How sustainable is cold chain logistics really?

Cold chain logistics consumes a lot of energy. That is no secret, and it is not going to change. So, the real question is not whether it uses energy, but how efficiently you meet that demand and how much of the environmental impact you can take out.

The short answer: cold chain logistics, especially freezer storage, is inherently energy-intensive, but its footprint is not fixed. Almost every link in the chain, from warehouse design to transport route, leaves room for improvement. Sustainable cold chain logistics does exist. It just does not happen on its own. It is a matter of choice.

What separates a wasteful cold chain from an efficient one is less and less the cold itself, and more and more how actively you manage it. Where refrigeration systems used to be set fairly statically, the sector now adjusts continuously based on real-time data. That is exactly where the levers are.

An ordinary warehouse keeps products dry and protected. A freezer warehouse has to stay below -18°C at all times, regardless of the weather outside, how often the doors open, or how full the room is. The compressors never stop, not even at night or on weekends. Every time a door opens, warm air flows in and has to be removed again. And because a broken cold chain makes products unsafe, backup systems run as standard.

The result: a cold storage warehouse quickly consumes up to 6 times more energy than an ordinary ambient warehouse. Most of this goes towards the cooling system itself, accounting for 70 to 80% of total electricity consumption.

The energy demand of cold storage will not disappear, but you can meet it far more intelligently. Five levers make the difference.

The insulation value of a refrigerated room largely determines how much energy is needed to maintain temperature. Modern frozen warehouses use high-quality sandwich panels (alt: insulated panels, insulated sandwich panels), thermal doors and smart airlock systems that minimise heat loss during transit. A well-designed cold room simply needs less energy than ageing infrastructure, even at the same occupancy.

Energy management in frozen logistics starts with visibility. With real-time monitoring of temperatures, energy use per zone and compressor load, you can spot anomalies quickly. Much of the energy loss in cold warehouses comes from small leaks, poorly calibrated systems or inefficient cooling cycles, problems that stay invisible without the right data.

A concrete example: adaptive defrost control based on pressure-differential measurement rather than fixed timers can reduce energy use during defrost cycles by 20 to 30%.

Insight alone is not enough; you also have to act on it. At WSC, we therefore tackle one of the biggest hidden energy losses: the time a loading dock stays open. Trucks book a time slot in advance, but in practice they often arrive earlier or later. That is why our operators never open a dock based on the theoretical agreed arrival time, but only once the truck is actually at the dock. And as soon as it leaves, the dock closes again immediately. Electronic alerts support this process. Every minute a dock stays closed is energy the refrigeration system does not have to make up for.

A half-full cold facility is not half as cheap as a full one. The fixed energy cost stays virtually the same, regardless of how much product is inside. Worse still, the variable share rises disproportionately when space sits empty: the emptier the space, the harder the cooling has to work to keep the temperature stable. A full room holds the cold far better. That makes efficient stock rotation and a good occupancy rate essential, not only for costs but also for the CO2 footprint per pallet. The same goes for transport: a half-full refrigerated truck is never a sustainable solution.

The key lies in consolidating loads from different customers heading to the same destination, route planning that takes loading capacity and delivery windows into account, and accurate demand forecasting to optimise stock levels.

At WSC, we approach this in two ways. With a network study, we determine the geographically optimal storage location for each customer, so that as few kilometres as possible have to be driven afterwards. The load factor of the trucks themselves is optimised using specialised planning tools that map out the routes, maximise the load and, where possible, combine several customers in the same vehicle. That way we avoid empty or half-full vehicles on the road.

A growing number of logistics players install solar panels on warehouse roofs to cover part of their energy needs with green power. At WSC, we go far with this: all our buildings are fitted with solar panels, supplemented on some sites with wind turbines.

To make the most of that green energy, we also use batteries at our sites. After all, solar panels generate power when the sun shines, not necessarily when consumption peaks. Battery storage lets us buffer the energy we generate ourselves and deploy it when the refrigeration system needs it, instead of having to feed it straight back to the grid. That way we get the maximum return from every kilowatt-hour we produce ourselves.

The warehouse is only one link. Refrigerated transport is at least as decisive for overall sustainability. Refrigerated trucks run on diesel, and the cooling system on the trailer, the Transport Refrigeration Unit (TRU), runs on its own diesel engine, separate from the vehicle. Vehicles fitted with a TRU therefore emit around 15% more CO2 than standard trucks, and their nitrogen oxide emissions can be up to 18% higher. The electrification of refrigerated trailers is well under way, but for most companies this move towards greener operations is slow. At WSC, we step up the pressure by investing heavily in sustainable transport and the greening of our distribution fleet.

What already makes a difference today:

The pressure is rising regardless: the revised European CO2 standards for heavy-duty vehicles, enshrined in law in 2024, require a fleet-average CO2 reduction of 45% by 2030, 65% by 2035 and 90% by 2040.

In frozen storage, food safety and sustainability inevitably go hand in hand. Energy savings must never come at the expense of temperature control, but modern systems show that the two are perfectly compatible.

Smart refrigeration compressors continuously adjust their capacity to actual demand, instead of always running at full power. That delivers savings without any compromise on food safety.

What is more, preserving quality is itself a form of sustainability. Every pallet lost to temperature fluctuations is not just a financial loss, but also wasted energy, water and raw materials. The most sustainable pallet is the one that reaches the end customer intact.

For brands and retailers, there is one more reason to pay attention here: you will increasingly have to report on it. Since the introduction of the EU Corporate Sustainability Reporting Directive (CSRD), more and more companies have to map their scope 3 emissions, including those of their logistics partners.

For food and beverage companies, that is no minor detail: scope 3 can account for up to 80 to 90% of total climate impact.

This makes your logistics partner a co-determinant of your own figures. A partner who knows their energy use, can adjust it and can supply reliable emissions data makes your reporting simpler and more credible.

At WSC, we therefore systematically map our own CO2 footprint, broken down by category. That exercise immediately shows where the biggest levers lie.

What stands out: logistics and transport together make up by far the largest part of the footprint. That is precisely why we focus on smarter routes, a higher load factor and a greener fleet. It is also exactly the data we need to make our operations more sustainable together with customers, in a targeted way rather than on gut feeling.

The energy footprint of frozen storage is real. But it is not a given. Every element in the equation, warehouse design, energy source, occupancy rate, transport routes, temperature management, leaves room for improvement.

For brands and retailers in the food sector, the choice of a logistics partner is a co-determining factor in this. Those who work with a partner that knows its energy use, adjusts it and communicates transparently make their own sustainability ambitions more credible.

Frozen logistics does not have to be the weakest link in a sustainable supply chain. But it only avoids becoming that if you handle it deliberately.