Calculate (sum) two entities to one sensor

Hi all,

Can some help me to calculate only the energy consumption if it is >0?
My template now is following:

- platform: template
   sensors:
     energie_totaal:
       friendly_name: Vermogen (totaal)
       unit_of_measurement: "kWh"
       value_template: '{{ states("sensor.youless_consumption_high" )| float + states("sensor.youless_consumption_low") | float }}'

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