A rise in the Annual Efficiency Ratio (AER) of four of the five steam-turbine LNG carriers controlled by US-listed GasLog Partners pushed up the company’s average AER year-on-year.

According to the second sustainability reports issued by GasLog and GasLog Partners and which cover the year 2020, the average AER — or carbon intensity indicator — of GasLog Partners' 15-ship fleet climbed from 9.37