The Panama Canal Authority has issued an Advisory to Shipping that changes how canceled or newly available transit slots are reallocated during certain booking periods, and how ships qualify for the canal's NetZero program on their first transit. The changes took effect immediately upon announcement.

What Changed for Transit Slot Allocation

The canal has revised the criteria used to reallocate transit slots that are canceled or otherwise freed up during booking periods 1A and 2 at the Neopanamax locks. The new rules restore the allocation approach that was in place before July 2026. Available slots in these periods will now go through a special allocation process rather than general booking.

Priority Order for Vessel Types

Under the restored system, available slots will be offered first to container ships, followed by liquefied natural gas (LNG) carriers, then liquefied petroleum gas (LPG) carriers, and finally vehicle carriers or roll-on/roll-off (RoRo) vessels. Where more than one vessel in the same category is competing for a slot, the Transit TEU Allowance (TTA) capacity will be used as the tiebreaker, where applicable. This gives container lines a clearer and more predictable priority position when canceled slots become available.

Changes to NetZero Program Eligibility

Alongside the booking changes, the canal updated eligibility requirements for vessels seeking to join the NetZero program on their first transit through the waterway. The program is designed to encourage investment in low-carbon, energy-efficient vessels. Previously, eligibility required a preliminary tonnage inspection carried out by the Panama Canal's Admeasurement Unit. Under the update, this inspection can now be conducted outside Panama. Starting November 1, 2026, vessel owners, operators, or authorized agents can request this preliminary inspection before the vessel even arrives in canal waters.

How the Preliminary Inspection Works

The advance inspection is meant to let the canal gather key information ahead of a vessel's arrival, including data needed to calculate tolls, determine tonnage under the Panama Canal Universal Measurement System (PC/UMS), identify engine type, and confirm other NetZero eligibility requirements. To use this option, applicants must submit the required technical documents, pay applicable fees, and arrange the inspection at the port where the vessel is currently located. Importantly, this preliminary inspection does not replace the final verification or any further inspections that may still be required before the vessel transits the canal.

What This Means for Shippers and Cargo Owners

For shippers and cargo owners routing freight through the Panama Canal, the restored slot allocation rules mean more predictability around how canceled or freed-up transit slots are handled, particularly for container vessels, which now sit at the top of the priority order in these special allocation windows. This could help reduce uncertainty for carriers managing tight schedules and, by extension, support more reliable transit times for container cargo moving through the canal. The NetZero inspection change is more relevant to vessel operators than to cargo owners directly, but it may encourage wider adoption of low-carbon vessels on canal routes over time. Shippers should continue to monitor booking conditions and work with carriers and forwarders to confirm transit schedules, since these rule changes affect how slots are allocated rather than overall canal capacity or transit fees. Those tracking shipments through the canal should expect no immediate disruption to current bookings, but should watch for how carriers adjust their booking strategies for Neopanamax lock transits under the restored priority system.

Sources: maritime-executive.com