Europe's on-shore LNG tanks could be full up sometime this summer, potentially pushing gas carriers into floating storage, Flex LNG chief executive Oystein Kalleklev said on Thursday.

During the company's first-quarter earnings call, Kalleklev said Europe — home to eight of the 10 fastest-growing natural-gas importing countries — kept buying gas "hand over fist" despite the warmest winter on record in the northern hemisphere and the Covid-19 outbreak.