Hi @GBoulvin 
Great, you’re catching up with us on this topic 
The « Teleinformation (Téléinformation) » device is really specific to the Lixee TIC normally, and normally it’s the Zigbee2mqtt integration that creates these features with the correct units 
In your case, in my opinion if the only thing that interests you is monitoring your electricity consumption, you should use the « Energy sensor / index » feature:
For these features:
If the value is not an index (if it’s just a kWh value that resets at each reading), you can use the « Energy sensor / Energy » feature.
Then, you’ll have to wait for this development:
Which will allow doing the calculation « Index → 30-minute consumption in kWh → Consumption in euros »