Split a total_increasing sensor

I have a total_increasing sensor (kWh). I‘d like to create two template sensors of it.
One which counts, when the state of another sensor is 1 (on on), the other when it‘s 0 (or off). is that possible?

Yes. Feed your energy sensor to a utility meter with two tariffs. This will create two sensors.

Switch the tariff using an automation triggered by the state of your other sensor.

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ok, thanks! I’ll give it a try!