I guess “This is the way”. 
UPDATE: Apparently not…“The way”. I created a utility meter Energy Import UM in stead of the sensor. Teste with and without periodically_resetting: and with both values true and false . No effect what so ever.
energy_import_um:
source: sensor.energy_import
name: "Energy Import UM"
unique_id: energy_import_um
periodically_resetting: false
