Template sensor measuring to low energy

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Ok, I see I read your first email wrong.

Let me start again. There are two ways you can create the increasing kWh-sensor you are looking for.

  1. Integrate the values of a sensor with the measurement unit = W, see this post Plugwise core and custom_component - #91 by bouwew

  2. Create a kWh sensor from the Wh sensor, as you tried to do originally, and then create yet another sensor that adds the values: add the new Wh-value to the sum of the previous Wh-values, every time a new hourly value is provided. This will give you the increasing kWh sensor that you need for HA Energy.