#homeassistant folk, I have a question that I wonder if anyone had a good solution for!

I have 6x smart lights in my kitchen, each of which has power monitoring... But I rarely (if ever) use them individually and in fact I use a helper to group them into a single 'Kitchen Lights' entity that I can turn on and off as a group.

I had a eureka moment earlier of making a helper for energy and power to sum their individual values into a 'group' reading, that I could use in the energy dashboard to see the usage in one block rather than individual lights... But adding these helpers to energy gave me an error about missing values (last read, measurement, some things like that).

Does anyone have a nice solution for a 'grouping' of power monitoring devices that would work for this? Kitchen is just an example here but would love to group up other rooms where I do this too.

Thanks for any thoughts!