[Tagging] What's a power=station?

[Steve Bennett]

According to the wiki "map features" table, a "power=station" is "A
tag for electricity stations. Wires from power lines come in or go out
here."

Two questions:
1) Does everyone use it this way? Without having looked at the table,
I would have guessed that a "power=station" was a power plant (ie, a
coal, or gas or whatever plant that generates power), whereas that
appears to be a "power=generator".
2) What is a "power station" exactly? I think I know the type of thing
it's referring to (although I have, perhaps mistakenly, called these
"sub stations" in the past). What does it do? Does it simply convert
high voltage down to lower, consumer-level voltage?

Hmm, then again, http://en.wikipedia.org/wiki/Electrical_substation
seems to use the term the way I understood it: ie, a roughly
house-sized arrangement of electrical equipment, rather than
cabinet-sized, as shown in the wiki page.

I'll then update the wiki, adding definitions for the individual pages.

Steve