Using A Helper As A Reimann Sum Input Fails Due To Wrong Domain?

[tom_l]

Use a template sensor instead of the helper.

e.g.

template:
  - sensor:
      - name: My Device Power
        device_class: power
        state_class: measurement
        unit_of_measurement: W # or kW
        state: "{{ 42 if is_state('switch.my_switch','on') else 0 }}"

There’s also this that may be easier if you have a lot of these to do:

Powercalc - Virtual power sensors

In the last few weeks I have been working on a custom component to get virtual power sensors for your lights or other devices. It is stable enough right now to share it on this forum and make dedicated topic for it. The component provides multiple strategies to calculate estimated power consumption. One of the most interesting is the LUT method (using lookup tables). Some community members and me have taken measurements for all kind of different brightness/hue/saturation settings and their resp…