At the moment the first and only Ion Powered space craft is the British one that was launched by the European Space Agency 4 or 5 years ago as an experimental test bed.
I think it's called ICAN 1.
The mentioned it on a science show, here in the UK, last year.
It isn't very large compared to COM SATS, being about the size of a automotive engine block.
The amount of thrust generated was quoted as, "As strong as a baby breaking wind". However, it has been orbiting the Earth for a few years, half way between the Earth and Moon, gradually picking up speed and gaining a higher orbit as it does so.
The point is that the craft has proved that a Solar Powered Ion Drive does work.
The scientists on the show, did point out that it wouldn't work so well the further away from the Sun the craft travelled, being totally dependant on Sunlight for fuel.
Still good for as far away as Saturn though.
There is a view to use it as a seconadry propulsion system on future larger space craft in a similar vien to the Particle Beam thrusters used by the Federation starships in Star Trek.