Thailand’s state energy company PTT and Malaysian shipowner AET have hooked up together to develop and build a pair of zero-emission aframax tankers that will be capable of running on green ammonia.

The two companies said on Thursday that they have signed a memorandum of understanding on the pioneering newbuildings to encourage the use of green ammonia as a main propulsion fuel.

Under this AET will select a shipyard to build the vessels which will be ordered against long-term charters with PTT.