The first unit is due for delivery by spring 2024 and will hold the class notation Prepared for Methanol C.
Longship developed the design for the 8,600dwt vessels with Ankerbeer, a Dutch naval architect.
The design adheres to the EU Stage V standards applicable to non-road mobile machinery (NRMM).
According to the Groningen-based firm, the ships include a diesel-electric propulsion technology that lowers consumption by nearly 45% in comparison with existing dominant ship types of a similar size.
The hybrid propulsion technology powering two azimuth thrusters with low rpm can be retrofitted to operate on alternative fuels.
The vessels are also said to have an optimised design for the transport of biomass solid fuels.
Longship noted: “The high cubic design featuring one fully box-shaped hold with 81.9m clear hatch opening in length is well suited for break bulk and project cargoes, and able to sail in open-top condition.”
Longship CEO Øyvind Sivertsen said: “It is our corporate goal to substantially cut emissions and carbon intensity as industrial carrier when providing bespoke logistical solutions to our clients.
“With these units, we will meet requirements well before they become mandatory to the shipping industry”.