How to get a value from negative to positive

Hi, I just created my Energy Dashboard in HomeAssistant and all the Values that i want positive are negative. For example “Netzrückgabe-Gesamt” which mean metering power yield. I want this for example positivly that HomeAssistant can Calculate the money that I safe. If this value stays negativ it will show 0€

Create a template sensor.

how? I am very new in this and i only have a few sensor to choose…
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A template sensor might not fix this as it is part of statistics.
From a very high level uwith limited daya this seems correct though…wenn you get from the net it is positive and when you return it is negative so in the end it evens out.
Meaning you delivered net 5.01 which reduces so negative
Or am I missing the point?