New Zealand is mainly a green country, but that is because of rainfall. Most of its power is hydroelectric so that is 'green'. How about fossil fuel? Searching for oil deposits is no longer allowed but as the country is heavily dependent on such fossil fuel, it is imported from countries that do allow oil exploration and any risks associated with their exploration is someone else's problem.
So electric cars are heavily promoted, right? Well, they avoid road user charges and they can be given preferential treatment regarding special vehicle lanes, if local authorities wish. The first part is until 2% of cars are electric and the second I'm unsure of the coverage of that.
The downsides are NZ is fairly sparsely populated country and distances to travel are deceptively long. Charging points are not that prolific. The initial purchase cost of new cars is high. So the take up so far is conservative. As NZ does allow used imports (mainly coming from Japan), that is the most common source of electric cars joining the national vehicle fleet. That said, they are still a rare sight on the road.
The chart below is for new cars and I believe LCVs. The percentage numbers at the bottom are for annual increases, which are strong. The number of electric cars sold is still low. I personally have driven an electric car and loved it. Will I own one? As a one car family, living in an area where travelling out of town requires large distances, I won't be getting one anytime soon. That's reality.
Data source: MIA.