The Greens are about as relevant politically in New Zealand as they are in Canada—that is to say, not very. In last week’s election, in which John Key's centre-right National Party defeated the Labour Party decisively, the Green Party of New Zealand won 6.5 per cent of the vote (they won 5.3 per cent in 2005). However, proportional representation enabled it to increase its presence in parliament by two seats—from six to eight.
As is the case of Elizabeth May’s Greens in Canada, the main contribution of the Greens in New Zealand is to siphon off votes from the main left-wing parties and make it easier for centre-right politicians to win.
I guess they are useful after all.