China Zorrilla starts River Plate service with 43 MWh and a 25-knot cap

A 130-metre catamaran joins the River Plate route

Australian yard Incat Tasmania built the China Zorrilla, a 130-metre aluminium catamaran, for South American operator Buquebus. New Atlas reports that it is the largest 100% battery-electric vessel in commercial service. It runs the 34-mile crossing of the River Plate between Buenos Aires and Colonia del Sacramento. It carries up to 2,100 passengers and 225 vehicles. A heavy-lift vessel transported it to South America, Renew Economy reported.

For ferry operators and the regulators who approve newbuilds, this is a full-scale working example, not a demonstration. Passengers get a quieter crossing and no funnel exhaust. The trade is speed. The build cost has not been disclosed, so the business case rests on the operators' own payback estimate.

43 MWh on board, and a speed cap

Wärtsilä and Corvus Energy supply the energy storage system, which totals 43 megawatt-hours. More than 5,000 lithium-ion batteries make up the pack, weighing roughly 286 tons. New Atlas compares that pack to hundreds of high-end EV battery packs combined. It also compares the pack to a power source that could run a small town.

Eight electric motors drive eight waterjets on the catamaran.

The ship has no direct emissions. It avoids the vibration and heavy maintenance a diesel plant of this size would bring.

The design began as a dual-fuel vessel running on liquefied natural gas and diesel. It was upgraded mid-project to go entirely electric. That decision cost speed. The hybrid version was slated for 37 knots (43 mph). The electric drivetrain caps service speed at 25 knots (29 mph). Each crossing now takes roughly 10 minutes longer.

Fuel savings versus capital cost

A conventional diesel ferry of this size on a similar high-frequency route could burn more than a million gallons of marine diesel a year. The China Zorrilla removes that bill. New Atlas puts the avoided fuel cost at US$4.5 million. The ship also avoids 37,545 tons of carbon dioxide equivalents annually.

Payback is five to eight years. New Atlas attributes that range to the operators.

That fuel figure compares with a conventional diesel ferry of the same size on a similar route. It is not a measurement of what this ship used to burn. The 34-mile crossing takes 75 minutes. That frequency shapes the economics. The battery has to earn its keep across short, repeated runs, not one long passage a day. The vessel also carries a 24,750-square-foot duty-free shop. New Atlas notes it has long been a primary revenue engine on these crossings.

Not every electric ferry closes the gap

Route profile decides more than the battery does. CleanTechnica modelled an Artemis EF-12 electric hydrofoil pilot boat for the Antwerp pilotage operator Brabo. Its fifteen-year discounted cost came to about €5.32 million, against €3.81 million for a conventional diesel tender, a premium of roughly 40%. Hydrofoils have been commercially available for decades, but their operating niche stays narrower than their technical appeal suggests.

In the central case the EF-12 spent about 6% of its underway time foilborne, and about 13% in a more favourable port-speed scenario. Those are modelled scenarios, not measurements of Brabo's operations.

Antwerp pilot boats work around locks, docks and ship movements. A high top speed buys little for much of the day. Electric propulsion still cut purchased energy, but the saving did not cover the assumed capital cost or the limited time in the efficient regime. An air-cavity electric personnel vessel from Norway's Moen Marin and Pascal Technologies fared better financially in the same exploratory comparison. The existing craft would need adaptation and certification before it could serve as a pilot tender.

What happens next on the River Plate

Robert Clifford is Incat's founder and chairman. Renew Economy's podcast says he believes electric ferries could transform global shipping.