Reefer cargo through the Port of Poti: cross-stuffing refrigerated containers without breaking the cold chain
A reefer container reaching Poti by sea is only half the journey for cargo continuing into the Caucasus or Central Asia. What happens between the vessel and the road or rail leg — whether the box stays plugged in, gets cross-stuffed into a trailer, or sits in a cold store — is where a cold chain is actually won or lost, not the transit time printed on the quote. This is about that handoff specifically: plug-in versus genset, what cross-stuffing a reefer box actually involves, and where the paperwork and the temperature log both need to match before the load moves on.
Reefer options at the Port of Poti
| Option | How it works | When it fits |
|---|---|---|
| Plug-in at the terminal yard | the box stays connected to shore power in APM Terminals Poti’s reefer racks | while it waits between the vessel and onward transport |
| Genset on a chassis or flatcar | a diesel unit clipped to the box runs the compressor for the road or rail leg | once the box leaves the yard’s fixed power |
| Cross-stuffed into a road reefer trailer | cargo moves out of the marine box into an insulated trailer with its own unit, and the box goes back to the line | for cargo continuing past Georgia into the Caucasus or Central Asia by road |
| Cold storage or bonded reefer warehousing | cargo comes out of the box entirely into a temperature-controlled warehouse | for consolidation, inspection, or a change of plan before onward carriage |
None of these four options is simply a matter of scale — a full container load that stays boxed through Georgia belongs on the yard’s fixed power for as long as it waits, while cargo continuing overland by road picks up its own diesel unit the moment it leaves that yard, and the gap between the two is exactly the moment the cold chain is most exposed.
Plug-in versus genset: two different jobs, not two names for the same thing
Plug-in power comes from a fixed source — the vessel’s own reefer sockets at sea, then the terminal yard’s reefer racks once the box is discharged — and it runs the compressor continuously off shore or terminal electricity for as long as the box stays connected, with no fuel to manage and no clock running down.
Genset power is different in kind, not just in source: a diesel generator clipped to the box takes over the moment it leaves fixed power, typically good for somewhere in the range of two to five days on a full tank depending on the unit and the load, which is a runway that has to be planned against the actual route, refuelling stops and border queues, not assumed.
Why a reefer box carries less cargo than the same dry box
A 40' reefer holds meaningfully less usable volume and less payload than a 40' dry box of the same footprint, because the insulated walls and the refrigeration unit itself both eat into space and weight that a dry box gives entirely to cargo — a load plan built on dry-box numbers for a reefer booking comes in overweight or over-cube before it ever reaches the port.
What actually happens during cross-stuffing
At Poti, a reefer box coming off the vessel goes onto shore power in the terminal’s reefer racks while it clears customs and waits for onward transport; cargo staying boxed through Georgia stays on that plug until it moves, while cargo continuing overland gets cross-stuffed — the goods move out of the marine container and into a road reefer trailer with its own genset, and the empty marine box goes back to the shipping line rather than travelling any further inland.
The moment the cold chain is most at risk
The gap between unplugging a box from shore power and getting its replacement unit — whether that’s the trailer’s own genset or a fresh genset clipped onto the same box — running at the right set-point is the single riskiest few minutes in the whole route, and it is also the easiest one to control if someone is actually watching it happen rather than assuming the handover took care of itself.
A continuous data-logger record across that gap is what turns "the cargo arrived warm" into a traceable event with a cause, rather than an unexplained loss with no way to tell whether the box, the truck, or the wait in between was where it went wrong.
What we check during a reefer cross-stuffing
| Check | What it verifies | Why it matters |
|---|---|---|
| Temperature log continuity | the data-logger readout from the marine leg matched against the readout resumed on the road or rail unit | a gap in the record is indistinguishable from a gap in cooling once a claim is filed |
| Genset fuel and runtime | the tank checked against the estimated hours to the next fuel stop or border crossing | a reefer unit that runs dry mid-route is not a paperwork problem, it is a lost load |
| Seal and door integrity | the box’s door seals and the trailer’s insulation checked before cargo transfers between them | a compromised seal defeats the whole purpose of a temperature-controlled unit |
| Paperwork match | the transport document, ATP equipment certificate and phytosanitary certificate all cross-checked against the physical cargo before it moves | a mismatch caught at cross-stuffing is cheaper than one caught at the border |
None of these checks is paperwork for its own sake — each one is the specific point where a properly cold shipment at the vessel rail can still arrive warm at the border if it gets skipped.
What can go wrong without a controlled cross-stuffing process
Most reefer claims do not come from a single dramatic failure — they come from a handful of small gaps that are individually easy to miss and collectively enough to spoil a load:
- Unplugged gap before the genset starts — the box sits without power between the yard and the road leg long enough for the internal temperature to drift
- Wrong set-point carried over — a genset started at the temperature left over from its previous cargo, not the one actually being loaded
- Broken data-logger record — no continuous log across the transfer, so a later claim has no way to prove where an excursion happened
- Fuel not topped up before a border queue — a genset that runs dry waiting at a crossing is a spoiled load, not a paperwork problem
- Load plan built on dry-box numbers — a reefer’s lower payload ignored until the box comes in overweight
- ATP or phytosanitary certificate missing at the border — caught by customs instead of caught at cross-stuffing, where it is still cheap to fix
None of this needs specialist equipment to catch, only someone at the cross-stuffing point whose job is specifically to catch it, before the box is sealed and gone.
Liability when a reefer box loses temperature
A temperature excursion sits outside the ordinary liability picture covered at CMR liability and the TIR guarantee: the CMR weight-based cap answers for loss or damage in principle, but proving a carrier caused a specific temperature failure — rather than, say, a pre-existing defect in the goods — is its own dispute, and a base cargo policy under cargo insurance pitched at ICC(C) or even ICC(B) commonly excludes spoilage from a temperature breakdown unless a reefer-specific clause is added on top.
Development prospects
Poti’s own throughput is climbing toward the terminal’s stated capacity of more than 650,000 TEU by the end of 2026, and reefer volumes on the Middle Corridor are riding the same growth that has already pulled dry container traffic through Georgia rather than around it — which points toward more reefer plug capacity and more scheduled cross-stuffing slots at the port over the next few years, not fewer, as shippers look for a cold-chain route into the Caucasus and Central Asia that does not run through Russia.
In short
A reefer box moving through Poti either stays on plug-in power for as long as it’s boxed, or gets cross-stuffed onto its own genset the moment it heads inland — and that handover, not the transit time on the quote, is where the cold chain is actually protected or lost. Tell us the cargo’s temperature range and how far inland it’s going, and we’ll set out exactly where it gets cross-stuffed and what stays on the log the whole way.
Ask about cross-stuffing your reefer cargo