Question For AustraliansS

So I was poking around the Holden website building a Commodore SS-V Sportwagon and I noticed something strange. You use Kw, not horsepower, as your unit of power. The car has a 6.0 v8 making 270 Kw. Without Google, which tells me that equals 367 hp, this is about as helpful to me as Melbourne's weather forecast.

What the fuck is a Kw and why don't you use horsepower like the rest of the developed world? No wonder nobody wants to build cars there any more.