documented in plain language (“if outside air is at least 3 °C colder than pile average and humidity is below X, then…”),
• dashboards show a few key numbers clearly – tuber temperature range, air temperature, humidity, fan/compressor status,
• store managers are trained to read those screens and understand what the system is trying to achieve,
• and manual override is still possible, but used as a deliberate decision with notes, not an instant reflex.

In other words, control should support human judgement, not replace it. The goal is a partnership: the system handles the constant small corrections; people handle the big calls when something unusual happens.

Why smarter control often beats “more metal”

There will be cases where extra capacity really is needed – a store built in the 1980s with minimal insulation and a small chiller simply cannot handle today’s hot intake. But in many situations, the first, most cost-effective gains come from:

• seeing what is actually happening in the pile,
• stopping obvious over-cooling and unnecessary fan hours,
• smoothing out temperature swings,
• and coordinating cooling with both weather and energy prices.

That is the essence of smarter control, not just bigger kit. In a harsher climate, with edgier energy and less room for mistakes, it is not the shiniest plant that wins – it is the plant that is used with the most precision, restraint and understanding.

From diesel gensets to renewables and flexibility

Backup generation used to mean one thing: a diesel genset in the yard, sized to run at least the critical loads.

That model is under scrutiny:

• diesel is expensive and emissions-intensive,
• some jurisdictions are tightening rules on backup generator operation,
• and fuel security itself can be a concern in prolonged crises.

At the same time, the broader energy system is shifting toward:

• more solar and wind on the grid,
• time-of-use pricing and incentives for flexible loads,
• and, in some regions, support for behind-the-meter renewables and storage.

Potato cold chain actors are starting to explore:

• rooftop or ground-mounted solar to offset daytime loads, especially in packhouses and processing-linked stores,
• battery storage to ride through short outages and shave peaks,
• hybrid backup – smaller diesel or gas units combined with batteries and smarter load shedding,
• demand-response participation – agreeing to reduce or shift load at critical grid moments in exchange for payment or tariff benefits.

These are not trivial investments. They require careful sizing: how much of the load really needs to be covered in an emergency, and for how long? Which fans, compressors and controls are truly critical, and which can safely be cycled down?

But the direction of travel is clear: resilience will increasingly mean a mix of on-site capability and smarter interaction with the grid, not blind reliance on a single back-up genset that “should be enough”.

Rethinking contracts and who pays for resilience

One of the more awkward realities is that most storage investments sit on the grower or local operator’s balance sheet, while many of the benefits and demands sit further down the chain.

Processors, retailers and seed customers increasingly expect:

• year-round availability,
• tighter specifications,
• assurances of cold chain integrity,
• low waste and strong sustainability credentials.

But:

• they do not always pay a premium that reflects the cost of building and running resilient, low-loss, low-carbon stores.

As energy and climate pressures rise, this imbalance becomes harder to sustain. It raises uncomfortable questions:

• Who pays for insulation upgrades, refrigeration overhauls, solar and batteries?
• Should long-term contracts explicitly include a storage quality and resilience component – and a price for it?
• How are losses and breakdowns shared when they are driven partly by systemic factors, not just local mistakes?

Some regions and supply chains are experimenting with:

• storage-inclusive pricing models – where the fee reflects both the market value of the potatoes and the cost of storing them to specification,
• joint investment – processors co-financing major storage upgrades in return for priority use and quality assurance,
• performance-linked bonuses – rewarding low loss, high quality and documented energy/carbon performance.

These are early steps, but they reflect a broader truth: the cold chain cannot be reinvented on the backs of undercapitalised operators alone.

Policy, reporting and the carbon debate

Potato storage and logistics are increasingly in the sights of carbon accounting and sustainability reporting.

Pressure points include:

• national and regional climate targets that push for efficiency and decarbonisation in agriculture and food,
• retailer and processor commitments to “net zero” or science-based targets that include upstream and downstream emissions,
• and public concern about food waste, which often peaks in storage and logistics.

For the cold chain, this is both a threat and an opportunity:

• poorly insulated, inefficient stores with high breakdown losses will look bad in any lifecycle assessment,
• but well-designed, well-managed cold chains that minimise waste and use energy efficiently can be part of the solution.

In some policy environments, this may unlock support:

• grants or tax incentives for energy-efficient upgrades,
• programmes that co-fund renewable integration,
• support for training and digitalisation.

The risk is that climate and energy policy is written without a clear grasp of how sensitive potato storage is to small changes in temperature, humidity and reliability. The sector will need to explain its realities clearly – not to avoid change, but to steer it in practical directions.

What this means for farmers and storage managers

At ground level, all the talk about grids, tariffs and climate boils down to a simple reality: the cold chain is now as critical to business survival as seed quality or land choice. For growers and storage managers, that means shifting from “keeping the store running” to actively managing risk.

Several practical implications follow.

