I have spent a lot of time in the solar/power/energy world of things. It’s the main reason I got into HA, to setup dashboard to display my off-grid system.
When the Energy dashboard came out I was intrigued. I had my own data and displays, but I wanted to see what HA built.
Well, after three or four goes at it I think I finally got it, but I have to say getting there was very confusing. Maybe I’m not doing a great job on searching the documentation, but it has been very unclear what exact type of sensors the Energy dashboard requires. There was very little information that I could find explaining it. I think if you have an out of the box provider for an energy integration maybe it’s easy, but for those of us with our own sensors it’s not very clear.
The home assistant doc on the energy dashboard does not link or explain that you need sensors that are doing a total_increasing type of sensor. It also needs to be in kwh. And for some reason you need to set an attribute last_reset: '1970-01-01T00:00:00+00:00'. Maybe it all makes sense now that I have it setup, but it was piecemeal for forum posts to get there.
Improving the getting started guide or the FTUX on setting up the dashboard page would be very helpful.