Smart meters have been a controversial topic for quite a while. Other countries began the roll out years ago. In Germany this takes way longer and there are still no certified products for the energy companies to install. The BSI (Bundesamt für Sicherheit in der Informationstechnologie) is responsible for certifying the smart meters. There are several smart meters up for certification as you can see on this side of the BSI.
The main reason for installing smart meters is the energy transformation to make the energy net more reliable for renewable energies. Therefore the EU has decided that every country should provide smart meters to their consumers. Thus the Bundesregierung passed the law for Digitalisierung der Energiewende in 2016. It requires 80% of all households to own a smart meter by 2020.