Yes, the "; namely," in the example sentence is correct. The portion of the sentence starting with "namely" cannot stand as a complete sentence on its own. (". Namely," would be incorrect.)
I would replace the "; namely," with ": " (A colon followed by two spaces.) This ": " introduces a list. I think "namely," is redundant after such a colon.
The two parts of this sentence should be joined by either a semicolon, an emdash, or a colon. As discussed, a colon would be redundant with "namely". Thus, a semicolon is a reasonable choice.
The comma after "namely" is natural, but optional.
I use the "Oxford comma", so I would change "Sweden and" to "Sweden, and". Some style guides insist on the Oxford comma; other style guides refuse to allow the Oxford comma.