Panama Canal Ship Size Decides How Much Shippers Pay for a Transit

The Panama Canal moves ships through two separate lock systems, and the one a vessel uses goes a long way toward setting what its transit costs. At the Panama Canal Neopanamax locks, which handle the longer, wider, and deeper ships, slot auction prices run very high compared with the steadier auctions on the original Panamax locks. With El Niño threatening the freshwater that feeds the locks, and lower-ranked users often left to bid for slots close to arrival, that gap carries straight through to freight costs. For charterers moving grain, fertilizer, energy, and manufactured goods, ship size is a cost decision as much as a logistics one.

Tom Beney is Senior Vice President, Ocean Freight at StoneX, where he oversees the firm's global freight strategy across tanker, dry bulk, and container markets. He works directly with shipowners, charterers, and bunker suppliers and tracks how routing decisions, slot access, and shipping costs move through global commodity trade flows.

Key Themes from the Discussion

• The Panama Canal's original Panamax locks carry a beam restriction that larger ships cannot meet.
• Larger ships use the Neopanamax locks and pay more for each transit slot.
• Neopanamax slot auction prices run very high compared with steadier Panamax auctions.

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Panama Canal Lock Systems Split Ships by Size and Beam

The Panama Canal runs two channels through separate lock systems, the original Panamax locks built by the U.S. and the Neopanamax locks added a few years ago. The original Panamax locks impose a beam restriction that caps how wide a ship can be. The newer system, Beney explains, means "they can go through the longer, wider, deeper ships and they're called the Neopanamax locks", opening the canal to vessels the original channel cannot take. Specifically, a ship's dimensions decide which Panama Canal channel it can use before any question of timing or booking arises. For charterers, vessel choice therefore also decides which slot market they end up competing in.

Ship Size Sets the Cost of a Panama Canal Transit Slot

"It does depend on the size of the ship as to which lock system you use, and therefore what the slot will cost you. The bigger the ship, the more the slot costs you," Beney says. Ship size sets the price of a Panama Canal transit slot as directly as it sets which lock a vessel can use. Slot charges are paid on top of the normal transit toll, so a larger ship carries a heavier bill at both levels. Regular, high-ranking canal users can apply for period one slots well ahead of arrival, whereas lower-ranked users are left with period two bookings or period three auctions. For owners and charterers, that makes vessel size a central line in any Panama Canal cost calculation.

Neopanamax Auction Prices Outrun the Steadier Panamax Locks

Panama Canal slot auctions price Neopanamax transits well above Panamax transits, splitting the canal into two very different cost markets. Period three slots are auctioned close to a ship's arrival, and many dry bulk operators wait for them because advance period two bookings are hard to time when ships are delayed at load ports. Competition for Panama Canal slots has also broadened, with more products moving out of the U.S. and into Asia on tankers and gas carriers, linked to disruption in the Strait of Hormuz. For shippers, the gap between the two lock systems turns lock choice into a pricing decision as much as a routing one. According to Beney, "the auction prices, particularly on the Neopanamax locks, are very, very high versus the older Panamax, which tend to be more of a steady auction price".

 

--- Written by Frédéric Guétin, StoneX Media Producer

--- Expert: Tom Beney, StoneX SVP of Ocean Freight