The energy dashboard does show nicely (and quite accurate) the energy costs for the whole day, and the energy usage per device. I’d like to have a per-device cost as well.
Right now I can see that my living room AC used 3.5kWh of energy today, but I can’t see what this has costed me. Or my EV charger. Or dishwasher. Or… well, you get the point.
The data is all there, because HA is using it already for the great sum-up of energy costs over the day.
I think solar or battery should be ignored for this. Solar panels generate energy for the entire house, not just a specific device. Having the cost per device is still a valuable information