Treat storage as a strategic crop input, not a sunk cost

For many operations, storage has historically sat under “overheads”. In a warming, energy-constrained world, it belongs in the same mental category as:

• seed and variety choice
• fertiliser strategy
• irrigation investment
• crop protection plans

In practice, that means asking before each season:

• Which part of my margin is effectively being gambled on storage performance?
• If energy prices spike 30 percent during the storage period, what does that do to the business?
• Am I putting my highest value or highest risk crop in the building best suited to protect it?

This mindset shift sounds abstract, but it changes decisions: which stores to upgrade first, which lots to put where, how long to hold potatoes when markets are flat, and when to walk away from marginal storage decisions.

Know your stores as well as you know your fields

Most farmers can describe their fields from memory: where the sand ridge runs, which corner stays wet, which block always runs short on nitrogen. In the future, the same familiarity will be needed for stores.

For each building, it is worth being able to answer:

• How old is the insulation, and where are the obvious weak spots (doors, roof, corners, joints)?
• Where have hot spots or condensation patches tended to appear in past seasons?
• Are there areas of consistently poorer airflow – corners, end bays, under gantries, behind pillars?
• What is the real cooling capacity at typical harvest temperatures, not just on the spec sheet?
• Which motors, fans or compressors are close to the end of their life?

A simple “store passport” for each building – one or two pages kept with the records – can be a powerful tool:

• basic construction details
• known issues
• past breakdowns
• energy use in a typical season
• any modifications made

That document makes it easier to prioritise investments and to brief contractors, staff and, where relevant, buyers or lenders.

Planning for energy risk, not just energy use

It is no longer enough to know what your typical electricity bill looks like. You also need a feel for how sensitive your storage is to price and supply shocks.

Useful steps include:

• reviewing your tariff structure – when is power most expensive, and by how much?
• installing simple sub-metering to see which stores or pieces of kit are the main energy users
• estimating the cost per tonne of storage energy for different crops and markets
• running “what if” numbers: what happens to storage cost per tonne if tariffs increase by 20 or 40 percent mid-season?

Armed with that information, you can start to:

• shift heavy cooling and ventilation to cheaper tariff periods where possible
• adjust pull-down speed to balance crop safety against peak costs
• make more informed choices about holding crops longer versus selling earlier at a lower price but with lower energy exposure

Energy will always be a major line item. The goal is to avoid being surprised by it.

Have a realistic power-outage plan – and rehearse it

Every storage site needs more than a vague hope that “the power doesn’t go off”. The question is not if there will be an outage, but when and how long.

A practical plan should cover:

• who gets called first (and who is the backup if that person is away)
• which systems are absolutely critical (fans, controls, some lights, not necessarily all kit)
• how long each store can hold its temperature without active cooling under different outside conditions
• what can be switched off or slowed if running on limited backup power
• how to restart systems safely after an outage without shocking the crop or tripping equipment

On sites with generators or hybrid systems, it is important to be very clear on:

• what the generator can actually power at once
• how much fuel is on hand and how long it lasts under realistic load
• how often the generator is tested under load

A short, written checklist near the control panels can turn panic into action when the lights go out.

Invest in people, not just steel and electronics

Even the best storage system is only as good as the people running it. In many operations, storage is still “what we do after harvest” rather than a defined role.

Where possible, it helps to:

• name a primary storage lead – someone who feels real ownership of the piles and the kit
• give that person time and training, not just blame when something goes wrong
• bring them into pre-season planning discussions about varieties, harvest blocks, expected risk levels and market plans
• encourage them to keep basic logs: when settings were changed, why, what effect it had

Short, focussed training – whether from suppliers, independent advisers or peer groups – can pay back quickly:

• better cure periods
• fewer hot spots
• more targeted ventilation
• earlier detection of trouble

In a harsher environment, the skill of a good store manager becomes a competitive advantage, not just a nice bonus.

Use simple monitoring before chasing “big data”

Not every farm needs a cutting-edge digital platform. But almost every storage operation benefits from a few basic, reliable measurements:

• air temperature and humidity at key points in the store
• tuber temperature at multiple depths and positions
• a record of fan run hours and cooler run hours
• visual checks for condensation, soft spots, odours and CO₂ (where sensors are available)

Even a basic spreadsheet or notebook, updated weekly, can reveal patterns:

• stores that are consistently harder to cool
• settings that drive more shrink or more sprouting
• early hints of disease problems before they become visible on the line

If and when you move to more advanced monitoring or automation, those simple records become a useful benchmark to check whether the fancy system is actually delivering improvements.

Talk honestly with buyers about storage reality

Many of the pressures described in this chapter – hotter harvests, higher energy prices, grid fragility – are outside the farm gate. Yet their consequences show up on the farm: in loss rates, downgraded loads and capital needed for upgrades.

