I'd advise Slashdot readers to take their typical tack, and not read the linked articles. They are crap. However (again, much like Slashdot), the comments can be enlightening.
What I'm seeing there is:
d) Norway's power grid is so dirty that it is fooling the cables. That's the issue, near as I can tell.
The power grid is not dirty, but uses a different system with no neutral wire and the voltage will therefore be floating with respect to earth. Tesla cables detect this as an earth-fault and disconnect.