How to fix statistics data (e.g. energy data)

[maxwroc (Maks)]

@nemezis336 The listing which I gave comes exactly from my configuration so I can confirm it works

@maxwroc

sensor:
  - platform: template
    sensors:
      energy_total:
        friendly_name: "Energy total"
        device_class: energy
        unit_of_measurement: kWh
        value_template: >
          {% if states('sensor.owl_energy_total') | float == 0 %}
           {{ states('sensor.energy_total') }}
          {% else %}
           {{ states('sensor.owl_energy_total') | float | multiply(0.001) | round(1) }}
          {% endif %}

Of course you need to change all the entity names in it.

The logic is pretty simple. If the owl_energy_total value is 0 then return energy_total (it’s own, same/unchanged) value, if not then provide the new value from owl_energy_total. Please note that I multiply there by 0.001 to convert Wh to kWh and at the end I round the output.