Note "powered by methanol" on the hull. From Marinvest site:
"Only nine months after the delivery of Mari Jone and five months after the delivery of Mari Boyle, the two vessels, part of a series of the world’s first methanol dual-fuel tankers, celebrated a collective 2000 successful running hours on clean burning methanol. Thanks to a close cooperation between managers, charterers, engine maker and builder and the yard it has been possible to overcome many of the hurdles associated with novel technology. At the time of writing a staggering 72,000 kg of sulphur oxides emissions have been saved on these two vessels alone, thanks to the pioneering spirit and willingness to promote the environmentally friendly marine fuel showed by charterers Waterfront Shipping, a subsidiary of Methanex Corporation."