Not able to get kWh entity to Energy dashboard?

First, please reply as im 5 year old.

I do have kWh details from the shower

and kWh entity is this: sensor.adhs_energy
It don’t show up in Energy dashboard and perhaps issue is with as it don’t give as a kWh suffix.
How I can tackle that?

I tried to create sensor template:

sensor:

  - platform: template
    sensors: 
      energy_usage: 
        friendly_name: "Suihku"
        unit_of_measurement: "kWh"
        value_template: "{{ states('sensor.adhs_energy') | float }}"

It did work…kinda… but, only last shower were displayed on that sensor template, but still not possible to add it to the Energy Dashboard.

What I should do to meet these two requirements?

a) I can add it to the Energy dashboard
b) Historical data from that entity is available in there too? (As having some months backlog and not want to loose it.)
(c) Something what is needed and I missed it :slight_smile: )

...

      device_class: energy
      state_class: total_increasing
...