500 KW (now derated to 250KW), it's neat but that's piddly little bits of power for an installation that size. A single present day wind turbine will produce up to 3 MW continuously rather than pulsed.

Pity I didn't know about it when I toured Scotland a couple of years ago looking at their renewable energy installations.

This one was by far the most impressive:

http://pics.camarades.com/v/jacques/trips/scotland08/dscf158...