Terntank, a Danish owner of nine chemical/product tankers on the water, stands to boost its fleet by more than half with yet another order for innovative, dual-fuel ships in China.

The company, which already has three 15,000-dwt ships under construction at China Merchants Jinling Shipyard in Yangzhou, announced on Tuesday that it added one further firm and one optional vessel at the yard.

Previously known as AVIC Dingheng Shipbuilding, the yard will deliver the three initial vessels in 2025 and the freshly inked ones in the first quarter of 2027.

All five will be powered by gasoil, biofuels and methanol and will be ready to have sails fitted for wind propulsion.

Norway’s Kongsberg has been in charge of their design.

“We are thrilled to announce this new order, further solidifying our position at the forefront of sustainable shipping practices,” Terntank owners Tryggve Moller, Rigmor Moller, Annika Kristensson and John Sten said in a joint statement.

Terntank, a family-owned shipping company founded in 1958, has a zero-emission target for 2040.

The newbuildings it has commissioned are “crucial” to achieving that goal, the firm said on Tuesday.

In previous statements, Skagen-based Terntank said it expects its new tankers to emit 40% less CO2 than conventional vessels, with the wind element chopping a further 8%.

The company is drawing on its experience of building six other tankers at AVIC Dingheng, adding more features to reduce environmental impact.