@m4nl5r Most meters have a way that you can get
readings off them, either digitally (HAN port, which is Ethernet plug, with PoE
for real time) or the German ones I know have an optical signal each used kWh
which can be read:
https://www.siio.de/powerfox-stromzaehler-auslesen-und-stromverbrauch-via-app-im-blick/