It is increasingly important to:

• explain to processors or packers how storage risk is changing on your farm
• be clear about what your current stores can and cannot do, especially for long-term programmes
• push, where you can, for contract structures that recognise storage cost and risk – not just field production costs

That might mean:

• negotiating shorter storage windows for certain lots
• agreeing quality bands and price adjustments that reflect more variable seasons
• exploring co-investment in high-spec stores where both parties stand to benefit

Not every buyer will be receptive. But staying silent about storage realities guarantees that pressure remains one-sided.

Seven questions to ask yourself before the next storage season

To make this concrete, here are seven blunt questions a farmer or storage manager can use as a quick self-check:

1. If I rank my stores from “most resilient” to “most vulnerable”, do I know which is which – and why?
2. Which one low-cost upgrade (door seals, baffles, sensors, simple metering) would most reduce risk or energy waste this year?
3. Do I have at least a basic written power-outage plan, and does everyone who needs to know it actually know it?
4. Which lots this year are likely to be highest risk in storage (hot harvest, immature skins, disease pressure) – and am I planning to put them in the safest building I have?
5. Have I looked at last season’s energy use in enough detail to know where the biggest savings might be?
6. Is there one person on this farm who genuinely “owns” storage performance – and do they have the authority to make decisions when it matters?
7. If a buyer asked me tomorrow how climate and energy are affecting my storage, could I give a clear, confident answer?

There are no perfect answers to most of these questions. But thinking them through – and acting on even one or two – moves storage from the category of “things we hope go well” into the category of “things we are deliberately managing”.

In a warming, energy-constrained world, that shift will decide not only how well potatoes keep in the dark, but how well the businesses behind them keep going.

A quieter revolution in the cold chain

Reinventing potato storage in a warming, energy-constrained world will not come as a single breakthrough or a landmark policy. It will arrive the way most real change in agriculture arrives: quietly, unevenly, through hundreds of small decisions on farms, in co-ops, at packhouses and in processing companies.

Most of those decisions will look modest on paper:

• upgrading one old, leaky door with a properly insulated, well-sealed one
• adding a few extra temperature probes into the pile and actually checking them
• fitting variable-speed drives to fans when they finally need replacing
• installing a row or two of solar panels on a packhouse roof and using them to run the cold plant at midday
• rewriting a contract clause so that long-term storage quality and energy risk are explicitly recognised

None of these steps will make the trade news in the way a new mega-processing plant or a headline variety release might. Yet, over time, they accumulate. They change what “normal” looks like.

At farm level, the revolution may simply look like this:

• older, worst-performing stores quietly disappear or are relegated to short-term holding,
• the best stores are used more strategically for the highest-value or highest-risk lots,
• storage leads keep better records, ask harder questions about energy and risk, and are given more say in planning,
• capital plans start to include “envelope and control upgrades” alongside tractors and harvesters.

At the co-op or group level, it might show up as:

• shared investment in a modern, high-specification facility that replaces a scattering of tired, inefficient sheds,
• joint training days where storage managers compare notes on breakdowns, energy bills and disease outcomes instead of keeping quiet out of embarrassment,
• bulk purchasing or service agreements for sensors, control systems and maintenance, making good technology affordable to more members.

Further down the chain, quiet change will look different again:

• processors and retailers who once assumed storage performance now asking detailed questions – and sometimes offering to co-invest in better infrastructure,
• logistics providers experimenting with more efficient, mixed-temperature loads and better route planning to reduce time out of temperature,
• specifications that move away from punishing minor cosmetic defects into reward structures for low waste and documented cold chain integrity.

Policy and finance will play their part, often in the background. A grant scheme that helps pay for better insulation, a low-interest loan for renewables on cold stores, a carbon programme that finally counts reduced storage waste as a real gain – these things are not dramatic, but they change the maths. Bank managers and boards become more willing to sign off on upgrades that previously felt like luxuries.

There is also a cultural element to this quieter revolution. For years, storage has been something many people only talk about when something goes wrong: a breakdown, a lost pile, a rejected load. In the next phase, the industry will need to talk just as openly about what goes right:

• stores that ride out a heatwave or a power cut with minimal loss
• seasons where good curing and tight control cut shrink noticeably
• teams that manage to stretch a difficult crop safely through to a better market window

Those stories do not flatter any single product or company. They highlight competence, planning and design. But they also shift attitudes: storage stops being an afterthought and becomes a source of quiet pride and competitive advantage.

In the end, the cold chain will still be what it has always been for potatoes: the backbone that nobody outside the industry thinks about. The difference is that in a harsher climate, with more expensive and fragile energy, that backbone will have to be stronger, smarter and fairer in how its costs and responsibilities are shared.

That strengthening will not arrive with fanfare. It will arrive one better-insulated wall, one smarter control system, one improved contract, one well-handled outage at a time. Looking back a decade from now, the sector may realize that it has been living through a revolution in the cold chain – not because everything changed overnight, but because enough people decided, quietly but consistently, that “good enough” storage was no longer good enough.

Author: Lukie Pieterse, Potato News Today
Image: Credit Potato News Today