Well...
When you back yourself away from "per capita" and nations the size of one U.S. state, or nations with a population less than that of a few American cities, you get something like this:
It's a lot like countries you can drive across in an hour bragging about how easy it is for them to have a really good transportation infrastructure. I'm usually suspicious of any methodologies where nations like Denmark and Luxembourg end up on top of the heap.
The original OECD data seems to be here. I haven't plowed through very much of it.
And yes, it does mean something when nations have government-owned utilities installing technologies invented by the free market.