Power usage during certain periods of the day

Configuration
1

I was hoping to get some help on this one, maybe even just to be pointed in the right direction.

My power company offers free power for 3 hours of the day between 9pm and 12am. I was hoping to create a value of the combined power consumption entities of several devices outside of those three hours. This way I could calculate the power consumed that could have been done for free such as running the dishwasher after 9pm if possible.

How would I go about this, I have seen the template integration referenced for a similar purpose but I’m just struggling getting my head around it. Maybe somebody has done this before but I cannot seem to find my specific use case online.

Any help would be greatly appreciated.

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Use energy sensors, not power. Use the Utility Meter tariff feature to measure how much energy you used during any period you want, see: How to use Utility Meter Tariffs to conditionally measure things

And yes you would need to sum the individual sensors with a template.

Share your energy sensor entity ids and we can help with this.

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