597 cars delivered in 2016, thats not volume. And they have stated that it will not be availabe in all markets, in europe it will only be available in Norway.
Isn't it supposed to be available in all of (or most of) Europe as the Opel Ampera-E? Various German e-mobility sources have published more than a few previews and stuff, would be surprising if it doesn't arrive here.
For now, the guvern program to subsidy the buy of an electric car in Germany is a big flop. Not because the money wasn't good, but we're used to jump in our Diesel Audi|BMW|Merz and drive 1000km until the next fill-up.
If all cars would be electric, the economy would stand still, while loading batteries. So, no.
As far as I know, Norway first, then Germany and some other european markets beginning in 2018. They lose money on every car, so it seems like they are limiting production and only delivering cars in California, where they get ZEV credits.
edit Opel also has a German preview page up on their website: http://www.opel.de/fahrzeuge/neuheiten-uebersicht/opel-amper...