Thank you very much for your support and proposed wording.
Unfortunately I am not sure the proposed change is the best choice. The change in the first proposed sentence slightly changes the focus of the milestone and I do not believe the third sentence to be true.
There were several cities in Europe that had (some form of) electric street lighting prior to 1895. The city of Rijeka, for example, as early as 1884 for the premiere of Aida (needs verification). Rome, as another example, had a single-phase system (from the same manufacturer) before Šibenik was electrified.
The point of this milestone is to recognise the complete power system: its power generation, transmission (from the plant to the city), voltage transformation (six transformers in the city), distribution (within the city, after the voltage transformation), and consumption (street lamps).
Just a note: today’s modern power systems are multiphase alternating current systems (although with a different number of phases and different frequencies from the 1895 Krka-Šibenik system).