Grangemouth, Scotland's only oil refinery, has ceased processing crude oil after more than a century of operations.
In September last year, owner Petroineos said refining would come to a halt in 2025 as the site transitions into an import terminal for finished fuels.
The oil refinery, which dates back to 1924, is being shut down by Petroineos, with 430 jobs being lost in the process.
Unite, the union, said politicians had "utterly failed" those workers.
The BBC reports Iain Hardie, Petroineos regional head of legal and external affairs, said: "Petroineos has invested £50million in creating a modern import and distribution terminal capable of receiving finished fuels by sea for onward distribution to customers around the country.
"We will now be importing all the products necessary to meet Scotland's demand for transport fuels."