Adding static energy cost to energy dashboard

How can I add the static costs to the energy dashboard?

I made a template sensor with the static cost per month divided by the number of days in a month, that works fine.

The costs visible in the dashboard are accurate to the cent minus the static costs (I can verify the costs in the app from the energy company).

At this point I am stuck. Does anyone have an idea?

I’ve added screenshots from the app and from the energy dashboard so you can see what I mean. Stroomkosten + Variabele kosten matches up with the energy dashboard.


image