Not quite:
homeassistant:
customize:
sensor.tasmota_zaehler_leistung:
unit_of_measurement: "W"
device_class: power
state_class: measurement
sensor.tasmota_zaehler_einspeisung:
unit_of_measurement: "kWh"
device_class: energy
state_class: total_increasing
sensor.tasmota_zaehler_verbrauch:
unit_of_measurement: "kWh"
device_class: energy
state_class: total_increasing