For instance, the supply of low-sulphur marine gas oil remains a concern, and other distillate alternatives available are expensive. Installing scrubbers or exhaust gas SOx cleaning systems on ships may cost $3 million–$5 million per scrubber, and LNG retrofitting is very expensive and not always feasible. Operators
therefore risk being fined for breaching emission
restrictions and some of them may, in the short
term, choose to accept this situation (IHS Maritime
Technology, 2014).