Astonishing ! I've never ever heard of this... Although I have quite good knowledge and archives on french and italian modern microcar ('voiturettes') !
It is quite intriguing, so I'll ask to some ex-bosses of Teilhol to learn a bit more about that austrian version. Anyway, I'm almost sure that it was never really produced in this version.
Anyway, on this site, we learn that it was some kind of swiss subsidiary of Steyr who has made this conversion, with electric engine.
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Just look at 'Steyr'. Now it makes some sense : it was a time when there was quite a lot trying at electrifying our voiturettes. Some has try to do it on the basis of Ligier, JDM (Solec Riva), Erad, Hodgep...
I'll let you know if I learn more with Teilhol people !